MTE: Statistics of kickers faults Etienne Carlier, Luis Feliciano, Laurent Ducimetière, Brennan...

MTE internal review 1

MTE: Statistics of kickers faultsEtienne Carlier, Luis Feliciano, Laurent Ducimetière, Brennan Goddard, Luc Sermeus

19 October 2015

2

Estimation of fast failure rates for MTE kickers (faulty shots) and comparison with other system (KFA71-79)

Slow failure statistics

Impact of additional user cycles

Ageing effect & concerns

Outline

19 October 2015 MTE internal review

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System Number of pulses

(millions)

Faulty shots (spontaneous)

Fault rate per million pulses

KFA13-21, Gen #1 4.939 272 55

KFA13-21, Gen #2 5.890 758 130

KFA13-21, Gen #3 4.526 217 48

KFA 4, Gen #1 with east & TOF

5.6375.637

106381192

1900200

Main switchDump switch

KFA 4, Gen #1 MTE only (25 Sept)

0.1700.170

02

012

Main switchDump switch

For comparison :

KFA71-79 Total 90.135 4726 52Ratio Max/min

143KFA71-79 min 5.719 8 1.4

KFA71-79 max 4.548 914 200


Thyratron spontaneous triggering : beam losses, unclosed bump …

Estimation of fast failure rateNot detected before extraction

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KFA13-21 generators• HT50 Lemo connectors: 4 (switch to spare =1/2 days off)

1 man·day to repair

KFA4 generators• Magnet spark: 100, operation resume normally

Missing pulse; other possible cause• Timing error, or open contact in the timing chain• Thyratron trigger unit, or open contact in the triggering

chain

Estimation of fast failure rateNot detected before extraction


6

KFA13-21 generators• Capacitor unit: 2 (few hours off)• Charge Control unit: 9 (few hours off, now fixed)• HV Capacitor in PFN: 1 (switch to spare =1/2 days off)

4 man·week to repair

KFA4 generators• Thyratron: 2 (1/2 days off)• Thyratron bias unit: 2 (1/2 days off)• Charge Control unit: 1 (few hours off)• Accidental water in oil system: 1 (2 weeks off)

4 man·week to repair

Slow failure statisticsDetected before extraction


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Fast failure rate largely dependant of individual thyratron

Additional user cycles will increase fast failure:• Proportionally to number of shots• Additional fault due to varying the operational voltage

Impact of additional user cycles


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Limited components life time, depending of applied voltage• Thyratron, regularly changed (20 kCHF + 2 man.days)

require increasing adjustment effort with age(1 thyratron = 15% of PS kicker budget);

• Capacitors• Contacts• (Transmission cables)• (Step-up charge transformer)

Concerns• KFA 13-21: Adapted from design for short pulses • KFA 13-21: no spare• KFA 4 : one spare magnet module, no tank

Ageing effect & concerns


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Conclusion• Large range of statistics for fast failure rate • Additional users will increase fault rate more than

proportionally• Ageing effect can impact availability• No spare magnet / tank

Detailed implications to be defined (consolidation strategy, spares, controls, exploitation budget, manpower);

Justify maintaining the CT operational as fall back for the fixed target.


MTE: Statistics of kickers faults Etienne Carlier, Luis Feliciano, Laurent Ducimetière, Brennan...

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