trd roc status

26.5.2005 TRD Workshop Cheile Gradistei 2005 Clemens Adler

TRD ROC Status

Material status, Problems, Schedule

TRD workshop Cheile Gradistei Romania, 26.9.2005


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?


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?


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


Schedulefinished Prod. Rate

(ch./week)

(since Feb05)

Prod. Rate

(ch/week)

(since May05)

Bucharest 18 0,4 0.6

Dubna 36 0,75 0,5

GSI 23 0,65 0,7

Hd 22 0,25 0,25

- 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)


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.


Potential Stones on our way…

•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

•???


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.


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 roc status

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