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Enhancements to the Muon Beam at ISIS for Improved Performance in Particle Physics Experiments

This document outlines the planned improvements and expected performance metrics of the muon beam facility at the ISIS synchrotron. Key advancements include an increased muon momentum range (150 to >450 MeV/c), improved momentum spread (0% to 20%), and enhanced muon intensity (>1000 μ/s). The facility operates at 800 MeV with a focus on cooling experiments utilizing significant rf power and shielding. The potential for a 75-fold increase in pion production at 450 MeV/c is discussed, along with strategies to reduce background and optimize muon yields.

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Enhancements to the Muon Beam at ISIS for Improved Performance in Particle Physics Experiments

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  1. 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 >450 MeV/c • Momentum spread - “0” to 20% • Background (pi/mu) - <1/1 • Muon intensity - >1000 μ/s Requirements:

  3. Note: rf pulsed at 50Hz, 100μs per pulse ISIS: • 800 MeV synchrotron; currently 160kW, next year 240kW • 50 Hz, >100μs 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! ISIS

  4. ISIS 800 MeV proton synchrotron 2.5  1013 proton per pulse 100 ns pulses at 50 Hz

  5. HEP Test Beam Target

  6. 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

  7. Measured rates • Rutherford Health Warning: • Different beam conditions • Some momenta tuned, others not 626 MeV; 40o

  8. Improvements 626 MeV 800 MeV Factor of 75 increase at 450 MeV/c!  60k pions/s at 450 MeV/c

  9. But what about muons? Without doing anything….. ~1100 muons/s at 300 MeV/c ~ 500 at 450 MeV/c but with big backgrounds

  10. With a decay solenoid….

  11. Other possible improvements Intensity currently limited by irradiation of ISIS  more shielding  better at 800 MeV anyway? Replace/improve target  particularly cooling

  12. Conclusions

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