The MPIA-UKIRT-Project Software User's Guide - Max
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1. 2 Tip tilt correction Tip tilt ON and Tip tilt Focus ON One should aim at using a Loop frequency of at least 50 Hz and to have an exposure time of at least the readout time This can be checked by roughly estimating the cycle time as the reciprocal of the Loop frequency and compare it to the Exposure time At 50 70Hz the exposure time is usually larger than the readout time As all images are stored when using Store Corrected the images are displayed at the end of the sequence The display style is defined by AstroCam They call it tile image because the images are displayed like tiles on the wall Use the mouse to check whether the number of counts is all right and the stars look nice i e round As the tip tilt correction is on in this mode the star should be spread out equally over the four central pixels If you have counts between 2000 and 50000 with the background being set to 1000 things are fine If the counts are too high choosing a lower binning factor reduces the flux per pixel At the end of the Store Corrected sequence two graphs with two curves each pop up The first shows the center positions in CCD pixel units that should all be around zero the second shows the Piezo commanded positions that have to be between 0 0001 and 0 0001 If the latter curve is a straight line at 0 0001 or 0 0001 that means that the corresponding Piezo has reached the limit of its throw The star has to be repositioned in its subarray by usin2. Full FOV and start Movie in astroCam tcl When the image display pops up click with the middle mouse button on a star move the pointer to the new position inside the image display and click the middle mouse button again The star will move the last clicked position The MPIA UKIRT Project Software User s Guide Document Revision 1
3. sensor line The MPIA UKIRT Project Software User s Guide 9 Chapter 2 Tip tilt correction Snapshots of becgui dl and mcugui dl 6 Snapshots of becgui dl and mcugui dl 10 BRER AS 1 1 yess 1314 A 10 0 3 5 18 The MPIA UKIRT Project Software User s Guide 3p iQ in dag Lora rug mac uei La 0 0 3 0 mE rui ab eL a4 Document Revision 1 Chapter 3 Glossary 1 CCD parameters The region of the CCD that is read out can be defined by Full Frame Full FOV Subarray and Custom subarray The numbers on the left X origin Y origin X width Y width Custom subarray width and Binning give the detailed information In Full Frame Full FOV and Subarray mode only Binning can be adjusted In Custom subarray all parameters can be adjusted manually Full Frame is the total visible area of the CCD Full FOV is the part of the CCD where CHARM produces an image Subarray is the default subarray for fastest readout Custom subarray can be defined by the user either by typing the coordinates in the GUI or by using the left mouse button in Acquisition mode 2 Gain Gain is the factor in of the measured image center position that is applied to the Piezos 100 means that the Piezos attempt to put the measured center position to the center of the subarray 80 means that the image center after correction is 20 of the measured value Reducing the gain to values sma
4. tcl program you have to terminate the image display program draw by typing q for quit inside the image display window 3 Nothing works MPIA Release 1 0 You can verify all start up phases by carefully watching the VME console while it is booting If you have to reboot the VME system do it by pressing the RED reset button on the CPU board A soft reset X doesn t work Parts of the VME start up procedure are logged to files which you should inspect in case of problems If you cannot start the programs described above your login account is probably not setup properly e g no dm command in your PATH or the TCL LIBRARY and TK LIBRARY environment variables point to the wrong TCL TK version The MPIA UKIRT Project Software User s Guide 5 Chapter 1 Introduction Snapshot of astroCam tcl 4 Snapshot of astroCam tcl File Options Help CCD type EEV P86000 432 x 578 pixels _ RefreshCCD Actual region parameters Acquisition eh Movie Tip tilt ON Tip tilt Focus ON StoreCorrected Store Uncorrected Store Focus Corrected Store Focus Uncorrected 6 The MPIA UKIRT Project Software User s Guide Document Revision 1 Chapter 2 Tip tilt correction 1 Adjusting and verifying scale factors MPIA Release 1 0 Tip tilt correction can only work when the mapping between the Tip tilt tracker wavefront sensor and the correction mirror UKIRT s new s
5. The MPIA UKIRT Project Software User s Guide Draft Stefan Hippler Max Planck Institut f r Astronomie Heidelberg Germany July 1996 MPIA Release 1 0 MPIA Release 1 0 The MPIA UKIRT Project Software User s Guide Max Planck Institut f r Astronomie K nigstuhl 17 69117 Heidelberg Germany http www mpia hd mpg de Draft Document Revision 1 Chapter 1 Introduction 1 Overview Controlling and operating the MPIA UKIRT Project hardware was made as easy as possible Four graphical user interfaces GUI s provide the user with almost everything that is necessary to operate and maintain the hardware Further maintenance commands and additional information is provided through the VME VxWorks console The three PI electronics boxes Bottom End Controller bec Mirror Control Unit mcu and Hexapod Controller hexc also have serial RS232 ports that allow stand alone operation and maintenance 2 First steps The beginning Switching on and login procedure 1 Switch on the Tip tilt sensor controller AstroCam 4201 electronics 2 Switch on the Bottom End Controller 3 Switch on the Mirror Control Unit 4 Switch on the VME VxWorks system which is connected with the hardware described above Nn Login to your UNIX workstation for login account information ask local staff 6 Give cd SWROOT and then type astroCam tcl amp in any xterm window to open the main GUI MPIA Release 1 0 The MPIA UKIRT Pro
6. econdary mirror is correct The Tip tilt tracker s CCD geometry is 432 pixels x by 578 pixels y In order to correct an x or y displacement with the Secondary there are two variables globals dxscale and globals dyscale defined in aui c A third variable globals dzscale is used for focus correction Calibrating the system is easy 1 Select Full FOV in astroCam tcl position a star Movie mode into the FOV center 2 Open the VME VxWorks console window or use the real VxWorks console 3 Give cd work on the VxWorks console substitute work by the directory name from where you have started astroCam tcl e g echo SWROOT 4 Type sp mcuGetScale on the VxWorks console 5 There are now 6 files in your UNIX directory WROOT named mcuGS00 fits mcuGS0l fits mcuGS02 fits mcuGS03 fits mcuGS04 fits and mcuGS05 fits which correspond to the following Secondary tip tilt positions in u rad and v rad coordinates a mcuGS00 fits gt 0 0 mcuGS01 fits gt 1E 4 1E 4 mcuGS02 fits gt 1E 4 TE 4 mcuGS03 fits gt 1E 4 1E 4 mcuGS04 fits gt 1E 4 1E 4 f mcuGS05 fits gt 0 0 6 Measure the center position of the star in each mirror position e g use saoimage to load the fits images and write down the star s center coordinates ona c The MPIA UKIRT Project Software User s Guide 7 Chapter 2 Tip tilt correction Finding the tip tilt guide star 7 Calculate the difference between the first x cent
7. el If the last action doesn t help try switching off and on again the mcu electronics Initialize goto reference mark the Sky Shutter by pressing the Init button below the Sky Shutter label The following messages can appear on the right side of the Close button 1 notRef Sky Shutter is not referenced initialized 2 ref ing Sky Shutter is currently initializing 3 atRef Sky Shutter is at reference mark The MPIA UKIRT Project Software User s Guide Document Revision 1 Chapter 1 Introduction Nothing works Don t forget to quit the image display program draw with q 4 opening Sky Shutter is currently opening 5 closing Sky Shutter is currently closing 6 opened Sky Shutter is open 7 closed Sky Shutter is closed 8 atPlim Sky Shutter is at its positive limit 9 atNlim Sky Shutter is at its negative limit 10 motnErr A motion error occurred 11 badPos Sky Shutter is neither in the opened nor in the closed area Tip tilt sensor check Move the mouse pointer into the astroCam tcl window click on the Full Frame button and then on the Acquisition button After approx 10s a window appears on the screen displaying the just taken image You can move the mouse pointer into the image window and the actual x and y coordinates as well as the pixel intensity are displayed inside the image window The number displayed in the image window title area gives the actual Zoom factor e g Z 1 In order to continue working with the astroCam
8. er coordinate and the second between the second and the third and so forth Sum up the five difference values and divide them by 4 Write this number x down Repeat this procedure for the y center coordinates but divide by 8 in order to calculate lt y gt 8 Set globals dxscale to 1 E 4 lt y gt and globals dyscale to 1 E 4 x Units are rad per CCD pixel Remember that the x axis on the CCD corresponds to the v angle of the Secondary and the y axis to the u angle Since x and y are pretty equal you can average them lt x gt lt y gt 2 and set globals dxscale and globals dyscale equal 1 E 4 divided by lt x gt lt y gt 2 9 Modify aui c and compile it with make inside the aui directory 10 reboot the VME VxWorks system load the new aui routine 2 Finding the tip tilt guide star Find your object with the science instrument Start Movie in Full FOV mode and look for a good guide star Move the guide star into the default subarray box by clicking on the guide star with the right mouse button this works only when using draw as the default image display program so don t check Use saoimage in the Options menu The default subarray is in the upper left corner This is the optimal position for minimizing the readout time of the subarray If the star cannot be moved into that box define a new subarray by clicking on the star with the left mouse button Now typing q inside the image window automatically invokes the Custo
9. ess the Goto ref mark button The Moving and Seeking reference indicators for all axes should switch from off to on After some minutes all stages should be initialized Reference found and Target reached on Current pos and Target pos 0 all other indicators should be off Connection ok should be the standard connection status Connection down for a short period of time approx 1s is nothing you should worry about Connection down for longer than 5s means that you really have no connection to the Bottom End Controller Mirror Control Unit subsystem Move the mouse pointer inside the mcugui dl window and press the Initialise button below the Hexapod label You don t need to initialize the Hexapod if the field on the right side of the Initialize button is empty e g there is no blinking NOT READY text As with the other dl windows Connection ok is mandatory otherwise you cannot communicate with the hardware After having pressed the Initialize button the green light right to the Position button starts blinking and the blinking NOT READY appears whether it was already visible or not The three fields below the Piezos label should all be on If one of these Mirror controls is off and you cannot switch them on by pressing the corresponding button on the left side there s a good chance that some of the required PZT voltages see MPIC PZT Power Supply are out of their operational range In this case press the MCU button below the System reset lab
10. g the middle mouse button in Movie mode One exits from this display by moving the mouse into the xterm window that was opened with the graphs and hitting the return key 4 Tip tilt ON and Tip tilt Focus ON One can now guide on that star by clicking on Tip tilt ON To select tip tilt and focus correction click Tip tilt Focus ON The real time image center coordinates are displayed in another salmon colored GUI auigui dl that can be activated either by typing aui or by clicking on aui in one of the other dl windows In the Tip tilt ON mode the gain can be adjusted on line simply by moving the Gain slider in astroCam tcl The effect is quite obvious A gain of 100 should be fine when the PZT drives are operated in closed loop mode Overcritical gain gt 100 and undercritical gain 100 operational modes can improve tip tilt correction 5 Tip tilt correction and chopping MPIA Release 1 0 Click on the Enabled on button below the Chop modes label in the mcugui dl window To select a chop angle and a chop throw move change the sliders below the Chopping label Find and select a star as described above You have to re select a star as described above after modifying any of the chop parameters Press Tip tilt ON or Tip tilt Focus ON Please note that whenever you change the Chopping Angle the Camera angle check the becgui dl window changes so that a chop throw remains aligned with the orientation of a CCD tip tilt
11. give cd ASTROMED 42gci then type vx42gci new and finally type aui b016link setor 2 How can I log save to a file all these Info verbose mode 1 or Debug verbose mode 2 messages when I activate Verbose mode 3 Info and Debug messages in one of the dl windows Open an xterm window on your workstation From this xterm window open a telnet session to the VME VxWorks system Hold down the lt Ctrl gt key and the left mouse button and select Log to File from the Main Options menu that pops up The AstroCam system does not boot How can I check the transputer communica tion Type the command inmosCheck on the VME VxWorks console If the output doesn t look like the one below you probably have a hardware or cabling problem Using bxvi00 inmosCheck 3 0 Part rate Mb Bt LinkO Linkli Link2 Link3 0 T16 20 1 75 1 I 1 0 HOST iius ae s 1 T2 20 1 20 0 0 0 vs ers avv How can I log save to a file mcu log status information of the mcu subsystem Open the VME VxWorks console and give mcuSysStatusAll 1 gt mcu log How can I log save to a file bec log status information of the bec subsystem Open the VME V xWorks console and give becSysStatusA11 0 1 gt bec log The MPIA UKIRT Project Software User s Guide 15 Chapter 4 What to do when Questions and answers about using the MPIA UKIRT Project software 16 Is there an easy way to move a star on the Tip tilt sensor via the crosshead Select
12. ject Software User s Guide 3 Chapter 1 Introduction First steps First initializations and operational checkouts 7 Type bec in any xterm window to open the bec GUI 8 Open the mcu and aui GUI s from the Windows menu of the bec GUI 9 Open a telnet connection to the VME VxWorks system During normal operation there is no information of interest in the VxWorks console window so it can be closed iconized Let this window open until you have finished First initializations and operational checkouts AstroCam subsystem Click the Refresh CCD button within the Setup area of the astroCam tcl GUI On the VxWorks console you should see now numbers from 1 13 indicating the different stages of a hardware init hwinit procedure running inside the AstroCam controller transputer The System status changes from idle to busy while the Refresh CCD procedure is being processed The Command status changes from ok to sending command and depending on the result back to either acceptTimeout command Timeout or ok If everything looks fine you can be sure that the communication between your workstation and the VME VxWorks EPICS system as well as the communication between the VME VxWorks EPICS system and the AstroCam controller transputer link are ok If this basic test fails see chapter What to do when at the end of this manual Bottom End Controller subsystem Move the mouse pointer inside the becgui dl window select axis 0 all axes and pr
13. l typing q with the cursor in the image Dark takes an image but the shutter remains closed This allows you to check the background Tip tilt ON or Tip tilt Focus ON starts the tip tilt correction and Focus correction until clicking on Stop LOOP At the end the last subarray is displayed to make sure that guiding was done on a star and not on the sky background If the system starts oscillating the Gain can be set to smaller values In the auigui dl window the centroids are displayed on line Store Focus Corrected takes a number of images specified in Frames to store and displays the centroid position as a graph gnuplot and after hitting the return key with the cursor in the underlying window the voltages sent to the Piezo as a graph Hitting the return key again exits from this graph mode and the image displaying all the subarrays as a tile image Here one can check the intensity in the single images Store Focus Uncorrected does the same as above except it doesn t correct and it doesn t display the voltages Here one can check in the tile image e g whether the star leaves the subarray The MPIA UKIRT Project Software User s Guide Document Revision 1 Chapter 3 Glossary Other business 6 Other business The exposure time is set with exposure time The loop frequency the reciprocal of the sum of exposure time and readout time and overhead is calculated automatically according to the position and the size of the
14. ller than 100 provides some sort of damping and increasing the gain to values greater than 10096 provides overcritical operation MPIA Release 1 0 The MPIA UKIRT Project Software User s Guide 11 Chapter 3 Glossary System status and Command status 3 System status and Command status Both provide information on these statii Messages are idle and busy and sending command ok acceptTimeout and commandTimeout Refresh CCD starts blinking after 60 minutes Clicking on that button reinitializes the CCD This takes about 20 seconds and removes all the charge that has accumulated in open shutter modes It s a good idea to do it from time to time but by no means vital 5 Imaging modes 12 There are Acquisition Dark Movie Tip tilt ON Tip tilt Focus ON Store Corrected Store Uncorrected Store Focus Corrected and Store Focus Uncorrected Acquisition takes one image and displays it In this mode as well as in Movie mode the shutter is opened and closed and the middle and the right mouse button can be used to move the star on the CCD In addition to these features one can define a custom subarray in Acquisition mode by clicking with the left mouse button on the desired center position of the subarray Then the Custom subarry is invoked automatically after exiting from the Acquisition mode by typing q inside the image Movie is essentially the same as Acquisition except that it refreshes the image as fast as it can unti
15. m subarray mode in astroCam tcl The Custom subarray width can be adjusted by moving the slider Using Movie again reads out exactly the newly defined subarray If the default subarray is fine clock on Subarray to define this part of the chip for the next imaging action 3 Checking the readout parameters To achieve a high loop frequency the shutter of the CCD camera has to stay open and the camera is operated in a kind of frame transfer mode see section Imaging modes in chapter Glossary As the exposure is slightly different in the shutter modes like Movie and in the frame transfer modes one has to take images with Store Corrected before starting the final Tip tilt ON for unlimited correction The minimum shutter open time is about 25ms even though a smaller Exposure time was chosen Store Corrected store a given number of images with tip tilt correction on or Store Focus Corrected same as Store Corrected plus focus correction reads out a limited number of frames that has to be specified in Frames to store The gt gt indicates that by clicking on the text Frames to store a popup menu gives a selection of numbers that can be chosen Once Store Corrected is started it cannot be stopped Be careful not to choose I second exposure time and 4096 frames that keeps the system busy for more than an hour Then the only cure is resetting the VxWorks system The MPIA UKIRT Project Software User s Guide Document Revision 1 Chapter
16. subarray Vice versa one can choose the loop frequency and the exposure time will be set accordingly One should always make sure that the read out time is at least 4 5 times shorter than the exposure time Changing the binning changes the readout time and thus the loop frequency is adjusted accordingly 7 Data files MPIA Release 1 0 Each Imaging except Movie Tip tilt Focus ON command creates a FITS data file with a filename defined in the Options gt Save menu Each data file consists of a prefix and a 4 digit number e g work tracker data Aug96 test0000 In your working directory SWROOT a symbolic link LAST fits points to the last image taken Movie creates a FITS data file movie fits in WROOT Tip tilt Focus ON creates a FITS data file doTipTilt fits in WROOT All Store Un corrected commands create an additional table file ready to plot with gnuplot e g gnuplot storeAllCorr gplor gnuplot storeAllUncorr gpl The table file name is created by adding centroid4 to the FITS data file name The MPIA UKIRT Project Software User s Guide 13 Chapter 3 Glossary Snapshot of auigui dl 8 Snapshot of auigui dl 14 The MPIA UKIRT Project Software User s Guide Document Revision 1 Chapter 4 What to do when 1 Questions and answers about using the MPIA UKIRT Project software MPIA Release 1 0 How can I reboot the AstroCam camera Open the VME Vx Works console or window and
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