OPERATION STATIS TICS AND RELIAB ILITY OF THE KEK-PSH.Naka nishi and A. Takagi
Nation al Labora tory for High Energy Physic sAbstra ctApril 1971,The constr uction of KEK proton synchro tron. started in1976 andFor1976.
!1archindobtaine
wasbeam
ddesigne
and the firstwascycleweek
oneofrunthe1980, the number of runs were 88 times,
failureaverage
Thetimes.
40
wascycleweeks
twoitsand48 times
operati ng
hours was 6.3 %. In .recent runs, above 70 % of the total
The efficie ncy, the percen tage
time is used for Physic s experim ent.
was more than 80 %.
of actual beam houres for the schedu led opratio n timegroup was formed,
ions
operattheIt is four and half years sinceility hasreliabthewithted
connecs
recordthetimeand during that.
detailinthese
We report about
been collec ting.
of thisFig.l shows the operat ional status which became the aim
are
KEK-PS
theofility
reliabional
operat
The result s ofstudy.
There was a steady increas e in the reliab ility fromshown in Fig.2.
threeFig.3 shows the failure frequen cy for duty period in1979.
Fig.4 shows the relatio n of graded repair times to failure
shifts .
The failure frequen cy for repair time ofhour and its frequen cy.
But the ratio ofless than 5 min takes the greate r number of 60 %.
was only 8 %.
min
5
than
lessoftime
repairtheforhour
failurethe repair timetohour
failureoftion
On the other hand, the propor
the almostknow,
weasfor
As%.
46
about
was
min160to41ofn, the conlocatio
failuretheofing
searchinrepair time was spentFig.5 shows
nectio n to system specia list and the supplim ent of parts.
IC£K-PSOF
FACTSOPERATIOIIS
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bution by system
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