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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.