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Transformers and the Linac4 Watchdog

Transformers and the Linac4 Watchdog. G. Bellodi , J-L. Sanchez, B . Mikulec with valuable input of o ur BI colleagues. Watchdog Architecture. Low-energy Watchdog Mainly to protect RFQ Compare average CURRENT measurement at L4L.BCT.3113 (at RFQ exit) to a fixed threshold (e.g. 20 mA)

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Transformers and the Linac4 Watchdog

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  1. Transformers and the Linac4 Watchdog G. Bellodi, J-L. Sanchez, B. Mikulec with valuable input of our BI colleagues

  2. Watchdog Architecture • Low-energy Watchdog • Mainly to protect RFQ • Compare average CURRENT measurement at L4L.BCT.3113 (at RFQ exit) to a fixed threshold (e.g. 20 mA) • Charge integration only in time window between stop and start of pre-chopper (between timings Pre-chop2 and Pre-chop3) • No user or destination dependency • User_Permit input to ‘Master BIC Source RF’ X

  3. Watchdog Architecture • Linac4 and L4T watchdog • Avoid losses and protect machine from damage • Compare NUMBER OF CHARGES between • L4L.BCT.4013 and L4Z.BCT.0293 for destination L4DUMP • L4L.BCT.4013 and LT.BCT30 for destinations LBE, LBS and PSB • 2 User_Permit inputs to ‘BIC Linac4 and Linac4 Transfer OK’

  4. Watchdog Architecture • LT/LTB/BI and LBE/LBS watchdog • Avoid losses and protect machine from damage • Compare NUMBER OF CHARGES between • L4L.BCT.1553 and BI.BCT20.S for destination PSB • L4L.BCT.1553 and LBE.BCT65 for destinations LBE • L4L.BCT.1553 and LBS.BCT64 for destinations LBS • 2 User_Permit inputs to ‘BIC Linac4 and Linac4 Transfer OK’ (or combined with watchdog no. 2.)

  5. Watchdog Architecture • PSB injection watchdog • Avoid losses and protect machine from damage • Indication for destruction of stripping foil • Compare NUMBER OF CHARGES between • BI.BCT20.S and BRi.TMD8L1 (sum over 4 rings after 100 turns) • 2 User_Permit inputs to ‘BIC PSB OK(1)’

  6. Watchdog Functionality for Watchdogs 2-4 Low-loss Watchdog: • No beam permit for specific USER if transmission in number of charges is below a user-specific threshold after a programmable number of BadPulseCounts (incrementing and decrementing of this counter per user) High-loss Watchdog: • No beam permit for specific DESTINATION if transmission in number of charges is below a set threshold (BadPulseCount hard-coded to 1)

  7. Transformer Specifications for Watchdog

  8. Conclusions • Specifications have been discussed and agreed with BI and measurements performed with 100/200 m cables and also short pulses (F. Lenardon) • Measured parameters fulfill all requirements • Will there be some degradation with operational conditions in tunnel? This should be part of the commissioning. • EDMS document (https://edms.cern.ch/document/1155020/0.2) will be updated with comments received in the approval round + this meeting and the final version submitted.

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