Results of SIC Prototype development

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Results of Tests and Developments of SIC Prototypes

Anne Dabrowski

Northwestern Universityon behalf of the SIC team

M. Velasco 1 , G. Ünel 1, P. Ball 2 , G. Graham 2, G. Tassotto, F. Krueger 3 , D. Anderson 3, S. Goy 1, T. Fonseca 1, R. Tilden 1

1 Northwestern University

2 Richardson Electronics

3 Fermilab

June 14 – 18, 2001

Minos Collaboration Meeting, Ely

Results of SIC Prototype development

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SIC Development During 2001

G lass C ham ber

C eram ic C ham bersD esign 1 , 2 , 3 , 4

Design

ATF (BN L)

E lectron Source(e8 - e9)

R adia tion C alibra tionFacility (FN A L)Photon Em ission

424 R /hr

Booster(FN AL)

Proton Source(1e11 - 1e12)

Testing

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Glass Prototypes

Studies:

•Signal isolation

•Gas volumes around collector

•Gas gain

•Gas plateau studies

•Gap sizes

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Move to Ceramic Design

Reduces the gas volume under guard ring and signal electrodes

Decreases slope in plateau

Ceramic design is radiation hard – (ceramic, nickel, iron, cobalt)

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Ceramic SIC Design

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D4

D1

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Mountings at Radiation Calibration Facility (FNAL)

“Flat mounting” “Side Mounting”

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Results of Tests …

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What Changed?Design 1 vs. Design 2

The electrode edge … Curved Flat

Effected slope of plateau … reduced by ~ 70 %

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Results D2 vs. D4

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Results D2 vs. D4

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Slope Improvement Design 4

•Volume of gas between electrode and guard ring reduced …

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Summary of Radiation Test Facility Results:

•Great reproducibility

•Measure small currents

•Invested in both Keithley Electrometers and Powers Supplies

•LABview DAQ – user enter customized measurement parameters – automated DAQ

•Slopes of D2 and D4 good – but not quite flat.

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Tests at ATF (BNL) covered by Gokhan (NWU)

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Test Setup Booster

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Booster (FNAL)High intensity ~ 1e9 proton source

1.5 s per spill

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Booster (FNAL)Plateau in the beam (1.8e11)

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Booster (FNAL)Intensity scan

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Summary of results from Booster:

• See a plateau in the beam and the halo

• Doesn’t saturate before 5 e11

• See gain at 200 V in the beam center – (needs more investigation) vs. gain at 350 V in the “halo”

• Don’t anticipate radiation damage … will check in the radiation calibration facility

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SummaryRadiation Test Facility:

D4 Ar Slope of 0.0025 +- 0.0005

D2 Ar Slope of 0.00364 +- 0.00004

D2 He Slope of 0.0007 +- 0.0005

Booster:

Saturate after 5e11 (D2)

Plateau in the beam center (D2) reproducible for 2 measurements

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What Next ?

We have made 3 different chambers … have money to make 10 in total (Richardson Elec. and NWU)

•Calibrate chambers with forced gas contamination (gas scheme move to NWU soon) (D. Anderson T. Fonseca)

•Continue MC studies for signal response & change in flux due to extra material (S. Goy)

•Do studies on Secondary Emission on chamber in a vacuum.

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Results of SIC Prototype development

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D 4