Fault Recovery Time for C100 Modules Spring ‘16

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Presentation transcript:

Fault Recovery Time for C100 Modules Spring ‘16 Review of the Digital LLRF Algorithm and Software for the C100 Cryomodules Fault Recovery Time for C100 Modules Spring ‘16 Bob Legg 13 June 2016

C100 FSD Trip Rates Spring 2016 Before 3/9, there were 29.8 hrs lost in 48 events over 5 minutes After 3/26, there were 4.7 hrs lost in 6 events over 5 minutes

Typical Recovery Time Plot

Details The recovery times presented are based on the Archiver. Lengths of time are determined by the difference between a cavity switching to SEL and switching back to GDR modes. The analysis tool is dumb. It does not correlate fault types (yet) so many of the trips do not have to do with the LLRF; e.g. Vacuum trips in SL often required hours to clear, but were not a LLRF feature. The analysis tool is dumb. It does not correlate faults between cryomodules, so common faults appear in all data sets. Data from CHL, vacuum valves and burning magnet faults were hand removed. The recovery times shown are averages, but the standard deviations for them as large as the average because of a few long recovery events. Again, these events do not necessarily have anything to do with the LLRF; e.g. He level goes unsteady as rf is switched off/on during fault and requires 45 minutes to settle.

Maximum Time to Recover C100, 25 Jan to 25 April

St.Dev= 3.51 St.Dev= 4.64 St.Dev= 3.88 St.Dev= 4.19 St.Dev= 4.34 St.Dev= 3.54 St.Dev= 3.63 St.Dev= 3.26 St.Dev= 3.12 St.Dev= 1.96

C100 Recovery Time vs. Time Ver. 71 Ver. 73 NL Update Ver. 74 Ver. 75 Ver. 73 SL

Summary Recovery times for the C100 cryomodules are improving. Recovery times statistics continue to be driven by a few very long recovery events. Beamline Vacuum valve closures Helium liquid level and pressure instability Poor heat management Recovery times for C100s still are longer than for the C20 or C50 modules. Please recommend a real Fault Logger be written.