Rob Edgecock

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• A Muon Beam using ISIS
• Dean Adams, Paul Drumm, Rob Edgecock, Paul
  Flower, Ruth Hampton, Ash Jamdagni and Ken
  Long
• Current HEP test beam
• Planned improvements
• Expected performance
• Conclusions

2

• Cooling Experiment

• Muon momentum - 150 to gt450 MeV/c
• Momentum spread - 0 to 20
• Background (pi/mu) - lt1/1
• Muon intensity - gt1000 µ/s

Requirements
3

• ISIS

Note rf pulsed at 50Hz, 100µs per pulse
ISIS

• 800 MeV synchrotron currently 160kW, next year
  240kW
• 50 Hz, gt100µs at close to maximum energy, 800
  MeV ? ISIS is cw for cooling experiment!
• 2 bunches, each 100ns long, separated by 230ns
• Each makes 200 turns during 100µs
• Target in ring could see 50MW for cooling
  experiment!

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HEP Test Beam Target
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HEP Test Beam

• Capture at 40o
• Beam dipped at 626 MeV
• About 25m long
• Lots of rf-power
• Lots of space
• Lots of cooling, cryo being investigated

Planned improvements

• Dip at 800 MeV
• Reduce capture angle(?)
• Add decay solenoid

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Measured rates

• Rutherford Health Warning
• Different beam conditions
• Some momenta tuned, others not

626 MeV 40o
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Improvements
626 MeV
800 MeV
Factor of 75 increase at 450 MeV/c!
? 60k pions/s at 450 MeV/c
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But what about muons?
Without doing anything.. 1100 muons/s at 300
MeV/c 500 at 450 MeV/c but
with big backgrounds
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With a decay solenoid.
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Other possible improvements
Intensity currently limited by irradiation of
ISIS ? more shielding ? better at 800 MeV
anyway? Replace/improve target ? particularly
cooling
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Conclusions