FDC Weekly Meeting
Date: June 11, 2009
Participants: Daniel, Beni, Bill, Eugene, Brian, Simon, Mark I., Roger, Fernando, Rich
Next Meeting: June 18, 2009 @ 1:30 p.m.
General Construction Updates
- The design drawings for the fiber-reinforced gusset rings have been submitted to the machine shop. - The pins for the assembly jig on which the detector stack will be constructed are now being made in the machine shop. - Bill will take on the preparation for a stack assembly document. A draft will be prepared before assembly of the full-scale prototype and then fleshed out during the process with relevant photographs taken. - Cable preparations: * The LV cables have arrived and will be tested in the near future. * The parts n' pieces for the HV cables are now all in hand and construction and testing will begin over the next several weeks. * The signal cables and connectors are in hand and Mark and Brian will begin construction as they have time. - Bill has found an o-ring material that he was satisfied with and an order has been placed. Delivery is expected before the end of this month. - We are now having short daily meeting to review the work on the full-scale prototype construction and to ensure that any snags or problems that come up are immediately addressed. - Eugene is working to identify clean room space for FDC construction. He has talked recently with Dennis Skopik who will work to define the assigned space.
Wire Frame Update
- Armen has completed nearly all of the soldering work on the four wire frames. In fact everything is done except for attachment of the high voltage pigtails (just for safety). The only snafu was that the locating holes for the preamp card connectors were too small and had to be enlarged slightly. Fernando passed this information on to Kim to update the design drawings. - Fernando's summer student Rich Rines from UMass will be performing a series of HV tests on the completed wire frames to ensure that there are no problems. We will start getting updates next week. - We need to have a dedicated meeting to design what the schedule for work on the Phase 3 wire winding will be. The highest priority for work scheduling will be doing work on upgrades of the wire winding facility. This includes a better strongback design, the design and construction of precision combs, modification to the wire winding table, and a list of other items with the system. Stay tuned, more to come. - We are pushing hard to begin wire frame construction early next year and begin wire winding before the end of 2010. Hopefully this can all procede. We are now working to complete the simulation studies with Simon to determine if we want to offset neighboring wire layers. More to come in the upcoming months. - The wire frame construction document is located at: /u/group/halld/Engineering/PRELIMINARY DOCUMENTS. We will include the information on the wire electroplating process shortly. - Bill is now designing the jig for the wire electroplating operation and it will be ready for submission to the shop at some point in the future. We will make a decision shortly if/when we will electroplate the wires for the full-scale prototype. - Brian received the SEM scans for our wire from the W&M folks. He will generate a final QA report with photos and test results for all wires in the next several weeks.
- Progress updates: * The laminations for the 8 cathode frames will be completed by tomorrow. Work to seal the exposed Rohacell edges is now underway. * Electrical QA on the new cathode boards has been completed. * Cutting of the edges of the cathode boards is now underway. One full board set has been trimmed. Brian expects the work to be completed by the end of next week. * A minor issue with our center cathode board panels is that there is a Cu dot and letters "AT" right in the middle of the central beam hole! This problem has been communicated to Allflex and will be rectified with the final board order. * We are working to finalize the procedure for laying up the 3 piece cathode panels. It appears we have a complete plan in place and a final mockup will be made with two dummy boards before laying up panels for the prototype. At this point, one panel has been prepared with the newest boards but the procedures used have been slightly modified. * Eugene has retensioned the 2 micron board that was made a month ago. He set the average tension to ~500 N/m and saw a 2% tension change after 1+ day. He believes it is good enough and we will attach the composite ring shortly. The flatness of the plane will be measured after the 5 micron board is scanned. - A portion of the rigid-flex assembly has arrived (50 each of the cathode boards and ground boards). The problem with the locating holes being to small (mentioned above for the wire frame PCBs) is present with these boards too. Roger will see to it that the holes are enlarged and the boards are passed on to Armen for soldering work. - Bill has been working on the cathode construction document. He has circulated a draft for comment. The file is located at /u/group/halld/Engineering/PRELIMINARY DOCUMENTS. - We are working to finalize the PR for the 2 micron cathode board material. Procurement will be negotiating with Nippon Steel Chemical Company to try to convince them to complete this order. Roger is also in discussion with the company that makes the 5 micron Cu boards about making the 2 micron boards. Stayed tuned for new developments. - Roger needs to prepare a document for QA/stuffing/cleaning for the cathode boards and a similar document for the cathode daughter boards and ground boards. - Bill has come up with a scheme to secure the cathode boards flat up against the granite rock of our flatness measurement table. The work is nearly done and should be ready to scan the 5 micron cathode early next week. - We still have one set of the 2-micron Cu boards from the first cathode order to lay-up. They will be needed for the full-scale prototype.
Cooling System Tests
- Fernando is in the process of writing up the results from his cooling system studies. Stay tuned for the GlueX note. He indicated that he is back to work on this document and it should be done shortly.
Cosmic Ray Test Stand
- Beni is continuing work to setup the cosmic ray telescope and test system in EEL 126. He would like to have it all up and functioning and understood before the end of June. - We still have some mysterious behavior with the small-scale prototype response with wiggles in the X vs. Y distributions that need to be understood. We decided to have a separate meeting to discuss what work we would like to do on the small-scale prototype. - Beni has started a bench test plan for the full-scale prototype and we discussed his preliminary document briefly. He will circulate it for feedback and we will continue to flesh it out. We want to make sure that we do some checks of gas leakage with the prototype. We agreed that the best procedure would be to use the P5 gas mixture (non-flammable). - Bill has designed a system to rotate the prototype from vertical to horizontal. The drawings will be submitted to the machine shop this week. - Safety paperwork for the cosmic ray test stand is being prepared now and will be submitted to Bert shortly.
- The FDC short-term work list has been posted on the FDC web site. 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.