MBSMH101 11T practise coil Collaboration meeting
description
Transcript of MBSMH101 11T practise coil Collaboration meeting
MBSMH10111T practise coil
Collaboration meeting
Gerard WilleringTE-MSC-TF 21-07-2014
on behalf of the test team: Jerome Feuvrier, Vincent Desbiolleswith thanks for support during test to Susana Izquierdo, Juho Rysti and Philippe Grosclaude
with thanks to everyone involved in the design and preparation of the coil that deserve the creditsnanos gigantum humeris insidentes
Content
Magnet parameters
Conductor parameters
Short circuit and instrumentation
Training and quench performance
Mechanical measurements
Quench heater efficiency
Magnet Parameters
Identification: MBSMH101Coil 101 – Copper coilCoil 105 – OST RRP 108/127, Ta-Doped
Coil ID: HCMBHSP0003_105 from billets 13925, 13926 Cabled at CERN, cabling run 86A Cable ID: H15OC0127A
Overview of the different design of magnet cross-sectionsThis coil has the CERN type Single-aperturs cross-section
Lots of info during 11T design review on: http://indico.cern.ch/event/273023/
10 kA
6.5 kA
13 kA
Magnetic Field
In the half-coil dipole configuration the outer blocks and Quench Heaters are in rather low field region.
Highest field is in the end turns.
Images by S. Izquierdo
Conductor Parameters
Reference: Internal note to be published, B. Bordini, A. Ballarino, A. Bonasia, L. Oberli, «Cable H15OC0127A for Coil 105 (11 T Magnet Project)»
Strand Type RRP 108/127, Ta-DopedBillets 13925, 13926
Max Ic(4.22 K, 12 T)** 480 AMin Ic(1.9 K, 12 T)** 466 A
Max RRR** 230Min RRR** 88
Transposition Pitch (mm) 100 Mid Thickness (mm) 1.2498 (= 0.0011)*
Width (mm) 14.715 (=0.0026)*
Keystone Angle 0.779° (=0.029)*
Number of Strands 40Core Width (mm) 12
Core Thickness (m) 25
Wire Caracteristics Cable Caracteristics
Similar cable as for SMC_11T coil #1 that had magneto-thermal instabilities
SMC_11T #1 MBSMH10148 hrs 210 °C 48 hrs 210 °C48 hrs 400 °C 48 hrs 400 °C50 hrs 650 °C 50 hrs 640 °C
KeystoneLower T should increase RRR and lower Ic
Measured RRR of full coil 77
Rectangular
Short sample and load line
Reference: Internal note to be published, B. Bordini, A. Ballarino, A. Bonasia, L. Oberli, «Cable H15OC0127A for Coil 105 (11 T Magnet Project)»Loadlines calculated by S. Izquierdo using Roxy.
0 2 4 6 8 10 12 14 160
10
20
30
40
50
60
VAMAS 1 - XS, 1.9 KVAMAS 2 - XS, 1.9 KParam. XS, 1.9 KVAMAS 1 - XS, 4.3 KParam. XS, 4.3 KVAMAS 2 - XS, 4.3 KLoadline Roxie 2D w SFLoadline Roxie 2D wo SFLoadline Roxie 3D w SFLoadline Roxie 3D wo SF
Magnetic field [T]
Cab
le c
urre
nt [k
A]
2 sets of Vamas witness samples measured.
Load lines calculated
Resulting short sample current limits:4.3 K: 15.15 kA ± 1 %1.9 K: 16.69 kA ± 1 %
Variation inbetween 2 samples about 300 A.
Uncertainties on loadline Field modulus is usedTheoretical position of the coil is used3D loadline will be re-evaluated
Cooldown
0
50
100
150
200
250
300
0 10 20 30 40 50
Tem
pera
ture
(K)
Time (hours)
Temperature first cooldownT_bottom
T_top
Inner coil
Outer coil
Rather fast cooldown in 45 hours with a ΔT between top and bottom of the yoke of 100 K.Temperature in the coil (calculated from ρ) follows closely the top temperature.
Short circuit in the coil? First ramp of the magnet led to trip at 2.5 kA. Suspicion of a short circuit in the coil
Jumps in total voltage and inner layer voltage during discharge after the quench
2.52.62.72.82.9
33.13.23.33.43.5
0 1 2 3 4 5
Indu
ctan
ce (m
H)
Current (kA)
Ramp up
Ramp down
Only 3.3 mH instead of 3.8 as was calculated!Strong jumps in voltage from 1 to 3 kA
Only normal behavior: Time constant and inductance during energy extraction: coil inductance around 3.8 mH.
2.2
2.25
2.3
2.35
2.4
2.45
2.5
2300
2305
2310
2315
2320
2325
2330
2335
2340
12.22 12.24 12.26 12.28
Volta
ge (V
)
Curr
ent (
A)Time (s)
I_MEAS
V_MEAS
Changes in load on Power ConverterConclusion: No short between turns, but shorts through instrumentation.Post mortem investigation started last Friday.
Inductive voltage on coil not equal to resistive voltage in the dump (6 kA, no quench)
Instrumentation – outer layer
12 outer layer voltage taps2 outer layer heaters
Instrumentation – Inner layer
15 inner layer voltage tapsMany signals for investigation of events !!
Training Quench performanceTraining at 4.3 K up to 14.3 kA
First quench at 9 kA
After 5 quenches at “nominal” 11.8 kA
After 16 quenches 11 T in the coil ends
Most training quenches seem to initiate in the coil ends, but in both inner and outer layer.
Layer Voltage taps1 Inner I13-I142 Outer O02-O033 Inner I13-I144 Inner I03-I045 Inner I06-I076 Inner I03-I047 Outer O05-O068 Inner I09-I109 Outer O07-O0810 Outer O02-O0311 Outer O02-O0312 Outer O03-O0413 Outer O06-O0714 Outer O03-O0415 Inner I10-I1116 Outer O05-O0617 18 Outer O07-O0819 Inner I11-I1220 Inner I13-I1421 Outer O07-O0822 Outer O04-O0523 Inner I10-I1124 Outer O07-O0825 Inner I02-I0326 Outer O07-O0827 Outer O07-O0828 Inner I14-I1529 Inner I03-I0430 Outer O07-O0831 Outer O07-O0832 Inner I04-I0533 Outer O07-O0834 Outer O07-O0835 Outer O07-O0836 Outer O07-O0837 Inner I14-O0238 Outer O07-O0839 Outer O07-O0840 Inner I07-I0841 Inner I09-I1042 Inner I02-I0343 Outer O07-O0844 Outer O07-O0845 Inner I09-I1046 Outer O06-O0747 Outer O07-O08
“Holding quenches”: no quench during 40 minutes at 15 kA at 1.9 K.
6.5
7.3
8.1
8.9
9.7
10.5
11.3
12.1
12.9
13.8
14.6
8000
9000
10000
11000
12000
13000
14000
15000
16000
17000
18000
0 10 20 30 40 50
Mag
netic
fiel
d in
the
pole
end
s (T)
Curr
ent (
A)
Quenches
Training quenches 11T practise model - mirror configuration single coil
4.3 K, 10 A/s
Short sample 4.3 K
1.9 K, 10 A/s
Short sample 1.9 K
1.9 K, 50 A/s
Thermal cycle
Comparison SMC 11T_2
SMC 11T_2 and 11T practise coil are made from the same cable.
SMC 11T_2 suffered from conductor instabilities at 1.9 K between 14.1 and 16 kA.
11T practise coil seems to have a “smooth training” up to 16 kA.8000
9000
10000
11000
12000
13000
14000
15000
16000
0 10 20 30 40 50
Curr
ent (
A)
Quench number
Comparison 11 T practise coil with SCM11T_2
4.3 K, 10 A/s
1.9 K, 10 A/s
1.9 K, 50 A/s
4.3 K SMC 11T_2
1.9 K, SMC 11T_2
Comparison with MBHSM01 tested at FNAL
Single coil versus magnetic mirrorCERN coil has a higher I_ss
7000
8000
9000
10000
11000
12000
13000
14000
15000
16000
17000
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Cur
rent
(A)
Quench number (-)
4.3 K, 10 A/s
1.9 K, 10 A/s
1.9 K, 50 A/s
Plots for comparison, but between two coils with different characteristics.
0.5
0.55
0.6
0.65
0.7
0.75
0.8
0.85
0.9
0.95
1
0 10 20 30 40 50
I/Is
s (-)
Quench number
Comparison training quenches FNAL mirror to CERN 11T practise coil
CERN 4.3K Ic=15560 A
CERN 1.9 K Ic=17270 A
FNAL 4.3 K Ic=13000 A
FNAL 1.9K Ic= 14514 A
Mechanical Measurements LaboratoryM.Guinchard/P. GrosclaudeMechanical measurements
Reference: https://edms.cern.ch/file/1352279/1/11T_results.pptxhttps://edms.cern.ch/file/1387744/1/11T-2_Measurements_on_the_instrumented_collar_packs_report.pdf
Capa Gauge size 120 by 15 mm
Strong fluctuations seen from 15 to 16 kA. Needs further explanation
Pole wedge compression stressesRamp to 16 kA
0255075
100125150175200225250275300325
Initial 686 t ofcharge
Welding 4.2K 293K 4.2K 1.9K 293K
Stre
ss (M
Pa)
Bottom Shell - Traction Stress
Shell_0
Shell_1
Shell_2
Shell_3
FEA Results
Good correlation calculations with measurements on traction stress in the shell in the different stages of coil life.
Many probes did not perform as expected, instrumentation is already revised for the next coil.
Quench Heater studies
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60
70
80
90
0 2 4 6 8 10 12 14
Que
nch
dela
y (m
s)
Current (kA)
I_QH = 150 A, T = 1.9 KQuench heater response time within calculated range, except at 14 kA
Calculations by S. Izquierdo
Resistance growth comparison between model and measurements is progressing
0
20
40
60
80
100
120
5 7 9 11 13 15
Que
nch
dela
y (m
s)
Current (kA)
150 A - 1.9 K
100 A - 1.9 K
80 A - 1.9 K
150 A - 4.3 K
Quench Heater studies
QH delay at 4.3 K is very consistent up to 14 kA.
QH delay at 1.9 K is very fast at 13 and 14 kA, faster than at 4.3 K.
Confirmed for multiple cases
Cannot be explained with “normal” heat transfer from heater to coil.
In addition the quench starts in interlayer jump, far from Quench heaters
Small benefit in resistance growth, but not an effect to count on for protection.
Quench Heater studies
Resistive voltage in the coil at 1.9 K following QH discharge
Large set of data acquired for model validation and futher QH efficiency studies
Resistive voltage different coil blocks at 12 kA at 1.9 K
Example 1 Example 2
Preliminary conclusions
- Good training performance up to 16 kA, 13 T- Very good memory after thermal cycle- No “Holding quenches”- No degradation during testing- Quench heater delays as expected- QH efficiency studies is work in progress, in the right direction
Gives a good motivation to keep on going….
End of presentation