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Performance of Trigger Detectors at RHIC 2000: Paddle Counters, Cerenkov Counters, and Zero Degree Calorimeters

This study evaluates the performance of trigger detectors, including paddle counters, Cerenkov counters, and zero degree calorimeters, during the RHIC 2000 run. The functionality and geometry of these detectors are examined, along with their effectiveness in triggering and event selection. Preliminary results for the ZDC performance and paddle counters are also discussed.

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Performance of Trigger Detectors at RHIC 2000: Paddle Counters, Cerenkov Counters, and Zero Degree Calorimeters

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  1. Phobos Trigger SystemEdmundo Garcia, University of Marylandfor the PHOBOS Collaboration Introduction Trigger Detectors Paddle counters Cerenkov counters Zero Degree Calorimeters Performance of trigger detectors during run RHIC 2000

  2. Trigger detectors geometry

  3. Trigger detectors functionality

  4. Paddle Counters

  5. Cerenkov Counters

  6. Zero Degree Calorimeters

  7. RHIC 2000 - Triggering and event selection Paddles time difference (run 3551) Paddles time difference (run 3555) time (ns) time (ns) Light gray 9.5 ns window, gray mult. PP and mult. PN > 3. Green, events with ZDC time difference < 20 ns.

  8. RHIC 2000 - ZDC performance preliminary ZDCspectrum for data events at s1/2 = 130 AGeV ADCZP +ADCZN (neutrons)

  9. RHIC 2000 - Paddle counters performance Data accepted for publication Paddle mean spectrum for data events at s1/2 = 130 AGeV. The shaded region is the is most central 6% events by paddle cut.

  10. Final Notes • The paddle counters and zero degree calorimeters performed as expected in 2000 run • Cerenkov counters ready to be commission in 2001 • No mayor modification expected for the trigger system for 2001 preliminary

  11. Trigger logic diagram

  12. Trigger (ZDC) logic diagram

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