1 / 16

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.

deanne
Download Presentation

Premature Dumps in 2011

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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.

More Related