578
edits
Changes
Jump to navigation
Jump to search
Line 13:
Line 13: − + Line 55:
Line 55: − + + + − *'''Check that all electronics are off before opening the dark box! Have a grad student or lab technician remove the pre-amp board after opening the dark box.''' Carefully unscrew the main dark box opening and dock the popsicle stick into place by tightening the two screws underneath the popsicle stick to secure it into place. The wood has been depressed in the place where the popsicle stick should be. '''Do not modify the position of the pulsar at any point during the loading process!''' − [[File:LH-FiberQA_Darkbox.jpg|thumb|center]] − + + Line 69:
Line 70: − + − [[File:LH-FiberQA_PulserPower.jpg|thumb|center]]+ − [[File:LH-FiberQA_Electronics.jpg|thumb|center]]+ − + − + − +
→Procedure
==Procedure==
==Procedure==
[[File:LH-FiberTesting-CleanRoom.jpg|thumb|right|upright|The ventilated clean room with a workbench, the dark box, and all necessary electronics.]]
[[File:LH-FiberTesting-CleanRoom.jpg|thumb|right|upright|The ventilated clean room with a workbench, the dark box, and all necessary electronics.]]
[[File:LH-FiberQA_Darkbox.jpg|thumb|left|The darkbox open and empty. The black plastic is pulled back and suspended with wires so you can see both sides: the pulser side and the chimney side.]]
*Before taking any fibers out of the dark room, open the [https://docs.google.com/a/uconn.edu/spreadsheets/d/1T4NUSQO_keT0QckCx4rWlbMW7Yot4vb-Z1eqrM1l94k|Fiber QA] Google Doc. Each bundle has a separate tab which you can view the alignments required for each run.
*Before taking any fibers out of the dark room, open the [https://docs.google.com/a/uconn.edu/spreadsheets/d/1T4NUSQO_keT0QckCx4rWlbMW7Yot4vb-Z1eqrM1l94k|Fiber QA] Google Doc. Each bundle has a separate tab which you can view the alignments required for each run.
*After you are sure that the fibers are properly separated and flush with each other, make sure the wires and clamp is tight so that no fibers can change position.
*After you are sure that the fibers are properly separated and flush with each other, make sure the wires and clamp is tight so that no fibers can change position.
[[File:LH-FiberQA_Preamp.jpg|thumb|center]]
[[File:LH-FiberQA_Preamp.jpg|thumb|right|Preamp board 00001. The 15 SiPMs are across the top. Only trained lab technicians should handle the preamp boards!]]
*'''Check that all electronics are off before opening the dark box! Have a grad student or lab technician remove the preamp board after opening the dark box.''' Carefully unscrew the main dark box opening and dock the popsicle stick into place by tightening the two screws underneath the popsicle stick to secure it into place. The wood has been depressed in the place where the popsicle stick should be. '''Do not modify the position of the pulsar at any point during the loading process!'''
*Cover the fibers with the black cloth. Be careful not to cover the path from the mirror to the off-set bundle!
*Cover the fibers with the black cloth. Be careful not to cover the path from the mirror to the off-set bundle!
*Let the black plastic divider down and Velcro the top opening shut so no light passes from the pulsar side to the SiPM side of the dark box.
*Let the black plastic divider down and Velcro the top opening shut so no light passes from the pulsar side to the SiPM side of the dark box.
*Guide the fiber ends over the edge and using the Google Document, place the fibers into the chimney in the correct order.
[[File:LH-FiberQA_FibersChimney.jpg|thumb|left|Marco and Suki carefully placing the fibers into their respective chimneys.]]
*Guide the fiber ends over the edge and using the Google Document, place the fibers into the chimney in the correct order. Channel 1 on each chimney is the channel closest to the backplane.
**Check that each fiber is flush against the chimney edge using a straight piece of metal, followed by a check via touch, and finally, visually inspect using the light/mirror.
**Check that each fiber is flush against the chimney edge using a straight piece of metal, followed by a check via touch, and finally, visually inspect using the light/mirror.
**If any fibers are not flush against the edge, re-do the previous step.
**If any fibers are not flush against the edge, re-do the previous step.
*'''A grad student or lab technician''' must put the SiPM board back into place. Do not just use your thumbs to push in the pre-amp boards as it may bend the backplane. Gently slide the board into place and screw in the chimney support until it is flush against the chimney.
*'''A grad student or lab technician''' must put the SiPM board back into place. Do not just use your thumbs to push in the pre-amp boards as it may bend the backplane. Gently slide the board into place and screw in the chimney support until it is flush against the chimney.
*Close the main dark box opening and ensure that it is light sealed.
*Close the main dark box opening and ensure that it is light sealed.
*Turn on the power supply for the pulser and the op-amp first. Check that the voltages remain constant at 1.5 V and -10 V. Next turn on the power supply for the pre-amps and backplane electronics.
{|style="margin: 0 auto;"
|[[File:LH-FiberQA_PulserPower.jpg|thumb|center|A view of the power supply powering the pulser and op-amp.]]
|[[File:LH-FiberQA_Electronics.jpg|thumb|center|A view of the power supplies for the backplane and control board.]]
*Turn on the power supply for the pulser and the op-amp first. Check that the voltages remain constant at 1.5 V and 10 V. Next turn on the power supply for the pre-amps and backplane electronics.
|[[File:LH-FiberQA_Backplane.jpg|thumb|center|A view of the backplane.]]
|}
*Start the run from the gryphn.uconn.edu web address.
*Start the run from the gryphn.uconn.edu web address.
**It takes 7-8 minutes from the time the run begins to complete. If the run does not finish in this time, something has gone wrong. Notify a grad student.
**It takes 7-8 minutes from the time the run begins to complete. If the run does not finish in this time, something has gone wrong. Notify a grad student.