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FNAL Linac Downtime Overview Proton Source Workshop Fernanda G. Garcia Accelerator Division

FNAL Linac Downtime Overview Proton Source Workshop Fernanda G. Garcia Accelerator Division Proton Source Department December 7-8, 2010 fgarcia@fnal.gov X 3798. Few points you need to know... Data presented in this talk was obtained using the Operations Department

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FNAL Linac Downtime Overview Proton Source Workshop Fernanda G. Garcia Accelerator Division

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  1. FNAL Linac Downtime Overview Proton Source Workshop Fernanda G. Garcia Accelerator Division Proton Source Department December 7-8, 2010 fgarcia@fnal.gov X 3798

  2. Few points you need to know... • Data presented in this talk was obtained using the Operations Department • Downtime Logger (1977 is the earliest year logged) • Data was analyzed exporting data into excel file and filtering entries • Legend Linac Downtime Proton Source Workshop Fernanda G. Garcia December 7-8, 2010

  3. Linac Downtime History 2000-2010 TLD: ~ 3,470 hrs CD: 11.0% Linac Availability : 89% NuMIslipstacking Jan’08 Pbar stacking Aug’04 MiniBooNE April’02 NuMI May’05 Linac Downtime Statistics Proton Source Workshop Fernanda G. Garcia December 7-8, 2010

  4. Linac Downtime History 1977-2010 TLD: ~ 6,660 hrs CD: 10.5 % Linac Availability : 89.5 % Linac Downtime Statistics Proton Source Workshop Fernanda G. Garcia December 7-8, 2010

  5. Linac Downtime History Comparing the past decade with the previous 2 decades • Data shows that • 52% TLD happened in the past decade • Linac RF systems contributed 0.5% more to the CD in the past decade than it did in the previous 23 years • HE ~ 42% contribution • 1 single failed contributed ~11% of HE downtime (KRF1 replacement) • LE ~ 58% contribution Linac Downtime Statistics Proton Source Workshop Fernanda G. Garcia December 7-8, 2010

  6. Linac RF System ~ 60% 200 MHz system TLD ~ 40% 805 MHz system TLD LRF2 LRF4 LRF5 LRF3 LRF1 Linac Downtime Statistics Proton Source Workshop Fernanda G. Garcia December 7-8, 2010

  7. Linac RF System Modulator contribution LD ~ 57% Driver contribution LD ~ 35% Despite the fact the majority of the modulator downtime is < 30 min, these frequent interruptions to running a smooth program, occupy manpower resources with local response, frequent tuning and constant attention to Linac beam quality. They are also a repeated stress on the system hardware. Avg: ~ 45 min Avg: ~4.5 hrs Avg: ~ 10 min Linac Downtime Statistics Proton Source Workshop Fernanda G. Garcia December 7-8, 2010

  8. Linac Downtime Concerns • 200 MHz QPS • 20 uF 1kV capacitors with 1.6 lb PCB oil • 12 capacitors/supply ~ 120 supplies • Major downtime risk due to environmental impact and extensive of cleaning on other components which will get affected by this failure. • Currently replacing the PCB with non-PCB caps • Ignitron in the Modulator Capacitor bank • Hg -> environmental problem if it explodes • Drift Tube Failure • Historical fact: 5 quadrupole failures over Linac Operations • Tank 2: • 3 failures, all caused by ground fault in the magnet. • Tank 5 • 2 failures initiated by water leak in the stem box • Typically is possible to adjust other magnets (isolation transformer) • Multiple failures, problem becomes more challenging and perhaps • Impossible to sustain operations until magnets are replaced. Linac Downtime Statistics Proton Source Workshop Fernanda G. Garcia December 7-8, 2010

  9. Pre-Accelerator Downtime System During the past 10 years 11.5% TLD 1.2% CD H-system (6.7% TLD, 0.7% CD) I- system (3.3% TLD, 0.4% CD) • Largest Single Downtime • 2006 • 26 hrs: Short on the H- • extractor. I- turn on/tune up. • 2010 • 52 hrs: H- source repair. • I- column under repair and H- source died • Operation Risks • Haefely failure • lack of experience • Overall lack of experience • past 2 years Dept. lost 120 years • of expertise/experience • Loss of redundancy Linac Downtime Statistics Proton Source Workshop Fernanda G. Garcia December 7-8, 2010

  10. Pre-Accelerator Downtime System During the past 33 years ~ 15% TLD ~ 1.5% CD • Largest Single Downtime • 1983 • 15 hrs: I- source replacement • 1993 • 22 hrs: H- generator died Reliability is a concern for instance in 1988 there was no single failure. The downtime was a combination of small power supply trips, regulation issues which caused interruption to a smooth running. Downtime (hrs) Linac Downtime Statistics Proton Source Workshop Fernanda G. Garcia December 7-8, 2010

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