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Positron Target Prototype - Status

Leo Jenner

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Overview

• The set-up

• Latest Simulation

• Project plan

• Progress

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ILC

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The plan is still the same…

• Sweep in parameter space of B-Field, Rotation Speed and Immersion (1 T, 2000 rpm, 50 mm)

• Observation of kicks as spokes traverse field

• Measurement of eddy currents by torque and direct heating ( Lei Zang: PhD student, Liv )

Additional support from Duncan Scott ( ASTeC )

• Study of rotor-dynamics (LLNL: accelerometers)

• Simulations from Jim Rochford (RAL) in parallel with LLNL

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B-field

00.20.40.60.81.0

Imm

ersi

on

Speed

2000 rpm

1500 rpm

1000 rpm

500 rpm

Carmen spoke model

Retarding torque predicted by CARMEN for 100rpm for a full revolution

90o

18o

162o

234o306

oAlignment at t=0

18o 90o 162o

234o

306o

Model results; full revolution

•Here we see the torque peaks correspond to each point a spoke crosses the –ve X axis i.e. when a spoke passes through the coil centres

rotation

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-3000

-2000

-1000

0

1000

2000

3000

4000

5000

6000

7000

8000

0 1 2 3 4 5 6

Nm

m

no field

field-on

carmen

carmen + friction

carmen + 'field friction'

no field max

field max

Conclusion

• I’m confident the experimental programme will be completed in the next 2 months

• PAC paper, NIM paper will follow

• Thank you and goodbye!