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MSS2

MSS2. Magnet Safety System. MSS Magnet safety system. What is MSS ? MSS is a part of MCP ( Magnet Control Project). It started in 1998 and the first system was installed for Atlas CS in 2003 Protects the LHC experimental magnets (Alice, Atlas, CMS, LHCb )

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MSS2

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  1. MSS2 MagnetSafety System MSS2

  2. MSS Magnetsafety system • Whatis MSS ? • MSS is a part of MCP (Magnet Control Project). It started in 1998 and the first system wasinstalled for Atlas CS in 2003 • Protects the LHC experimentalmagnets (Alice, Atlas, CMS, LHCb) • Interactswith LHC machine protection for Beam Dump • Gives a toolcalled ‘Annunciator’ to find the causes of an abnormalmagnet stop • Acquisition system based on a VME crate, • Record MSS eventsat a rate of 1kHz. MSS2

  3. MSS rack structure • MSS Rack iscomposed of 4 types of crates: • API : concentrates MSS signals and distributesthem to ACS and LCS crates. • ACS : receives and treatsanalogsignals and sendsresults to LCS crates, • LCS : receives digital signalsfrom API and ACS, an FGPA will combine thesesignals and take actions to protect the magnets, • APC : sends FPGA orders to dependentsystemssuch as magnet power supply, cryogenic plant, quenchheaters… CMS MSSA rack MSS2

  4. MSS AnalogInputs Signals Atlas Central Solenoid Atlas Toroids MSS2

  5. MSS2: evolution of MSS • Why MSS2 ? • Some MSS components are obsolete : • FPGA • Isolation amplifier • Aimsatsimplifing the system to be able to equipanymagnet • Superconductormagnetslike Atlas toroids (Inom = 20187A) or COMPASS Solenoid (Inom = 660A) • Warm magnetslikeLHCb (Inom = 5850A) MSS2

  6. MSS2 Structure • Samephilosophy as MSS • Modern components • Replacement of AlteraFPGA by a CompactRIOfrom National Instruments • Simplified structure • Design of new analogcardswhichallow to measure voltage taps,temperatures, and SQD, • Treatmentof analogsignalsdone in the CompactRIO, • Annunciatorwillbeinclude in the Coompact RIO Controller. MSS2

  7. MSS2 rack structure • User interface unit with touch screen • VAC module: Versatile Analogue Chassis, Analogue 3U chassis containing 8 analogue modules (2 or 4 channels), interfaces and redundant power supplies • MAC module: Main Chassis, Principal 6U chassis of the MSS2 system; contains CRIO controller, interfaces and redundant power supplies • APC module: Application Control, MSS Chassis with relays for application control MSS2

  8. MSS2 test bench • Based on PXI cratefromNational Instruments • VeristandLabVIEWtoolbox • Edit analog and digital stimulus patterns to simulate inputs • Acquire digital outputs from APC • Combine stimulus and output acquisition to validate the behavior of the system MSS2

  9. MSS2 for COMPASS • For the polarizedtarget, the COMPASS magnet system iscomposedof : • 1 solenoid (Inom = 660A, L = 12.65H) • 1 dipole (Inom = 590A, L= 2.6H ) • 16 correctors (Inom < 15A) Thesemagnets are in the same cryostat. • PH/DT-DI wasasked to refurbish the control and safetysystems MSS2

  10. COMPASS MSS2 parameters • For quenchdetection, wewill use : • 4 bridges DUP1, DUP2, DUP3 and DUP4 • 2 voltages of the current leads Vadi1 and Vadi2 • 1 SQD (SuperconductingQuenchDetection)for each CL (Current Lead) • For quenchdetection, wewill use : • 3 bridges DUP1, DUP2, DUP3 • 2 voltages of the current leads Vadi1 and Vadi2 • 1 SQD at the bottom of each CL MSS2

  11. MSS2 for M1 magnet (SPS north beam test area) • Built in the 80’s • Composed of twosuperconductivemagnets in twodifferents cryostats • Used by Atlas and CMS to test detector electronicswithbeam and magneticfield • PH/DT-DI wasasked to do the refurbishment of the control system and the safetysystem The magnet can be rotated by 90° Beam Beam Sylvain Ravat PH/DT-DI

  12. M1 MSS2 parameters For quenchdetection, wewill use : • Currentleads foot temperatures • Heliumlevel for each cryostat • Voltage of eachcoils • Bus bars temperatures MSS2

  13. CONCLUSION • Some hardware and software tests are alreadydonewith the test bench: • Analogpart (VAM + VAC) -> Improvement of the currentsource stability -> Modification of the PCB to includedifferential or single endedanalogsignals • CRIO part (MAC) -> OK • State Machine -> OK • Annunciator -> OK • Replacement of NI Touch Panel by a Industrial PC withTouchScreen • In order to validate the behavior of any MSS system in ourlab, weneed to finalize the toolwhichwill permit to edit and generate digital and analog pattern on the test bench. -> by the end of May 2013 • If the tests of MSS2 on M1 and COMPASS magnets are successful, wewill propose the replacement of MSSA for the solenoid of ATLAS(and the otherexperimentalmagnets in the LHC experimentseventually). And theywill continue to ensure the safety of M1 and COMPASS. MSS2

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