18-20 December 2006

3rd ATF2 Meeting, KEKATF2 Power Supplies 1

Power Supply Summary

• PS Controller– Provide 10 ppm current regulation

– New Local Control Board

18-20 December 2006

3rd ATF2 Meeting, KEKATF2 Power Supplies 2

Power Supply Summary• Power Supplies

– OCEM - N+1 Redundant

Power Modules– Provide 50 – 200 A to magnets

• Schedule: Install in Spring 2008– Wait for finalized ATF2 commissioning schedule

for exact power supply commissioning dates– May be commissioned in two parts depending on

KEK schedule and preference

18-20 December 2006

3rd ATF2 Meeting, KEKATF2 Power Supplies 3

Power Supply Summary

Power Supply Rack& all internal components

(SLAC)

Cable Tray and Cables (KEK)

AC Distribution

100V & 400V(KEK)

Main Control(KEK)

6 x 400VAC circuits @100A9 x 100VAC circuits @20A

AC, DC, Interlock, & Control Cables

Software to PS Controller by KEK with some help from SLAC(drivers, source code, etc.)

18-20 December 2006

3rd ATF2 Meeting, KEKATF2 Power Supplies 4

Magnetic Field Stability (M. Kumada)

18-20 December 2006

3rd ATF2 Meeting, KEKATF2 Power Supplies 5

Magnetic Field Stability (M. Kumada)

18-20 December 2006

3rd ATF2 Meeting, KEKATF2 Power Supplies 6

Magnetic Field Stability (M. Kumada)• Under good air conditioning, the amplitude of

the magnetic field is strongly correlated with coil temperature.

• The observed temperature coefficient of the iron core electromagnet is about +14 ppm/degree. It is positive and can not be explained by the standard Bloch theory.

• Note hysteresis effect is larger than the temperature effect. We would monitor B magnet and Q magnet by the NMR.

• Local thermal insulation is economical and recommended.