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Premature Dumps in 2011

M.Albert LHC Beam Operation Workshop December 2011. Premature Dumps in 2011. Acknowledgements: A.Macpherson , G.Papotti , M.Zerlauth. Outline. Introduction Data extraction Dump statistics by mode Dump causes Dumps in STABLE BEAMS Summary. Introduction.

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Premature Dumps in 2011

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  1. M.Albert LHC Beam Operation Workshop December 2011 Premature Dumpsin 2011 Acknowledgements: A.Macpherson, G.Papotti, M.Zerlauth

  2. Outline Introduction Data extraction Dump statistics by mode Dump causes Dumps in STABLE BEAMS Summary

  3. Introduction • Every dump generating PM data is assessed by shift crew usingPM Online tool. • All beam dump characteristics are collected and stored in the PM Database. • Dumps at 3.5 TeV are systematically reanalyzed by MPS experts.(M. Zerlauth, R. Schmidt, J. Wenninger) • Analysis of PM data for p+ run: • 19/02 (first beam) – 30/10/2011 (last dump) • IB1 > 1e12 and IB2> 1e12 (exclude probes, MPS tests)

  4. PM Online Tool Classification & Assessment by OP

  5. LHC Post Mortem Database URL: lhc-postmortem.cern.ch DB Query Query builder, Reports &Data download access to DB

  6. All beam dumps by mode

  7. Non-programmed dumps by mode Total: 375 (78%) Inj. problems: ~10 %

  8. Beam dump causes E >= 3.49 TeV IB1 > 1e12 IB2 > 1e12 169 263 272 42% Orbit, BPM, Beam Loss, Collimator adjustments, BCM, Feedbacks 71% LBDS, PIC , BLM , BIC , SIS 10% 79%

  9. Beam dump causes by equipment E >= 3.49 TeV IB1 > 1e12 IB2 > 1e12 “TOP 5”: 77% of dumps in SB

  10. Beam dump causes by beam monitoring E >= 3.49 TeV IB1 > 1e12 IB2 > 1e12

  11. Systems which saved us… E >= 3.49 TeV IB1 > 1e12 IB2 > 1e12

  12. STABLE BEAMS – often short !

  13. Dumps in STABLE BEAMS SEUs by system Cryogenics: 16 QPS: 15 Coll System: 4 PC: 2 PIC: 1

  14. Recovery after dump in SB Average: 4.6h Fill 1958 (S34) Fill 1996 (P8)

  15. Proposals for improvements PM Online tool should offer re-editing (correction of wrongly assessed dumps) Include injection scheme in PM-Database Do we need to add more categories for dump classification?“Other” used for 11% of non-programmed dumps Should we also systematically analyse dumps at injection energy ?

  16. Summary Beam dump causes due to equipment failures clearly dominate. 50% of all fills & “1380b – fills” last < 3h Average fill duration: ~5h 22% of STABLE BEAMS - fills were dumped by SEU effects, mainly on cryogenics and QPS equipment The average time from a beam dump in STABLE BEAMS to the next injection is ~4.5h.

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