Jan '09 Positron Target Status 1

Positron Target Prototype - Status

Leo Jenner

Jan '09 Positron Target Status 2

Overview

• Then

• Now

• Simulations

• Thermal Calibration

• Project plan

• Outstanding Issues

Jan '09 Positron Target Status 3

ILC

Jan '09 Positron Target Status 4

Jan '09 Positron Target Status 5

Jan '09 Positron Target Status 6

• Magnetic simulations at DL

• Vector Fields Opera with Elektra rotation solver

• Magnet modelled as two coils

• Calculate expected power losses from eddy currents as wheel rotates, and resistive force this generates

• Spoked modelling taking place at RAL ( J. Rochford )

Jan '09 Positron Target Status 7

Jan '09 Positron Target Status 8

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 )

• Study of rotor-dynamics (LLNL: accelerometers)

Jan '09 Positron Target Status 9

Torque measured

480 revolutions per minute reached so far

Jan '09 Positron Target Status 10

1st data with magnet on! ( 300 rpm , 0.1T )