Private:Hall D Staff Meeting, November 9, 2009 Present: Fernando Barbosa, George Biallas, Dan Carman, Tom Carstens, Eugene Chudakov (chair), Bill Crahen, John Domingo, Chuck Hutton, Mark Ito, Slava Razmyslovich, Elton Smith, Sascha Somov, Simon Taylor, Tim Whitlatch, Elliott Wolin, Glenn Young Eugene * The concrete floor of the Hall must be 3.5 feet thick, not 2 feet. This will cause at least a two month delay. * Interviews for new staff positions are done, candidates have been discussed, two candidates identified, backup candidate yet to be decided. * The PrimEx group have drafted a proposal for measuring the eta lifetime, to be submitted to PAC35. Two targets are called for: hydrogen and helium. Beam time is requested with the standard GlueX set-up, but with a wider collimator. Simon * Work in the EEL on the full-scale prototype: + leak problems being tracked down + looking at signals now + Fernando checking it out the chamber + both anodes and cathodes have been read-out + next step: put in second wire plane + then the full half-stack * Tracking: + multiparticle final states + rho signal being studied in the proton pi+ pi- final state + also studying 4 particle final states Mark * working on re-organizing the Offline Computing part of the project plan with Eugene and David * we will add target discussion to the Friday bi-weekly Time-of-Flight/Start-Counter/Target meeting * tracked down cause of exceptions in track fitting in his code: usually very difficult configurations: few hits, or curling tracks. Probably not a worry. Elton * BCAL readiness review: read into the record the preamble, findings, comments, recommendations, and preconditions to start of fabrications of module 1 from the draft of the committee's report. Additional recommendations were also made in the report. + Need procedure for measuring straightness of fibers after every layer * FCAL: we have received responses to RFP's from procurement, the committee will meet to review them. + includes mechanical support for the modules, building the Cockcroft-Walton bases + PMT procurement: might be a factory, not clear how ready the factory is, Denisov promised to find tubes, he promised estimates last week + Eugene: we could 1. get new tubes of the old type 2. get old tubes and put them through a qualification process 3. get new tubes of different type * BCAL readout: working with Chuck on drawings of light guides to buy. Plastic Craft representative has been contacted, need to get a time scale. Chuck * working on BCAL light guide drawings * started on Santa Maria model readjustments * trying to finish the FDC drawings * working with George and Floyd on items for the coil test, stands * Civil items: floor, electrical stubs Sascha * Updated gluex note on resolution studies. It discusses magnet width, position of the microscope and fixed array. With this the documentation finished, after discussing placement of counters with respect to the focal plane, it was decided that they will be on focal plane. The rate on microscope is an important consideration. Richard did a simulation of SiPM's with estimates of efficiency as function of rate; they cannot handle more than 4 MHz. If more than that, they are not 95% efficient because of the overlap problem. Also time resolution worsens from the nominal 200 ps. We still need final plots for the response to the reviewers' questions. * Trying to contact Franz Klein about the MOU with Catholic. Comments from Elton have been sent, no response. They are supposed to be responsible for the goniometer. Bill * Sealing the fdc prototype: + Glueline good, o-rings not, gas layer spacer too leaky, 133 cc/min. but a bubble out only every 4 or 5 seconds. + Need more radial real estate to implement redesign for sealing * Working on assembly drawings for FDC packages * Working on plan for quality inspection of wires Slava * Work on parts for central drift chamber: + grounding issue solution found + sealing of HV cable penetrations still an open question Tom * Working on the installation schedule, tasks and manpower * Working with George on coil, especially the TOSP * Working on the replacement of sensor wires for the coil * Got some hand tools from the tool crib, they are now on loan to Hall D * Got a printer/fax/scanner for trailer. * If there are tools we need to buy, Eugene wants a list. Fernando * Submitted PR for finishing contract with IUCF for the flash 125 * Elton: has the previous contract been closed out? Fernande: No. * Setting up the FDC prototype for tests later in the week Dan * Complete single layer test this week, Fernando doing the testing * Wants a GlueX note, even though limited-scale test. Should include signal-to-noise vs. wire length, strip length. * Later, add second layer to prototype, leak checking, signal checking * Bill: wonders about issue with gas mix quality, trapped gas * Will compare signal-to-noise for horizontal vs. vertical orientation of chamber. * Plateau voltage was different between full and small scale prototypes, with 90/10 and 40/60 gas. Wire in small-scale measured with SEM, 25 micron wire, not 20 microns, explains discrepancy. * Test for wire acceptance: discussions with Bill + vendor must meet specs + Steve wants to scale back on tests + Take two samples from each spool and examine with SEM microscope, check uniformity, some stress tests, yield test * We have received full shipment of wire Tim * Attended BCAL readiness review * Setting up for solenoid review next week * Working on estimate of manpower and costs to completion * Following CDC endplate fabrication * Crimp pin manufacturors are hard to find. Will talk to Hall B... Elliott * There will be an online meeting on Wednesday: + ICALEPS Conference report + Linux read-out controllers + progress on CMSG problems * coil tests: + get qweak area for testing, not sure when that becomes available + insulation on some wire is PVC: no good. Wire on order, three coils will have wire replaced when open, debate on fourth ongoing + cryocan ordered + instrumentation to be ordered, Scott and Elliott working on this + Chuck nominated for fastrack schedule development George His report: Coil 1 Kevin is fabricating the remaining super insulation and working on running different cable to the shield thermometers while we are preparing for the pressure test. I am working on the pressure system documentation. We are also adding the instruments external to the vessel. Coil 3 I continue delay of the statement of work for substituting the new shield. Coil 2 Turn support problem: The negatives of photos of the coil innards are here and Lorelei is having them scanned for Bill Crahen to start design concept. Test * Stand for the G-0 platform is in requisition system. * The new vapor cooled current lead contract is placed with American Magnetics but it required some servicing by the design folk to respond to vendor issues. * We are continuing working on the small modifications to the cryo can before procurement placement: shift in the feet, use of dogs or clamp flange to capture the bellows from the chimney, Define the wire harnesses and plugs to be preplaced into the insulating volume. Perhaps add an additional tube to convey the actual coil pressure to the pilot operated relief valve. * The overall assembly drawing for the test is continuing. We now have have many incidentals like Platform structural enhancement, can cleats, foot plates and interface plates on the personnel stands, incidental personnel scaffolding, U-Tube supports, added shims to the cryo can feet/cleat interface and coil lead splice detail in the chimney. * Cryo Can Best and Final bids are due Wednesday. * Josh Ballard continues working on the Cryo Interface and the pressure relief problem for helium and vacuum volumes. * Controls schematic drawings are going through an additional mark-up to respond to nomenclature definition and new instruments, signal readers and processors we are substituting or adding. We held a very productive working session where these issues were addressed. Elliott Wolen is looking at current drivers and signal readers and processors for some instruments that were not defined well and the result ripples through the schematic documentation. 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