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Beam Test @ GSI

This study presents the testing of an Inner Read-Out Chamber (IROC) with 512 channels, equipped with CERES preamplifiers and FADC/Altro, under high load conditions (<50% occupancy) and high gain (<3×10^4) using a 1 GeV/A Pb target beam. The test, performed in CAVE B, assesses the stability of the chamber at varying anode voltages and beam intensities. Results indicate stable operation with anode currents between 5-80 µA, sustained operation with no saturation or gain drop in pad signals, and clear performance metrics such as signal occupancy and response to target thickness.

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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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