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Bending Magnets for the Metrology Light Source
P. Budz, M. Abo-Bakr, K. Bürkmann, V. Dürr, J. Kolbe, D. Krämer*, J. Rahn, G. WüstefeldBESSY GmbH, Berlin, Germany; * now at GSI, Darmstadt, Germany
R. Klein, G. Ulm Physikalisch-Technische Bundesanstalt, Berlin, Germany
I. Churkin, A. Batrakov, S. Belokrinitskiy, I. Ilyin, A. Philipchenko, E. Rouvinski, L. Schegolev, E. Semenov, S. Sinyatkin, A. Steshov, K. Zhilyaev Budker INP, Novosibirsk, Russia
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OUTLOOKStatus of MLS
Bending Magnet: view, requirements
Manufacturing: lamination, yoke, coils, support
Measurements:
• mechanical (technique, results)
• magnetic (technique, results)
Conclusion
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Metrology Light Source
Energy 200 - 600 MeV
Circumference 48 m
Current Lifetime
200 mA1 – 10 h
Bending magnetsQuadru/sextu/octu- poles
824 / 24 / 4
2008 - user operation
metrology and technology development in
UV and EUV
P.Budz … “Status of MLS”
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MLS SR Bending Magnets
Front view
Back view
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MLS SR Bending MagnetsNumber of magnets 8
Nominal Beam energy, MeV 600
Bending angle, deg 45
Bending radius, mm 1528
Gap, mm 50 ± 0.02
Identity of mean gap value from magnet to magnet, mm ± 0.02
Effective magnetic length, m 1.2
Field range, T up to 1.5
Good field area, mm2 60 x 36
Homogeneity dB/B 2.5x10-
4
Current, A 630
Power Consumption, kW 8
Weight, kg 6500
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Bending Magnets
SAGA dipole• smaller• 22.5 of bending angle
BESSY • straight dipole
ANALOGS
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Manufacturing
Lamination960 x 729.5
15 m for --- 50 m
Stamping by «Sibtekstilmash”
Novosibirsk
0.5 mm M940-50 (EBG, Bochum, Germany)
Stabolit 70 – end packs (100 mm)
Stabolit 20 – central part
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ManufacturingCombined technology:• 100 mm glued end packs• Welded central part
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Manufacturing
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ManufacturingThermal stress testing - for every 4th coil
20 cycles: 30 °C 95°C 30 °C
23.5 min duration of cycle
21 x 12 / 5 mm2 OFHC (Outokumpu)
14 windings in 2 layers6 “pancakes” (2 with trim coils)
Epoxy impregnation
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ManufacturingStand for Dipole
Shuttle distance - 370 mm
The tolerance of Dipole positioning is ± 0.2 mm
Pedestals for Dipoles
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average gap of dipoles
0,999
0,99925
0,9995
0,99975
1
1,00025
1,0005
1,00075
1,001
1 2 3 4 5 6 7 8 9 10 11
along axis
ga
p,
u.e
.
Mechanical measurementsGap Reference (± 0.02) Average magnet
Shim in, mm 48.611 48.600 ± 0.015
Middle, mm 50.000 50.005 ± 0.010
Shim out, mm 48.611 48.610 ± 0.015
“1” = 50 mm
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Mechanical measurements
Parameter Reference Measured average dipoleYoke length L, mm 11080.5 1108.265 ± 0.424 Distance between chamfers Lc, mm 10820.1 1081.925 ± 0.110 (10-4)
Sag, mm < 0.3 < 0.3Stacking factor, % 97 99.7 ± 0.2
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Magnetic measurements
Carriage with Hall probes in the guide mounted in the magnet
aperture
Magnetic field mapping in Cartesian coordinates by 2 runs (with parallel shift)
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Magnetic measurements
Carriage with the Hall probes 1 –temperature sensor, 2 –Hall probes,
3 – NMR probeDipole at the magnetic measurement stand (BINP)
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Magnetic measurements
Parameter B/B I /I
Spatial alignment (Hall probes, direction and linearity of carriage movement)
1.5.10-5 1.7.10-5
Temporal stability of *: BM`s excitation current Hall probe current
2.10-5
10-5
1.8.10-6
0.9.10-6
Temperature stability 2.4.10-5
Accuracy of Hall probe calibration 4.5.10-5
Electronics noise contributions 4.4.10-5 4.0.10-6
Resulting accuracy 7.2.10-5 6.2.10-5
Capability of magnetic measurement system
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Magnetic measurements
Magnetic field profiles in the central cross-section at B=1.3
T
-0,0006-0,0003
00,00030,00060,00090,00120,0015
-6 -4 -2 0 2 4 6Y, cm
dB
/B
calc
meas
Magnetic field profiles in the central cross-section at
B=0,21 T
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Magnetic measurements
Integral magnetic field profiles (measured and calculated at B=1.3 T)
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Magnetic measurements
Typical longitudinal profile (dipole #3) of the magnetic field (B0=1.3 T)
Integral = 1.5504 ± 0.0017 T.m (1.1.10-3)
B=1.3005 ± 0.0013 T (10-3)
E = 591.8 ± 0.7 MeV
Leff = 119.219 ± 0.068 cm (6.10-4)
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Magnetic measurements
Dependence of the effective length from excited current (measurement results for dipole #1 and calculation)
117,5
118,0
118,5
119,0
119,5
120,0
120,5
0,2 0,4 0,6 0,8 1,0 1,2 1,4 1,6magnetic field, T
Leff
, cm
meas
calc 0.98
calc uni
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Magnetic measurementsCalculation Measurement
Laminated
magnetLaminated
magnetSolid
magnetAverage magnet
Stacking factor (yoke laminations)
0.98 0.98 1.0 0.997
Curren.turns, A.turns 4297 26502 26502 26124
Magnetic field, T 0.212 1.305 1.305 1.301
Calculated particle energy, GeV
0.0968 0.5882 0.5956 0.5918 ± 0.0007
Effective magnetic length, cm
119.70 118.04 119.57 119.22 ± 0.07
Dipole h (1/m): 0.656 0.665 0.657 0.655
Quadrupole k (1/m2): -0.0188 -0.0293 -0.0271 -0.0239 ± 0.0010
Sextupole s (1/m3): -0.531 -0.809 -0.762 -0.7238 ± 0.0188
Octupole o (1/m4): -7.15 -9.95 -16.48 - 10.51± 1.43
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Conclusion
Produced Bending Magnets meet the requirements
Magnetic and mechanical measurements are correlated
Magnetic measurements confirm 3D modeling
Bending Magnets are being installed on the SR MLS
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ConclusionInternational Team
and Bending Magnet
at BINP Workshop
Bending Magnets
at MLS