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Supplemental Material: Data on Tevatron Complex Reliability

Supplemental Material: Data on Tevatron Complex Reliability. Elliott McCrory 25 February 2004. Presentation Outline. Main talk is elsewhere The data here are supplemental to that talk. Downtime Logger, D18. Console Application: Screen Shot. Web Page: 4 Weeks of Downtime. Click Here….

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Supplemental Material: Data on Tevatron Complex Reliability

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  1. Supplemental Material: Data on Tevatron Complex Reliability Elliott McCrory 25 February 2004

  2. Presentation Outline • Main talk is elsewhere • The data here are supplemental to that talk Reliability Data (Supplemental Material) – McCrory

  3. Downtime Logger, D18 Console Application: Screen Shot Reliability Data (Supplemental Material) – McCrory

  4. Web Page: 4 Weeks of Downtime Click Here… Reliability Data (Supplemental Material) – McCrory

  5. Entries like these are uses as the basis for the analysis Focus on one subsystem: BPS Reliability Data (Supplemental Material) – McCrory

  6. BDIAG BMAG BMISC BPS BRF BVAC BWATR CMISC CNET CR&LK CTIME EXPAR FDIAG FMISC FPS FWATR LDIAG LMAG LMISC LPS LRF LVAC LWATR MIDIAG MIMISC MIPS MIRF MISC MIVAC MIWATR MIMAG MIXFER Tevatron Complex Subsystems • NTF • PACC (L) • PBCOOL • PBDIAG • PBMAG • PBMISC • PBPS • PBRF • PBTRGT • PBVAC • PBWATR • PBXFER • POWER • RADTRIP • RRMISC • SAFETY • TCRYO • TDIAG • TMAG • TMISC • TPS • TQPM • TQUEN • TRF • TVAC • TWATR • WATER Reliability Data (Supplemental Material) – McCrory

  7. Definition of Terms • MTBF • Mean Time Between Failure • Simple arithmetic average of the time between failures • λ • Used to characterize the probability of an interval in the classic random queuing problem • E.g., the arrival interval of cars at a toll booth • λ = 1/<t> = 1/σ • Actually, not σ, but R.M.S. • Calculated here as (2/(MTBF + σ(MTBF))) • Average Downtime Fraction • = [Σ (time down)] / (specified interval) Reliability Data (Supplemental Material) – McCrory

  8. MTBF For Each Major System Running average over 30 days Linac Good Fall 2003 Shutdown Running average MTBF, hours Bad Running average over 120 days Days since 1/1/2003 Reliability Data (Supplemental Material) – McCrory

  9. MTBF For Each Major System Booster Good Running average MTBF, minutes Bad Days since 1/1/2003 Reliability Data (Supplemental Material) – McCrory

  10. MTBF For Each Major System PBar Good Running average MTBF, minutes A lot less downtime Bad Days since 1/1/2003 Reliability Data (Supplemental Material) – McCrory

  11. MTBF For Each Major System Main Injector Good Running average MTBF, minutes Bad Days since 1/1/2003 Reliability Data (Supplemental Material) – McCrory

  12. MTBF For Each Major System Tevatron Good Running average MTBF, minutes Bad Days since 1/1/2003 Reliability Data (Supplemental Material) – McCrory

  13. MTBF For Each Major System Controls Good Running average MTBF, minutes Bad Days since 1/1/2003 Reliability Data (Supplemental Material) – McCrory

  14. Tevatron as 2 Machines • The machines are called “Low Beta” and “Not Low Beta” • Is “Low Beta” if energy is bigger than 900 • Otherwise, it is called “Not Low Beta” • Only one machine exists at a time • Time between failures • Only count time in which the machine “exists” • That is, count minutes at 980 to determine time between failures at 980 • Ditto for “Not Low Beta” • Eliminate obvious bad points • E.g., 5000+ minutes of shutdown between failures at 150 for TeV this winter. Reliability Data (Supplemental Material) – McCrory

  15. Tevatron as 2 machines, MTBF MTBF is getting longer! Reliability Data (Supplemental Material) – McCrory

  16. λ(t) For Each Major System Linac Bad Running average MTBF, hours Running average over 30 days Good Running average over 120 days Days since 1/1/2003 Reliability Data (Supplemental Material) – McCrory

  17. λ(t) For Each Major System Booster Bad Running average MTBF, hours Good Days since 1/1/2003 Reliability Data (Supplemental Material) – McCrory

  18. λ(t) For Each Major System Main Injector Bad Running average MTBF, hours Good Days since 1/1/2003 Reliability Data (Supplemental Material) – McCrory

  19. λ(t) For Each Major System PBar Bad Running average MTBF, hours Good Days since 1/1/2003 Reliability Data (Supplemental Material) – McCrory

  20. λ(t) For Each Major System Bad Running average MTBF, hours Good Tevatron Days since 1/1/2003 Reliability Data (Supplemental Material) – McCrory

  21. λ(t) For Each Major System Controls Bad Running average MTBF, hours Good Days since 1/1/2003 Reliability Data (Supplemental Material) – McCrory

  22. Average Downtime Fraction Running average over 30 days Running average over 120 days Bad Linac Running average Downtime Duration, minutes Good Days since 1/1/2003 Reliability Data (Supplemental Material) – McCrory

  23. Average Downtime Fraction Booster Bad Running average Downtime Duration, minutes Good Days since 1/1/2003 Reliability Data (Supplemental Material) – McCrory

  24. Average Downtime Fraction Main Injector Bad Running average Downtime Duration, minutes Good Days since 1/1/2003 Reliability Data (Supplemental Material) – McCrory

  25. Average Downtime Fraction PBar Bad Running average Downtime Duration, minutes Good Days since 1/1/2003 Reliability Data (Supplemental Material) – McCrory

  26. Average Downtime Fraction Tevatron Bad Running average Downtime Duration, minutes Good Days since 1/1/2003 Reliability Data (Supplemental Material) – McCrory

  27. Average Downtime Fraction Controls Bad Running average Downtime Duration, minutes Good Days since 1/1/2003 Reliability Data (Supplemental Material) – McCrory

  28. Radioactive Decay λe –λ t is the frequency distribution of the classic random queuing problem F(t) = 2 -t/τ F(t) = 2 -t/τ = e -ln(2) t/τ ≡ e –λ t λ = 0.0346 <t> = σ = 1/ λ = 28.9 Reliability Data (Supplemental Material) – McCrory

  29. Controls Downtimes Data Dump of All Controls Downtimes since 1-1-2003 Reliability Data (Supplemental Material) – McCrory

  30. λ For All Systems Probability of failure per hour = 1 – λ E.g. Linac up for 5 hours: (1-0.183)5 = 0.364 Log Scale Reliability Data (Supplemental Material) – McCrory

  31. Quality of λ Fit Assumption Q = <t>/σ Reliability Data (Supplemental Material) – McCrory

  32. Store Duration Failures Intentional: 2003 dN / dT Intentional: 2004 Stores Duration, Hours Reliability Data (Supplemental Material) – McCrory

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