Difference between revisions of "Minutes 7-25-2007"
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Participants: Daniel, Simon, Brian, Kim, Roger, Tim, Chuck, Fernando, Joe | Participants: Daniel, Simon, Brian, Kim, Roger, Tim, Chuck, Fernando, Joe | ||
− | Next Meeting: August | + | Next Meeting: August 8, 2007 |
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some of the open questions and areas where the design of the large-scale | some of the open questions and areas where the design of the large-scale | ||
prototype has been changed or reconsidered. This includes: | prototype has been changed or reconsidered. This includes: | ||
− | + | > the copper thickness on the STB and HVTB boards | |
− | + | > the physical size of the STB and HVTB boards | |
− | + | > the placement of the capacitors on the underside of the STB boards | |
− | + | > the placement of the daughter board connectors | |
− | + | > the distribution of power and ground on the STBs and HVTBs | |
− | + | > the HV connection scheme for the HVTBs | |
− | + | > the placement of the components on the STBs and HVTBs | |
− | + | > clearance issues with the FDC mounting rails | |
− | + | > the size of the dead zone | |
− | + | > the number of channels on the daughter boards for the STBs and cathodes | |
− | + | > the attachment of the ground planes | |
- The main issues for the short term are: | - The main issues for the short term are: | ||
− | + | > our plans to use 2 STBs and 2 HVTBs per wire plane. As Kim is | |
committed to other work for the next 3 weeks, Roger will prepare | committed to other work for the next 3 weeks, Roger will prepare | ||
and outline for the STBs and HVTBs that can be sent to a board | and outline for the STBs and HVTBs that can be sent to a board | ||
manufacturer to check on the size. | manufacturer to check on the size. | ||
− | + | > we decided that we will employ 24-channel readout for the daughter | |
boards on the cathode and the anodes. | boards on the cathode and the anodes. | ||
- Based on our discussions, DSC will update the list of answers to the | - Based on our discussions, DSC will update the list of answers to the | ||
Line 59: | Line 59: | ||
water until they are needed in the Hall. | water until they are needed in the Hall. | ||
- Other planning work that is ongoing includes: | - Other planning work that is ongoing includes: | ||
− | + | > update of the test plan | |
− | + | > preparation of a list for electronics and cables needs (we do not | |
want anything to fall between the cracks) | want anything to fall between the cracks) | ||
− | + | > Joe will obtain several isolation transformers for our electronics | |
to provide clean power | to provide clean power | ||
− | + | > Simon will talk to Doug about the construction of supports and | |
tie downs for the detectors inside and outside the magnet | tie downs for the detectors inside and outside the magnet | ||
− | + | > Simon will talk to Bill Gunning about modifications to our preamp | |
power distribution center for the 2735B cards | power distribution center for the 2735B cards | ||
− | + | > Gas for the test run has been ordered and is on sight. A bottle | |
of argon and CO2 needs to be moved to Hall B | of argon and CO2 needs to be moved to Hall B | ||
− | + | > Simon will put some voltage on the chambers (should be able to | |
put at least a few hundred volts on the sense busses to look for | put at least a few hundred volts on the sense busses to look for | ||
shorts and bussing problems | shorts and bussing problems | ||
− | + | > Simon will start work on reconnections of the electronics in | |
Hall B | Hall B | ||
− | + | > Simon will start work on preparing the software and analysis code | |
for the test run. He should have all of the ingredients and | for the test run. He should have all of the ingredients and | ||
subroutines already available, but just needs to start putting | subroutines already available, but just needs to start putting |
Latest revision as of 10:10, 4 August 2007
FDC Weekly Meeting
Date: July 25, 2007
Participants: Daniel, Simon, Brian, Kim, Roger, Tim, Chuck, Fernando, Joe
Next Meeting: August 8, 2007
Contents
Cathode Update
- Still no word from Optiprint or Sierra on producing the small-scale prototype or large-scale prototype boards. CCT Marketing is, to our understanding, proceeding on the manufacture of the boards for the small-scale prototype. We should expect them shortly. - Elke suggested at the morning Hall D meeting that we should pursue at least two companies to produce the boards for the small-scale prototype in order to compare the quality of the boards.
Prototype Design Planning
- DSC received a list of design questions from Kim and Chuck regarding the large-scale prototype design. DSC produced a list of answers to all questions that was distributed before the meeting. We discussed some of the open questions and areas where the design of the large-scale prototype has been changed or reconsidered. This includes: > the copper thickness on the STB and HVTB boards > the physical size of the STB and HVTB boards > the placement of the capacitors on the underside of the STB boards > the placement of the daughter board connectors > the distribution of power and ground on the STBs and HVTBs > the HV connection scheme for the HVTBs > the placement of the components on the STBs and HVTBs > clearance issues with the FDC mounting rails > the size of the dead zone > the number of channels on the daughter boards for the STBs and cathodes > the attachment of the ground planes - The main issues for the short term are: > our plans to use 2 STBs and 2 HVTBs per wire plane. As Kim is committed to other work for the next 3 weeks, Roger will prepare and outline for the STBs and HVTBs that can be sent to a board manufacturer to check on the size. > we decided that we will employ 24-channel readout for the daughter boards on the cathode and the anodes. - Based on our discussions, DSC will update the list of answers to the design questions and redistribute the list for comments.
Magnetic Field Tests
- Work continues on the preparation for the upcoming magnetic field test. On Monday, eight small area MWDCs arrived from IUCF. These chambers are 1-cm thick and roughly 45 x 25 cm**2. These chambers consist of 4 X chambers and 4 Y chambers. - Upon arrival, DSC and Simon carefully inspected each chamber. All were opened up and cleaned thoroughly. After connecting the chambers to nitrogen, it was discovered that there were a number of small leaks in the chambers and these were repaired. As of today, nitrogen is flowing through all chambers. If we cannot get sufficient through-put of gas, we will open up the problematic chambers and inspect and regrease the o-rings. - We plan on flowing nitrogen through the chambers to drive out any water until they are needed in the Hall. - Other planning work that is ongoing includes: > update of the test plan > preparation of a list for electronics and cables needs (we do not want anything to fall between the cracks) > Joe will obtain several isolation transformers for our electronics to provide clean power > Simon will talk to Doug about the construction of supports and tie downs for the detectors inside and outside the magnet > Simon will talk to Bill Gunning about modifications to our preamp power distribution center for the 2735B cards > Gas for the test run has been ordered and is on sight. A bottle of argon and CO2 needs to be moved to Hall B > Simon will put some voltage on the chambers (should be able to put at least a few hundred volts on the sense busses to look for shorts and bussing problems > Simon will start work on reconnections of the electronics in Hall B > Simon will start work on preparing the software and analysis code for the test run. He should have all of the ingredients and subroutines already available, but just needs to start putting things together
Simulations
- We had a meeting on Thursday with Dave and Elke to discuss the Monte Carlo results and planning for the FDCs. We finalized exactly what studies we want to perform and the priorities. The work that needs to be completed includes: > comparison of photon conversion probability in the inactive area (frames + cables) between the latest FDC design to the FDC design presented in the chamber review. This will require another version of the geometry to include the stripped readout cables, the composite wire frames and spacers, better modeling of the electronics, and a reorganization of the layers in the CDC. > rates per strip and wire for the latest FDC review. > momentum resolution vs. momentum and angle for the latest FDC design. - David Lawrence will be spear-heading the work in consultation with Richard Jones and the IU folks (Mijailo and Matt).
Work List
- The FDC short-term work list has been posted on the FDC web site (see http://www.jlab.org/Hall-D/detector/fdc/). This is continually being updated and DSC welcomes any feedback or comments from the group.
Minutes prepared by Daniel. Send any comments or corrections along.