1. Test Result overview: Timeline, highlights and challenges H. Bajas TE-MSC-TF

2. HQ02b : Test result overview OUTLINE I.Magnet preparation II.Magnet cool-down and warm-up III.Magnet performance IV.High Miits test V.Conclusion

3. HQ02b : Test result overview I. Magnet Preparation Integration : No issues (in accordance with D. Cheng drawings). OK. Preparation of the 3 leads: tinplating, hardening and instrumented. OK. Instrumentations: Cryogenics Control  Nothing to declare. OK. Fiber Optic  Integration OK but no conclusive results Acoustic Sensor  Integration OK and coherent acquisitions Voltage Taps  PotAIM card OK, same taps as LBNL are lost (18/82) Strain Gauges  Issues (Agilent, connector swap, inversion Shell-Rod: OK ) HV test: Limited to 700 V: third current lead ground insulation weakness (test facility). Problem identified with the Impulse Test box urgently shipped. Outcome: One week of preparation to get cooling-down ready. Need people for in-house instrumentation setting (Maxim, Helene…)

4. HQ02b : Test result overview II. Magnet cool-down and warm-up Cooling longer that expected: investigation with CRG… Do we want to keep 50 K gradient? RRR measurement (warm-up): 20 % discrepancy… HQ01e vs. HQ02b 2.5 vs. 6.5 K/h

5. HQ02b : Test result overview III. Magnet performance Preliminary test (Thursday 27 th ): Vmax = 600 V Rdump = 120 m  Delay = 100 ms Threshold= 200 mV Provoked with IL, OL, CLIQ unit 1 and 2 RR=20 A/s I mag = 0, 3, 5 kA Natural quench RR = 350 A/s I mag = 3765 A (vs. 3500 at FERMI) Outcome: All signal look OK, PH and CLIQ worked as expected. One day of preliminary test.

6. HQ02b : Test result overview III. Magnet performance Training: 1 st part (28 th, 31 st, 1 st, 2 nd ) Vmax = 700 V Rdump = 30 then 40 m  Delay = 5 ms Threshold= 400 mV RR=50 up to 10 kA then 20 A/s to quench (later 10 A/s but no visible effect) Outcome: same starting point Training rate faster (~200 vs. ~50 A/quench ) Stop training to go to CLIQ test (time constrain)

7. HQ02b : Test result overview III. Magnet performance CLIQ test (2 nd, 3 rd, 4 th, 7 th ) CLIQ able to protect the magnet Time constrain: Could skip less relevant quench after first CLIQ experience skip all 16.5 kA test See Emmanuele’s presentation Outcome: One training quench with CLIQ as protection all energy goes into the bath pressure above 2 bar HeII opening to buffer Long time recovery Keep CLIQ for last quench of the day

8. HQ02b : Test result overview III. Magnet performance PH test (7 th ) Only 8 and 11 kA provoked quench (OL then IL) due to time constrain (no 9, 14.6 and 16.5 as scheduled). See Tiina’s and Vittorio’s presentation. Some 11kA extraction (High Miits test) are also useful for PH characterization.

9. HQ02b : Test result overview III. Magnet performance Training: 2 nd part (9 th, 10 th ) Two days to resume training. CLIQ test did not spoil the 1 st training. Mid-plane quench Pole-turn quench @ 1.9 K Imax=17271 A 95% Iss @ 4.3 K I = 15830 kA 95% Iss  FERMI = -270 A Coil 20 has the lowest Iss. Coil 20 is the limiting coil.

10. HQ02b : Test result overview IV. High Miits test Issue 1 With Natural quench, playing with the protection (EE & PH) delay cannot give Miits > 16. Magnet resistance growth > 100 m  (three coils quenching). The Power Supply cannot face voltage > 10 V and maintain constant current. Solution 1 Provoked quench at 11 kA with C16A2 (inner layer). Extend protection delay (OL PH and EE) 19 Miits obtain with 300 ms delay Issues 2 11kA approach limited to 19 Miits Solution 2 Provoked quench at 6kA with 650 ms approach limited to 21 Miits. Provoked quench at 6 kA with Spot Heater: 25 Miits

11. HQ02b : Test result overview IV. High Miits test Verification ramp with threshold 16.4 kA ( 5% less than maximum current)

12. HQ02b : Test result overview Conclusion  Magnet integration: need people to set-up the instrumentation (SG issue could have been avoided)  HV test: test facility issue with new third lead, to be confirmed tomorrow.  Test schedule was tight but we manage to cover most of it.  Cryogenics issues: ½ day (cold box issue) + ½ day (wrong handling of the valve).  Power Convertor issue: 1 day (switch connection loose)  Result:  95% of short sample  CLIQ test for the first time on Nb3Sn successful.  High Miits test:  Power Supply not powerful enough  Solution found at lower current and Spot Heater  Data analysis with CERN database and data diffusion to the plone on-going.  Before shipping back to US: HV test and Continuity. Withing next two weeks…

13. HQ02b : Test result overview Thank you for your attention.

14. HQ02b : Test result overview

17. I. Magnet Preparation

18. HQ02b : Test result overview Back-up Slides

19. HQ02b : Test result overview Back-up Slides

20. HQ02b : Test result overview Back-up Slides

21. HQ02b : Test result overview Back-up Slides

22. HQ02b : Test result overview Back-up Slides