IR Superconducting Magnets
N. Ohuchi

2015/02/23

SuperKEKB Review 2015

1

Contents
1. Production status of SC magnets and cryostats
2. Tests and measurements of magnet-cryostats
3. Schedule
4. Summary

2015/02/23

SuperKEKB Review 2015

2

Production status of magnets
1. Collaring processes of the 8 SC quadrupole magnets have been
completed in March 2014.
2. The four quadrupole magnets for QCSL were completed, andthey were assembled with the corrector magnets in July 2014.
•

The cold tests of the magnets were performed with the vertical cryostat.
––

The quadrupole magnets and the corrector magnets were successfully excited tothe design currents under the combined excitations without any quenches.
The field measurements were performed with the harmonic coils.

3. Production of all correctors magnets by BNL has been completed
in January 2015.
4. The compensation solenoid, ESL, was constructed in December
2014.
•
•
2015/02/23

ESL was tested at 4K, and it was excited to the design current without quench.
The solenoid field profile was measured with a Hall probe.
SuperKEKB Review 20153

Production status of magnets
QCS-R Cryostat

QCS-L Cryostat

Helium Vessel

Helium Vessel
QC2LP
4 correctors(a1,b1,a2,b4)

ESR1 Solenoid

ESL solenoid
QC1LP
4 correctors(a1,b1,a2,b4)(a1,b1,a2,b4)

QC1LE
4 correctors(a1,b1,a2,b4)

ESR2

QC1RE

4 correctors

Leak field(a1,b1,a2,a3)

b3 corrector

cancel coils(b3,b4,b5,b6)

QC2RE

IP
QC2LE
4 correctors

Helium Vessel

4 correctors(a1,b1,a2,a3)

83 mradLeak fieldcancel coils(b3,b4,b5,b6)

QC1RP
5 correctors

b3 corrector(a1,b1,a2,a3,b4)

QC2RP
4 correctors

HER(a1,b1,a2,a3)

ESR3

Helium Vessel

2015/02/23

SuperKEKB Review 2015

LER

4

Tests during magnet production
QC1, 2 by Mitsubishi：

Field measurements in the factory• Room temperature, Special harmonic coil
• After collaring: Field quality , focused on sextupole error field• After assembling QC with corrector magnets: Field angles

Corrector magnets by BNL：

Field measurements at room temperature in BNL
Excitation and Field measurements at 4K in KEK

Cold tests of assembled magnets [QC1,2 + corrector magnets] in KEK:
• Field measurements and excitation tests at 4K
QC1P, 1E：Harmonic coils [R=12mm, L=595mm n=100 and L=20mm n=120 ]QC2P, 2E：Harmonic coils [R=20mm, L=595 n=150 and L=20mm n=150]

Assembly of QC1,2+corrector magnets into
the support block in Mitsubishi

Now, here for QCSL

Field measurement for alignment of QC magnets in the block in KEK：

• Measurement of magnetic axes and angles of QC magnets at room temperature with the special harmonic coilCold test of combined excitation of QC1P, QC1E, QC2LP, corrector magnets, ESL/ESR in KEK:
• Excitation tests with QC1 and QC2 quadrupole magnets under the solenoid field• Measurement of the cancelled leak field of QC1P magnet with the corrector magnets
2015/02/23

SuperKEKB Review 20155

Error field effect of quadrupoles
Beam lifetime (Touschek lifetime) reduction by error
fields of quadrupole magnets

•
̶
̶
̶

The sextupole field component of 2 ×10-4 with respect toquadrupole field (B3/B2) is induced by the deformation of 8 µm in thecoil shape.
The field component degrades the beam life time from 550 s to 150 s.
The reduced life time is recovered to 500 s with the sextupole
corrector magnets.

From presentation by H. Sugimoto at 18th KEKB Review
2015/02/23

SuperKEKB Review 2015

6

Production of quadrupole magnets
Integral Field measurement results:QC1LP@ R = 10 mm, 1802A

Design @ R= 10 mm

an

bn

an

bn

n=1

0.00

0.00

0.00

0.00

2

0.00

10000

0.00

10000

3

0.45

3.04

0.00

0.00

4

1.49

0.56

0.00

0.24

5

-0.24

-0.39

0.00

0.00

6

-0.39

0.08

0.00

0.54

7

0.11

0.14

0.00

0.00

8

0.03

-0.14

0.00

0.01

9

-0.08

0.04

0.00

0.00

10

0.08

-0.17

0.00

-0.21

2015/02/23

SuperKEKB Review 2015

Design field @1624.9A, r0=10mm
̶ B2Leff/r0 = 22.996 T
Measured field @1624.9A, r0=10mm
̶ B2Leff/r0 = 22.903 T

7

Production of quadrupole magnets
Integral Field measurement results:QC2LP@ R = 30 mm, 1002.3 A

Design @ R = 30 mm

an

bn

an

bn

n=1

0.00

0.00

0.00

0.00

2

0.00

10000

0.00

10000

3

1.79

-0.59

0.00

0.00

4

0.00

0.45

0.00

-0.06

5

-0.39

-0.19

0.00

0.00

6

-0.14

3.40

0.00

0.28

7

0.32

-0.08

0.00

0.00

8

0.13

-0.20

0.00

0.11

9

0.20

0.07

0.00

0.00

10

0.18

-1.50

0.00

-1.43

2015/02/23

SuperKEKB Review 2015

Design field @877.4 A, r0=30 mm
̶ B2Leff/r0 = 11.497 T
Measured field @877.4 A, r0=30 mm
̶ B2Leff/r0 = 11.402 T

8

Production of quadrupole magnets
Integral Field measurement results:QC1LE@ R = 15 mm, 2004.2 A

Design @ R = 15 mm

an

bn

an

bn

n=1

0.00

0.00

0.00

0.00

2

0.00

10000

0.00

10000

3

2.26

-5.41

0.00

0.00

4

-0.85

2.84

0.00

-0.02

5

0.15

0.86

0.00

0.00

6

-0.23

-0.26

0.00

-0.04

7

0.01

0.26

0.00

0.00

8

0.35

0.58

0.00

-0.42

9

-0.11

0.01

0.00

0.00

10

1.25

-0.66

0.00

0.05

2015/02/23

SuperKEKB Review 2015

Design field @1577.1 A, r0=15 mm
̶ B2Leff/r0 = 26.938 T
Measured field @1577.1 A, r0=15 mm
̶ B2Leff/r0 = 26.435 T

9

Production of quadrupole magnets
Integral Field measurement results:QC2LE@ R = 35 mm, 1252.8 A

Design @ R = 35 mm

an

bn

an

bn

n=1

0.00

0.00

0.00

0.00

2

0.00

10000

0.00

10000

3

0.07

-1.04

0.00

0.00

4

1.35

0.32

0.00

-0.02

5

-0.08

0.11

0.00

0.00

6

-0.46

4.41

0.00

-0.04

7

-0.06

-0.13

0.00

0.00

8

0.31

0.11

0.00

-0.42

9

-0.60

1.02

0.00

0.00

10

0.04

2.44

0.00

0.05

2015/02/23

SuperKEKB Review 2015

Design field@976.95 A, r0=35 mm
̶ B2Leff/r0 = 15.272 T
Measured field@ 976.95 A, r0=35 mm
̶ B2Leff/r0 = 14.844 T

10

Production of corrector magnets• Production of 43 corrector magnets were completed.
– The cold tests of the 35 corrector magnets have been performed.
•

The field qualities of the magnets were measured at room temperature in BNL.

•In KEK, the magnets were cooled to 4 K and they were excited to +/－ 60 A.

– The 16 corrector magnets for QCSL were assembled with the QC magnet,
they were tested at 4K under the combined excitations.
– The corrector magnets for QC1RE and the QC1RP leak field cancel magnets
have been constructed by BNL, and they are scheduled to be transported to
KEK in February.

2015/02/23

SuperKEKB Review 201511

Field measurements of correctors•

16 corrector magnets for QCSL

QC1LP

QC2LP

QC1LE

QC2LE

2015/02/23

Corrector

Optics requirement

Design at 60 A
(without Yoke)

After assembled with
QC magnets at 60 A

a1

0.016 Tm

0.0182 Tm

0.0176 Tm (No Yoke)b1

0.016 Tm

0.0150 Tm

0.0145 Tm (No Yoke)a2

0.64 T

0.843 T

0.788 T (No Yoke)b4

60 T/m2

304 T/m2

283 T/m2 (No Yoke)

a1

0.03 Tm

0.0236 Tm

0.0351 Tm

b1

0.03 Tm

0.0264 Tm

0.0406 Tm

a2

0.31 T

0.511 T

0.634 Tb4

60 T/m2

148 T/m2

159.6 T/m2

a1

0.027 Tm

0.0232 Tm

0.0318 Tm

b1

0.046 Tm

0.0408 Tm

0.0544 Tm

a2

0.75 T

0.825 T

0.901 Tb4

60 T/m2

788 T/m2

737 T/m2

a1

0.015 Tm

0.0266 Tm

0.0396 Tm

b1

0.015 Tm

0.0291 Tm

0.0460 Tm

a2

0.37 T

0.580 T

0.732 Tb4

60 T/m2

131 T/m2

142.4 T/m2

SuperKEKB Review 201512

Field measurements of correctors•

19 corrector magnets for QCSR

QC1RP

QC2RP

QC1RE

2015/02/23

Corrector

Optics requirement

Design at 60 A
(without Yoke)

Before assembled with
QC magnets at 60 A

a1

0.016 Tm

0.018 Tm

0.0180 Tm

b1

0.016 Tm

0.0164 Tm

0.0165 Tm

a2

0.64 T

0.814 T

0.788 Ta3

7.6 T/m

9.2 T/m

9.59 T/mb4

60 T/m2

283 T/m2

275 T/m2

a1

0.03 Tm

0.038 Tm

0.0384 Tm

b1

0.03 Tm

0.027 Tm

0.0273 Tm

a2

0.31 T

0.49 T

0.495 Ta3

1.36 T/m

1.39 T/m2

1.430 T/m2

a1

0.027 Tm

0.0226 Tm

Measurement in Marchb1

0.046 Tm

0.040 Tm

Measurement in Marcha20.75 T

0.77 T

Measurement in March

a3

7.0 T/m

21 T/mMeasurement in March

SuperKEKB Review 201513

Field measurements of correctors•

19 corrector magnets for QCSR
Corrector

Optics requirement

Design at 60 A
(without Yoke)

Before assembled with
QC magnets at 60 A

a1

0.015 Tm

0.0224 Tm

0.0231 Tm

b1

0.015 Tm

0.0257 Tm

0.0266 Tm

a2

0.37 T

0.524 T

0.536 Ta3

1.5 T/m

6.2 T/m

6.38 T/m

QC1-2REb3

27 T/m33.4 T/m

33.51 T/m

QC1-2RPb3

17.2 Tm

18.4 T/m

18.87 T/m

QC2RE

The four corrector magnets of QC1RE and the QC1RP leak field cancel magnets will
be measured at 4K in March.

2015/02/23

SuperKEKB Review 201514

QC1LP leak field cancel magnets• LER and HER beam lines have difference of -1.5 mm in height.
– The leak field of QC1LP has the skew field components on the HER beam line.
– The leak field cancel magnets are designed to be rotated to cancel the skew
components as with the normal components.

2015/02/23

SuperKEKB Review 201515

QC1LP leak field cancel magnets• The leak field profile of QC1LP on the HER beam line

2015/02/23

SuperKEKB Review 201516

QC1LP leak field cancel magnets• Magnetic field measurement––

The field measurements were performed with the verticalcryostat.
For measuring the normal and skew components of thecorrector magnets, the phase angle of the measurement wasreferenced to the quadrupole angle of QC1LE.
••

The precise measurements are scheduled with the real cryostats
and the horizontal measurement system.
In the measurement, the phase angle of the magnetic field isdefined with the gravity.

QC1LE
2015/02/23

QC1LP leak field cancel magnet
SuperKEKB Review 201517

QC1LP leak field cancel magnets

The comparison between the calculation and measurement•–

The peak of the normal components are normalized as 10000.

•

b3 corrector magnet : ∫ 𝑏𝑏3−𝑐𝑐𝑐𝑐𝑐𝑐 = 194.4 m, ∫ 𝑏𝑏3−𝑚𝑚𝑚𝑚𝑚𝑚𝑚𝑚 = 197.4 m, ∫𝑎𝑎3−𝑐𝑐𝑐𝑐𝑐𝑐 = −14.8 m, ∫𝑎𝑎3−𝑚𝑚𝑚𝑚𝑚𝑚𝑚𝑚 = −8.28 m

•

̶
•

̶
•

b4 corrector magnet : ∫ 𝑏𝑏4−𝑐𝑐𝑐𝑐𝑐𝑐 = 168.7 m, ∫ 𝑏𝑏4−𝑚𝑚𝑚𝑚𝑚𝑚𝑚𝑚 = 171.5 m, ∫𝑎𝑎4−𝑐𝑐𝑐𝑐𝑐𝑐 = −16.5 m, ∫𝑎𝑎4−𝑚𝑚𝑚𝑚𝑚𝑚𝑚𝑚 = −4.79 m∆= ∫𝑎𝑎3−𝑐𝑐𝑐𝑐𝑐𝑐 − ∫𝑎𝑎3−𝑚𝑚𝑚𝑚𝑚𝑚𝑚𝑚 = −6.52 m corresponds to A3 = 1.16 ×10-4 Tm @ Rref=0.01 m

A3 = 1.16 ×10-4 Tm @ Rref=0.01 m is 5.5 % of the field strength of the A3 corrector magnet in QC1RE at 60 A.

∆= ∫𝑎𝑎4−𝑐𝑐𝑐𝑐𝑐𝑐 − ∫𝑎𝑎4−𝑚𝑚𝑚𝑚𝑚𝑚𝑚𝑚 = −11.71 m corresponds to A4 = 5.48 ×10-5 Tm @ Rref=0.01 m
A4 = 5.48 ×10-5 Tm @ Rref=0.01 m is 2×10-4 of the integral field of QC1LP.

2015/02/23

SuperKEKB Review 201518

QC1LP leak field cancel magnets

The comparison between the calculation and measurement•–

The peak of the normal components are normalized as 10000.

•

b5 corrector magnet : ∫ 𝑏𝑏5−𝑐𝑐𝑐𝑐𝑐𝑐 = 148.5 m, ∫ 𝑏𝑏5−𝑚𝑚𝑚𝑚𝑚𝑚𝑚𝑚 = 150.4 m, ∫𝑎𝑎5−𝑐𝑐𝑐𝑐𝑐𝑐 = −17.8 m, ∫𝑎𝑎5−𝑚𝑚𝑚𝑚𝑚𝑚𝑚𝑚 = −17.9 m•
̶•

b6 corrector magnet : ∫ 𝑏𝑏6−𝑐𝑐𝑐𝑐𝑐𝑐 = 131.5 m, ∫ 𝑏𝑏6−𝑚𝑚𝑚𝑚𝑚𝑚𝑚𝑚 = 133.2 m, ∫𝑎𝑎6−𝑐𝑐𝑐𝑐𝑐𝑐 = −18.7 m, ∫𝑎𝑎6−𝑚𝑚𝑚𝑚𝑚𝑚𝑚𝑚 = −24.6 m∆= ∫𝑎𝑎6−𝑐𝑐𝑐𝑐𝑐𝑐 − ∫𝑎𝑎6−𝑚𝑚𝑚𝑚𝑚𝑚𝑚𝑚 = 5.9 m corresponds to A6 = 1.43 ×10-6 Tm @ Rref=0.01 m
A6 = 1.43 ×10-6 Tm @ Rref=0.01 m is 6.2×10-6 of the integral field of QC1LP

2015/02/23

SuperKEKB Review 201519

Compensation solenoid, ESL• ESL was constructed and delivered to KEK in December 2014.
– The cold tests of ESL was performed in January 2015.
•••

2015/02/23

ESL was excited to the design current of 404 A without quench.
The field measurement by the hall probe was performed.
The field profile on the solenoid axis was measured.

SuperKEKB Review 201520

Compensation solenoid, ESL• Field profile of ESL along the solenoid axis

Measured current =295A

2015/02/23

SuperKEKB Review 201521

Assembly of quadrupoles• Alignment of the magnets and components with the special jig–

The magnets and the pipes are aligned with the special jig.
•••

2015/02/23

The shape of the jig was measured with the FARO 3D surveying instrument.
The magnets were assembled on the jig, and the position of the magnets were measured
before and after welding the support bobbins and pipe.
The alignment errors were within 20 µm.

SuperKEKB Review 201522

Assembly of quadrupoles• Combined QC1LE, QC1LP leak field cancel magnets and magnetic
shieldMagnetic shield
QC1LE +
4 corrector magnets(a1, b1, a2, b4)

2015/02/23

QC1LP leakfield cancel
magnets
SuperKEKB Review(b3, b2015
4, b5, b6)23

Assembly of quadrupoles• Combined QC1LP, magnetic shield and QC2LP

QC2LP +
4 corrector magnets(a1, b1, a2, b4)

Magnetic shield

QC1LP +
4 corrector magnets(a1, b1, a2, b4)

2015/02/23

SuperKEKB Review 201524

Assembly of quadrupoles
ESL

The assembly isscheduled at
March 5th and 6that Mitsubishi.

LER
HER
Tungsten alloy
radiation shield

Iron support block

2015/02/23

Stainless steel support
block
SuperKEKB Review 2015

25

QCSL cryostat• The support rods of the helium vessel are the mostimportant component in the cryostat.
– Mechanical support for the EMF of Belle solenoid field• Nominal operation: EMF of 40 kN to the outside of IP• No operation of ESL (including quench): EMF of 70 kN into IP– Largest heat source to 4K from room temperature• Total heat load of 16 rods = 9.7 W– Positioning mechanism of the helium vessel (magnets)

2015/02/23

SuperKEKB Review 2015

26

QCSL cryostat• Design of the support QCSL rods––

The liquid helium is supported with 8 rods.
The center position between the front and rear rods does not change by cool downfrom room temperature to 4K.
••–

Angles of the front rod= 16.37 degree, the rear rod=15.70 degree
The magnet locations at 300K are designed to be at the specific positions by optics calculation at 4K.

The rod material: Ti-6Al-4V ELI•

Rod cross section= □13.5mm ×13.5mm, Lengths of the front rod=83.5mm, the rear rod=33.5mm

40 kN during operation of ESL
2015/02/23

SuperKEKB Review 2015

70 kN during non-operation of27ESLQCSL cryostat• The tensile and compression tests of the support rod were
performed.
– The applied forces to the sample:••–

Maximum force=64.4 kN (calculated max. load ×1.37)
1.37: safety factor in Mitsubishi

1st test•

Materials of the test sample
–
–
–

•

Mount of the pin : Stainless steel (SUS304)
Pin: Ti alloy
Rod: Ti alloy

Permanent deformation at the hole for the pin in themount– 2nd test•

Improving materials––•

Mount : Stainless steel (YUS170)
Proof strength
SUS304=170 MPa
YUS170=460 MPa

No deformation in the system

2015/02/23

SuperKEKB Review 201528

Cold tests of cryostats• Cold tests of the magnet cryostats are scheduled in theexperimental laboratory before installing them into the IR.
– Tests and measurements in the experimental laboratory• Cooling the magnets down to 4K and exciting the magnets to the design currents• Field quality measurements of the magnets with the rotating harmonic coils• Field axes and angles of the quadrupoles with the single stretched wire (SSW) system– The SSW system is being developed with FNAL under the US-Japan research collaboration
program.

• Vibration measurements of quadrupole fields (in case that the vibration probe is ready)– The pick-up coil type probe is being developed with BNL under the US-Japan researchcollaboration program.

• Cold tests of the magnet cryostats in the IR– Tests and measurements in the IR• Cooling two cryogenic systems (QCSL and QCSR) down to 4K and exciting the magnets tothe design currents under the Belle solenoid field• Measurement of the effect of the EMF by Belle solenoid field on the system• Field quality measurements of the magnets with the rotating harmonic coils• Field axes and angles of the quadrupoles with the single stretched wire (SSW) system• Vibration measurements of quadrupole fields (in case that the vibration probe is ready)
2015/02/23

SuperKEKB Review 201529

Cold tests of cryostats• The QCSL cryostat will be completed in May 2015.
– The cryostat is installed in the experimental laboratory.
– The new cryogenic line for the liquid nitrogen wasconstructed in 2014.
– The cool-down and excitation tests of the magnets arescheduled from July to August 2015.
– The field measurements will start from September 2015.

Gas bag forevaporating He gas

Experimental Lab.

Field measurement
system for alignment

Magnet assembly area
Vertical cryostat
test stands

2015/02/23#3 Building

Harmonic coilcalibration area

SuperKEKB Review 2015

QCS magnet cryostat
test area30

Cold tests of cryostats• Three harmonic coils are being prepared for the measurements of the
field qualities of the magnets.
– Different reference radii of QC1 and QC2 magnets••

QC1P=10 mm, QC1E=15 mm, QC2P=30 mm, QC2E=35 mm
The harmonic coil radius is properly designed for the individual magnet.
For QC1P and QC1E:

Coil radius=12.5 mm, Length=20mm, 600mm

For QC2P:

Coil radius=25 mm, Length=20mm, 700mm

For QC2E:

Coil radius=33 mm, Length=20mm, 800mm

QCSL magnet cryostat
2015/02/23

SuperKEKB Review 201531

Cold tests of cryostats• Measurement of the quadrupole field axis and angle–

Quadrupole axis measurement of KEKB QCS : rotating harmonic coil
•
•
•

–

Simple magnet configuration: one quadrupole magnet at each side
The design quadrupole axes were parallel to the solenoid field axis.
Decentering of the quadrupoles to the beam line was evaluated with the dipole field components of A1
and B1 to the quadrupole field of B2.

Quadrupole axis measurement of SuperKEKB QCS : single stretched wire (SSW)••

Complex magnet configuration: two quadrupole magnets in each side and each beam
The axes of the SuperKEKB quadrupole magnets have the angle of 41.5 mrad to the solenoid field axis.
–

In the QC1P area, the peak skew dipole field by the solenoid field is 0.5T, and it is 60 % of quadrupole fieldstrength on the harmonic coil.

LER

2015/02/23

HER

SuperKEKB Review 201532

Cold tests of cryostats• SSW measurements of the magnet-cryostats in the experimentallaboratory– The stretched wire is aligned with the alignment targets on the cryostat.
– The quadruple magnet is excited individually, and the magnet axis and angle aremeasured to the wire.
– The resolution of the measurement system is about 10 µm, and the precision of themeasurement is about 50 µm.

QCSL magnet-cryostat
QC2LP
QC1LP
QC2LE

QC1LE

Setup of the SSW system and the QCSL magnet-cryostat in the experimental laboratory

2015/02/23

SuperKEKB Review 201533

Cold tests of cryostats• SSW measurements of the magnet-cryostats in the SuperKEKB IR̶̶The stretched wire is aligned to the beam line.
Two magnet-cryostats of QCSL/R are aligned to the beam lines with the targets ofthe cryostats.
•̶During the operation of the SC quadrupole magnets, the electro-magnetic force of 40 kN on two
cryostats by the Belle II solenoid moves the quadrupole magnets.

The SSW system directly measures the field axes and the angles of the quadrupole
magnets with respect to the beam lines with the precision of ±0.1 mm.

QCSL magnetcryostat
QCSR magnetcryostat

2015/02/23

SuperKEKB Review 201534

Cold tests of cryostats• Scheduling of the field measurements in theexperimental laboratory and on the beam lines– The measurement items are programed not to be overlapped in two sites.
•

The field measurements which correlate the measurements between two sites
will be performed.

– The 3D calculation results by OPERA will be used for reducing the total timeof the field measurements.
•

The effect of the Belle end yoke on the magnetic fields of the corrector magnets
are studied with the 3D calculation of OPERA.

•

The full set of the measurements of the corrector magnets in the IR are
downsized.

2015/02/23

SuperKEKB Review 201535

Cold tests of cryostats
IR 3D model : all magnets with the corrector magnets are included.
• The calculation model is now being refined by Y. Arimoto.

By Y. Arimoto
2015/02/23

SuperKEKB Review 201536

Cold tests of cryostats
Experimental Laboratory

Beam Lines

Conditions

Without Belle solenoid field
One set of field measurement system
Independent excitation of magnet

With Belle solenoid field
Two set of field measurement system
Combined excitations of magnets

Integral field measurements by 600-800 mm
long harmonic coils

QC1P, QC2P, QC1E, QC2E: 24 hours
Corrector magnets of 4 QCs: 56 hours
QC1P leak field cancel magnets: 24 hours
Subtotal=104 hours

QC1P, QC2P, QC1E, QC2E: 12 hours
Corrector magnets of 4 QCs: 8 hours
QC1P leak field cancel magnets: 1 hours
Subtotal=21 hours

Field mapping by 20
mm long harmonic
coils

QC1P, QC2P, QC1E, QC2E: 108 hours (4s & 12 GeV)
Corrector magnets of 4 QCs: 64 hours (± 60A)
QC1P leak field cancel magnets: 64 hours (4s & 12 GeV)
Subtotal=236 hours

QC1P, QC2P, QC1E, QC2E: 31 hours (4s & 12 GeV)
Corrector magnets of 4 QCs: 32 hours (+ 60A)
QC1P leak field cancel magnets: 16 hours (4s)
Subtotal=79 hours

Solenoid field mapping
by Hall probe

HER/LER beam lines: 12 hours

Belle field profile of HER/LER beam lines: 12 hours
ES + Belle field profile of HER/LER beam lines: 12 hours

Field axis and angle
measurement by FNAL
SSW

With preparation of the measurement and set-up
40 hours (one week)

With preparation of the measurement and set-up
40 hours (one week)

Vibration measurement
by BNL probe

With preparation of the measurement and set-up
40 hours (one week)

With preparation of the measurement and set-up
40 hours (one week)

Total hours

432 hours (8 hours × 54 days: ~11 weeks: ~3 months)

204 hours (8 hours × 25.5 days: ~6 weeks: ~1.5
month)The measured time is for one magnet-cryostat.
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Construction Schedule
Calendar Year

Calendar Month

2015
1

2

3

4

5

6

2016
7

8

9

1
0

1
1

1
2

1

2

3

4

5

6

2017
7

8

9

1
0

1
1

1
2

1

2

3

Design and Const. of QCSL Magnet-Cryostat
Installing the QCSL Cryostat into the Experimental Lab.
Cooling the QCSL Cryostat to 4K and excitation tests
Magnetic field measurement of QCSL Magnet-Cryostat

BNL Corrector Const. for QCSR
Assemblies of Quadrupoles and Correctors for QCSR
Field meas. of the assembled magnets by vertical cryo.
Design and Const. of QCSR Magnet-Cryostat
Installing the QCSR Cryostat into the Experimental Lab.
Cooling the QCSR cryostat to 4K and excitation tests
Magnetic field measurement of QCSR Magnet-Cryostat

Installing QCSL/R Cryostats on the Beam Lines
Cold tests and Field Meas. of QCSL and QCSR
Re-construction of IR for Beam Operation

Construction of the cryogenic system of QCSR

Phase-1 commissioning
Phase-2 commissioning

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4

5

Construction Schedule
Construction status of cryogenics
He refrigerator
for QCSL

New He compressor building and He tanks for QCSR

He compressor for QCSR

Relocated from Oho exp. hall to the newcomp. building in Tsukuba exp. hall.

Additional He gas tank for QCSLHe refrigerator
for QCSR
2015/02/23

These construction works were performed incollaboration with the Belle cryogenic group.
SuperKEKB Review 201539

Summary• Construction of SC magnets– The SC quadrupole magnets, corrector magnets and the compensation solenoid for QCSL
showed the sufficient performances for the beam operation.
– Assembly of the QC magnets and the correctors for QCSR started in February 2015. This is delayof 6 months in the original construction schedule.

• Magnet-cryostat– The design and tests of the support rods were completed. The degree of completion of the QCSL
cryostat design is 80 %. The service cryostat design is not completed.

• Cold tests of magnet-cryostats– The magnet-cryostats are tested in the experimental laboratory and in the IR.
– Tests• Cool-down and excitation tests, heat load measurements• Field measurements (harmonic coils, Hall probe, FNAL-SSW, BNL-probe)• Schedule– The QCSL magnet-cryostat will be completed in May 2015.
– The QCSR magnet-cryostat is scheduled to be completed in December 2015.
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SuperKEKB Review 201540

Back-up

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Vibration measurement• The measurement system was being developed for ILC IR magnets. The system
consists of a pick-up coil, the support and the vibration isolation table.
• Resolution of a few nm at frequency above a few Hz is achievable.
• The sensor can be inserted at the location of each magnet. The vibration of themagnet is measured, independently.

Carbon Fiber Rod

2500-turn coil

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Vibration measurement• From the beam study, two quadrupole magnets in HER and LER
beam lines need to be measured at the same instant.

QC2LP
QC1LP
QC2LE
QC1LE
Magnet-cryostat in the left side of IP̶Measuring the correlation of vibrations in the two quads to ~ 5nm for f > 5Hz(Vibration resonance of SuperKEKB cryostat = ~ 30 Hz)̶

Two probes need to be installed simultaneously.

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QCSL cryostat

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