1 / 13

Do you believe in Operation Statistics? Presented at the Accelerator Reliability Workshop 2011

Do you believe in Operation Statistics? Presented at the Accelerator Reliability Workshop 2011. Paul Scherrer Institut. Andreas Lüdeke. Paul Scherrer Institute (PSI), Switzerland. PSI: Swiss national research center 1300 employees. Proton facility: 1 MW cw beam Spallation neutron source.

stacey-curtis
Download Presentation

Do you believe in Operation Statistics? Presented at the Accelerator Reliability Workshop 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. Do you believe in Operation Statistics?Presented at the Accelerator Reliability Workshop 2011 Paul Scherrer Institut Andreas Lüdeke

  2. Paul Scherrer Institute (PSI), Switzerland PSI: Swiss national research center 1300 employees • Proton facility: 1MW cw beam • Spallation neutron source • Proscan SC cyclotron • Cancer therapy • Swiss Light Source (SLS) • e- storage ring • 400mA, 2.4 GeV PSI West: Large Research Facilities Andreas Lüdeke, Paul Scherrer Institute at the ARW11 in Cape town, 11-Apr-2011 Slide 1

  3. Swiss Light Source Operation • Swiss Light Source is • In operation since 2001 • A user facility with 19 beam-lines in operation • Providing ~ 5000 hours beam to users per year • Users need to apply for beam time • Just 30% of the proposals are accepted • Accepted users need to wait about 6 month for beam time • One important metric to judge machine quality Andreas Lüdeke, Paul Scherrer Institute at the ARW11 in Cape town, 11-Apr-2011 Slide 2

  4. 3rd Generation Synchrotron Light Sources: Availability Availability [%] Year Andreas Lüdeke, Paul Scherrer Institute at the ARW11 in Cape town, 11-Apr-2011 Slide 3

  5. Availability: "Concours des Alpes" Availability [%] Year Andreas Lüdeke, Paul Scherrer Institute at the ARW11 in Cape town, 11-Apr-2011 Slide 4

  6. Availability: "Concours des Alpes" Availability [%] Year Andreas Lüdeke, Paul Scherrer Institute at the ARW11 in Cape town, 11-Apr-2011 Slide 5

  7. Metrics of the Swiss Light Source (SLS) Availability definition: “Delivered_Beam_Time” = “Beam_for_Users” during “User_Time” “User_Time" = “Scheduled_User_Time" + "User_Reserve_Time” Example for 2005: • Uncompensated Availability Andreas Lüdeke, Paul Scherrer Institute at the ARW11 in Cape town, 11-Apr-2011 Slide 6

  8. Elettra Metrics for Availability • Thunderstorms are excluded from failure statistics at Elettra • Example from 2005: • Availability including outages from thunderstorms: Andreas Lüdeke, Paul Scherrer Institute at the ARW11 in Cape town, 11-Apr-2011 Slide 7

  9. Availability: "Concours des Alpes” corrected Bare Availability [%] Year Andreas Lüdeke, Paul Scherrer Institute at the ARW11 in Cape town, 11-Apr-2011 Slide 8

  10. Special Events: ESRF 2005 and the Crotch Absorber • In March 2005 • A water-to-vacuum leak • Five days of user operation lost • 120 hours downtime • ESRF statistics 2005 • Availability 97.6%, • Total User Operation 5496 hours • 131 hours downtime • How can that be? • All users of 5 days re-scheduled • Not counted as downtime Andreas Lüdeke, Paul Scherrer Institute at the ARW11 in Cape town, 11-Apr-2011 Slide 9

  11. What can we learn from this? • Availability statistics not proportional to system reliability • But large effort spend to compile downtime statistics • Accurate failure data exists, but kept internal. Why? • If that would be public, what could it be used for? Andreas Lüdeke, Paul Scherrer Institute at the ARW11 in Cape town, 11-Apr-2011 Slide 10

  12. RF arcing at the Swiss Light Source • Background • SLS has 60 to 100 beam outages per year • About 20 outages were caused by RF arcs • Inquiry • Asking around at the EPAC’08: “What is your experience with arc detectors?” • Answer: arc detectors are often unreliable! • Action • We are replacing detectors with arc-coincidence detectors • Result • No arc interlock from any upgraded detector! • Single diodes still show arcs, but do not cause interlocks • Conclusion • We had in 10 years 200 unnecessary beam losses! Andreas Lüdeke, Paul Scherrer Institute at the ARW11 in Cape town, 11-Apr-2011 Slide 11

  13. What can we do? • What we do now • We do your own mistakes • Sometimes we share selected insights during workshops • What we should do • Learn from the failures of others • Create a database of all outages of many facilities! • How to do that? • Define a simple document format • Provide a web-platform to publish downtime event data • I’ll start, will you join? • Participate in the Friday morning discussion! • . • . Andreas Lüdeke, Paul Scherrer Institute at the ARW11 in Cape town, 11-Apr-2011 Slide 12

More Related