1. Como, 15-19 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. 9105.CAEN COSTRUZIONI APPARECCHIATURE ELETTRONICHE NUCLEARI Via Vetraia, 11 - I 55049 VIAREGGIO (Italy) Phone: +39.0584.388398 Fax: +39.0584.388959 URL: http://www.caen.it Giuseppe Vitale

2. 7th Conf. on Advanced Technology and Particle PhysicsComo, 15-19 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

3. 7th Conf. on Advanced Technology and Particle PhysicsComo, 15-19 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)

4. 7th Conf. on Advanced Technology and Particle PhysicsComo, 15-19 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

5. 7th Conf. on Advanced Technology and Particle PhysicsComo, 15-19 Oct 2001 System for CMS  Drift Tubes System for CMS  Drift Tubes

6. 7th Conf. on Advanced Technology and Particle PhysicsComo, 15-19 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

7. 7th Conf. on Advanced Technology and Particle PhysicsComo, 15-19 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 tests @ CRC

8. 7th Conf. on Advanced Technology and Particle PhysicsComo, 15-19 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

9. 7th Conf. on Advanced Technology and Particle PhysicsComo, 15-19 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

10. 7th Conf. on Advanced Technology and Particle PhysicsComo, 15-19 Oct 2001 Remote Board irradiation tests III n V-I monitoring during irradiation

11. 7th Conf. on Advanced Technology and Particle PhysicsComo, 15-19 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

12. 7th Conf. on Advanced Technology and Particle PhysicsComo, 15-19 Oct 2001 Rad tolerance test n Test in 2001 with 60 MeV protons up to 7 kRad, 2*10 10 p/cm 2 (CRC)

13. 7th Conf. on Advanced Technology and Particle PhysicsComo, 15-19 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. 2-9721 80 V 50 A n Power supply Delta Elektronika SM7020 70 V 20 A n Oscilloscope Tektronix 3032

14. 7th Conf. on Advanced Technology and Particle PhysicsComo, 15-19 Oct 2001 DC-DC converter simplified model DC-DC converter simplified model

15. 7th Conf. on Advanced Technology and Particle PhysicsComo, 15-19 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)

16. 7th Conf. on Advanced Technology and Particle PhysicsComo, 15-19 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%

17. 7th Conf. on Advanced Technology and Particle PhysicsComo, 15-19 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%

18. 7th Conf. on Advanced Technology and Particle PhysicsComo, 15-19 Oct 2001 DC-DC Converter control philosophy DC-DC Converter control philosophy

19. 7th Conf. on Advanced Technology and Particle PhysicsComo, 15-19 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)

20. 7th Conf. on Advanced Technology and Particle PhysicsComo, 15-19 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