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Radiation Effects and Testing Results for ALICE Experiment

This document presents detailed findings from the radiation testing within the ALICE experiment framework, focusing on the simulated doses received in different zones over a decade. It highlights the contributions of neutrons (2MeV and 20MeV) to radiation effects and summarizes the performance of critical components like MANAS and MARC under radiation exposure. The results indicate no significant issues with the Mu Arm tracking chambers concerning Total Ionizing Dose (TID) and outline ongoing verification needs for electronic systems within the project, notably for the CROCUS crate.

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Radiation Effects and Testing Results for ALICE Experiment

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  1. FF - 30/08/04 Dimuon Arm layout A = FE Electronics (MANU) B = CROCUS Crate C = TCI Crate (below dipole magnet) A = 500 Rad & 5.6 1011 cm-2 B 170 Rad & 1.9 1011 cm-2 C 1.4 Rad & 2.6 108 cm-2 (this last case is not worrisome) Simulated doses in Tracking Chambers for 10yrs of ALICE

  2. FF - 30/08/04 MANU = ZONE A CROCUS = ZONE B Components for irradiation TCI = ZONE C

  3. FF - 30/08/04 Energy spectra of neutrons (most important component of radiation) 2MeV 20MeV Only ~10% of the total hadron fluence (2MeV) contributes to the radiation effects Fluences to consider for SEE (10yrs of ALICE): A = 5.6 1010 cm-2 B = 1.9 1010 cm-2 90% 8.4% 1.6% THERMAL NEUTRONS

  4. FF - 30/08/04 Results from “already known”components

  5. FF - 30/08/04 Test Beam at Centre de Protontherapie d’Orsay (CPO) = protons 50-200MeV (DUT 1 & 2 = 21.8kRad; DUT 3 = 12.8kRad) DUT 1 = 4 MANAS (Pedestals, Noise and Gain) DUT 2 = ADC Voltage Ref (Vout) DUT 3 = MARC (BERR in config RAM and with only data = 0s or FFFs) Ipwr monitored for SEL

  6. FF - 30/08/04 500Rad 64 chs of MANAS: Noise and Pedestals -19 ADC counts 5 days annealing 64 chs of MANAS: Gain parameters (2nd order fitting) (calibration signals 0-120fC, internal capacitors)

  7. FF - 30/08/04 500Rad Vref ADC Errors in MARC (RAM of thresholds) (no SEUs in functional circuit) 5.6 1010 (>2MeV) 5mV drop (Fully recovers after 4 days) • 8.1 bit errors/MARC/10yrs • 23 SEU/day in sation1 • 56 SEU/day whole detector • <16 THRs affected by SEU / 6 hours beam life time

  8. FF - 30/08/04 F.F. conclusions: • Test campaign well started • No problems in Mu Arm Trk Chambers for TID. • Only SEE to test • Main custom chips (MANAS, MARC) are ok • Important verification to be done in zone A is the ADC • Work to be concluded: • CROCUS crate electronics to test, • because devices that can affect large part of system.

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