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Overview of Linac Downtime and Proton Source Performance Analysis (2010)

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damon
11 diapositives · 258 Views · Jul 21, 2014

This workshop presentation by Fernanda G. Garcia analyzes Linac downtime statistics from 1977 to 2010, highlighting key findings on operational performance. Using data logged by the Operations Department, it reveals a total downtime of approximately 6,660 hours and an availability rate of 89.5%. The analysis focuses on recent trends in downtime, the impact of different system components, and risks associated with operational reliability. Notable failures and their contributions to downtime are discussed, emphasizing the importance of addressing environmental impacts and system maintenance.

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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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