bending magnets for the metrology light source
DESCRIPTION
Bending Magnets for the Metrology Light Source. P. Budz, M. Abo-Bakr, K. Bürkmann, V. Dürr, J. Kolbe, D. Krämer * , J. Rahn, G. Wüstefeld BESSY GmbH, Berlin, Germany ; * now at GSI, Darmstadt, Germany R. Klein, G. Ulm Physikalisch-Technische Bundesanstalt, Berlin, Germany - PowerPoint PPT PresentationTRANSCRIPT
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
OUTLOOKStatus of MLS
Bending Magnet: view, requirements
Manufacturing: lamination, yoke, coils, support
Measurements:
• mechanical (technique, results)
• magnetic (technique, results)
Conclusion
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”
MLS SR Bending Magnets
Front view
Back view
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
Bending Magnets
SAGA dipole• smaller• 22.5 of bending angle
BESSY • straight dipole
ANALOGS
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
ManufacturingCombined technology:• 100 mm glued end packs• Welded central part
Manufacturing
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
ManufacturingStand for Dipole
Shuttle distance - 370 mm
The tolerance of Dipole positioning is ± 0.2 mm
Pedestals for Dipoles
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
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
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)
Magnetic measurements
Carriage with the Hall probes 1 –temperature sensor, 2 –Hall probes,
3 – NMR probeDipole at the magnetic measurement stand (BINP)
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
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
Magnetic measurements
Integral magnetic field profiles (measured and calculated at B=1.3 T)
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)
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
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
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
ConclusionInternational Team
and Bending Magnet
at BINP Workshop
Bending Magnets
at MLS