4.2.2005 TRD Collaboration Meeting GSI Clemens Adler

TRD Chamber production issues

General Issues, Planning and Hd Status

4.2.2005 TRD Collaboration Meeting GSI Clemens Adler

Anode wire qualityDubna wire:TW002

TW 002x2

4.2.2005 TRD Collaboration Meeting GSI Clemens Adler

Anode wire quality cont.

TW 003 before Meteor (Dubna)

TW 003 after Meteor

4.2.2005 TRD Collaboration Meeting GSI Clemens Adler

Anode wire Quality cont. 2

Bukarest wire:

Black spots visible by eye

More information to come after looking at different rolls

4.2.2005 TRD Collaboration Meeting GSI Clemens Adler

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?

4.2.2005 TRD Collaboration Meeting GSI Clemens Adler

HV cableManufacturer: „Low noise is not a feature of this wire“

• 300 m delivered in December: production date: 2002

-> 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

4.2.2005 TRD Collaboration Meeting GSI Clemens Adler

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.

4.2.2005 TRD Collaboration Meeting GSI Clemens Adler

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

4.2.2005 TRD Collaboration Meeting GSI Clemens Adler

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)

4.2.2005 TRD Collaboration Meeting GSI Clemens Adler

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

4.2.2005 TRD Collaboration Meeting GSI Clemens Adler

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)

4.2.2005 TRD Collaboration Meeting GSI Clemens Adler

Schedule• Layer 6 scenario:

(decision this weekend)

finish L6C0 material and include in next Dubna transport (in 3 weeks):->1st Supermodule Chambers: May 1st (+transport from Dubna/Bukarest)

decision in 3 weeks:additional transport to Dubna,->1st Supermodule Ch:July 1st (+transport time)

• Layer 0 scenario:(decision this weekend)

L0C0,L0C1 Material at Hd: May 1stL0C0 material in Dubna: June 15th->1st Supermodule Chambers:July 1st (+transport) (unefficient, better have a transport in Sept./Okt.?)

(Assuming no Quality Problems)

4.2.2005 TRD Collaboration Meeting GSI Clemens Adler

Dubna: Chamber Transport Dates

Type Delivery

April 30

Delivery

Oktober

L0C0 7

L1C0 7

L2C0 6

L3C0 4 6

L4C0 5 3

L5C0 4 3

Sum 26 20

Supermodule assembly August:

Type Delivery

April 30

Delivery

July

Delivery

Oktober

L0C0 2 5

L1C0 7

L2C0 6

L3C0 4 5 1

L4C0 5 2 1

L5C0 4 3

Sum 26 8 12

Supermodule assembly November:

4.2.2005 TRD Collaboration Meeting GSI Clemens Adler

Bukarest Schedule

Type/Date July,1 October ?

L1C0 2

L2C0 2

L2C1 12 8

L3C1 8 8

Sum 24 16

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

4.2.2005 TRD Collaboration Meeting GSI Clemens Adler

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 rateSuggest to use as a ‚base plan‘ until more detailed rate info is available

4.2.2005 TRD Collaboration Meeting GSI Clemens Adler

Heidelberg Status

• 9xL1C1 finished

• 2xL1C1 being wired

• 3xL1C0

• 3xL2C0

• 1xL1C0 not usable? (Badly glued Padplane: maybe repair possible)