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Radiation tolerance and magnetic field behavior of CAEN HV and LV boards for LHC experiments

UNI EN ISO 9001 CERT. N. 9105.CAEN. Radiation tolerance and magnetic field behavior of CAEN HV and LV boards for LHC experiments. Giuseppe Vitale. COSTRUZIONI APPARECCHIATURE ELETTRONICHE NUCLEARI Via Vetraia, 11 - I 55049 VIAREGGIO (Italy) Phone: +39.0584.388398 Fax: +39.0584.388959

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Radiation tolerance and magnetic field behavior of CAEN HV and LV boards for LHC experiments

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  1. UNI EN ISO 9001 CERT. N. 9105.CAEN Radiation tolerance and magnetic field behavior of CAEN HV and LV boards for LHC experiments Giuseppe Vitale COSTRUZIONI APPARECCHIATURE ELETTRONICHE NUCLEARI Via Vetraia, 11 - I 55049 VIAREGGIO (Italy) Phone: +39.0584.388398 Fax: +39.0584.388959 URL: http://www.caen.it

  2. Talk summary • SY1527 system overview • CMS Muon Chambers supplies(radiation tests) • DC-DC converter (radiation and magnetic field tests) • Conclusions

  3. CAEN and COTS radiation tests • First COTS rad-tolerance tests in ENEA-Casaccia in ‘98 for CMS ECAL(collaboration with E. Longo, INFN- Roma1) • Tests with p and n in Louvain-la-Neuve, CRC in ‘99-’01 for CMS Muon Chambers (collaboration with M. De Giorgi, INFN- Padova/5% funding program)

  4. CMS Muon Drift Tubesoverview • ~200,000 Drift Tubes • 2x(+4 kV), +2 kV and -2 kV supplies required for each tube • Floating supplies for on-detector grounding • Remote systems • ~ kGauss magnetic field, ~1011n/cm2, <1 kRad in 10 y

  5. System for CMS m Drift Tubes

  6. 4 primary ch. + communication Provides also low voltages forremote boards 60 boards, 8 mainframesfor the whole system CMS m drift tubes Master Board

  7. 12 complex ch. + comm. link Allows V and I monitor on each output 240 boards p and n irradiation tests @ CRC CMS m drift tubes Remote Board

  8. First tests in ‘99 with neutron beam up to 60 MeV, 2*1011 n/cm2 (CRC) components failure Board redesigned: Tests in ‘00-’01 with 60 MeV protons up to 7 kRad, 2*1010 p/cm2 (CRC) successfully passed Remote Boardirradiation tests I

  9. Complete beam scanning over the whole board area 9x6 cm2 collimator used, 7 kRad dose, 2*1010 p/cm2 Remote Boardirradiation tests II

  10. Remote Boardirradiation tests III • V-I monitoring during irradiation

  11. CAEN LV solution for LHC experiments • A 4V 36A DC-DC Converter has been developed for LHC applications • First prototype successfully passed all radiation and magnetic field tolerance tests

  12. Test in 2001 with 60 MeV protons up to 7 kRad, 2*1010 p/cm2 (CRC) Rad tolerance test

  13. Magnetic field test setup • Magnet: MNP24-1 at CERN Bldg. 168 • B: up to 10 kGauss • Electronic load: Powertronic Mod. 2-9721 80 V 50 A • Power supply Delta Elektronika SM7020 70 V 20 A • Oscilloscope Tektronix 3032

  14. DC-DC convertersimplified model

  15. Results (I) • B field  to toroid plane • Low power (I load: 15 A) • B up to 8 kG • No significant efficiency loss (as expected)

  16. Results (II) • B field // to toroid plane • Low power (I load: 15 A) • B up to 8 kG • Efficiency loss due to B : 5%

  17. Results (III) • B field // to toroid plane • High power (I load: up to 36 A) • B up to 10 kG • Efficiency loss due to B : 11%

  18. DC-DC Converter control philosophy

  19. Acknowledgements We wish to thank all the following people: • Radiation tests: • E. Longo (INFN Roma 1) • M. De Giorgi (INFN PD) • Magnetic field tests: • S. De Pasquale, F. Cindolo, A. Marin (ALICE) • A. Fucci, L. Periale (CERN ESS-EP)

  20. Conclusions • CMS Muon HV Rad tests up to 7 kRad, 2*1010 p/cm2 passed • LV Rad tests up to 7 kRad , 2*1010 p/cm2 passed • LV Magnetic field tests up to 10 kG passed • HV/LV channels can be controlled via SY1527 mainframe • SY1527 can be easily integrated within DCS via OPC control

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