1. Results of SIC Prototype development 0 Results of Tests and Developments of SIC Prototypes Anne Dabrowski Northwestern University on 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

2. Results of SIC Prototype development 1 SIC Development During 2001

3. Results of SIC Prototype development 2 Glass Prototypes Studies: Signal isolation Gas volumes around collector Gas gain Gas plateau studies Gap sizes

4. Results of SIC Prototype development 3 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)

5. Results of SIC Prototype development 4 Ceramic SIC Design

6. Results of SIC Prototype development 5 D4 D1

7. Results of SIC Prototype development 6 Mountings at Radiation Calibration Facility (FNAL) “Flat mounting”“Side Mounting”

8. Results of SIC Prototype development 7 Results of Tests …

9. Results of SIC Prototype development 8 What Changed? Design 1 vs. Design 2 The electrode edge … Curved Flat Effected slope of plateau … reduced by ~ 70 %

10. Results of SIC Prototype development 9 Results D2 vs. D4

11. Results of SIC Prototype development 10 Results D2 vs. D4

12. Results of SIC Prototype development 11 Slope Improvement Design 4 Volume of gas between electrode and guard ring reduced …

13. Results of SIC Prototype development 12 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.

14. Results of SIC Prototype development 13 Tests at ATF (BNL) covered by Gokhan (NWU)

15. Results of SIC Prototype development 14 Test Setup Booster

16. Results of SIC Prototype development 15 Booster (FNAL) High intensity ~ 1e9 proton source 1.5  s per spill

17. Results of SIC Prototype development 16 Booster (FNAL) Plateau in the beam (1.8e11)

18. Results of SIC Prototype development 17 Booster (FNAL) Intensity scan

19. Results of SIC Prototype development 18 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

20. Results of SIC Prototype development 19 Summary Radiation 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

21. Results of SIC Prototype development 20 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.

22. Results of SIC Prototype development 21

23. Results of SIC Prototype development 22 D 4