1. 21.12.04TRD Status meeting IKFClemens Adler TRD ROC Status -Dubna -Bukarest -GSI -Frankfurt -Heidelberg

2. 21.12.04TRD Status meeting IKFClemens Adler Production Status

3. 21.12.04TRD Status meeting IKFClemens Adler Dubna Status 6 Chambers tested with X-ray (2 with Sr90): gain uniformity <+-14%gain uniformity <+-14% 2 Chambers tested in air (HV test) 2 Chambers to be tested 4 Frames ready for wire transfer Panels are not glued: Question where to glue the chambers?

4. 21.12.04TRD Status meeting IKFClemens Adler Bukarest Status 2 Chambers finished 2 Chambers planned to be finished until Christmas.

5. 21.12.04TRD Status meeting IKFClemens Adler Bukarest Status cont. Fe55 measurement: –Ar CO2 (70/30), anode: 1650V, drift: -800V –source trough gas connector hole

6. 21.12.04TRD Status meeting IKFClemens Adler Bukarest Status cont. Accident: At anode:1300V, drift: at 1100V: Strange noise, power supplies tripped. -> Open chamber: 1 anode wire broken in the middle, little black craters in Radiator surface. Also noticed: anode wire looked like it was not covered with gold everywhere. Still unclear what happend, investigation is ongoing.

7. 21.12.04TRD Status meeting IKFClemens Adler Heidelberg Accident ? L1C1 Chamber was tested before gluing: everything well. After gluing: large current (several uA) starting at 1100 V. Independent of anode segment 1/3 of current is flowing to cathode, rest is missing ?!? Plan: test in Air, look for missing current

8. 21.12.04TRD Status meeting IKFClemens Adler Problem 1: Anode wire Dubna: Gold dust on Meteor (not noticed with other wire) Heidelberg: Gold dust on Meteor. Bukarest: Au-coating is removed from large portions of the wire. Question to forum without notice so far. What to do???

9. 21.12.04TRD Status meeting IKFClemens Adler Problem 2: HV cable HTC 50-1-1 HV cable is drawing currents (surface leak currents across isolator) Now seen at all Production sites. Manufacturer: wire OK (up to 12 kV) ->low current requirements very special?!? Plan: Buy new cable: 300 m from CERN stock OK to 6 kV. Distribute new cable to production sites

10. 21.12.04TRD Status meeting IKFClemens Adler Problem 3: Anode Breaking Sanding of wire ledge edges improves situation After ~5 Chambers w/o problems (Hd) 1 broken Anode wire. Oleg suggests: Problem: additional curing step: 1 day delay Solution: Hd will try Araldite 2012: curing time ~10 minutes

11. 21.12.04TRD Status meeting IKFClemens Adler Problem 4: Unconnected Pads 8 Panels (L1C1): no unconnected pads Most recently tested: 1 cable with 3 unconnected pads Wolfgang started a little test run to quantify effect of bending signal wires.

12. 21.12.04TRD Status meeting IKFClemens Adler Problem 5: Winding machine Heidelberg: control unstable: was fixed in Oktober, so far OK Bukarest: tension Problems, fixed.

13. 21.12.04TRD Status meeting IKFClemens Adler Wire thickness Wire thickness goes into determination of wire tension. Definition of lower tension limit necessary (cathode: 80cN, anode: 40 cN) due to wire sag. Proposal: Since wire thickness seems to vary (75-82um), put wire thickness for the roll numbers on the www (GSI?!?).

14. 21.12.04TRD Status meeting IKFClemens Adler Material Status: L-Profiles 48% of 60% TRD finished

15. 21.12.04TRD Status meeting IKFClemens Adler Material Status: Front Profiles 38% of 60% TRD finished Will increase production by involving other workshop

16. 21.12.04TRD Status meeting IKFClemens Adler Further issues Better coordinate Material needs/deliveries –Material Database requirement Improve communication between Labs: –GSI Forum is started to be accepted, but usage must be intensified. Please make sure you are „Subscribed“. General Production plan: –Still large uncertainties in production rate, due to ever continuing problems. –Will try to provide something until Collaboration meeting