MICE Beamstop – User's Guide
Contents
1. there is a specific reason for concern attempt to raise the beamstop even further even though it cannot move using the local hand control see below it should be possible hear the hydraulic power pack energise 3 Preparation for shift 3 1 Warm Start The moving beamstop must be left in the fully raised state If it has been left partly or fully open seek advice from the Operations Manager in the first instance Check that the UP limit indicator lamp on the control panel in the Rack Room is lit Get Beamstop Enable key and two small padlock keys from MOM 3 1 1 Energise power pack o Insert and rotate the enable key in the local keyswitch on the DSA wall fig 7 o Turn the red stop toggle on the hand control clockwise and pull it out o Push the white up button to make sure the beamstop is all the way up It should be possible hear the hydraulic power pack energise o When sure push red stop toggle back in The beamstop now cannot be moved o Turn key anti clockwise and remove it from keyswitch This process builds up the hydraulic pressure in the system and ensures that the scissor table is not pushing on the mechanical beamstop frame 3 1 2 Remove Mechanical Beamstop Frame The mechanical beamstop is a metal frame that prevents motion of the scissor table It is secured to the base of the table assembly by the main pair of 17 mm bolts fig 4 A second pair of studs carries a crossbar that is held in place by a2. turning the beamstop enable key in the appropriate keyswitch The local enable key switch is mounted on the DSA wall while the remote enable keyswitch is on the control panel The beamstop must be left in the fully raised state This can be confirmed visually the edges of the black tape should line up A webcam is provided to view this from outside the MICE Hall Beamstop status is also indicated on the Beamline Summary Controls amp Monitoring display on the Alarm Handler and PPS mimic The state of the beamstop is monitored by the PPS which may take action when the beamstop is opened or closed consult the PPS User Guide for details However the beamstop is not controlled by the PPS it can be opened or closed at any time so procedural controls regarding pre requisites and operation must be followed Beamstop User Guide v 1 1 29 J anuary 2015 Page 2 2 Installation Cold Starting The moving beamstop must be left in the fully raised state If it has been left partly or fully open seek advice from the Operations Manager in the first instance Check that the scissor lift area is clear and free from any obstructions Check that the mechanical beamstop spanner 17 mm and tommy bar are present right Power to the beamstop power packs is provided from the adjacent three phase socket ensure this is switched on The UP limit indicator lamp on the control panel in the Rack Room will illuminate If
3. MICE Beamstop User s Guide J J Nebrensky Brunel University Uxbridge UB8 3PH UK G Barber Imperial College London SW7 2AZ UK 1 Introduction This document describes operation and basic troubleshooting of the MICE moving beamstop Pre requisites for beamstop operation are NOT covered The MICE moving beamstop assembly fig 1 consists of a cast concrete and steel barrier faced with borated polyethylene that covers an opening in the DSA wall such that radiation within the DSA is blocked from entering the main part of the MICE Hall A movable plug can be lowered from the casing exposing the aperture by which the muon beam enters the Hall The moving beamstop is supported on a scissor lifting table powered by two independent hydraulic power packs To prevent accidental operation or exposure of the Hall after a power failure the motion of the scissor table can be blocked by a removable metal frame secured by padlocks sometimes referred to as the mechanical beamstop Hydraulic power packs Closure indicator tape Q7 Limit switches Scissor lift Figure 1 MICE Moving Beamstop Beamstop User Guide v 1 1 29 J anuary 2015 Page 1 Figure 2 Moving Beamstop Hand Control Unit Figure 3 Moving Beamstop Remote Control Panel The beamstop can be operated either locally using a hand control unit fig 2 or remotely from the control panel in the Rack Room rack DAQ O1 fig 3 This is decided by
4. g 6 they are the long silver coloured bars along each edge which stop the beamstop movement if they are pushed upward i e towards the concrete plug Beamstop User Guide v 1 1 29 J anuary 2015 Page 7 8 Troubleshooting If no lamps are lit on the remote control panel but the beamstop is fully raised or lowered then the power is off check the 3 phase mains plug and switch fig 7 Hydraulic Power Packs Hydraulic selection lever Electrical selector switch Hand Control Unit Local Enable Keyswitch 3 phase power socket and switch Scissor lift table Figure 7 Beamstop Local Controls and Power If the beamstop doesn t move when a control button is pushed o Is the stop toggle on the hand control unit still pushed in o Has the beamstop enable key been turned in the appropriate key switch o Is the power on The plug must be in the socket on and the electrical selector switch on either position 1 or position 2 not on 0 o Is the hydraulic power pack energising It should be audible from the local control area If not ask the BLOC to switch to the backup power pack If the beamstop won t lower o Ensure the space around the lifting table is clear from obstructions and the proximity sensors are free o Try to drive upward for a moment Beamstop User Guide v 1 1 29 J anuary 2015 Page 8 The proximity sensors around the table edge will prevent the beamstop from being lowered further until the trip ha
5. me having the second person pull it out the side towards Q7 is easiest Once finished turn the red stop toggle on the hand control clockwise and pull it out otherwise remote operation is not possible The beamstop is now free to move and can be operated subject to inserting the beamstop enable key into the appropriate keyswitch 3 2 Function Test The only real test is to open and close the beamstop this would normally be left until the appropriate point in the shift 4 Running Instructions 4 1 To lower the beamstop remotely O O If there are people in the Hall ensure everyone is clear of the moving parts Check that the beamstop is in the fully raised position the UP lamp on the remote control panel in the Rack Room fig 3 should be lit Insert the beamstop enable key into the keyswitch on the remote control panel and turn it Briefly push the MOVE UP button to clear any internal interlocks then press and hold MOVE DOWN The UP lamp will go out as the beamstop is no longer fully raised and the Alarm Handler will trigger if it is running After about 30s the beamstop will reach the lowered position and the DOWN lamp will illuminate Confirm on webcam or C amp M display that the beamstop has lowered as expected Acknowledge Alarm Handler if necessary Beamstop User Guide v 1 1 29 J anuary 2015 Page 5 4 2 To raise the beamstop remotely O If there are people in the Hall en
6. nt frame ensure it 1s sitting level on the table base Replace the main bolts making sure to use the correct holes leaving them loose Replace the crossbar studs in the correct holes It can be useful to rattle the frame to get the holes to line up Tighten the main bolts with the spanner and then do up the studs leaving the top hole aligned perpendicular to the MICE beam see fig 5 Beamstop User Guide v 1 1 29 J anuary 2015 Page 6 o Replace the collars and the crossbar with the padlock holes on the lower side and replace the padlocks with the lock bodies towards you Return beamstop keys to MOM 6 Shutdown Prior to leaving the MICE Hall in the Free Access state the beamstop must be fully raised and the mechanical restraint frame put in place Power to the beamstop is left on permanently 7 Emergency Shutdown If you need to shut off the system because it has a fault o Remove beamstop enable key from any keyswitch o Shut off power to beamstop system at the 3 phase power socket fig 7 If you need to stop it while it 1s in motion o Release control button o If using hand control push the red stop toggle o Remove beamstop enable key from any keyswitch o Trip the scissor lift proximity sensors fig 6 Figure 6 The silver bars are the proximity switches around the scissor lift table platform The scissor lift is fitted with proximity switches around the lower edge of the moving table fi
7. pair of padlocks to prevent unauthorised removal of the restraint fig 5 Beamstop User Guide v 1 1 29 J anuary 2015 Page 3 Crossbar Mechanical beamstop frame Main bolts Figure 4 Mechanical beamstop frame and layout Note that the crossbar is mounted deeper in at the far right hand end Stud and collar Figure 5 Mechanical beamstop crossbar As the mechanical beamstop is disassembled the parts should be carefully set aside such that it is clear which side they came from Keep all parts from the left together and separate from the parts from the right They are not the same and are not interchangeable The niches in the support frame are convenient for storage Beamstop User Guide v 1 1 29 J anuary 2015 Page 4 All components including washers etc must be accounted for They may become a hazard when the superconducting magnets are active As you will be working with your hands beneath a heavy movable object a second person should be present Remove the mechanical beamstop as follows O O O Unlock and remove the padlocks from the crossbar Remove the crossbar note that it has a top and bottom side Remove the studs and collars use the Allen key provided as a tommy bar to turn the stud by the hole used for the padlock Note which mounting holes the studs were in Remove the main bolts using the box spanner provided Note which mounting holes the bolts were in Lift out the restraining fra
8. s been reset this is done simply by raising the table momentarily which can be done remotely Thus you should check that the area is clear first rather than repeatedly driving the beamstop down on to the same obstruction If problems persist contact the Hall Manager and or Geoff Barber 8 1 How to Switch to the Backup Power Pack BLOC clk op Settings for Power Pack 1 Settings for Power Pack 2 Figure 8 Switching the hydraulic power pack In normal running mode the electrical selector switch will be set to 1 and the hydraulic selector lever will be at 12 o clock To switch to the backup power pack the electrical switch needs to be set to 2 and the hydraulic lever put to 6 o clock 9 Documented Procedures Operation of beamstop is covered by MICE RA MS templates Manual Handling 009 Beamstop User Guide v 1 1 29 J anuary 2015 Page 9
9. sure everyone is clear of the moving parts Press and hold the MOVE UP button on the remote control panel The DOWN lamp will go out as the beamstop is no longer fully lowered and the Alarm Handler will trigger if running After about 30s the beamstop will reach the raised position and the UP lamp will illuminate Confirm on webcam or C amp M display that the beamstop has closed as expected Acknowledge Alarm Handler if necessary Remove the beamstop enable key from the keyswitch on the remote control panel 5 End of Shift The moving beamstop must be left in the fully raised state If it has been left partly or fully open seek advice from the Operations Manager in the first instance At the end of a shift you should close the beamstop section 4 2 and return keys to the MOM Prior to leaving the MICE Hall in Free Access you should also replace the restraint frame 5 1 Replace Mechanical Beamstop Frame Replacing the restraint frame is the reverse of the process of removal section 3 1 2 All components including washers etc must be accounted for They may become a hazard when the superconducting magnets are active As you will be working with your hands beneath a heavy movable object a second person should be present O O Raise the beamstop as per section 4 2 or by hand if needed Push in the red stop toggle on the hand control Remove beamstop enable key from keyswitch Replace the restrai
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