Brief Status Report on Fabrication

1
Brief Status Report on Fabrication Measurement
of ATF2 Quads

• By Cherrill Spencer, SLAC, for ILC-BDS weekly
  meeting on 31st January 2006

2
First ATF2 quadrupole, fully assembled
3
First ATF2 quad on measuring stand at IHEP.
Rotating coil set-up.
4
Whats happened 10-31st Jan 06

• 17 January - first magnet assembled
• 17-20 Jan Custom rotating coil system initially
  tested
• 23-24 January first magnet measured at IHEP by
  Hall probe moved through magnet.
• 25-27 January. Sugahara Masuzawasans of KEK
  visited IHEP to help develop standardization
  procedures, check out measuring system in general
  and verify that rotating coil is working
  properly.
• Conclusion of KEK visitors- more checks to be
  made of set-ups thermal stability and rotating
  coil data. Will happen after Chinese New Year
  holiday (IHEP closed 28Jan- 5Feb)
• If first quad looks OK production assembly will
  be given go-ahead.
• Spencer will visit IHEP 19-24 February to monitor
  fabrication and measurements

5
ATF2 quad Gradient versus current measured with
Hall Probe
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Summary of prelim measurement results on first
ATF2 quad at IHEP

• Magnet measured up to 150 amps.
• Effective length longer than predicted by usual
  rule of thumb and it decreases by 0.47 from 50
  to 135 amps.
• Average effective length over all currents
  19.849 cm
• Quad is 99.27 efficient at 50 amps
• Quad is 97.32 efficient at 100 amps
• Quad is 85.43 efficient at 135 amps
• With actual effective length and max K1 2.5 need
  gradient of 54.76T/m, which is achieved with
  136.2 amps
• Half the quads will need PS that go to 150 amps