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LM02 test at 4.5K/2.1K

LM02 test at 4.5K/2.1K. Training/Ramp rate study at 4.5K Training/Ramp rate study at 2.1K Continue testing at 4.5K RRR measurement. LM02 Quench History. 4.5K. 2.1K. 4.5K. 64 quenches in total: 36 at 4.5K 28 at 2.1K Mostly ramp rate study. Quench Locations.

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LM02 test at 4.5K/2.1K

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  1. LM02 test at 4.5K/2.1K Training/Ramp rate study at 4.5K Training/Ramp rate study at 2.1K Continue testing at 4.5K RRR measurement

  2. LM02 Quench History 4.5K 2.1K 4.5K 64 quenches in total: 36 at 4.5K 28 at 2.1K Mostly ramp rate study

  3. Quench Locations Most of high ramp rate data show signal in both inner and outer layers Data was lost for quenches #6 and #41: reasons which caused the problem are under investigation, plan to replace vxworks logger node

  4. Quench Locations (cont’d) High MIITs were observed at the beginning of test - AQD/DQD thresholds were set to 0.1V Low quench current at high ramp rates - Pre-conditioning ramps helped to reach higher quench currents • High Ramp Rates: • signal development in both inner and outer layers, so some times hard to • detect the quench • - quench # 21 (see next page) • Regular Ramp Rates: • For many quenches in the inner layer we see some activity in the • mid.plane segment of the outer layer • For quenches in outer layer we never see activity in the inner layer

  5. Quench Protection Failure in quench #21 Ramp rate 300A/s, quench Developed in both inner and Outer coil layers

  6. Ramp Rate Study High ramp rate quenches w/o pre-conditioning ramps: - signal develops in both layers

  7. Quench #61 with ramp rate 175A/s Spikes are seen at -1.3s and -0.16s Always DQD triggered quenches DQD is balanced at 500A

  8. Ramp Rate Study (cont’d) Test: Ramp to 5000A with ramp rate 50A/s and then ramp to quench at different ramp rate

  9. LM02 vs LM01: noise in splices

  10. LM02 vs LM01: noise in half-coils

  11. LM02 quench onsets -6 msec -20 msec Quench #36, inner layer Iq=16.5kA, 2.2K Quench #9, outer layer Iq=15.6kA, 4.4K

  12. LM02 quench onsets (cont’d) All leads in quench # 8 Quench #8, Iq=16.3kA 11LEL-11LER, -5 msec

  13. LM02 Field Map

  14. More tests 16535A 16834A 16963A 16695A 15727A 14kA @ 20A/s 16118A 13kA 12kA 11kA 10kA 9kA 8kA Quench #56: ramped to 15kA, quench after 5min on flat-top Quench #60: more than 10min on flat-top, did not quench

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