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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
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 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 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
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.
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.
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