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

Cooling Experiment Muon momentum- 150 to >450 MeV/c Momentum spread- 0 to 20% Background (pi/mu)- 1000 /sRequirements:

ISIS Note: rf pulsed at 50Hz, 100s per pulseISIS: 800 MeV synchrotron; currently 160kW, next year 240kW 50 Hz, >100s 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 100s Target in ring could see 50MW for cooling experiment!

HEP Test Beam Target

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 beinginvestigatedPlanned improvements: Dip at 800 MeV Reduce capture angle(?) Add decay solenoid

Measured ratesRutherford Health Warning: Different beam conditions Some momenta tuned, others not626 MeV; 40o

Improvements626 MeV800 MeVFactor of 75 increase at 450 MeV/c! 60k pions/s at 450 MeV/c

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

With a decay solenoid.

Other possible improvementsIntensity currently limited by irradiation of ISIS more shielding better at 800 MeV anyway?Replace/improve target particularly cooling

Conclusions