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Line 31: − − [[File:LH-FiberTesting-PopStickClamp.jpg|thumb|center|upright|The popsicle stick with clamp and wires to hold the fibers in place. We're working on a different model which would use mylar to hold the fibers down.]] Line 44:
Line 41: − − [[File:LH-FiberTesting-PaperSpacers.jpg|thumb|center|upright|A view of 15 flush fibers separated with paper spacers between each row and column.]] Line 63:
Line 58: − {|style="margin: 0 auto;"+ − | [[File:LH-FiberTesting-Pulsar1.jpg|thumb|center|upright|Image of the fibers, mirror and pulsar from the main opening of the dark box.]] − | [[File:LH-FiberTesting-Pulsar2.jpg|thumb|center|upright|Image of the fibers, mirror and pulsar from along the fibers.]] − |} Line 73:
Line 65: − − [[File:LH-FiberTesting-InsideDarkBox.jpg|thumb|center|upright|View of the fibers from the main opening of the dark box. Black plastic separates the scintillating fiber end and pulsar from the chimneys and SciPMs.]] − −
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==Fiber QA Troubleshooting==
==Fiber QA Troubleshooting==
We made our testing darkbox from scratch so we had to configure electronics and troubleshoot issues with the Fiber QA Procedures. You can read the details of these effors on the [[Fiber QA Troubleshooting]] page, but they are summarized below:
We made our testing darkbox from scratch so we had to configure electronics and troubleshoot issues with the Fiber QA Procedures. You can read the details of these effors on the [[Fiber QA Troubleshooting]] page, but they are summarized below:
Fibers will be issued a new name after QA in the form of a bundle number, followed by a colon and then a fiber number. The diagram below shows how the fibers are positioned as viewed within the fibers, looking from the light guides out through the SciFis. [[File:LH-FiberTesting-QANomenclature.png|275px|center]]
Fibers will be issued a new name after QA in the form of a bundle number, followed by a colon and then a fiber number. The diagram below shows how the fibers are positioned as viewed within the fibers, looking from the light guides out through the SciFis. [[File:LH-FiberTesting-QANomenclature.png|275px|center]]
*Once the fibers are in the order they belong, begin placing them in the wide clamp on the popsicle stick.
*Once the fibers are in the order they belong, begin placing them in the wide clamp on the popsicle stick.
**This step will take two people. One person should place the fibers, while the other should hold them in place once they are placed. This way fibers will stay in their appropriate positions.
**This step will take two people. One person should place the fibers, while the other should hold them in place once they are placed. This way fibers will stay in their appropriate positions.
*Loosen the clamp and move it down over the fibers. Tighten it enough so they do not slip but not too tight as to make it impossible to add paper spacers in the near future. Also use the wires that are going through the holes in the popsicle stick to your advantage. Tightening them around the fibers will do a good job of keeping the fibers in place.
*Loosen the clamp and move it down over the fibers. Tighten it enough so they do not slip but not too tight as to make it impossible to add paper spacers in the near future. Also use the wires that are going through the holes in the popsicle stick to your advantage. Tightening them around the fibers will do a good job of keeping the fibers in place.
*Next, put strips of paper between each of the 3 columns. These strips of paper do not need to go far back, just far enough that they will not block any light from the pulser getting to the fiber face.
*Next, put strips of paper between each of the 3 columns. These strips of paper do not need to go far back, just far enough that they will not block any light from the pulser getting to the fiber face.
*The next step is to put spacers in the middle of the s-bend in the fibers for both columns and rows.
*The next step is to put spacers in the middle of the s-bend in the fibers for both columns and rows.
*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.
*Guide the fiber ends over the edge and using the Google Document, place the fibers into the chimney in the correct order.
*'''Have a lab technician check the fibers at this step.''' The fibers cannot be too far into the chimneys or else they will damage the SiPMs when the board is replaced.
*'''Have a lab technician check the fibers at this step.''' The fibers cannot be too far into the chimneys or else they will damage the SiPMs when the board is replaced.
*'''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.