TRD ROC Status

1. TRD ROC Status Material status, Problems, Schedule TRD workshop Cheile Gradistei Romania, 26.9.2005 TRD Workshop Cheile Gradistei 2005 Clemens Adler

2. Wire • Anode wire: • no major problem reported since March. • In Dubna and Hd: some Anode wire seemed weak (breaking during winding). • 10% of rolls identified as bad. • Recent deliveries looked very good. • Cathode wire: • Some doubts about quality occurring once in a while. 7% of rolls identified as ‘Bad’. • Also ‘good’ rolls display irregular surfaces-> increased danger of premature aging (Malter effect). • Different manufacturer available: will be tested at GSI in the next chamber. • Decision to buy new wire, discard old wire? TRD Workshop Cheile Gradistei 2005 Clemens Adler

3. TRD Workshop Cheile Gradistei 2005 Clemens Adler

4. Hardener • Bad batch of hardener: • Production stop for ~5 weeks • Additional delay due to shipment for Dubna/Bucharest • New Hardener tested by Jörg: OK (shear strength, surface conductivity) • Some changed behavior: longer curing time (24h), sticky surfaces already at <40% rel. humidity. • Bucharest: higher surface conductivity, humidity caught in sticky surface? TRD Workshop Cheile Gradistei 2005 Clemens Adler

5. GSI gain uniformity • Bad uniformity on L5C1 chamber • Most likely bent pad plane panels • Not really understood L4C1 panel glued with weight in the middle Good uniformity TRD Workshop Cheile Gradistei 2005 Clemens Adler

6. Schedule - Currently estimated end of production: 4/2008 (was: 1/2008 in Feb 2005) - Critical Path: GSI/Bukarest w/o delays (hardener): rate~0.9ch/week →stay with 1 ch/week guideline - Other production sites not critical (even at 0.5 ch/week rate for Hd/F) TRD Workshop Cheile Gradistei 2005 Clemens Adler

7. Schedule Future Material procurement • With production delays: • No material shortage expected before Autumn 2006 • Fits well with expected date of decision to build 100% (April 06 ?) • Realistic chance to get rest of material in time. TRD Workshop Cheile Gradistei 2005 Clemens Adler

8. Potential Stones on our way… 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 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 ??? TRD Workshop Cheile Gradistei 2005 Clemens Adler

9. Chambers for 1st SM • Chambers from Dubna and Bucharest will be shipped in October. • Chambers from GSI should arrive end of October • Chamber test of leak rate +HV after transport. TRD Workshop Cheile Gradistei 2005 Clemens Adler

10. Conclusions • Chamber production delayed by 3 month (compared to estimate in Feb) • Hardener: open questions? • Cathode wire: change manufacturer, how soon? • Schedule: still acceptable, but cannot afford much more delays TRD Workshop Cheile Gradistei 2005 Clemens Adler