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Brief Status Report on Fabrication & Measurement of ATF2 Quads

Brief Status Report on Fabrication & Measurement of ATF2 Quads. By Cherrill Spencer, SLAC, for ILC-BDS weekly meeting on 31 st January 2006. First ATF2 quadrupole, fully assembled. First ATF2 quad on measuring stand at IHEP. Rotating coil set-up. What’s happened: 10-31 st Jan ‘06.

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Brief Status Report on Fabrication & Measurement of ATF2 Quads

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  1. Brief Status Report on Fabrication & Measurement of ATF2 Quads By Cherrill Spencer, SLAC, for ILC-BDS weekly meeting on 31st January 2006 ATF2Quad Fab & Measurement Status Cherrill Spencer 01/31/06

  2. First ATF2 quadrupole, fully assembled ATF2Quad Fab & Measurement Status Cherrill Spencer 01/31/06

  3. First ATF2 quad on measuring stand at IHEP. Rotating coil set-up. ATF2Quad Fab & Measurement Status Cherrill Spencer 01/31/06

  4. What’s 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 & Masuzawa–sans 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-up’s 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 ATF2Quad Fab & Measurement Status Cherrill Spencer 01/31/06

  5. ATF2 quad Gradient versus current measured with Hall Probe ATF2Quad Fab & Measurement Status Cherrill Spencer 01/31/06

  6. 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 ATF2Quad Fab & Measurement Status Cherrill Spencer 01/31/06

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