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HQM02 Test Status: Preliminary Check-Out, Quench Training, and Ramp Rate Study

This report provides an overview of the HQM02 test, including the coil-to-pole piece short found, quench training at 4.6 K and 2.2 K, ramp rate study at 4.6 K, and splice measurements. The test status and quench history are also included.

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HQM02 Test Status: Preliminary Check-Out, Quench Training, and Ramp Rate Study

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  1. Preliminary check-out Sep. 6-9 • Coil-to-Pole piece (LE) short was found • Quench training at 4.6 K Sep.12, 13 • Short developed between the OL heaters and coil • Quench training at 4.6 K Sep. 21, 22 • Ramp rate study at 4.6 K Sep. 23, 27 • Splice measurements Sep. 27 • Quench training at 2.2 K Sep. 28, 29 HQM02 Test Status

  2. HQ coil #13 in a mirror structure • Same preload was applied as in HQM01 (~ -130 MPa after assembly) • 0.8-mm Nb3Sn strand of RRP 54/61 sub-element design • More room provided for expansion during the heat treatment (1-turn short cable) • Larger longitudinal gap between pole pieces Shim system in HQM02

  3. Short Sample Estimate

  4. HQ coil in a mirror structure Pos. Lead Outer Neg. Lead Vadim Kashikhin

  5. HQM02 Quench History 91% of SSL 88% of SSL 4.6 K 2.2 K

  6. HQM02 Quench History

  7. Ramp rate dependence

  8. HQM02 SG data: cool-down Temp vs. Date/Time Temp vs. Data point

  9. HQM02 SG data: cool-down Coil Azimuthal SG Coil Axial SG

  10. HQM02 SG data: cool-down Axial SG on Bullets: LE Axial SG on Bullets: RE

  11. HQM02 SG data: cool-down Shell az. SG at 60 deg. Shell az. SG at 90 deg. 60 60

  12. HQM02 SG data: Excitation Coil Azimuthal SG Coil Axial SG

  13. HQM02 SG data: Excitation Axial SG on Bullets: LE Axial SG on Bullets: RE

  14. HQM02 SG data: Excitation Shell az. SG at 60 deg. Shell az. SG at 90 deg.

  15. Coil azimuthal SG in HQM02 and HQM01: Excitation

  16. TQ/TQM peak fields TQM TQC

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