Development of Radiation-Resistant Magnets for JHF/J-PARC K.H. - - PowerPoint PPT Presentation

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Development of Radiation-Resistant Magnets for JHF/J-PARC K.H. - - PowerPoint PPT Presentation

May 29, 2023 400 likes •670 views

Development of Radiation-Resistant Magnets for JHF/J-PARC K.H. Tanaka for the Hadron Beam Subgroup of the JHF Construction Team KEK - TOKIN Corp. - Hitach Cable Ltd. Collaboration Collaboration KEK K. H. Tanaka, E. Hirose, H.

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SLIDE 1

Development of Radiation-Resistant Magnets for JHF/J-PARC

  • K.H. Tanaka for

the Hadron Beam Subgroup

  • f the JHF Construction Team
  • KEK - TOKIN Corp. - Hitach Cable Ltd.

Collaboration

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SLIDE 2
  • KEK
  • K. H. Tanaka, E. Hirose, H. Takahashi, K. Agari,
  • A. Toyoda, Y. Sato, M. Minakawa, H. Noumi,
  • Y. Yamanoi , M. Ieiri, Y. Katoh, Y. Yamada,
  • Y. Suzuki, and M. Takasaki
  • TOKIN
  • Y. Saitoh, N. Saitoh, K. Yahata, K. Kato,

and H. Tanaka

  • Hitachi Cable
  • T. Birumachi, and S. Tsukada

Collaboration

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SLIDE 3

Menu on Oct. 21st, 2003

  • JHF/J-PARC
  • RR-Magnets…My History in Japan
  • Mineral Insulation Cable (MIC)
  • Q440MIC Fabrication
  • Summary
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SLIDE 4

NP-HALL

J-PARC: The Accelerator Complex

  • NP-Hall & Neutrino Facility for Experiments with

50GeV-15μA Beam

– The First (Only One?) KAON FACTORY in the World

  • Handling of 1MW Beam (4MW in future!)
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SLIDE 5

Artist’s Impression of the J-PARC

Nuclear and Particle Experimental Facility Materials and Life Science Experimental Facility Neutrino to Kamiokande Linac (350m) 3 GeV Synchrotron (25 Hz, 1MW) Nuclear Transmutation 50 GeV Synchrotron (0.75 MW)

J-PARC = Japan Proton Accelerator Research Complex

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SLIDE 6

World’s Proton Accelerators

Under construction Proposed Existing IPNS

1000 10000 100 10 1 0.01 0.1 0.1 1 10 100 1000 10000 Energy (GeV)

AGS CERN-PS FNAL-MI U70 SPS ISIS TRIUMF PSI

(CW)

KEK- 12GeV PS Tevatron This Project 3 GeV

Power

KEK-500MeV Booster

Current (µA)

SNS

Materials-Life Sciences 1 MW 0.1 MW

ESS

Nuclear-Particle Physics

This Project 50 GeV

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SLIDE 7

Schedule

  • 2001: Approval by Japanese Government
  • 2002: Digging Started
  • Now

Accelerators are under Construction

– Experimental Facilities are Final Stage of their Design Work

  • 2004: Start of NP-Hall Construction
  • 2007: Completion of NP-Hall
  • 2008: The First Beam
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SLIDE 8

High Intensity Beam handling

  • Radiation Resistant Magnet is the key

technology

  • Radiation Resistant Magnets

→Radiation Resistant Coil Insulation

  • We continued ~20 years R/D of

Radiation Resistant Magnet.

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SLIDE 9

History of Radiation Resistant Magnets R&D in Japan

Polyimide resin + Boron free Glass tape (MT11)

– Great Success, up to 109Gy – All the JHF Accelerator Magnets Employed Polyimide Insulation.

  • High Alumina Cement + Asbestos Tape(MT11)
  • Ceramic Binder + Ceramic Fiber Tape(MT13)

– Success, up to 1011Gy – Technology was Established.

  • MIC(MT14 →)

– Great Success, up to 1011Gy

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SLIDE 10

Status of Mineral Insulation Cable

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SLIDE 11

Construction of actual magnet

Q440MIC

  • 20cm bore diam., 200cm pole length
  • 43T/pole, 1.3T@pole
  • Nominal current/voltage=2200 A/200V
  • Cooling water=290 L/min.@1MPa
  • Cooling water Temp. rise=30 ℃
  • Approximate Weight=33ton
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SLIDE 12

Q440MIC Coil Design

  • 4+14+25 turns
  • Total 43 turns
  • 6 Conductors
  • 4 water path/coil
  • Limited area at

both magnet ends

  • Small bending

radius

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SLIDE 13

wrinkles Unwanted inward width expamsion

Bending Tests at small radius

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SLIDE 14

R/T=1.5↑,2.0↓ R/T=2.5↑,3.0 ↓

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SLIDE 15

How much did MIC become thicker?

R/T Increase width/Original width

Bender Bending Handle Bending

  • 8-13% for R/T=1.5
  • Employ “Bending Tool” and R/T~2
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SLIDE 16
  • No difference

from Straight Samples

  • Proportional to

Long MIC

  • Electrically NO

PROBLEM even for R/T=1.

Leak Current (mA) for AC1kV

Leakage Current Check for 2500A-Class MIC Bent Samples

MIC Length (m)

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SLIDE 17

Tools for fat-free bending.

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SLIDE 18

Coil Winding

4turn coils↑, 14turn coil↓, 25 turn coil↑, Final assembly↓

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SLIDE 19

Terminal Treatments

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SLIDE 20

Q440MIC Magnet Assembly

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SLIDE 21

Q440MIC Completed!

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SLIDE 22

Shield & Service Space

Concrete Block Service Space: QD for Water, Power, Vacuum and Signal Concrete Block Iron Shield Magnet Trench Water Cooled Bus Duct: Electricity & Interlock Signals Cooling Water Supply Permanent Concrete Shield Ceiling Shield Blocks are removed at the maintenance

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SLIDE 23

Summary

  • The actual Q magnet for 50 GeV proton beam

transport has been fabricated successfully with 2500 A class MIC (24x24mm2).

  • Some unwanted deformation problems were

happened at small bending radius of the MIC. However electrically NO problem.

  • The fabrication technology for large scale window

frame winding coils of MIC has been established.

  • Next step is the mass-production! For JHF/J-PARC
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SLIDE 24

JAERI Tokai Campus, Early May 2003, II.

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SLIDE 25

50GeV-PS Construction Status (August 2003)

3GeV Beam