Como, Oct 20017th Conf. on Advanced Technology and Particle Physics Radiation tolerance and magnetic field behavior of CAEN HV and LV boards for LHC experiments UNI EN ISO 9001 CERT. N CAEN COSTRUZIONI APPARECCHIATURE ELETTRONICHE NUCLEARI Via Vetraia, 11 - I VIAREGGIO (Italy) Phone: Fax: URL: Giuseppe Vitale

7th Conf. on Advanced Technology and Particle PhysicsComo, Oct 2001 Talk summary n SY1527 system overview n CMS Muon Chambers supplies (radiation tests) n DC-DC converter (radiation and magnetic field tests) n Conclusions

7th Conf. on Advanced Technology and Particle PhysicsComo, Oct 2001 CAEN and COTS radiation tests n First COTS rad-tolerance tests in ENEA- Casaccia in ‘98 for CMS ECAL (collaboration with E. Longo, INFN- Roma1) n 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)

7th Conf. on Advanced Technology and Particle PhysicsComo, Oct 2001 CMS Muon Drift Tubes overview n ~200,000 Drift Tubes n 2x(+4 kV), +2 kV and -2 kV supplies required for each tube n Floating supplies for on-detector grounding n Remote systems n ~ kGauss magnetic field, ~10 11 n/cm 2, <1 kRad in 10 y

7th Conf. on Advanced Technology and Particle PhysicsComo, Oct 2001 System for CMS  Drift Tubes System for CMS  Drift Tubes

7th Conf. on Advanced Technology and Particle PhysicsComo, Oct 2001 CMS  drift tubes Master Board n 4 primary ch. + communication n Provides also low voltages for remote boards n 60 boards, 8 mainframes for the whole system

7th Conf. on Advanced Technology and Particle PhysicsComo, Oct 2001 CMS  drift tubes Remote Board n 12 complex ch. + comm. link n Allows V and I monitor on each output n 240 boards n p and n irradiation CRC

7th Conf. on Advanced Technology and Particle PhysicsComo, Oct 2001 Remote Board irradiation tests I n First tests in ‘99 with neutron beam up to 60 MeV, 2*10 11 n/cm 2 (CRC)  components failure Board redesigned: n Tests in ‘00-’01 with 60 MeV protons up to 7 kRad, 2*10 10 p/cm 2 (CRC) successfully passed

7th Conf. on Advanced Technology and Particle PhysicsComo, Oct 2001 Remote Board irradiation tests II n Complete beam scanning over the whole board area n 9x6 cm 2 collimator used, 7 kRad dose, 2*10 10 p/cm 2

7th Conf. on Advanced Technology and Particle PhysicsComo, Oct 2001 Remote Board irradiation tests III n V-I monitoring during irradiation

7th Conf. on Advanced Technology and Particle PhysicsComo, Oct 2001 CAEN LV solution for LHC experiments CAEN LV solution for LHC experiments n A 4V 36A DC-DC Converter has been developed for LHC applications n First prototype successfully passed all radiation and magnetic field tolerance tests

7th Conf. on Advanced Technology and Particle PhysicsComo, Oct 2001 Rad tolerance test n Test in 2001 with 60 MeV protons up to 7 kRad, 2*10 10 p/cm 2 (CRC)

7th Conf. on Advanced Technology and Particle PhysicsComo, Oct 2001 Magnetic field test setup Magnetic field test setup n Magnet: MNP24-1 at CERN Bldg. 168 n B: up to 10 kGauss n Electronic load: Powertronic Mod V 50 A n Power supply Delta Elektronika SM V 20 A n Oscilloscope Tektronix 3032

7th Conf. on Advanced Technology and Particle PhysicsComo, Oct 2001 DC-DC converter simplified model DC-DC converter simplified model

7th Conf. on Advanced Technology and Particle PhysicsComo, Oct 2001 Results (I) n B field  to toroid plane n Low power (I load: 15 A) n B up to 8 kG n No significant efficiency loss (as expected)

7th Conf. on Advanced Technology and Particle PhysicsComo, Oct 2001 Results (II) n B field // to toroid plane n Low power (I load: 15 A) n B up to 8 kG n Efficiency loss due to B : 5%

7th Conf. on Advanced Technology and Particle PhysicsComo, Oct 2001 Results (III) n B field // to toroid plane n High power (I load: up to 36 A) n B up to 10 kG n Efficiency loss due to B : 11%

7th Conf. on Advanced Technology and Particle PhysicsComo, Oct 2001 DC-DC Converter control philosophy DC-DC Converter control philosophy

7th Conf. on Advanced Technology and Particle PhysicsComo, Oct 2001 Acknowledgements Acknowledgements We wish to thank all the following people: n Radiation tests: –E. Longo (INFN Roma 1) –M. De Giorgi (INFN PD) n Magnetic field tests: –S. De Pasquale, F. Cindolo, A. Marin (ALICE) –A. Fucci, L. Periale (CERN ESS-EP)

7th Conf. on Advanced Technology and Particle PhysicsComo, Oct 2001 Conclusions n CMS Muon HV Rad tests up to 7 kRad, 2*10 10 p/cm 2 passed n LV Rad tests up to 7 kRad, 2*10 10 p/cm 2 passed n LV Magnetic field tests up to 10 kG passed n HV/LV channels can be controlled via SY1527 mainframe n SY1527 can be easily integrated within DCS via OPC control