Difference between revisions of "Minutes-10-1-2009"
From GlueXWiki
(→Wire Frame Update) |
|||
Line 69: | Line 69: | ||
to come. | to come. | ||
- The wire frame construction document is located at: | - The wire frame construction document is located at: | ||
− | /u/group/halld/Engineering/PRELIMINARY DOCUMENTS. | + | /u/group/halld/Engineering/PRELIMINARY DOCUMENTS. We will include |
− | the information on the wire electroplating process | + | the information on the wire electroplating process shortly. |
- The parts of the jig to use for the wire electroplating operation | - The parts of the jig to use for the wire electroplating operation | ||
are in our hands. They will be assembled as we find time. | are in our hands. They will be assembled as we find time. |
Latest revision as of 08:46, 17 December 2009
FDC Weekly Meeting
Date: October 1, 2009
Participants: Daniel, Brian, Beni, Bill, Simon, Tom, Fernando, Mark S., Mark I., Chuck, Eugene
Next Meeting: October 8, 2009 @ 1:30 p.m.
Contents
Manpower Update
- Stephen Burnett has gone back to Hall B but we expect him to rejoin us as soon as Hall B physics starts up again. This might be on Monday. Brian Kross will be off the project for the month of October. Our new technician hire, Casey Heck, will be joining the FDC effort starting immediately.
General Construction Updates
- We are presently gearing up to begin stack construction for the full-scale prototype. As part of stack construction, we will do a 3D voltage check with a cathode-wire-cathode configuration in an Ar-CO2 gas environment to nominal voltage to be sure that there are no breakdown problems. Stay tuned for details - The preliminary FDC stack assembly document draft is located at: /u/group/halld/Engineering/PRELIMINARY DOCUMENTS. The document will be fleshed out during the assembly procedure for the full-scale prototype. - o-ring update: We plan on using the nominal design for the full-scale prototype using a thin bead (not continuous) of instant adhesive along the bottom. Bill is pursuing some other ideas to improve our future design. - We have to be out of the clean room by October 15. We are presently planning to move the clean tent into EEL 126. Tom Carstens will be taking the lead on this move and the action will start tomorrow and continue into next week.
Wire Frame Update
- Wire frame P1 status: * The low voltage power connector was repaired by Michelle Brisiel. We are going to cludge up a repair to the broken card guide on the preamp card connector. * P1 is essentially ready to go for the next steps before lamination to its cathode plane. - Wire frame P3 status: * Brian has replaced the 3 wires that were broken and the frame has been reinspected. After cleaning with alcohol and lint-free wipes and after sitting in the dry tent for several days, the measured currents were all below 100 nA. * We want to set up once again the test where the wires are in gas to see how things look. Hopefully with a new understanding of the o-rings, we will not have too much trouble setting this up again. * This frame seems nearly ready for the next steps before lamination to its cathode plane. - Wire frame P4 status: * On Friday we cleaned P4 with a immersion/rinse bath first of isopropyl alcohol and then deionized water. The frame sat in the dry room over the weekend. Three of the field busses drew more than 5 uA at about 100 V. We put the frame in a dry nitrogen environment for 2 more days and the currents are better.Two of the busses are still in pretty bad shape current-wise, however one of the problematic busses went up to 1 kV and drew "only" 600 nA. We are investigating. - To strengthen the connections of the power connections and preamp card connections, all boards prior to stack assembly will have mechanical QA work done, strengthening with epoxy, and the preamp card connectors will be subject to Fernando's QA test rig. - 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. - 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. - The parts of the jig to use for the wire electroplating operation are in our hands. They will be assembled as we find time.
Cathode Update
- Progress updates: * The mechanical work on all cathodes is complete. We have connected the grounds on each panel together for two cathodes. We will continue the work on the remaining cathodes just before they are needed for stack construction. * Fernando is overseeing the QA electrical tests on the rigid-flex assemblies. We have enough in our possession to get started on the soldering work and the remainder should be done by the end of next week or so. * Some of the rigid-flex assemblies have failed QA and cannot be saved. We do not have enough for the full prototype detector. We will move to prepare an order for the remainder that are needed. * Mark S. has been working with Fernando to finalize the procedures for soldering the rigid-flex assemblies to the cathodes. They are nearly done and work is expected to begin soon on the soldering to the first cathode. - The current draft of the cathode construction document is located at: /u/group/halld/Engineering/PRELIMINARY DOCUMENTS. - Roger is pressing the Japanese company that has agreed to provide our board material. They have agreed to manufacture the material and it appears it will be delivered to JLab by the end of this year. - 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.
Cosmic Ray Test Stand
- Beni is continuing work to setup the cosmic ray telescope and test system in EEL 126. He is making progress on reducing the noise and is working to reproduce the data from the small-scale prototype that Simon had last year. The latest plots are in the FDC electronic logbook at: http://www.jlab.org/Hall-D/detector/fdclog/ - 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. Beni has gotten a larger data set on the small-scale prototype and the wiggles are still present. There seems to be a high-frequency wiggle and a low frequency wiggle. See the FDC logbook for plots. - Beni has started a bench test plan for the full-scale prototype and is presently working on it after incorporating feedback. The current information is contained on the FDC wiki page under the heading "FDC test cosmic ray test stand".
Work List
- 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.