Analysis of MBXW and MBW Per Hagen (TE/MSC) 29.09.2009 Acknowledgements: R. Wolf (2008 analysis), G....
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Transcript of Analysis of MBXW and MBW Per Hagen (TE/MSC) 29.09.2009 Acknowledgements: R. Wolf (2008 analysis), G....
Analysis of MBXW and MBW
Per Hagen (TE/MSC)29.09.2009
Acknowledgements:R. Wolf (2008 analysis), G. de Rijk (ROXIE model),
B. Auchmann (ROXIE support), E. Todesco (discussions),BINP (Novosibirsk) and CERN personnel involved in measurements
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Function in LHC• Classical NC-magnets needed where SC-magnets would quench due to radiation• MBXW (2 beams in one aperture) are used for separating / combining the beams in ATLAS and CMS (194 – 224) mm. 6 MBXW = optics element D1. MBXW=29.• MBW (2 separate apertures) are used for changing the beam separation (194-224 mm) in cleaning regions where we have collimators (IR3, IR7). IR3: 3 MBW = optics elements D4 + D3. IR2: 2 MBW = D4 + D3. MBW=24.• Designed by CERN. Produced by BINP (Budker Institute of Nuclear Physics)
MBXW MBW
3
CERN
> 5000 KMBINP
4
Measurements
• First magnet measured with NMR for absolute calibration• Each magnet measured at BINP with HALL probe array• 19 probes along horizontal axis • Calibrated with NMR* measurement to give the B*L integral• Longitudinal scan step: 2 cm• MBXW aperture measured: ± 45 mm• MBW each aperture measured: range ± 60 to ± 148 mm
(center 194 mm sep = 97 mm, 224 mm = 112 mm) • FiDeL REFPARM: Use only BL from center of each aperture
Could have taken actual slot into account (center of beam as function of s)
• Rotating coil measurements after delivery to CERN giving B(I) and harmonics in central position: MBXW 1, 9, 20 + MBW 1, 9, 15
* NMR = Nuclear Magnetic Resonance. Constant magnetic field affects nuclear E + spin states. Measure wavelength of emitted photons in measuring device which is scales with B field.
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How results are presented
• Geo-gamma @ 100 A is removed• All data points converted to units of geo-gamma• Why? Compare and fit shapes of B(I), BL(I) curves
Facts• We use only the FIDEL residual magnetisation and saturation components for the “warm” magnets
• Assume local B(I) curves from “middle of magnet” have same shape as BL(I) curves
• LHC operational ranges: MBXW 41 to 643 A (0.08 – 1.3 T) MBW 43 to 685 A (0.08 – 1.3 T)
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MBXW TF
-800
-700
-600
-500
-400
-300
-200
-100
0
100
0 200 400 600 800
MB
XW
1 T
F (
unit
s)
Current (A)
TF local NMR
TF local RC3
TF local RC5
TF HALL INT
All 4 measurements of MBXW 1
Modest, flat “resmag” around 30, 40AGeo-gamma 100A
RC with 50 units less saturation
7
Statistics of 3 RC measurements Statistics of 29 HALL measurements
Individual geo-gamma per circuit
Conclusion:Less difference in saturation RC wrt HALL!
I (A) TF ave (units) TF sigma (units)
30 6.49 3.9440 -2.80 13.36
100 0.00 0.00150 7.06 3.01200 5.70 2.86300 5.42 1.60
400 -0.53 2.33500 -11.98 2.28600 -42.99 7.65650 -107.05 21.96700 -229.19 33.21750 -397.25 38.69800 -593.39 39.97830 -718.41 38.90
I (A) TF (Tm / A) TF ave (units) TF sigma (units)
100 0.00655273 0.00 7.32
500 0.00653464 -27.60 3.84750 0.00627223 -428.06 14.05830 0.00606208 -748.77 15.80
CIRCUIT TF (Tm / A) TF (units)
RD1.LR1 0.00655124 -7.9RD1.LR5 0.00655370 -4.1RBXWH.L8 0.00656430 12.0
Average 0.00655641Stdev 10.6
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MBXW resmag (2009 feature)• The RC measurements include measurement of remanent field at 0 A as 1st measurement after pre-cycles to stabilise B(I) curve, B(0) = 10 G• Assume TF(I) at low current given by “geometric” + remanent allows to make an initial resmag table (expressed in units of geometric)• Assume remanent field measurement contains an absolute error, and the condition that resmag @ I_geo_gamma vanishes• Use the 2 “calibrated” values for TF fit @ 30, 40 A
I (A)uncalibrated calibrated
10 524 47220 262 21030 175 12240 131 7950 105 5260 87 3570 75 2280 66 1390 58 6
100 52 0
TF resmag (units)
Used for FIDEL resmag fit
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MBXW TF fit
-1000
-800
-600
-400
-200
0
200
0 200 400 600 800
TF
(uni
ts)
Current (A)
TF FiDeL
TF ROXIE
ave local meas
AVG HALL INT
ROXIE has much less saturationbased on residual magnetization
FIDEL fit where HALL measurements given more weight
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MBXW TF REFPARM and fit error
-30
-20
-10
0
10
20
30
40
0 200 400 600 800
Res
idua
l err
or (u
nits
)
Current (A)
Component Parameter Value
Saturation sigma 0.00073092I0 790.3871s 4.4855Inomref 690
Residual mag rho 0.00002553r 3.3434Iinjref 43
Component Parameter Value
Saturation sigma 0.00077631I0 791.7549s 4.2487Inomref 690
Residual mag rho NAr NAIinjref NA
2008
2009
Conclusion:Resmag only essentialdifference!
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MBXW harmonics (3 magnets)I (A) b2 a2 b3 a3 b4 a4 b5 a5 b6 a6 b7 a7 b8 a8 b9 a9 b10 a10 b11 a11
ave 40.0 -0.2 -0.2 0.1 0.0 0.0 0.0 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0stdev 0.1 0.2 0.3 0.0 0.0 0.0 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
ave 500.0 -0.2 0.0 0.0 -0.1 0.0 0.0 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0stdev 0.1 0.1 0.3 0.1 0.0 0.0 0.1 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
ave 750.0 -0.2 0.0 -0.4 -0.1 0.0 0.0 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0stdev 0.1 0.1 0.3 0.1 0.0 0.0 0.2 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
ave 830.0 -0.3 0.0 -0.9 -0.1 0.0 0.0 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0stdev 0.1 0.1 0.3 0.1 0.0 0.0 0.2 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Conclusion:Only b2 visible but -0.2 units is too small and uncertain for REFPARM
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MBW TF
All measurements of MBW 1
-700
-600
-500
-400
-300
-200
-100
0
100
0 200 400 600 800
MB
W 1
TF
(un
its)
Current (A)
TF local NMR
TF local RC3 ap1
TF local RC5 ap2
TF HALL INT
Modest “resmag” around 30, 40A
Geo-gamma 100A
All 4 measurements of MBW 1
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Statistics of 2x3 RC measurements Statistics of 24 HALL measurements
Individual geo-gamma per circuit
Conclusion from HALL:No difference between apertures
I (A) TF ave (units) TF sigma (units)
30 12.01 4.9140 -3.14 5.45
100 0.00 0.00150 4.08 2.98200 5.83 4.78300 5.95 3.90
400 1.04 1.19500 -11.42 2.82600 -38.33 3.51650 -82.23 6.43700 -184.03 9.41720 -244.10 14.13
750 -347.41 17.37810 -589.74 20.17
Conclusion:RC always less saturation similar to MBXW
Aperture I (A) TF (Tm / A) TF ave (units) TF sigma (units)
1 100 0.00692104 0.00 4.14
1 500 0.00690243 -26.90 3.831 720 0.00672390 -284.84 14.151 810 0.00648078 -636.13 20.682 100 0.00692110 0.00 3.852 500 0.00690242 -27.00 3.312 720 0.00672368 -285.26 14.282 810 0.00648070 -636.33 20.42
CIRCUIT TF (Tm / A) TF (units)
RD34.LR3 0.00692176 0.3RD34.LR7 0.00692141 -0.3
Average 0.00692158Stdev 0.4
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MBW TF fit
FIDEL fit where HALL measurements given more weight
-800
-600
-400
-200
0
200
400
600
0 200 400 600 800
TF
(uni
ts)
Current (A)
TF FiDeL
ave local meas
AVG HALL INT
Based on residual magnetization like for MBXW
1515
MBW TF REFPARM and fit error
2008
2009
Conclusion:Resmag only essentialdifference!
-40
-30
-20
-10
0
10
20
30
30 230 430 630 830
Res
idua
l err
or (u
nits
)
Current (A)
Component Parameter Value
Saturation sigma 0.00161642I0 896.2477s 3.5510Inomref 720
Residual mag rho 0.00004589r 2.4698Iinjref 41
Component Parameter Value
Saturation sigma 0.00167790I0 900.9500s 3.5982Inomref 720
Residual mag rho NAr NAIinjref NA
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MBW harmonics (3 magnets)
Conclusion:Use geometric for b3, b5, b7 same sign both apertures
Ap I (A) b2 a2 b3 a3 b4 a4 b5 a5 b6 a6 b7 a7 b8 a8 b9 a9 b10 a10 b11 a11
ave 1 40.0 0.3 0.1 1.5 0.0 0.0 0.0 -0.4 0.0 0.0 0.0 -0.3 0.0 0.0 0.0 -0.1 0.0 0.0 0.0 0.0 0.0stdev 1 1.8 0.1 0.4 0.1 0.4 0.0 0.3 0.0 0.4 0.1 0.2 0.0 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0
ave 1 600.0 0.7 0.1 1.3 0.0 -0.1 0.0 -0.3 0.0 0.0 0.0 -0.3 0.0 0.0 0.0 -0.1 0.0 0.0 0.0 0.0 0.0stdev 1 1.6 0.3 0.4 0.1 0.5 0.0 0.3 0.1 0.4 0.1 0.2 0.1 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0
ave 1 810.0 1.5 0.2 -0.5 0.0 -0.2 0.1 -0.6 0.0 0.1 0.0 -0.3 0.0 0.0 0.0 0.0 0.0 -0.1 0.0 0.1 0.0stdev 1 1.3 0.2 0.8 0.2 1.0 0.1 0.3 0.1 0.4 0.1 0.2 0.1 0.2 0.0 0.1 0.0 0.1 0.0 0.1 0.0
ave 2 40.0 -0.5 0.0 1.4 0.0 0.0 0.0 -0.4 -0.1 0.1 0.0 -0.3 -0.1 0.1 0.0 -0.1 0.0 0.0 0.0 0.0 0.0stdev 2 1.8 0.1 0.5 0.1 0.5 0.1 0.2 0.1 0.5 0.1 0.2 0.1 0.2 0.1 0.0 0.0 0.0 0.0 0.0 0.0
ave 2 600.0 -0.7 0.0 1.3 0.0 0.1 0.1 -0.3 0.0 0.0 0.1 -0.3 -0.1 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0stdev 2 1.6 0.1 0.5 0.2 0.5 0.1 0.2 0.2 0.4 0.2 0.2 0.1 0.2 0.1 0.1 0.0 0.1 0.0 0.1 0.0
ave 2 810.0 -1.4 0.2 -0.4 -0.1 0.3 0.1 -0.5 -0.1 0.0 0.0 -0.2 -0.1 0.1 0.0 0.0 0.0 0.1 0.0 0.1 0.0stdev 2 1.1 0.2 0.8 0.3 0.8 0.2 0.2 0.1 0.3 0.2 0.2 0.1 0.2 0.1 0.2 0.0 0.2 0.0 0.1 0.0geo 1.4 -0.4 -0.3