Minutes - ICD meeting Tuesday July 28, 1998 10-noon at UTA (with FNAL and LT by phone) send additions/corrections to Elizabeth Gallas Thanks Mark for writing the preliminary yield test results In attendance: Dick and Kathleen from LT, Elizabeth from FNAL. Andy, Ted, Kaushik, Mark, Jia Li, Paul. Lee is in Vancouver. ------------------------------------------------------------------------- Good progress all around this week (must be because of lack of meetings!) ------------------------------------------------------------------------- # next meeting 6-aug ------------------------------------------------------------------------- # ANOTHER WORKSHOP ? invite Jim ! The UTA DoE review is scheduled for August 13 (thursday). Lee has confirmed that he and possibly Craig (and others?) will be at UTA by friday morning. Dick and Kathleen fly through Dallas August 15 (saturday) so we could get together sunday and do some work. Lee returns from Vancouver. we'll discuss friday the plans. ------------------------------------------------------------------------- # DANIEL reports on the motherboard testing: "The testing of the Board is going well. There are only a few problems concerning the way some traces were laid out. Other than that, things seem to be going well. A full prototype should be finished soon so that a full test with a real PMT signal can be run. So things look good on the mother board side." His email address is dov001@engr.latech.edu . ------------------------------------------------------------------------- # ELIZABETH got an update on the SOLENOID TEST SCHEDULE and plans: by talking to to Rich Smith. The central muon iron will be closed. It is impossible to install the EF iron anytime before roll in. The central iron is most essential to contain the field within the collision hall. The Solenoid effort remains on schedule, which predicts high current testing from 9/11/98 to 9/24/98 and field mapping starting 9/25. The ICD iron/instrumentation will be installed after the initial field mapping. The ICD iron/instrumentation must be installed in the beginning of October on standalone structure. We must get the iron block to Fermilab ASAP because only at that point will Del plan to install it. We will argue for south because of open access (central muon will be closed, but south EC will be out of the area. EG has confirmed with Rich Smith that "...we will certainly turn on the central toroids while we are fieldmapping." ------------------------------------------------------------------------- # JIA LI posted latest Final ICD Stud Locations on his web page: http://www-hep.uta.edu/~lijia/ with the postscript as well. About the boss versus stud issue: Jack says installing studs is much easier and reliable since they have an efficient tool for doing this. Studs also take less space. Herm and Jack will review the new drawing, which has the new inner stud locations (2 per box straddling the FPS rib studs/bosses), but outdated cable routing (which does not need to be done right now). I'm sure they will let us know what they think. ------------------------------------------------------------------------ # ELIZABETH will pursue the beamline % EC survey/alignment question: For Run I, the ICD was aligned relative to the EC modules. For Run II, ICD will be aligned relative to the beamline (and FPS). We are concerned about the difference in the two schemes. Heresay has it (EG can't find any real numbers) that in Run I the EC modules were within a few millimeters of alignment with the beamline in R and phi. Are there numbers anywhere? If this is true, and also true in Run II, then there is no problem. If the relative alignment is off by more than a half inch, this is a problem. During the upcoming survey for the FPS/ICD to mark stud positions relative to the beamline, We will propose to survey marks indicating the EC module positions. This way we will know for sure if this is a problem. ------------------------------------------------------------------------- # PAUL reported on the LED calibration status: All the components are ready for the full prototype as well as the solenoid test. One issue is the location of the block on the backplane. For the tests (prototype and solenoid tests), EG suggests installing the block on top, since access is certainly easiest there and the polished fibers available are the long enough to reach all drawer locations. The best location of the block in Run II will be underneath (top is inaccessible). In the existing backplane enclosures, the slots for the signal connectors on the end will need to be closed up to make the backplane light tight. ------------------------------------------------------------------------- # ANDY/JIA LI reported on Crate Production Jia Li has delivered the final crate design to the UTA machine shop. The teflon for the runners has been ordered as well as the aluminum. Cost of materials is is about $70, the majority cost is labor. Andy will haggle over cost of machining, expected to be somewhere in between the low physics department rate ($5/hour) and an off-campus shop ($50/hour, $7k) to bring the cost under the budget allocation. Necessary components should be in the shop by the beginning of next week, when machining is expected to start. ONE CRATE IS NEEDED for the full prototype test before mid-august. Another will be needed to ship to FNAL for the solenoid test with the iron block. ------------------------------------------------------------------------- # KATHLEEN reports LT machine shop going into DRAWER PRODUCTION: The G code is working and the first prototype is in hand. FIFTEEN MORE DRAWERS ARE IN PRODUCTION and will be available for the august 13 meeting at UTA. LT will check the influence of the pmt socket wire size on the PMT spring load mechanism. After the drawers are evaluated in mid-august, production will begin promptly on the remaining 3 sets of 16 drawer (plus spares). ------------------------------------------------------------------------- # ANDY/LANI will order Bicron BCF-91A WLS 0.9 mm fibers for the pigtail production (2 meter/channel = 768 meters) and the fiber backplane (1 meter/channel => 384 meters) plus spare. 1 meter = 39.5". The latest Bicron quote for this WLS fiber was $2.23(1.24) per meter for less (more) than 1000 meters. Andy will order 5-6 spools (225 meters/spool) which will cost about $279/spool based on the over 1km price. Fibers should be delivered directly to Lab 7 and we need to let them know what lengths should be cut and which ends polished. 1. Pigtail fibers should be AT LEAST 27, 29 and 31" long (length of the groove plus the distance from the top of the groove to the connector edge for the largest [closest], midsize [mid eta], and smallest (furthest) tiles [from the connector edge]. 2. Calibration fiber length is not yet known (distribution block position is not yet determined). ------------------------------------------------------------------------- # MARK reports first results from the TILE YIELD TEST ! The test used the 1/2" thick scintillator prototype, previously wrapped in Tyvek/EMI paper, but partially unwrapped to get the test fibers in the tile grooves. There are six single polished WLS fibers available, two were polished by Jia Li at UTA, and the other four were polished at FNAL in Lab 5. The method used to obtain the yield is laid out in Kaushik's mail posted through the ICD notes page (dated July 2, 1998): 1. Read out a single tile using 2 fibers/groove (these fibers were ones polished at FNAL - additional tests may compare yields from the UTA polished fibers). 2. Two relatively well matched PMTs viewed each pair of fiber ends. Preliminary Setup: - The tile chosen was one with isolation grooves along three edges (the other edge will ultimately be painted with Bicron paint). - fiber ends were interfaced to the PMTs, using the reverse conical white nylon cookies Jia Li made, the ones with a third hole for the calibration fiber. Fibers were pushed forward in the cookies, leaving a relatively small air gap between the fiber end and the PMT (further tests may compare this small gap to a larger gap). - recall, the counting rate is with this trigger setup, so data is slow to accumulate. - the bottom of the tile was wrapped in tyvek, but not the top (top had black felt since it was not possible to wrap the top with the existing Tyvek template (perhaps a smaller square of Tyvek could be used to cover just that tile). Results after 1,2 runs = pe yield 10-20 pe or 20-24 pe, I don't know which to report. Recall that the absolute minimum requirement through the system is 10 pe, while the goal is 20 pe. This is roughly the same pe yield obtained from the thinner run I tiles, so perhaps improvements in the test will boost the yield. ------------------------------------------------------------------------- # Lee reports in absentia that 2nd prototype FIBER CABLES are in hand from Mitsubishi (made with Bicron fiber) and have been shipped to UTA. The spring loading on the fiber cables is still not right (epoxied), the connector pieces do now fit together because the appropriate distance was shaved off the connector tab. Mark plans to slip it into the teststand at some point to see if this cable performs better than the previous one (made with Mitsubishi fiber). -------------------------------------------------------------------------