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Radiation worries in the cavern L.Jirdén 17.6.02

Radiation worries in the cavern L.Jirdén 17.6.02. ACR. CR1. CR2. CR3. CR4. PLUG. ~50m. ~15m. ALICE DETECTOR. BEAM. Access. Cavern only accessible during shutdowns !. ~55m. ACR. 0.5 T. PLUG. ~50m. ~15m. BEAM. Magnetic field. Two main magnets L3 and MUON dipole. No impact

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Radiation worries in the cavern L.Jirdén 17.6.02

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  1. Radiation worries in the cavernL.Jirdén 17.6.02

  2. ACR CR1 CR2 CR3 CR4 PLUG ~50m ~15m ALICE DETECTOR BEAM Access Cavern only accessible during shutdowns ! ~55m

  3. ACR 0.5 T PLUG ~50m ~15m BEAM Magnetic field Two main magnets L3 and MUON dipole No impact Stray fields, impact ? Shielding DC/DC’s, etc ~55m

  4. Radiation levels in ALICE • Simulation made by B.Pastircak • 3 main sources: • Particle production at interaction point: 90% • Beam-gas interactions: 10% • Beam loss at injection: 1% • Conditions • Global running scenario PbPb, CaCa, pp • Geometry as known early 2002 • Results • Normalized to 10 years normal operational scenario Total dose [krad] Fluency [n*cm-2] • Rack on the floor ~ 1 ~109 • Rack 12m above floor ~ 0.006 ~107

  5. ACR 200 175 rad hard el. required 2 4.3 COTS ok, SEU strateg racks in c-rooms 1 0.9 SEU strategy ? gas distribution 0.006 0.0006 minor effects? PLUG ~50m racks in cavern ~15m ALICE DETECTOR BEAM Radiation levels dose n.fl. Krad E10 n/cm2 ~55m

  6. Radiation tests

  7. Consequences • Test by experiments • Extensive tests of “on-detector components” • Very few tests of ALICE “cavern components” • ATLAS ELMB test since 3 years • Wiener Power supplies, CAEN DC/DC • Test of equipment by LHC machine • Ongoing effort since 5 years • Wide range of equipment tested • power supplies, PLC’s, sensors, gagues, vacum equipment, etc • Mainly using TCC2 facility • Levels in LHC tunnel and ALICE cavern similar? To be checked!

  8. LHC tests TAX collimator M2 beam line SPS - North Experimental Hall TCC2 Hall and Beam Lines T6 Target Radiation Damage Test Area

  9. LHC tests Modular Power Supplies Denis Hundzinger - SL/PO • Test of 3 Different Technologies: • Serial Regulation • Switching with Bipolar, Transformer Coupling • Switching with MOS-FET, Transformer Coupling • 28 Units Tested – 11 Types – 6 Manufacturers • Remarks: • Some Units Do Not Restart after Switch-Off • Output Voltage Drifts With or Without Input Power

  10. LHC tests Switching Power Supplies Type: - VERO PK55 (2 Modules) - Triple Switching + 5V/5A and 2x 5-15V/1A Notes: - Measurement on 5 Volt Output Only - Load = ~ 4 Amp - Output Voltages increase with the Radiation Dose - Both 5 Volt Output Voltages Start to Deteriorate at ~ 5 Grays ~ 5 Gray ~ 540 Gray

  11. LHC tests Preliminary Results • PLC - First Error (Isolated Effect) at < 1 Gy - After Reload, Systematic Memory Error 4-8sec. 5 Gy - No Reply 20 Gy • Edwards Gauges (With Integrated Electronics) - Gauge AIMX-X 50 Gy - WRG-S 1000 Gy • Balzers Gauges - 2 Gauges PKR 251 290 Gy and 430 Gy - 1 Gauge PKR 265 450 Gy

  12. LHC tests Lessons Learned • Electronic Equipment that Will not Work Reliably in the LHC Tunnel: • Intelligent Sensors and Actuators (Few Exceptions) (Remote Electronics and Cables Required) • Complete Industrial PLCs (COTS) • Intelligent I/O Modules (COTS) with Micro and Memory • Conventional Switching Power Supplies (NMOS) • Processors Without Error Correction Memory

  13. LHC tests Lessons Learned • LHC Electronic Equipment That Needs to be Tested before Installation: • Passive Components (Optical Fibers, Resistors, Capacitors) • Active Components (Signal Conditioners, MUXs, Op.-Amp., ADCs, DACs, FPGAs, EPROMs SRAMs with EDAC) • Sensors, Actuators, Gauges, Positioners,Valves, Flowmeters • Modular Power Supplies (Serial Regulation, Bipolar Transistors, Transformer Coupling Feedback, No OptoCouplers)

  14. LHC tests Lessons Learned • RadHard Developments are Required for: • Simple Input/Output Modules with Fieldbus Interfaces to WorldFIP or Profibus (Command/Response Operation) • Dedicated Power Supplies (Quench Protection) • Orbit Corrector Power Converters • Control Processors with EDAC Memory and Remote Reset Capability.

  15. LHC tests Conclusions Present Results Suggest that ALL Electronic Systems, Intended for Installation in the Tunnel, Should be Radiation Qualified The Radiation Test Facility is Qualified to ProvideaRadiation Environment Similar to That of the LHC Tunnel (Arcs) The On-Line Test Facility can be Used for the Final Qualification of Complete Working Systems

  16. What equipment is planned for ALICE cavern? • Power distribution (Hazemeyer) + control • Network equipment • LV supplies • CAEN 1527, Wiener PL500, AREM Pro, Eutron, ? • HV supplies • CAEN 1527, ISEG, ? • Gas • Distribution for some detectors • Cooling • Cooling plants & its control • Detector cooling I/O • VME • Crates and modules • Others?

  17. Conclusion • More detailed simulations needed • Effects (at middle and low levels) to be better understood • Strategy to be defined • Possibility to move equipment from UX to PX? • Systematic qualification of “cavern equipment”? • Who does what?

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