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Beam Test @ GSI

Beam Test @ GSI. 12 C beam, 1 GeV/A, Pb-target Tested: Inner Read-Out Chamber 512 channels equipped with CERES preamp & FADC/Altro purpose: test stability of chamber at high load (< 50% occupancy) and high gain (<3  10 4 ). chamber. target. beam. Setup in CAVE B. Readout Scheme.

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Beam Test @ GSI

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  1. Beam Test @ GSI • 12C beam, 1 GeV/A, Pb-target • Tested: Inner Read-Out Chamber • 512 channels equipped with CERES preamp & FADC/Altro • purpose: test stability of chamber at high load (< 50% occupancy) and high gain (<3  104)

  2. chamber target beam Setup in CAVE B

  3. Readout Scheme

  4. Readout Scheme

  5. Cable

  6. CERES t=323 ns minimal undershoot t=426 ns

  7. Online Event Display

  8. Example: Pad Signal

  9. Occupancy (Pad-Time)

  10. Occupancy (Pad-Time)

  11. Occupancy vs. Target Thickness Uanode=1280 V 5 mm/ ≈ 20 A 10 mm/ ≈ 35 A

  12. Occupancy vs. Anode Voltage Uanode=1200 V Uanode=1250 V

  13. Occupancy vs. Beam Intensity R = 0.25106 part./spill R = 0.7106 part./spill R = 1.2106 part./spill

  14. Occupancy vs. Sum of Pad Signals

  15. Anode Signal low average current max. drift time

  16. Anode-Sum vs. Occupancy

  17. Summary • IROC tested at: • <Ianode> ≈ 5-80 A • occupancies ≤ 50% • Uanode ≤ 1300 V • we oberve: • stable operation • Ianode = 0 between spills • no saturation or gain drop in pad signals

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