Proton Source Workshop

Booster Current Beam OperationTuesday, December 7, 2010

T. Sullivan

Current HEP OperationsNormal HEP Time Line• Running 23 cycle for MI

• 2 Pbar events + 9 Numi events + 3-4 MiniBooNE events• Booster rep rate is 7 Hz, this includes two initial non-beam

cycles to pulse power supplies prior to the beam cycle(s)

• Extracted beam intensity per cyclePbar - 4.5E12 (11T)

Numi - 4.2E12 (10T)MB - 5.0E12 (12T)

• Beam efficiencies are normally 90%

Typical $23 Injection Cycle into Main Injector and MiniBooNE

$14$19

$1D$14

$19

Booster Normalized Losses

Booster Radiation Survey

Allocation of Protons Delivered in 2010

Numi - Total Protons

MiniBooNE Protons on Target

Booster Integrated Proton Delivery 1994-2010

Booster Charge Comparison – 2000 to 2010

Higher Throughput and Higher Efficiency

2000 2010

12T12T

Radiation Concerns• Radiation damage to tunnel components

• Cables, hoses, HV insulators, vacuum seals become brittle• Replacing components more frequently

• Increased above ground activation - shielding• Long 6 location above ground, west towers• Additional shielding required or move people

• Additional exposure to workers• One hour cool down time before Booster accesses• Repairing tunnel components exposes technicians to increased radiation doses• ALARA planning for any type of repair > 100 mrem

Annual Radiation Exposure for Proton Source Department 1998-2009

Booster Limitations - Shielding

• Booster beam ~1.00E17 protons/hour (pph)• MCR warning limit 1.09E17 pph• Operational limit 1.22E17 pph• Beam permit 1.35E17 pph

• 8GeV beam to Main Injector ~6.70E16 pph• MCR warning limit 7.91E16 pph• Operational limit 8.6E16 pph• Beam permit 9.6E16 pph

Beam Budget Monitor

Aging Components + Radiation + Increased Rep Rate = Reduced Lifetime + Increased Downtime

• BRF cavities, tuners, and power supplies are 40 years old• Experiencing more cavity and tuner failures• In some cases the cavity must be removed from the

tunnel and repaired with limited spare parts• Repairing this equipment often requires a written

ALARA procedure, and supervision of a rad tech• Current Booster rep rate is limited to 7Hz

• Gradient magnets with limited spares, interlock cables, water hoses, vacuum seals, all of which are affected by radiation

Additional ConcernsBeam Loss, Instabilities, and Beam Quality

• Damper system helps reduce beam instabilities• Notching systems reduce extraction losses• Collimators help remove halo at injection• Newer correctors help us tune up the ramp at higher

currents for better beam control• Daily tuning in MCR to maintain in beam quality

• MB, Numi, Collider, and Pbar production

• The bottom line is better beam efficiency means lower losses

Summary

• Booster is running well with 90% or better efficiency. If this running continues we should reach 6.0E20 protons for the calendar year! • A record year that included a six week shutdown!

• Limitations that still need to be addressed for a long term future:• Booster RF cavities and power supply reliability• Radiation shielding improvements• Tunnel activation of components• Aging of Booster components

End Slide Show

Spare Slides

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

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 – BRF18 rear tuner water leak• 08/01/10 – BRF15 front tuner water leak• 08/18/10 – BRF5 sparking tuner replaced

Booster 95 LCW Make-upJanuary – July, 2010

BBM Toroid Reference List