1 / 12

TRD chamber production Status

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

Télécharger la présentation

TRD chamber production Status

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. TRD chamber production Status Status meeting 19.12.05 GSI

  2. 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

  3. 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

  4. 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.

  5. 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

  6. 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.

  7. Production status 18 shipped chambers included Sum: 124 Milestone: 50% of 60% by End of 2005 (162 chambers)

  8. 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.

More Related