SSO 40 inch WFI
Contents
1. Exposure Options number of exposures 5 WFI e Click on Options click on Show Regions Window Check that region 1 is highlighted with a blue box and that the X Y Width and Height settings are set for the full CCD X offset XO 0 Y offset YO 0 Width 8392 Height 8272 e Set the Overscan Columns to 0 This Overscan option is for the 2 3m DBS Astromed controllers The WFI SDSU controllers have overscan and bias regions preset e Click on Dismiss Click on Expose Bias frames should display between 2 500 4 500 counts The standard deviation of bias frames can be calculated by using GIT Load the bias frame into ximtool using the left mouse button drag a box onto the image click on the Statistics Icon Bar Graph the standard deviation should be between 2 and 3 Clear the box by right clicking on the box and choosing destroy FLAT FIELDS Sky Flat preparation These should be taken about 15 to 30 minutes after sunset or before sunrise The key to this is to be about 20 away from the zenith in the direction opposite to where the Sun is setting or rising Sky Flats tend to be better than Dome Flats As a general guide e Inthe late afternoon slew the telescope in R A away from the sunset to the Sidereal Time 1 hour In the early morning slew to the Sidereal Time 1 hour In summer slew in Declination to 20 In winter slew in Dec to 40 in spring and autumn slew2. 3 After Windows starts click on the MaxIm DL icon Scroll down in the MaxIm DL window so that you can click on Guide CCD s WEI In the Cicada Tools menu click on Start GSFind this will open the Guide Star Finder this shows an outline of the main and guiding CCDs relative to GSC stars Enter the RA and Dec of your target in the Field box enter the appropriate Equinox Set the Position Angle degrees to 90 set the magnitude limits Click on Actions click on Read GSC Use the left mouse button to drag the green CCD mosaic so that you place one of the available guiding CCD s on top of a suitable guide star The R A and Dec of the main CCD array centre will be shown in the Detector box To obtain data on any star on the chart place the cursor onto the star and press the spacebar The RA Dec and Magnitude of the star will be highlighted in the Objects Found window On the Autoguider computer click on the Guide CCDs WFI bar at the bottom of the screen or on the WFI Guider Selector icon Click on the guiding CCD which you placed on top of the guide star in GSFind Click on the MaxIm DL Autoguider Image bar to return to the autoguider screen Using the E T S Motion then Track menu slew the telescope to the R A and Dec position as shown in the Guide Star Finder Detector box Click on Open Shutter in Cicada this allows light to fall onto the Autoguiding CCD without actually takin
3. If upper shutter doesn t close it needs to be driven fully open onto the external springs first LN2 leaking from filling tube Tighten the various nuts on the tube call technical support LN2 leaking from camera dewar at high ZD angles Remove lens cap before filling camera dewar Do dome flats before filling camera dewar LN2 small tank pressure low Small tank needs filling from large tank call technical support Pressurize small tank with air line by connecting air line to top of LN2 tank SDSU controllers feel hot Water cooler has failed Check it and restart it if necessary Dewar vacuum rising or focal plane temperature not holding Pump dewar call technical support Ver 19 01 02
4. kill all Cicada processes that are running by typing at the username monsoon prompt ps ef grep cicada and then the kill 1 or kill process number Remove the core file with rm core XIMTOOL N When Ximtool reads out North is to the right East is down DATA ARCHIVING e The WFI data area is data monsoon1 cicada username e Data are archived from MONSOON to the DDS4 DAT tape drive The DDS4 drive will take DDS2 DDS3 and DDS4 tapes Data files on MONSOON can be archived in TAR format by using the following example procedure e Move the cursor to a blank area of the new screen and click the right mouse button e Click the left mouse button on Programs drag to the right to open a new Shell Tool window e Type cd data monsoonI cicada username data directory lt Enter gt e Type Is this will list the files in the directory e Type allocate mtl lt Enter gt N B mtl is compressed mode mt0 is uncompressed mode e Type mt rew to rewind the tape to the start e Type tar cv fits shift8 dot fits lt Enter gt N B if this is a tape with image files already on it type etar instead of tar e fusing etar when asked if you wish to use the next file number press Y lt Enter gt e When the prompt returns type mt rewind lt Enter gt e Type deallocate mtl lt Enter gt 8 WFI e Press the Eject button on the tape drive to eject the tape e tarcv fits copies all fits files tar xv r
5. this probably means that the NESLAB has failed Check the temperature of the controller heat sinks occasionally touch them IRAF WFI produces mosaiced images In iraf you need to specify the extension number in the filename as below If you haven t used IRAF before refer to http msowww anu edu au computing lun lun35 lun35 html 15 Set the terminal type as xgterm at the prompt after mkiraf and edit login cl or loginuser cl to set set stdimage imt4096 setimtype fits Then ximtool amp brings up an ximtool to display images in cl starts iraf And display filename CCD 1 imcopy filename CCD xmin xmax ymin ymax outfile fits imexamine filename CCDI xmin xmax ymin ymaxl image operations v does plot from two cursor input positions r gives radial profile of star fwhm etc a gives mag and fwhm etc for star no plot Even for a single CCD readout or a small region readout you need the extension filename 1 Use the mscred package in iraf to reduce mosaiced images ds9 saotng are nice alternative display tools ds9 can handle mosaics TROUBLESHOOTING If things go wrong here are some possible causes Solutions are hopefully in these notes or somewhere in the sources listed below First follow the suggestions above to keep Cicada as stable as possible SOURCES OF INFORMATION kS The 40 Inch Telescope WFT DIY Manua this document 40 Inch Telescope Observer s Technical Guide http Iwww
6. To correct the situation in Cicada under the Actions menu click on Initialise CCD Hardware SHUTTER PRIMING At large easterly hour angles gt 4hrs the camera shutter can fail to reset You can recognise this by the star trails on an image trails on CCDs 1 4 trail up on CCDs they 5 8 trail down In addition there will be a ramp in the signal across the CCDs Another clue to a failed shutter can be gained by listening to the shutter operation There should be a loud CL LICK on open and close with the control room door open A failed shutter sounds different a woosy fainter click due to the fact that only one of the two shutter blades is operating To fix a shutter that fails to reset you will need to prime the shutter manually Priming the shutter e Transfer telescope control to the dome e Move the telescope to 45deg dec HA 2 5 hrs East e Raise the floor to the level of step 5 on the concrete stairs 10 WFI e On the Wide Field Imager Exposure Controller locate panel E2448 i e the large electronics rack mounted above WFI on the eastern side of the 40 inch optical tube e Switch the top toggle switch the Prime Switch from Nor Normal to the Prime position e Turn to face WFI at the left of the filter box you will see a small rectangular inspection port labeled Priming Rod Access Cover Remove this cover e To the top right of the filter box you will see a knurled knob labeled Priming Rod Unscrew the
7. exit cicada and restart e Doing too much processor or memory intensive stuff on monsoon during readout In particular avoid e Beginning or ending a tar command during readout during exposing is OK e Doing much in Netscape e Copying images and other operations in iraf e Leaving the little graphics keystrokes window open during readout e Changing regions in the regions window during readout During readout you CAN do these e Change filter change exposures change duration GIT Graphic amp Imaging Tool GIT presently has a problem with displaying mosaiced images It displays them OK on readout but it cannot set sensible scaling parameters to allow you to calculate star profiles get single line plots etc The Ximtool window just goes all black or white and displays a single value To overcome these limitations do the following e Untoggle NumLock e Select Options Start private ximtool e Select Options Preferences In Preferences e Select category General e Untoggle Mosaic MEF files in Cicada mode 13 e Enter the MEF extension list i e a list of which CCDs you want available for loading into the private ximtool Note that if you are only using CCD numbers 1 2 7 8 say their MEF image extension numbers will be 1 2 3 4 i e CCD number and extension number are different things e Set Maximum Cicada images if necessary e The list of extensions you have requested will appear in the image list
8. to about 30 Dome Flat preparation N B Take dome flats before filling the dewar to avoid LN spillage e Inthe E T S Configuration Configure menu set the Dome Control to Manual e Enter the dome ensure that the console Auto Slew Set knob is switched to Slew Set e Using the Declination Slew S button lower the telescope to about 78 beyond the SCP Telescope ZD 70 as shown on the ETS monitor e Rotate the dome to an Azimuth of 70 as shown on the ETS monitor or align the red and black mark on the dome with the marks on the wall behind the dome console e Rotate the dome so that the dome flat screen and telescope are in alignment e Partially open the upper shutter to faintly illuminate the screen turn off all dome lights e Ifyou need to use dome lights use the tungsten lights only Cicada settings for Sky Dome flats e In Options Show Regions Window use the X Y Width and Height settings for the full CCD Set x offset 0 y offset 0 Width 8392 Height 8272 e Object Name Sky_Flat or Dome_Flat Exposure Type o Flat e Start taking Flats with Exposure Options set to o Display Only e Set the Overscan Columns to 0 This Overscan option is for the 2 3m DBS Astromed controllers The WFI SDSU controllers have overscan and bias regions preset e For Dome Flats start with an exposure duration of between 10 25 seconds 4 WFI Read the counts in Xim
9. 3 5 5 5 electrons To obtain Gain amp RON follow the procedure in the 40 Inch Telescope Observer s Technical Guide The SDSU controllers read out the entire array in 55 seconds The full array image is 140Mb in size one CCD is 17 5Mb The data monsoon1 disk on Monsoon holds almost 100Gb about 4 8 days data A DDS3 125m tape holds fractionally over 18Gb compressed i e use allocate mtl 11 WFI Writing to tape takes 11 5 min Gb 3 5 hours per full tape don t get caught on you last night SAVE EARLY The plate scale of the WFT is 0 375 arcsec per pixel 25 arcsec per mm or 2 5 pixels per sec of arc e g ifa star image is 5 pixels across then the seeing is 2 arcsec The field of view covers 52 arcminutes with the diagonal being 1 2 degrees The values displayed at the lower right corner of the CICADA_ximtool window show The x axis pixel position count the y axis pixel position count and the image pixel intensity count A general guide to the quality of the seeing can be made by zooming in on a star and counting the star s pixel width 5 pixels 2 arcsecond seeing OR Plate Scale X Star FWHM 0 375 X 2 Guide CCDs Pixel size 10 microns CCD Array 320 X 240 pixels Plate Scale 0 25 arcsec pixel or 4 pixels sec of arc Field of View 80 arcsec X 60 arcsec Main WFI CCDs Pixel size 15 microns CCD Array 8192 X 8192 Each CCD 2048 X 4096 plus 20 30 arcsec gaps Plate Scale 0 375 arcsec
10. 40NIGH TELESCOPE WA DIY MANUAL Prepared by John Shobbrook amp Bob Shobbrook Please email amendments or suggestions to sbrook mso anu edu au RUNNING CICADA Log On to Monsoon under your own account name Open a new Xterm or Shelltool window at the prompt type cicada amp lt Enter gt this will open the basic Cicada v3 2 5 tool bar On the Cicada tool bar click on Start Observing Click on WFI Enter the observers name check 0 Automatically archive raw data Click on OK When the Cicada Control window opens click on Close Shutter Click on SDSU click on Readout Mode select Fast Click on Instrument Controls click on Filter F_40 Initialise the filter wheel by clicking on Get Filter Position Close the window by clicking on Dismiss At the start of each new observing run NOT each night click on Tools click on Start Teldisk click on Clear Disk click on OK Clear the disk this will clear the previous observer s data from the hard disk and create a new directory for your data click on Quit Teldisk Check that the Output Image Directory name is correctly set by clicking on Options click on Preferences in Directory enter data monsoon1 cicada username Insert an appropriate entry in Prefix to e g ccd wfi Whilst in Options Preferences select n n n Show messages window at startup Reset number of exposures to 1 after each sequence of gt 1 exposures Toggle binning wh
11. d the dome console Lower the floor raise the telescope to the vertical using the N slew button Set the Auto Slew Set switch to Auto FILLING THE DEWAR N B Take Dome Flats before filling the dewar to avoid LN spillage In Cicada click on SDSU click on Show Temperatures Record the pre fill dewar temperature as shown in the FOCALPL Actual column record the dewar vacuum as displayed on the WFI In the Dome remove the lens cap BEFORE filling the dewar to prevent LN spillage Press the large red STOP button to the right of the dome console Fill the dewar from the LN bottle If the pressure is below 7 connect the orange spiral airline attached to the pier to the LN bottle Vent plug to reduce the filling time Press the Emergency Stop Reset button illuminated beside the STOP button In Cicada click on SDSU click on Read Temperatures Record the post fill dewar temperature and vacuum Fully lower the observatory floor Turn off all light within the dome The incandescent light switch is to the right of the balcony door the fluorescent light switch is on the dome below the shutter The red lights are controlled from the dome console N B If you need to use the shutter windscreen the raise and lower control buttons are located on the dome beneath the shutter opening BIAS FRAMES In the Cicada control window set Object Name BIAS Exposure Type o BIAS o Save and Display
12. en switching from no save to save Flush count 1 Screen Numbers GIT 0 Pipeline 0 Gsfind 0 Ximtool 1 The left monitor is 1 the right monitor is 0 Focusing Parameters Steps 5 First focus position 0 001 Position step 1 000 Star profile radius pixels 10 Click on Apply At the top of the Preferences Window click on General click on Image Display and Scaling The Display Options setting are Scaling Algorithm Adaptive Median Sample size 1000 of image to readout before scaling 25 Contrast adjustment 0 50 Num SDs tolerance before rescaling 0 10 Click on Apply if you have adjusted these settings click on OK WFI In the Cicada control window click on Tools Click on Start GIT this will open the CICADA Ximtool window and the Graphic amp Imaging Tool Window Click on the icon towards the right of the ximtool window to open the Ximtool Control window TELESCOPE SETUP Delay this step if you are taking Dome Flats Open the dome shutters At the dome console ensure that the Dome Lights Dome Telescope and Tracking pushbuttons are switched ON upper button pressed IN leave the key switch on Set the Auto Slew Set rotary switch on the dome console to Slew Set Lower the telescope using the Declination Slew S button to about 70 beyond the SCP raise the floor level remove the lens cap and store it on the bracket behin
13. etrieves data off a tape tar tv shows what is on the tape SHUTDOWN TELESCOPE MOTION e Slew the telescope to the current Sidereal Time and a Declination of about 31 00 00 e When the telescope is in position at the E T S click on Motion click on Halt AUTOGUIDER e Click on Stop leave the software running CICADA e Leave the software up and running There is no option for Continuous Flush etc IN THE DOME TELESCOPE e Set the Auto Slew Set rotary switch on the dome console to Slew Set e Lower the telescope using the Declination Slew S button raise the floor level replace the lens cap e Close the dome shutters e Turn on the dome white lights e Lower the floor raise the telescope to the vertical using the N Declination Slew button e In Cicada click on SDSU click on Read Temperatures e Record the pre fill dewar temperature as shown in the FOCALPL Actual column record the dewar vacuum as displayed on the WFI e Fill the dewar from the LN bottle If the pressure is below 7 connect the airline to reduce the filling time e In Cicada click on SDSU click on Read Temperatures e Record the post fill dewar temperature and vacuum e Fill in the Log Sheet on the dome console shelf At the completion of your observing run complete the MSSSO Online Comment file ACCESSING THE MSSSO ONLINE COMMENT FILE Observer comment and fault files exist for logging alterations to the instrumen
14. g an exposure In Maxim DL click on the Guide Tab Set the Exposure time to 7 seconds enter the declination of the guide star degrees only into the Declination Box Click on the Expose button click on Start Click the mouse cursor on the star as displayed in the Autoguider Image window Click on the Track button in the Guide Tab Click on Start Autoguiding will commence 7 WFI DATA TAKING e In Cicada click on Open Shutter to pass an image to the autoguider e Set Exposure Type to 0 Object o Save and Display set the exposure time e Set the Overscan Columns to 0 This Overscan option is for the 2 3m DBS Astromed controllers The WFI SDSU controllers have overscan and bias regions preset e Click on Close Shutter Note There is a Shutter Priming Delay e The shutter takes a few seconds to prime so wait 8 10 seconds after closing the shutter e g after acquiring the guide star before exposing e When the shutter is primed and the star image in the autoguider fades click on Expose e When the image has finished reading out click on Open Shutter to re acquire the guide star Check images as they readout in Ximtool if the star images are streaky then you may have to re boot Cicada to solve the problem Ifthe autoguider image fails to reappear during the exposure ABORT the exposure reset the Run No and repeat the Data Taking procedure If you have trouble re booting Cicada
15. mso anu edu au observing 40in DirectIm 40in http msowww anu edu aulcomputing cicada cicada The WFI web pages Other hardcopy manuals in the Control Room http msowww anu edu aulobserving tc_ manual KS e e te t Troubleshooting in the Control Room My object doesn t appear on Ximtool after readout Cloud Dome is blocking view Dome shutter blocking view Camera shutter failure I see streaks on my image Camera shutter failure Cicada failure re boot Cicada 16 Initialise hardware a last resort I can t analyse images star profiles stats etc in Ximtool The image just goes to a single value Start a private ximtool in GIT Cicada has hung Exit Cicada cleanup restart Cicada Stop processor memory intensive processes Avoid using abort Don t use pause Lots of Red Error Windows Can t Stop Them Kill Cicada from the command line cleanup and restart I can t point the telescope more accurately than 20arcsec The telescope only points to within about 20aresec But use buttons on round focus guide set paddle Use set or guide speeds With practice this becomes fairly accurate to within a few pixels Ximtool menus are inactive Untoggle NumLock I can t change brightness contrast using left mouse scrolling Untoggle NumLock New images keep loading into my private Ximtool Turn off automatic loading of images by toggling the cicada mode button under the GIT Options Prefe
16. pixel or 25 arcsec mm or 2 5 pixels sec of arc Field of View 52 X 52 arcmin Diagonal 1 2 degrees DEWAR VACUUM The dewar vacuum rises about 1E 07 per day The vacuum is probably Ok up to about 1E 04 LN2 hold time is about 12 hours CICADA GIT amp Ximtool General Strategies to deal with CICADA Cicada has a tendency to hang usually during readout and sometimes for no obvious reason even if you are doing none of the bad things listed below The only remedy is to restart it To do this e Inthe Observers Window menu select actions quit observing window 12 e Inthe CICADA menu select Start Observing Exit_ CICADA From the command line enter e ps ef grep cicada Look for cicada processes Ignore svc Kill others with Kill 9 process number ot Cicada _ cleanup p 0 Cicada_cleanup p 1 Cicada_cleanup p 2 Cicada _cleanup p 3 Restart using cicada amp In general restarting solves Cicada problems but it s a pain so Follow these next practices for relatively trouble free operation e Pause DON T use pause This crashes Cicada so badly you could need to logout to restart e NumLock Keep NumLock untoggled It interferes with ximtool and GIT operation In particular it prevents you using right mouse scrolling to change brightness contrast and inactivates the ximtool menus e Initialise Hardware advice is to use this as a last resort Avoid e Using ABORT You ll often then need to
17. r mm or 2 5 pixels per sec of arc e g ifa star image is 5 pixels across then the seeing is 2 arcsec The field of view covers 52 arcminutes with the diagonal being 1 2 degrees You can also monitor focus as you work by keeping an eye on the images The 40 inch has astigmatism such that images are elongated at about 45 degrees from NW to SE when the focus setting is too high and from NE to SW when the focus is too low You can use this astigmatism to focus the telescope If the star images are elongated NW SE gt focus is too high Press the Out button LED readout decreases NE SW gt focus is too low Press the In button LED readout increases Typical focus values are in the range from 31 65 31 88 Using the main WFI CCD mosaic e Using the control room hand paddle slew the telescope to the South of the chosen focus field then back North to cancel gear backlash stop with the Declination seconds readout on 00 use the Guide option for fine control e Using the hand paddle cancel focus backlash by increasing the focus readout with the IN FOCUS button until you are beyond your start position Press the OUT focus button to come back down to your start position say 32 40 e Set Exposure Type to o Object and o Display Only e Set Exposure Options to Exposures 7 Duration 70 seconds No pre flush and o No readout e Click on Flush to clear the p
18. rences General menu This is supposed to work but sometimes doesn t My star images are elliptical Focus the telescope Focussing is difficult Try focusing from same direction to take up backlash There is bleeding on stars amp bias has changed Restart cicada I can t see my guide star while setting up guiding Open the shutter I can t find the Guide CCDs WFI chooser window Scroll down in the m40slave window Autoguiding doesn t seem to be working accurately Set the declination correctly on the guide tab in the Maxim CCD window Troubleshooting in the Dome The telescope won t obey the Auto setting of the dome Auto Slew Set rotary switch The dome floor is not in the fully lowered position 17 The dome doesn t follow telescope Check that the dome position encoder high on the western wall is flashing its green LEDs at you If not restart ETS select file shutdown then startup at the prompt Put the dome in the auto mode on ETS select configuration configure Telescope pointing is bad Calibrate the pointing refer to page 4 Reset the time Phone 1 1194 Telescope doesn t move Ensure floor is fully down Fault in ETS Call technical support Telescope moves unexpectedly by itself Press large red STOP button on dome console or on electronics rack in control room Shutters don t open or close Press the shutter stop button and try again Listen for the relays clicking downstairs
19. revious image from the CCD array then click on Expose e Using the N paddle button set to Guide move the telescope by 20 of arc watch Dec change on the E T S monitor declination will decrease as the telescope moves North e Lower the focus readout by 0 05 by using the OUT paddle button record the focus position e Take asecond 10 second duration exposure by clicking on Expose e Using the N paddle button move the telescope by another 20 of arc e Lower the focus readout by 0 05 by using the OUT paddle button record focus position e Take another 10 second exposure 6 WFI REPEAT the telescope move focus and expose steps until you have taken 6 exposures at differing focus positions To clearly identify between the first and last image in the subsequent readout you could also slight shift the last image in R A For the final exposure CANCEL the o NO READOUT option in Exposure Options Examine the displayed image the exposure sequence will be from right to left if you used the N button to move the telescope note which focus position provides the best image reset the focus position accordingly repeat the focus sequence if necessary Jf the image is streaked re boot Cicada AUTOGUIDING If the autoguider PC has to be restarted 1 When asked for a password just click Cancel 2 The VNC server is m40slave 0 Password is in the back of the 40 CCD Temp Log Book
20. robably need a hardware initialisation from the action menu If such error messages are reported when cicada is restarted you may need two hwinits Do the hwinit immediately after restarting cicada COMPUTERS Mosaic inrack runs controllers Monsoon on desk runs Cicada Murky in office is a bit slow Data is stored on monsoon in data monsoon1 cicada username SDSU Controller Master controls CCD s 1 2 3 4 the Slave controller runs CCD s 5 6 7 8 To transfer telescope control to the Dome console e At the ETS PC select Configuration configure Toggle Dome Control to manual e Enter the dome e At the dome console switch the rotary Guide Slew Set knob to Slew Set e Move telescope dome and floor as necessary e Press the large red STOP button if filling dewar or stopping observing To transfer telescope control to the Control Room Press the emergency stop reset button illuminated beside the STOP button Ensure floor is fully down At the dome console switch the rotary Guide Slew Set knob to Auto Go to the control room e On the ETS PC select Configuration configure e Toggle Dome Control to automatic Telescope Tracking Telescope RA tracking sometimes drops out Just redo the tracking command in the ETS computer to restart SDSU Cooling The SDSU controllers are cooled by the NESLAB cooler downstairs in corridor through library on the left Ifthe controllers get hot
21. rod and insert it into the small round hole at the bottom right of the Priming Rod Access plate e Gently push in the rod to manually prime the shutter e When the shutter is primed withdraw the rod replace the cover and rod in its holder e Reset the Prime Switch to Nor Normal You can check that the shutter is primed by switching the Display toggle switch to On the Ready LED should glow once checked switch the Display toggle switch to Off To test that the shutter is working Toggle the Mode switch to Manual Toggle the Display switch to On Toggle the Shutter switch Open AND then to Closed to test the shutter Don t forget to wait 8 seconds for the shutter to reset after closing Return all four switches UP before resuming observing N B For normal operation all four toggle switches on panel E2448 are in the UP position Prime Nor Mode Auto Shutter Close Display Off GENERAL At the Equator 4 sec of R A 1 arcmin in Dec or I min of R A 15 arcmin in Dec To offset for non equatorial declinations Declination in degrees X Cos X Offset in Arcmin WFI chips Eight 2k x 2k 2048x4096 CCDs in a 2x4 mosaic Each sees 13 x26 arcmin making a 52 x52 field Pixels are 15 micron giving 0 375 arcsec pixel on the 40 inch f 8 Gaps between the CCDs are 20 30 arcseconds Gains are 1 5 2 1 electrons ADU RONSs are
22. t and for user comments WFI users are required to record their experiences in this file for the benefit of others Access to the file either to read it or add your comment is available through the MSSSO home page at http msowww anu edu au observing AUTOGUIDER SETTINGS via the GUIDE TAB X Axis Cal Time 1 Backlash 0 Y Axis Cal Time 3 Backlash 0 Manual Calibration X Speed 10 Y Speed 4 83 Check boxes Enable X Axis Enable Y Axis Aggressiveness 4 Control Via Camera Relay 9 WFI Display Scaling Focal Length 2000 Display Mode Pixels Check Delta Exposure Settings Binning 1 X Offset 0 Y Offset 0 Width 320 Height 240 More Autoguider settings Guiding Minimum move X 0 10 Minimum move Y 0 10 Maximum move X 3 00 Maximum move Y 3 00 Delay after correction sec 0 50 Move Commands Maximum Slew X 5 00 Maximum Slew Y 10 00 Delay after commands 0 10 INITIALISING CCD HARDWARE If half of the main CCD array in Ximtool fails to display enter the dome and check that the correct LED s at the rear of the Master and Slave processors are illuminated The pattern of LED s should be G Green X Out O Orange Slave Master O G QaAaxAaQQQ Oona The Master and Slave processors are mounted one each side of the WFI dewar The LED s which are covered with black electrical tape are located on the northern Control Room side of the controllers Possibly the Slave 1 processor will have shut down
23. tool and adjust the exposure duration or light entering the dome until you obtain a value of about 30 000 When the correct number of counts have been reached set the Exposure Options to Save and Display Click on Expose take at least 5 flat fields with each filter in use With Sky Flats offset the telescope between exposures by about 2 arcmin by switching the control room paddle to Set and pressing the N button for about one second Aim for brightness counts in the vicinity of 10 000 30 000 DARK FRAMES Dark current is small and dark frames are generally not necessary POINTING THE TELESCOPE CALIBRATING THE POINTING Ensure that the Auto Slew Set rotary knob on the dome console is set to Auto and that the dome floor is fully lowered Using the E T S Configuration Configure menu set the Dome Control to Auto Click on the Motion drop down menu click on Track Enter the Name Optional R A Dec and Epoch Optional of the target object Click on Track Take an exposure to ensure that the target has been centred Click on Configuration Calibrate Pointing enter the R A and Dec of the target click on Calibrate click on Close FOCUSING THE TELESCOPE Using the WFI Automated Focusing sequence In Cicada under the Actions drop down menu click on Do_Focus_ Sequence Follow the prompts or refer to p 17 of the Cicada User s Manual To highlight a star drag across it with the left mo
24. use button then click the right moost icon in Cicada Read Marked Region from Image Tool Move the focus using the In and Out buttons on the round paddle by 0 03 0 05 units between each image starting at about 31 70 as displayed on the small red LED focus readout box Using the Maxim DL autoguider CCD In the Focus Tab check the Continuous box then click the Reset button Ensure that the Subframe is set to Left 0 Top 0 Width 320 Height 240 Set an appropriate exposure time e g 10 seconds In the Focus Tab click on the Start Focus button After the first exposure click the Abort button Click the Auto button this will place a box around the brightest star in the field Click on Start Focus exposures will continuously cycle Click on the Inspect tab Focus the telescope using the In and Out buttons on the control room hand paddle 5 WFI N B The In button increases the focus position value as displayed on the control room focus position digital display the Out button decreases the value The Inspect Tab will display the information needed to focus the telescope including the FWHM in pixels and the amplitude Max window of the brightest pixel Best focus is obtained with the FWHM value as small as possible and the Max value as large as possible The narrower the 3 D isometric plot the better the focus The plate scale of the WFI is 0 375 arcsec per pixel 25 arcsec pe
25. window Click one and it loads into the private ximtool Now you can get star profiles cross sections stats etc But when the next image is read out it will automatically be loaded into the private ximtool But avoid leaving the little graphics keystrokes window open during readout or GIT will crash out XIMTOOL N When Ximtool reads out North is to the right East is down 1 pixel 0 375arcsec E To move a star Nin Dec offset on ETS is NEGATIVE To Sin Dec s POSITIVE To Win RA POSITIVE To Ein RA s NEGATIVE Screen Preferences for GIT and Ximtool Select the monitor for these in Options Preferences General Common practice puts GIT and Ximtool on screen 1 Other Binning If you change the binning it may not change back again when you reset it to 1 x 1 even though the regions window shows itas 1 x 1 WFI Watch the file sizes should be 271440 blocks full 8xCCDs Bleeding If readout shows bleeding on brighter stars on some CCDs and bias changes restart cicada Wrong Frame Size If there is an error message about ximtool having the wrong frame size check that there is not an old cicada ximtool process running ps ef grep cicada will show it Many Red Error Windows 14 If several red error windows appear from cicada and restarting is impossible or doesn t work try logging out and back in That can fix it If the error messages involve SDSU then they p
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