IR Superconducting Magnets
N. Ohuchi
KEK

2014/3/3

SuperKEKB ARC 2014

1

Contents
1. Production status of SC magnets
2. Production of quadrupole magnets
3. Production of correctors
4. Schedule
5. Summary

2014/3/3

SuperKEKB ARC 20142

Production status of magnets
1. All superconducting coils for the quadrupole magnets havebeen completed.
•••

Production of the first coil for QC1LP started from June 11, 2013.
The last coil for QC2RE was completed at January 16, 2014.
Total number of the coils is 32.

2. Collaring process of the QC1LP quadrupole magnet started fromJanuary 22, 2014.
••

Collaring processes of QC1LP, QC2LP, QC1LE and QC1RE were completed.
The collaring processes of all quadrupole magnets will be completed inMarch 2014.

3. Correctors and cancel coils for the left side have been
completed in February 2014.
4. Production of correctors and cancel coils for the right side has
started.
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SuperKEKB ARC 20143

Production of quadrupole magnets
1. SC coil production
The SC coils of four type quadrupole magnets were wound with 5 sets of jigs andtools.

–•–

2014/3/3

While QC2LEand QC2RE have the same cross section, the lengths were different.

After winding the coils, the coils are cured to the design shape with the forming
blocks at temperature of 130 degree C and pressure of 20 MPa.

SuperKEKB ARC 20144

Production of quadrupole magnets•

QC1LP: 5 coils were built from 11 June 2013 ~ 17 July 2013.
–––•

The first coil was for training the technicians in Mitsubishi.
The third coil had a damage of the electrical insulation in the SC lead during acuring process. The damaged part was repaired.
The tools for the curing process was improved.

QC1LE: 4 coils were built from 26 June 2013 ~ 11 July 2013, and the
5th coil was built from 9 October 2013 to 15 October 2013.
–The SC cable in the 1st coil had a damage during a curing process. The coil wasscrapped.

QC1LP 3rd coil

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QC1LE 1st coil

SuperKEKB ARC 20145

Production of quadrupole magnets•

QC2LP: 5 coils were built from 10 September 2013 ~ 17 October 2013.
––•••
•
•

The first coil was for training the technicians in Mitsubishi because the magnet
had a large aperture.
The 5th coil had a damage of the electrical insulation by the metal flakes fromthe screw hole. The damaged part was identified and repaired with epoxy resin.

QC2LE : 4 coils from 20 September 2013 ~ 4 October 2013.
QC1RP: 4 coils from 19 November 2013 ~ 28 November 2013.
QC1RE: 4 coils from 2 December 2013 ~ 7 December 2013.
QC2RP: 4 coils from 16 December 2013 ~ 25 December 2013.
QC2RE: 4 coils from 8 January 2014 ~ 16 January 2014.
QC2LP coil surface

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SuperKEKB ARC 2014

6Production of quadrupole magnets
lengthLength: distance between the end spacers
Thickness: two layer coil (1st layer and 2nd layer)
STD: standard deviation of four coils

Coil shape

QC1LP

QC1LE

QC2LP

QC2LE

Length, mm (Average, STD)
(Design)384.00, 0.044(384.0)429.98, 0.041(430.0)470.02, 0.019(470.0)593.05, 0.012(593.0)Thickness, mm (Average, STD)
(Design)5.418, 0.006(5.425)5.425, 0.003(5.425)5.419, 0.003(5.425)5.415, 0.005(5.425)

QC1RP

QC1RE

QC2RP

QC2RE

Length, mm (Average, STD)
(Design)

383.98, 0.006(384.0)429.92, 0.010(430.0)470.02, 0.014(470.0)535.05, 0.070(535.0)Thickness, mm (Average, STD)
(Design)5.423, 0.002(5.425)5.418, 0.002(5.425)5.420, 0.007(5.425)5.413, 0.006(5.425)

Coil shape

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SuperKEKB ARC 20147

Production of quadrupole magnets
Machining of coil ends
̶

̶

̶

̶

The four coils are aligned with the magnet end plates with keys.
The end plates are aligned of the support bobbin of the correctors with another keys.
The support bobbin has the alignment keys to the cryostat.
The mating surface (V-groove) center is required to be coincident with the coil center
axis within ±12µm for QC1P.

± 0.0125 mm= ± 1 mrad

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Production of quadrupole magnets
Machining of coil ends
̶ Machining of coil ends was performed with the rotating blade.
̶ The blade shape was shaped to the angle of 90 degree, and the blade surfaces have evenly
the angle of 45 degree with respect to the plane including the top parts of the rotating blades.
̶ The coil was assembled on the special mandrel for this process to have a precise alignment tothe blade.
̶ The blade position was decided from the mandrel.
̶ This process started from August 2013, and the machining method within the required
precision was confirmed at December 25, 2013.
SC coil on the mandrel

SC coilBlade

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Rotatingblade

SuperKEKB ARC 2014

V-groove on the coil end

9Production of quadrupole magnets

Measurement of the shape of V-groove on the coil ends

̶ At the beginning of the machining process, the shape of V-groove was measured by the 3D
shape measurement instrument with manual operation.
• The number of sampling points is limited, and the G10 material of coil ends was the combined material with epoxy andglass fiber.
• Machining surface was not flat like metal.
• The measured data did not have repeatability.

̶ Appling the newest type of 3D measurement instrument• With a kind collaboration of Japanese company (Mitsutoyo), we had a technical service for measuring the shape of Vgroove.
• The machine was operated with the automatic scanning of the surface with the sampling span of 2.3 µm. The resolutionof the machine is 0.1 µm• The measured data were over 1000 points, and the data were processed statistically.
• The accuracy and repeatability of the measured offset between the coil center axis and the V-groove center weremeasured with the ultimate precision.

Old type of
3D shape
measurement
instrument
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SuperKEKB ARC 2014

Newest type of
3D shape
measurement
instrument
10

Production of quadrupole magnets
Collaring process of four coils
Collared QC1LP magnet after the 1st collaring

Collaring press and the QC1LP magnet
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SuperKEKB ARC 2014

Coils for QC1RP magnet

11

Production of quadrupole magnets
Completed collared magnets
QC1LE & QC1REQC1LP & QC2LP
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SuperKEKB ARC 201412

Production of quadrupole magnets• QC1E proto-type test results––

The sextupole error field at the level of 10-3 to the quadrupole field was measured.
Sextupole correctors were introduced into the magnet system in the right side.

• Fields of the collared magnets are measured at Mitsubishi.
–

2014/3/3

When the amplitude of the sextupole field exceeds 10-3 w.r.p. the quadrupole field,
the magnet is disassembled and the collaring process will be conducted again.

SuperKEKB ARC 2014

Presented at SuperKEKB ARC 201313

Production of quadrupole magnets
Field measurement at Mitsubishi•

Field measurement system (Harmonic coil)̶̶The system measures the integral field of the magnet.
Harmonic coil length = 997.989 mm
Harmonic coil radius = 14.5 mm
Turn number of the coil = 100̶̶•Magnet current at the measurement＝±1A̶̶•Design current at nominal operation = 1625A
The signal was magnified 200000 times larger with the pre-amplifierplus amplifier in the integrator.

The field measurements were performed with the dipoleand quadrupole bucking process.

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SuperKEKB ARC 201414Production of quadrupole magnets
Field measurement results:QC1LP
QC1LP field quality after collaring@ R = 14.5 mm@ R = 10 mm

Design @ R= 10 mm

an

bnan

bnan

bn

n=1

0.00

0.00

0.00

0.00

0.00

0.00

2-0.00

10000

0.00

10000

0.00

10000

3-3.16

0.89

-2.18

0.61

0.00

0.00

4

1.32

-1.22

0.63

-0.58

0.00

0.24

5

1.07

-0.31

0.35

-0.10

0.00

0.00

6-0.39

0.45

-0.09

0.10

0.00

0.54

7-0.27

0.14

-0.04

0.02

0.00

0.00

8-0.04

-0.38

-0.00

-0.04

0.00

0.01

9-0.01

0.05

-0.00

0.00

0.00

0.00

10

0.07

-2.03

0.00

-0.10

0.00

-0.21

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SuperKEKB ARC 201415

Production of quadrupole magnets
Field measurement results:QC2LP
QC2LP field quality after collaring@ R = 14.5 mm@ R = 30 mm

Design @ R = 30 mm

an

bn

an

bn

an

bn

n=1

0.00

0.00

0.00

0.00

0.00

0.00

2

0.00

10000

0.00

10000

0.00

10000

3-0.21

-0.05

-0.43

-0.11

0.00

0.00

40.03

-0.18

0.12

-0.77

0.00

-0.06

5-0.11

0.06

-1.00

0.50

0.00

0.00

60.01

0.00

0.23

0.01

0.00

0.28

70.05

0.03

1.97

1.29

0.00

0.00

80.02

0.04

1.36

3.38

0.00

0.11

90.02

0.02

3.38

3.06

0.00

0.00

10-0.03

0.00

-9.92

0.93

0.00

-1.43

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SuperKEKB ARC 201416

Production of quadrupole magnets
Field measurement results:QC1LE
QC1LE field quality after collaring@ R = 14.5 mm@ R = 15 mm

Design @ R = 15 mm

an

bn

an

bn

anbn

n=1

0.00

0.00

0.00

0.00

0.00

0.00

20.00

10000

0.00

10000

0.00

10000

30.27

0.89

0.28

0.92

0.00

0.00

40.47

-0.23

0.50

-0.25

0.00

-0.02

5

0.07

-0.02

0.08

-0.02

0.00

0.00

6-0.02

-0.01

-0.03

-0.02

0.00

-0.04

7

-0.02

0.02

-0.02

0.02

0.00

0.00

8

-0.02

-0.04

-0.02

-0.05

0.00

-0.42

9-0.02

-0.00

-0.03

-0.00

0.00

0.00

10

-0.07

-0.08

-0.10

-0.10

0.00

0.05

2014/3/3

SuperKEKB ARC 201417

Production of quadrupole magnets
Field measurement results:QC1RE
QC1RE field quality after collaring@ R = 14.5 mm@ R = 15 mmDesign @ R = 15 mm

an

bn

an

bn

an

bn

n=1

0.00

0.00

0.00

0.00

0.00

0.00

2

0.00

10000

0.00

10000

0.00

10000

3

1.06

-1.09

1.10

-1.13

0.00

0.00

4

-0.10

-1.34

-0.11

-1.44

0.00

-0.02

5

-0.10

-0.14

-0.11

-0.15

0.00

0.00

6

0.18

-0.16

0.21

-0.19

0.00

-0.04

7

0.06

0.02

0.07

0.03

0.00

0.00

8

0.01

-0.02

0.01

-0.03

0.00

-0.42

9

-0.00

0.06

-0.00

0.08

0.00

0.00

10

-0.14

-0.16

-0.18

-0.21

0.00

0.05

2014/3/3

SuperKEKB ARC 201418

Production of quadrupole magnets• Four magnets (QC1LP, QC2LP, QC1LE and QC1RE) are
accepted for the next step in the assembly process.
• Assembly of QC1LP and correctors into one unit:– The assembly is scheduled from 17 March, 2014 at Mitsubishi.
– The mid-planes and magnetic centers of the QC1LP and corrector fields
are measured.
– The cold test of the assembled magnet will be performed in April at KEK.

• Assembly of QC2LP and correctors into one unit:– The assembly is scheduled from 25 March, 2014 at Mitsubishi.
– The mid-planes and magnetic centers of the QC2LP and corrector fields
are measured.
– The cold test of the assembled magnet will be performed in May at KEK.
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SuperKEKB ARC 201419

Production of correctors
Production status of correctors in the left side:
QC1LP correctors : a1, b1, a2, b4

QC2LP correctors : a1, b1, a2, b4

QC1LE correctors : a1, b1, a2, b4

QC1LP leak field cancel coils : b3, b4, b5, b6

The correctors for the QC2LE magnet will be delivered from BNL in March.
The cold test of the correctors is scheduled in March.
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SuperKEKB ARC 201420

Production of correctors
All correctors in KEK were tested in the vertical cryostat.
̶̶The correctors were excited up to 70 A without quench.
The field measurements were performed.
Specification(Required field)

Design field at
70 A

Meas. field at
70 A

a1

0.016 Tm

0.0212 Tm

0.0214 Tm

b1

0.016 Tm

0.0175 Tm

0.0176 Tm

a2

0.64 T

0.9839 T

0.9921 T

b4

60 T/m2

354.6 T/m2

329.6 T/m2

a10.03 Tm

0.02752 Tm

0.02756 Tm

b10.03 Tm

0.03079 Tm

0.03084 Tm

a2

0.31 T

0.5964 T

0.5894 T

b4

60 T/m2

172.3 T/m2

166.8 T/m2

a1

0.027 Tm

0.02707 Tm

0.02702 Tm

b1

0.046 Tm

0.04756 Tm

0.04655 Tm

a2

0.75 T

0.9624 T

0.9504 T

b4

60 T/m2

919.3 T/m2

875.1 T/m2Corrector

QC1LP

QC2LP

QC2LPcorrectors
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QC1LE

SuperKEKB ARC 201421

Production of correctors
Field measurements of the QC1LP leak field cancel coils (b3, b4, b5, b6)
̶The field profiles of the cancel coils need to be measured with the 20 mmlong harmonic coil.

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SuperKEKB ARC 201422

Production of correctors
Field measurements of the QC1LP leak field cancel coils (b3, b4, b5, b6)

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SuperKEKB ARC 201423

Production of correctors•Construction schedule of correctors in the right side̶

The design and the construction of the correctors for the right side already start.
All correctors for the right side are scheduled to be completed in 2014 JFY.
̶•••••••

2014/3/3

QC1RP [a1, b1 and a2]：March 21, 2014QC1RP [b4 and a3]：April 2, 2014
QC2RP：May 21, 2014
QC1RP－QC2RP sextupole：July 30, 2014
QC1RE ＋cancel coils：September 22, 2014
QC2RE：July 14, 2014
QC1RE－QC2RE sextupole：September 4, 2014

SuperKEKB ARC 201424

Construction Schedule
201412345672015
8910111212345672016
8910

11

12

12345

QCSL magnet const.
QCSL cryostat design
QCSL cryostat const.
Assembling magnets into He vessels & cryost.
Installing QCSL in exp. hall
QCSL cold test at exp. hallInstalling QCSL on beam line
QCSL cold test on beam line
QCSR magnet const.
QCSR cryostat design
QCSR cryostat const.
Assembling mag. into He vessels & cryost.
Installing QCSR on beam line
QCSR cold test on beam line
Phase-1 commissioning
Phase-2 commissioning

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SuperKEKB ARC 2014

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Detail schedule for L-side• Magnet construction– QC2LE collaring: March 3 ~ March 7, 2014
– Assembly of QC magnets and correctors: March 17 ~ April•

QC2LE need to be cold tested in March– Yoking of 4 collared magnet: April ~ May•

The permendur yokes and magnetic shields have been completed and transported to Mitsubishi.

– Cold tests of 4 assembled magnets: April ~ June
– Design of solenoid for construction: March ~ April– Construction of solenoid: May ~ July (all magnets for the left side come to be present.)• Cryostat– The detail design of the cryostat is under way.
••

Design of support rods
Thermal shrinkage effect on the components– The design need to be completed in April.
– The radiation shield (Tungsten alloy) have been machined in the final shape.

• Assembled magnet-cryostat– It is scheduled to be completed and transported to KEK in December 2014.
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SuperKEKB ARC 201426

Detail schedule for L-side

Details of the magnets and magnet components in the front helium vessel ofthe left cryostat

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SuperKEKB ARC 201427

Summary• Quadrupole magnet construction– All SC coils for the main quadrupoles were completed.
– The collaring processes of four quadrupoles were completed, and they areaccepted from the field measurement results.
– Collaring all magnets will be completed in March.

• SC corrector construction– The correctors in the left side were completed.
– The transported correctors from BNL to KEK were tested at 4 K in KEK, thecoils showed good performances in excitation and field quality.
– Construction of all coils by BNL will be completed in September 2014.

• Schedule– The magnet-cryostat in the left side will be completed in December 2014.
– The magnet-cryostat in the right side will be completed in July 2015.
– The tests on the beam line are scheduled from September to December
2015.
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SuperKEKB ARC 201428