ILCLike High Availability Power Supplies

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ILC-Like High Availability Power Supplies Paul
Bellomo and Briant Lam
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Objective and Conclusions
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Glossary of Terms and Definitions
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Analysis References and Basis

• References
• 1. Diamond Light Source
• Under construction so no empirical Availability
  data, no reliability studies or analysis
• 450 power supplies are redundant 4/5
  configuration.
• 2. SPEAR 3 and PEP power supply operation MTBF
  gt100,000 hours, MTTR 2 hours
• 3. Argonne Laboratory, APS, 2000 power supplies,
  MTBF gtgt 100,000 hours, MTTR 1 hour
• 4. EMI-Lambda, IE Power, Power Ten power supplies
  MTBF gt 100,000 hours
• 5. MTBF of switchmode power supply or bulk power
  supply is 110,000 hours based on Cherrill Spencer
  SLAC studies spanning several years
• 6. MTBF of a single power module is 220,000
  hours based on parts count method
• 7. MTBF PS controllers is 288,889 hours per PAC
  2001 reliability paper
• 8. MTBF cables is 2,600,000 hours per PAC 2001
  reliability paper
• 9. MTTR is 4 hours, 2 hours for repair and 2
  hours for beam recovery
• 10. When redundancy is considered it is Active
  redundancy (all backup supplies are running)
• No replacement and energized replacement during a
  run are also compared
• 4000 subsystems, 2000-1/2, 1000-2/3, 500-3/4,
  500-4/5

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Availability Improvement By Oversizing and
Redundancy
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Availability Improvement By Oversizing and
Redundancy
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Availability Improvement By Oversizing and
Redundancy
S
S
F
3 Cases
S
S
F
S
S
F
S
S
S
1 Case
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Availability Improvement By Oversizing and
Redundancy
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Availability Improvement By Oversizing and
Redundancy
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Availability Improvement By Oversizing and
Redundancy - An Example
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Availability Improvement By Oversizing and
Redundancy
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4000 Non-Redundant Power Supplies
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Rack and Power System Layouts
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Systems and Subsystems
1/2 200 systems 2000 subsystems 2/3 100 systems
1000 subsystems 3/4 100 systems 500
subsystems 4/5 100 systems 500 subsystems
System
Subsystem
Subsystem
10 or 5 subsystems per system
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Analysis for 1 / 2 and 2 / 3 Subsystems
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Analysis for 3 / 4 and 4 / 5 Subsystems
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Availability Calculation for 4000 m / n Subsystems
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Availability of 4000 Non-Redundant Vs Redundant
Modular PS
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Availability of 4000 Non-Redundant Vs Redundant
Modular PS
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Availability of 4000 Non-Redundant Vs Redundant
Modular PS
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Availability of 4000 Non-Redundant Vs Redundant
Modular PS
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Conclusions

• The SLAC-proposed redundant, modular power
  systems show significantly greater availability
  than the non-redundant systems
• Hot replacement of the power modules alone does
  not yield a large availability improvement. Other
  components must also be redundant.
• ATF2 potentially will use redundant power
  systems. The ILC will definitely need redundant
  systems