TRD Status Meeting Münster Clemens Adler TRD ROC Status Status Meeting Münster

TRD Status Meeting Münster Clemens Adler Dubna Dubna chambers at GSI: –4 have damaged radiator on inside –2 chambers had so little glue there was almost no connection to bottom plate. – 2 persons will come End of Feb. to reconstruct opened Dubna chambers at GSI. L6C0 radiators are cut to L0C0 radiators Need material now: –L0 panels, front profiles, glue, back panels (L0) should be shipped ASAP. –L-profiles will have to be shipped end of February.

TRD Status Meeting Münster Clemens Adler Bucharest 3 more (final, tested) chambers since last SM Waiting for GSI to build a chamber ‘fast’, to see effects of ‘slow glue curing’. “We still consider that there are unpredictable, unreproducible results in terms of current although the production steps are the same.” Transport of chambers to Germany: Trying hard top find transport company with climate controlled trucks, who allows accompanying person.

TRD Status Meeting Münster Clemens Adler GSI Production and testing goes very well currently

TRD Status Meeting Münster Clemens Adler Heidelberg Requested more Manpower to accommodate extra load on our workshop during SM integration and L-profile production (Stancu is missed severely). A chamber with unconnected anodes (and new glue) showed gain reduction: –Understood as high resistance connection via glue (~10^12 Ohm).

TRD Status Meeting Münster Clemens Adler Hd cont. Last year: Now: Unconnected Anode

TRD Status Meeting Münster Clemens Adler Frankfurt Chamber production: –3 Frames-Radiators glued. –5 back panels-pad planes glued. –Wire tension measureing device works now. –Will try to wire a chamber this week. Padplane production (60% TRD): –3 pad planes to be soldered. –25 pc. need repair.

TRD Status Meeting Münster Clemens Adler Material: Radiators Many Radiators are not glued well between bottom plate and frame: –Rethink production approach? –Improved QA? Radiator laminate spares used up for Dubna repair: –Few radiators will have to be rebuilt –Will wait until April for further ordering (money)

TRD Status Meeting Münster Clemens Adler Material: Profiles L-Profiles: –Production not started due to SM mechanics delay until End of Jan. –Dubna needs L’s in March (latest!!!), Frankfurt in Feb. -> 2-4 week chamber production delay possible. Front Profiles: –Production restarted last week (L0).

TRD Status Meeting Münster Clemens Adler Material: Wire Cathode wire: –New manufacturer (Little Falls Alloy): wire looks very nice

TRD Status Meeting Münster Clemens Adler QA (slide from Cheile Grandistei) L-profiles: to be seen (Choice of material) Radiator: sometimes bad gluing joints, L0C1: carbon laminate came off easily: has to be watched Glue (Epoxy comp.: Aw116, AW106): QA needed Anode wire: changing quality; QA: difficult Cathode wire: changing quality; QA difficult Back panel: Quality control at Fischer (Manfred Mast): OK Pad planes: Quality control in Hd/F: OK Wire ledges/distance ledge: no problems expected Field cage PCB: no problems expected HV cable: so far only 1 bad batch, new rolls are tested at Hd, OK Signal cables: so far no problems: new order needed soon Glue (Hardener): tested and bought in large quantities ???

TRD Status Meeting Münster Clemens Adler QA: Notable Items Radiator: bad gluing joints: ? Glue (Aw116, AW106, HV953U): GSI will make a proposal on QA procedures. Signal cables: (1-2k cables will be reordered): Comparison with old cables. (Electrical tests?) L-profiles: Bending should not occur anymore (change of material) Anode wire: Recent quality good, REM pictures Cathode wire: New manufacturer (LFA), REM pictures

TRD Status Meeting Münster Clemens Adler Database Stefan Zimmer working on DCDB chamber information part: –Structures (re-)defined –Stefan will make some changes to Peters Material Database. -> Then no excuse will be accepted for not putting in material and chamber data.