Presentation on theme: "Proton Source Workshop Booster Downtime Wednesday, December 8, 2010 T. Sullivan."— Presentation transcript:
Proton Source Workshop Booster Downtime Wednesday, 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
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. 18 th 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.