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

Test Result overview: Timeline, highlights and challenges

H. BajasTE-MSC-TF

HQ02b : Test result overview

OUTLINE

I. Magnet preparation

II. Magnet cool-down and warm-up

III. Magnet performance

IV. High Miits test

V. Conclusion


I. Magnet PreparationIntegration:

• 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…)


II. Magnet cool-down and warm-up

Segments CERN BNL FERMI LBNLVCoil15 73 89 75 86 15% -3% 13%VCoil16 86 105 95 98 12% -8% 3%VCoil17 117 158 130 147 20% -7% 12%VCoil20 127 153 135 155 18% 1% 13%

% vs. LBNL

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



Preliminary test (Thursday 27th ):

• Vmax = 600 V• Rdump = 120 mW• 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.



Training: 1st part (28th, 31st, 1st, 2nd )

• Vmax = 700 V• Rdump = 30 then 40 mW• 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)



CLIQ test (2nd , 3rd, 4th, 7th)

• 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



PH test (7th)

• 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.


III. Magnet performanceTraining: 2nd part (9th, 10th)• Two days to resume training.• CLIQ test did not spoil the 1st training. Mid-plane

quenchPole-turn quench@ 1.9 K

Imax=17271 A95% Iss

@ 4.3 K

I = 15830 kA95% IssDFERMI = -270 A

Coil 20 has the lowest Iss.Coil 20 is the limiting coil.


IV. High Miits testIssue 1• With Natural quench, playing with the protection (EE & PH) delay

cannot give Miits > 16.Magnet resistance growth > 100 mW (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


IV. High Miits test

Verification ramp with threshold 16.4 kA ( 5% less than maximum current)


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…


Thank you for your attention.





I. Magnet Preparation


Back-up Slides

Insulations Tests Performed Date Temp Temp Steps Voltage Time

Humidity [V] [min]

21-Mar-14 23.3C Warm Magnet Ground 50031% On Insert Magnet QH 20A,15B 500

Magnet QH 17C,16D 500QH 20A,15B Ground 500QH 17C,16D Ground 500

21-Mar-14 23.3C Warm Magnet Ground 50031% On Cryo

26-Mar-14 1.9K Cold Magnet Ground 500On Cryo Magnet QH 20A,15B 1000

Magnet QH 20A,15B 1500Magnet QH 17C,16D 1500QH 20A,15B Ground 1000QH 17C,16D Ground 1000Spot Heater Magnet 500Spot Heater Ground 500

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Back-up Slides


Back-up Slides


Back-up Slides


Back-up Slides

Documents

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