Difference between revisions of "Minutes-3-4-2010"
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==Construction Space== | ==Construction Space== | ||
− | - Lubomir has prepared a [http://www.jlab.org/~pentchev/FDC/FDC_floor_plan.pdf floor plan layout] that was sent to Glenn for action and planning. Glenn | + | - Lubomir has prepared a [http://www.jlab.org/~pentchev/FDC/FDC_floor_plan.pdf floor plan layout] that was sent to Glenn for action |
− | + | and planning. Glenn has gone over this with Rolf Ent and they are working | |
− | + | out a plan. Stay tuned. | |
- Lubomir will be in charge of working on a plan for appropriate clean | - Lubomir will be in charge of working on a plan for appropriate clean | ||
space for FDC construction in EEL 126. | space for FDC construction in EEL 126. |
Revision as of 16:44, 4 March 2010
FDC Weekly Meeting
Date: March 4, 2010
Participants: Daniel, Simon, Beni, Lubomir, Bill, Roger, Fernando, Eugene, Brian, Glenn, Chuck, Kim
Next Meeting: March 11, 2010
Contents
Construction Space
- Lubomir has prepared a floor plan layout that was sent to Glenn for action and planning. Glenn has gone over this with Rolf Ent and they are working out a plan. Stay tuned. - Lubomir will be in charge of working on a plan for appropriate clean space for FDC construction in EEL 126. - Lubomir will work with Bill to procure our second granite table.
General Construction Updates
- The two-layer prototype continues under source tests in the cosmic ray test facility. We plan to open up the detector for work on and inspection of the HV busses by March 15 to give DSC time to work on the detector and also to diagnose the problem before circuit board procurement. - The third wire/cathode layer is ready for testing pending availability of manpower. - We want to try putting the oxygen sensor in our system and measure the oxygen contamination on our input and output lines. Due to the worries about high input impedance of this device, we have some additional checking to do. We will test pending availability of manpower. - The preliminary FDC stack assembly document draft is located at: /u/group/halld/Engineering/PRELIMINARY DOCUMENTS. We will review this document in the coming weeks to update out-of-date or old procedures. - Fernando would like us to add the final version of the HV multi-pin connectors to the full-scale prototype. We will do this when the detector is taken apart. - Fernando needs us to finalize the wire and cathode naming conventions for the FDC. Lubomir will take responsibility for this work.
Frame Modification Studies
- The dummy Kapton cathode has been laminated to its frame. The Mylar version did not adhere well and had to be scrapped. The plan is to use the cathode material to simulate the second cathode plane and the ground plane. Work on this will continue next week pending availability of manpower. - Bill has put together a few slides showing the frame design changes. - The redesigned frame piece for the wire board is expected back from the shop within a couple of weeks.
Wire Frame Update
- The wire frame construction document is located at: /u/group/halld/Engineering/PRELIMINARY DOCUMENTS. - Kim has circulated the PCB drawings to the group for feedback and review. We should have about 3 weeks to complete this work. The plan is not to move forward with procurement until after inspection/diagnosis/repairs of the HV/current problems seen in the full-scale prototype. - The single piece PCB version and the version reducing the PCBs from six to four pieces has been set aside due to excessive costs. - DSC is finalizing the tension specifications for winding. It looks like the +/-5% spec is unnecessarily tight. Looks like +/-20% is full satisfactory.
Cathode Update
- The current draft of the cathode construction document is located at: /u/group/halld/Engineering/PRELIMINARY DOCUMENTS. - The cathode board stock material has been delivered to Allflex for storage. - The next rigid-flex design meeting will take place shortly. - We would like to push to get the cathode board procurement done by the end of March. - David Lawrence is working to give us input on the hole size in the cathode center. Stay tuned.
Prototype Testing
- The current version of the full-scale prototype test plan is on the GlueX portal as (GlueX-doc-1304). - To connect the full-scale prototype to the readout electronics, Fernando is designing a simple translator board that allows connection from the 24-channel preamp connector to the 16-channel connectors on the ADCs and TDCs. These boards should be ready next week. - The signal cables for the full-scale prototype are being made up by Fernando's group and will be ready shortly. - Two layer test update: See plots made by Beni and Lubomir in the FDC Log Book. - The delivery of the remainder of the preamp cards for the full-scale prototype will be in mid-March. - Fernando will pursue purchasing enough cathode ground boards for all six cathode planes for the full-scale prototype. - A while ago we focussed on the wiggles seen in the reconstructed wire position from the cathodes (see log entry 419) in the FDC logbook. We believe that the periodicity seen is due to the algorithm Beni is using to determine the U and V centroids. Stay tuned.
Construction Updates
- The sense wire SEM checks are now complete and the wire sample reports have been posted on the FDC Reports Page. - DSC talked to Keith Solberg at IUCF this week regarding the status of the review of the Phase 3 budget for the wire winding. Keith will be meeting with Vladimir Derenchuk early next week for final review. They indicated that we should have the budget in the first part of next week. - It is time for the next Phase 3 preparation meeting with Keith Solberg, Bill, and DSC. DSC will work to schedule this only after we have a preliminary Phase 3 budget in our hands. See the work plan at: Phase 3 Preparation Work - Master list on wire and cathode frame redesign work is located at: Frame Modification Work. - Bill has circulated a brief write-up regarding the plans for the summer work at IUCF. We are reviewing it internally. We will schedule a meeting with Keith and Vladimir shortly after we have discussed it so that they can prepare a budget estimate for the work.
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.