Booster

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Booster AGS Modifications and g-2 Beam
Requirements

• Kevin A. Brown
• C-AD
• kbrown_at_bnl.gov

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Introduction g-2 Past Performance
FY97 FY98/99 FY2000 FY2001 New
Energy (GeV) 24 24 24 24 24
bunches/pulse 6 6 12 12 12 or 24
Rep. Time (sec) 3.6 2.5 2.5 2.5 2.7
Intensity (protons/pulse) 46 x 1012 58 x 1012 61 x 1012 63 x 1012 60 x 1012
Average Availability /Best Week 58 67 55 83 74 87 83 88 60 60
Integrated Intensity ( protons) 0.13 x 1020 0.48 x 1020 0.5 x 1020 0.6 x 1020 1.3 x 1020
Assumes concurrent operation with RHIC.
Based on 1600 hrs data collection period 500
hrs setup.
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Introduction Past Performance
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Booster AGS Performance

• Imposed limits to lost beam power to maintain
  hands-on maintenance (ALARA).
• AGS FEB operation, 2.77 s cycle AGS cycle time, 6
  Booster cycles
• Achieved 30 Tp/sec, Booster Late 22 Tp/sec, AGS
  Late
• Table 3 FEB 10 Pulse Ave. Data (best
  performance, not sustainable operation)

Intensity (Tp/cycle) Efficiency () Beam Loss (Tp/cycle) ALARA (Tp/cycle) Loss (kW) Loss/m (W/m)
Linac 115 - - - - -
Booster Injected 89 77 27 27.7 0.31 1.5
Booster Extracted 83 93 6 9.2 0.33 1.6
AGS Injected 66 78 18 16.3 2.0 2.5
Before Transition 62.3 94 3.7 1.5 0.9 1.1
After Transition 61.6 99 0.6 2.3 0.2 0.2
AGS Late 61.4 99.5 0.3 0.8 0.25 0.3
assumed lost in AGS
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Slow Extraction and Switchyard Modifications

• Main Issue Aging access controls system.
• Has impact on g-2 operation due to high
  intensity beams
• Requires significant technical support and
  maintenance
• For high intensity operation as many as 8 to 10
  chipmunks are required to monitor radiation
  levels outside the shielding areas, due to the
  configuration of the shielding and the
  possibility of extracted particles.
• Switchyard, A target cave, and old B target area
  are required to be secured and monitored.
• Solutions
• Add beam plugs to Ring area of Switchyard, to
  allow for an SEB safely off switch.
• Remove the AD2 magnet and replace with shielding
  (this would require moving the NASA experiments
  to another area of the Switchyard)
• Possibly add or modify shielding to minimize
  areas that need to be swept and secured.