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TRD chamber production Status. Status meeting 19.12.05 GSI. More Glue issues?. Recent dark current problems at Bucharest: uA dark currents at 1300-1500 V in 2 chambers Disappeared after some time. Worries: Might happen again because we have no safety margin

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trd chamber production status

TRD chamber production Status

Status meeting 19.12.05 GSI

more glue issues
More Glue issues?
  • Recent dark current problems at Bucharest:
    • uA dark currents at 1300-1500 V in 2 chambers
    • Disappeared after some time.
    • Worries:
      • Might happen again because we have no safety margin

Christians tests show that we have a ~100x safety margin

      • Implications on chamber building workflow

Psychological and storage problem

    • GSI will try to build a chamber as fast as possible to “verify”.
    • No changes in procedure
radiators on airplanes
Radiators on Airplanes
  • 18 Dubna chambers were shipped to GSI in October as agreed
  • Cracks of the Rohacell of the outer Radiator cover were noticed.
  • Theory:

800mbar ambient pressure on plane->200mbar overpressure

  • Problem can be easily prevented by introducing venting holes

But: they have to be closed soon due to hygroscopy of the Rohacell

200mbar ~1000N/compartment

dubna chamber strategy
Dubna chamber Strategy
  • Will open all chambers (Yuri will send 2 technicians ~end of Jan-Feb).
  • Reassemble OK chambers (Fibre mats, Rohacell laminate (possibly with involvement from Münster?).
  • Complete test after reassembly (shared between GSI, Frankfurt, Heidelberg).
  • Broken chambers: cut off pad plane panel and reuse.
future shipment strategy
Future shipment strategy
  • If on plane:
    • Need for venting hole in every Rad. Compartment.
    • Has to be closed later due to hygroscopy of rohacell.
  • Truck:
    • Not necessarily safer concerning other stress?
    • To be discussed
1st supermodule implications
1st Supermodule implications

Need: 1xL3C0, 1xL4C0, 1xL5C0 chamber by April,1st 2006.

  • Scenario 1:
    • Available chambers can be used (after opening and closing)
  • Scenario 2:
    • Pad plane panel can be reused: rebuild other parts (Radiator, L-profiles, Front profiles), e.g. in Heidelberg.
  • Scenario 3:
    • Dubna delivers 3 chambers by car (climate controlled, non-stop ride).

Decision in February.

production status
Production status

18 shipped chambers included

Sum: 124

Milestone: 50% of 60% by End of 2005 (162 chambers)

material issues
Material issues
  • New L-profiles arrived (polyester-glasfiber)
    • First profiles are glued
    • Looking very straight
    • Machining not possible currently due to SM mechanics production
  • Front profiles:
    • New raw material arrived.
    • Machining also suspended due to lack of workshop time.
  • L-profile shortage upcoming in Dubna, Heidelberg, Frankfurt.
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