TRD Collaboration Meeting GSI Clemens Adler

1
TRD Chamber production issues

• General Issues, Planning and Hd Status

2
Anode wire quality
Dubna wire TW002
TW 002x2
3
Anode wire quality cont.
TW 003 before Meteor (Dubna)
TW 003 after Meteor
4
Anode wire Quality cont. 2
Bukarest wire Black spots visible by eye More
information to come after looking at different
rolls
5
Anode Wire Quality Summary

• Status
• 3 bad roll in Bukarest (out of 3), dust on
  Meteor.
• 2 bad rolls in Dubna (out of 14? How many were
  examined), dust on Meteor.
• Heidelberg Wire OK, sometimes dust on Meteor (3
  rolls so far).
• GSI no Problem.
• Solutions
• Better wire? Is it available, price?
• Look at every winding feasible? (REM not easily
  accessible at Hd and Dubna.
• Can bad wire be identified under the light
  microscope?

6
HV cable

• Manufacturer Low noise is not a feature of this
  wire
• 300 m delivered in December
• production date 2002
• -gt Perfect (few nA starting at 6kV)
• 700 m delivered in January
• production date 2004
• OK few nA starting at 3-4kV
• New wire will be distributed to Bukarest and
  Dubna in next delivery.
• Currently every wire is tested at Dubna/Bukarest
  
• no showstopper

7
Problem Chamber Hd

• As reported at last Status meeting
• 1 Chamber displayed high anode currents after
  glueing Panel starting at 1100V (was OK
  previously) independant of anode segment used.
• After 1 month in the corner chamber is OK ?!?
• Not understood so far.

8
L-profile bending

• Dubna had some bent L-profiles, with residual
  bending after gluing frame.
• Check in Heidelberg some profiles bent more than
  acceptable (250um at each side).
• Investigation currently under way probably only
  relevant for the first series.
• Please check before gluing a frame

9
Gas connectors

• Problem 1
• Hole in front profile can be too
• small (due to wear of tools)
• should be larger than 19,00mm
• Problem 2
• Gas connectors (glued into front profiles) are
  very sensitive parts
• No glue residuals, no scratches allowed.
• For gas tightness grease is probably needed.
• ToDo chamber connection test (gas tightness of 2
  or 3 Chambers in a row)

10
Anode wire breaking

• Dubna and Heidelberg use Olegs solution (see
  picture).
• Dubna experiences breaking even after fixing
  chambers to table
• Heidelberg has problems with copper strip not
  gluing to wire ledge.

Dubna solution to prevent removal of copper strip
during soldering
11
Material Database

• Still very little use, but it is an undebatable
  requirement!!!
• Maybe leave out unecessary steps during shipping
  (e.g. Padplanes should be sent from Frankfurt to
  Dubna etc.)
• Serial numbers of Radiator/Chamber, Panel,
  Padplanes, wire rolls have to be noted and kept
  (also for DCDB)

12
Schedule

• Layer 6 scenario
• (decision this weekend)
• finish L6C0 material and include in next Dubna
  transport (in 3 weeks)
• -gt1st Supermodule Chambers May 1st (transport
  from Dubna/Bukarest)
• decision in 3 weeks
• additional transport to Dubna,
• -gt1st Supermodule Ch
• July 1st (transport time)

• Layer 0 scenario
• (decision this weekend)
• L0C0,L0C1 Material at Hd May 1st
• L0C0 material in Dubna
• June 15th
• -gt1st Supermodule Chambers
• July 1st (transport)
• (unefficient, better have a transport in
  Sept./Okt.?)
• (Assuming no Quality Problems)

13
Dubna Chamber Transport Dates
Supermodule assembly August
Supermodule assembly November
14
Bukarest Schedule

• Unclear (to me)
• Climatic constraints?
• Customs requirements? (fixed export dates)
• Is a large transport more efficient?

15
Estimated SM production dates(just from Chamber
point of view)
Transport delays not taken into acount All
estimates based on 1 Chamber/week average
production rate Suggest to use as a base plan
until more detailed rate info is available
16
Heidelberg Status

• 9xL1C1 finished
• 2xL1C1 being wired
• 3xL1C0
• 3xL2C0
• 1xL1C0 not usable? (Badly glued Padplane maybe
  repair possible)