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First TRD Production Chambers. Production Tests Results Documentation. Nov/Dec: Vist from Oleg and Sasha (Dubna): Parallel production of 2 chambers at Heidelberg Test of chambers: Christmas 2003-January 2004. New(s) (Challenges): -Glueing of Padplane-panel-assembly

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First trd production chambers

First TRD Production Chambers

Production

Tests

Results

Documentation

TRD Collaboration meeting GSI Clemens Adler


Production of first chambers

Nov/Dec: Vist from Oleg and Sasha (Dubna):

Parallel production of 2 chambers at Heidelberg

Test of chambers: Christmas 2003-January 2004

New(s) (Challenges):

-Glueing of Padplane-panel-assembly

(100 cables have to be fed trough holes)

-Wacosit Profile extruded in final shape (easier to use than standard G10 parts)

-Winding machine after modifications

Production of first Chambers

TRD Collaboration meeting GSI Clemens Adler


Padplane glueing

Feeding cables trough Backpanel cutouts worked well

Glueing of Padplane to Honeycomb works, but can still be improved

Padplane glueing

TRD Collaboration meeting GSI Clemens Adler


Wacosit profiles

Wacosit is behaving good, minor quality improvements are discussed with Manufacturer

Wacosit profiles

TRD Collaboration meeting GSI Clemens Adler


Wiring

Oleg glueing Anode wires discussed with Manufacturer

Wiring

TRD Collaboration meeting GSI Clemens Adler


What we learned

All current materials behave well. discussed with Manufacturer

Tooling needed:

Positioning of wire ledges,

Distance ledges

Crane for lifting of winding frame (installed in January)

New winding frames (arrived)

What we learned:

TRD Collaboration meeting GSI Clemens Adler


Tests

Dark current: discussed with Manufacturer

(Was a Problem with Prototype chambers)

At first dark current started at ~1400-1500V.

After some conditioning (over night at <50 nA)

Dark Currents <1 nA

Leak Rate

Xe-cost driven

Gain uniformity

Electronics driven

Tests

TRD Collaboration meeting GSI Clemens Adler


Preparation for tests

Grounding of Padplane: discussed with Manufacturer

Adhesive copper tape: not reliable

Foldback clips, w. conductive foam:

Complicated to use

->use of PCB with real connectors to ensure reliable grounding of Padpane while testing (in devel.)

Gas filling:

Issue: time

Procedure: flush Chamber with 80-100 l/h Ar/CO2 with open Gas-in-outlets. 1000 ppm O2 level after 2-3 h.

Connect outlet etc. and flush at 20 l/h overnight

->few ppm level next morning

Preparation for tests

TRD Collaboration meeting GSI Clemens Adler


Gain uniformity chamber1

Left: copper tape grounding discussed with Manufacturer

Below: foldback clips grounding

Gain Uniformity Chamber1

Low areas where foldback clip

was not connected to ground

Gain uniformity <+-10%

TRD Collaboration meeting GSI Clemens Adler


Gain uniformity chamber 2

Looks „flat“ discussed with Manufacturer

Source collimation is not sufficient for detailed study

->X-Ray test stand should give better results

Gain Uniformity Chamber 2

TRD Collaboration meeting GSI Clemens Adler


Leak rate

Determined by measureing O2 concentration (and assuming diffusion leaks)

Upper limit: 1,5-3 mbar*l/h

Test chamber performance:

<0,5 mbar*l/h

(last year chamber: <0,2 mbar*l/h, with greased gas inlets)

Leak rate

TRD Collaboration meeting GSI Clemens Adler


Leak rate cont i

Solution diffusion leaks):

Check that gas exits chamber down to low flow rates (1l/h).

But: 1 l/h leak diffusion dominated?

->O2 conc. method fails

Use sniffer to detect leaks

???

Problem:very large leaks (some l/h) will also show „reasonable“ leak rates (<3mbar*l/h) with O2 method.

Leak rate cont. I

TRD Collaboration meeting GSI Clemens Adler


Leak rate cont ii

Leakage of two connected chambers: diffusion leaks)

Sniffer could detect leaks at gas connections.

->grease should be used to improve leak rate

Leak rate cont. II

TRD Collaboration meeting GSI Clemens Adler


Test parameter suggestions

Leak Rate: diffusion leaks)

upper limit:

1 mbar*l/h

Gain Uniformity:

±15% limit (electronics limited)

Test parameter suggestions

  • Absolute Gain

  • Reasonable goal:

  • <0,5 mbar*l/h.

  • Higher leak rates can be detected with a sniffer

  • Reasonable goal:

  • <± 10% ?

  • Currently limited by the source.

  • (pressure dependant)

Common Set of expected anode current values at defined parameters (Anode-,Drift- voltage)

TRD Collaboration meeting GSI Clemens Adler


Documentation of common standards
Documentation of common standards diffusion leaks)

  • Chamber building HowTo needed

    • Information is mostly there. Format?

  • Document with all Dimensions and allowable tolerances

  • Document with Test limits (somewhat more explicit than in this presentation)

TRD Collaboration meeting GSI Clemens Adler


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