Proton Source Workshop

Booster DowntimeWednesday, December 8, 2010

T. Sullivan

Booster Downtime• Operators record machine downtime on D18. It is

from this information we get our data, along with our own recording of information not found on D18, i.e. periods during a scheduled or unscheduled downtime period required by another machine.

• Booster access often requires• A one hour cool down• A rad tech to accompany the work crew to

determine if additional measures are necessary. This is common for BRF work.

• Jobs are all entered into a worklist

Booster Downtime Over the Past Ten Years

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Data taken from D18

Summer Shutdown

Average 1.7% downtime

Summer Shutdown

Summer Shutdown

Average downtime 24 hours/month

Percentage of Booster Downtime Including ShutdownsJan 2010 - Nov 2010

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Average downtime 6.0 hours/month

Summer Shutdown

Booster RF Voltage (KV/T)(one year time span)

Major BRF Repairs

• 12/19/09 – BRF19 vacuum leak, ceramic• 06/08/10 – BRF3 vacuum leak, ceramic• 08/01/10 – BRF1 rear tuner water leak• 08/01/10 – BRF15 rear tuner water leak• 08/01/10 – BRF18 front tuner water leak• 08/18/10 – BRF5 sparking front tuner replaced

BRF19 Vacuum Leak

BRF19

BRF19 Cavity Failure – Dec 19, 2009• First cavity failure of this nature• Vacuum leak - beam off, valves close, access, leak check• Remove cavity from beam line• Insert spool piece, pump down, leak check• Rep rate reduced to preserve remaining cavities• 10.5 hours of downtime• Cavity repair requires written ALARA procedure, and supervision

of a radiation tech when any work is performed• After repair transport cavity to MI60 for testing• Cavity re-installed April 13, 2010• 10.5 hours of downtime for re-installation• ALARA total for BRF19 cavity repair - 170.5 mrem • Two months later…

BRF3 Vacuum Leak

BRF3

BRF3 Cavity Failure – June 8, 2010

• All the same steps as previously mentioned for BRF19 were performed

• 14.5 hours of downtime• Repaired and installed cavity on August 6

during the summer shutdown• ALARA total for BRF3 cavity repair - 362 mrem

BRF3 ceramic

BRF5 Front Tuner

• August 16, 2010• BRF5 tuner starting sparking, unable to run the

cavity. • Removed front tuner from the cavity and the

tunnel Aug. 18th

• Required a special lift fixture from MI60 to remove the tuner.

BRF5

BRF5 Tuner

BRF5 tuner stem connection

BRF Tuner Water Leaks• Prior to the 2010 summer shutdown we had three

BRF cavity tuners (BRF1, BRF15, BRF18) leaking water and an LCW valve. Although the majority of the water was leaking from BRF18 tuner.• This accounted for losing ~175 gallons of LCW per

day for three months.• If we decided not to run in this manner the

Booster intensity would have had to be reduced.• During the summer shutdown the three tuners were

repaired or replaced along with the LCW valve.

Reducing Booster Downtime• Tunnel components

• Replace existing plastic water tubing with more radiation hardened materials PEEK or Kynar

• Install components away from the beam line when possible, improving their lifetime

• Use improved vacuum seals to reduce vacuum leaks

• Newer corrector supplies improved reliability• Power supplies and controllers much more reliable• More readily available spares

• Proactive with maintenance• Regular maintenance on equipment

Summary• Booster has only 1.7 percent down time for 2010. • Much of this is due to the hard work of people that work on

and support the Booster.• Assure we have enough spare gradient magnets to support

future operations. • 75% of Booster downtime is due to BRF• To maintain present throughput Booster RF needs to remain

running consistently.• We need an ambitious program to replace or upgrade the

present BRF cavities which includes going to all solid state power supplies.

End Slide

Booster 95 LCW Make-upJanuary – July, 2010

Gal

Repairs to Booster Components Requiring ALARA

• 04/08 Replace MP02 - 918 mrem• 03/09 Period 6 vacuum leak - 233 mrem• 01/10 BRF19 vacuum repair - 170.5 mrem• 06/10 BRF3 vacuum repair - 362 mrem

Summer Shutdown

Hours of Booster Downtime Including ShutdownsJan 2010 - Nov 2010

Total Hours = 239