Development of Indirect-Cooling Radiation-Resistant Magnets

Takahashi, Hajime; Agari, K.; Hirose, E.; Ieiri, M.; Iio, M.; Katoh, Y.; Minakawa, M.; Muto, R.; Naruki, M.; Noumi, H.; Sato, Y.; Sawada, S.; Suzuki, Yoshihiro; Takasaki, M.; Tanaka, Kazuhiro; Toyoda, A.; Watanabe, H.; Yamanoi, Y.; Saijo, Masaru; Saitoh, Y.; Katoh, Kanoko; Yahata, K.

doi:10.1109/tasc.2008.921261

Cited by 7 publications

(7 citation statements)

References 3 publications

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“…The heat problem at the end parts of MICs, which is outside of the casing filled with solder, is critical, especially when operated in vacuum. By improving the structure of end parts of MICs and increasing their emissivity, we have succeeded to operate SC-MIC coils with the current of DC 1000 A in vacuum without additional cooling channels for the end parts [4], [5].…”

Section: B Indirectly Cooled Mineral-insulation Coilsmentioning

confidence: 99%

“…Current leads were also wired through the iron blocks from the coils to feedthroughs in the vacuum flange. The current leads were made of SC-MICs and stainless-steel pipes and are cooled by water indirectly [4], [5]. All bus bars copper-brazed with the MIC ends were black painted with colloidal graphite in order to improve the emissivity for radiation cooling [4], [5].…”

Section: Fabrication and Operation Of K11d1 Magnetmentioning

confidence: 99%

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Indirectly Cooled Radiation-Resistant Magnet With Slanting Saddle Shape Coils for New Secondary Beam Extraction at J-PARC Hadron Facility

Takahashi

Agari

Hirose

et al. 2012

IEEE Trans. Appl. Supercond.

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We have developed the most upstream dipole magnet K1.1D1 for a new secondary beam line at the hadron experimental hall in J-PARC. It is placed downstream of a production target and is close to the K1.8D1 magnet. Indirectly cooled coils using mineral insulation cables have been adopted for high radiation resistance. The coils have a slanting saddle shape in order to minimize the interference of the magnetic field between the two magnets. It has been operated during the beam time in the autumn of 2010 without any problems.Index Terms-High intensity accelerator, high intensity beam lines, radiation resistant magnet.

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Section: B Indirectly Cooled Mineral-insulation Coilsmentioning

confidence: 99%

Section: Fabrication and Operation Of K11d1 Magnetmentioning

confidence: 99%

Indirectly Cooled Radiation-Resistant Magnet With Slanting Saddle Shape Coils for New Secondary Beam Extraction at J-PARC Hadron Facility

Takahashi

Agari

Hirose

et al. 2012

IEEE Trans. Appl. Supercond.

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View full text Add to dashboard Cite

show abstract

“…The heat problem at the end parts of MICs, which is outside of the casing filled with solder, is critical, especially when operated in vacuum. By improving the structure of end parts of MICs and increasing their emissivity, we have succeeded to operate a SC-MIC coil with the current of DC 1000 A in vacuum without additional cooling channels for the end parts [8].…”

Section: Structure Of Plug-in Magnetsmentioning

confidence: 99%

“…The pipes and the leads are wound twice in the iron block to make a labyrinth for shielding radiation efficiently. The current leads are also made of SC-MICs and stainless-steel pipes and are cooled by water indirectly [8]. All of iron components including magnet poles and yoke were plated with nickel for the rust prevention, because organic rust-preventive paints cannot resist high radiation environment.…”

Section: Structure Of Plug-in Magnetsmentioning

confidence: 99%

Indirectly Cooled Radiation-Resistant Magnets for Hadron Target Station at J-PARC

Takahashi

Agari

Hirose

et al. 2010

IEEE Trans. Appl. Supercond.

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The target station in the hadron experimental facility at J-PARC consists of a production target and a huge vacuum chamber in which several secondary-beam-line magnets can work. This vacuum chamber system aims to remove the vacuum beam pipe from the magnet gap, because the cooling of the beam pipe is the most serious problem in the high intensity beam facility. We have developed indirectly cooled radiation-resistant magnets for the hadron target station. Their coils are made of solid-conductor type mineral-insulation cables and stainless-steel water pipes. They have the great advantages that electric circuits can be completely independent of water pass. The mechanical strength and the insulation performance of the coil are significantly improved also because the insulation water pipes can be avoided from the water pass. A C-type sector dipole and a figure-8-type quadrupole magnet have been fabricated by using indirectly cooled radiation-resistant magnet technology, and installed in the vacuum chamber. We have succeeded to operate them in vacuum stably with the current of DC 1000 A by improving the end structure of the MIC coils and increasing their emissivity. These magnets have been used for the real beam operation without any serious problems.Index Terms-High intensity accelerator, high intensity beam lines, radiation resistant magnet.

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“…We have solved the problem by preparing a pentagon-shape vacuum chamber (5m in height, 3m in length, 3m in width) downstream the target, and operating magnets in vacuum. As a result, vacuum pipes are omitted from the upstream part of the secondary beam lines [4]. …”

Section: The Primary and Secondary Beam Lines In Hadron Experimental mentioning

confidence: 99%

Construction and Beam Commissioning of J-PARC Hadron Experimental Facility

Sato¹,

Agari²,

Hirose³

et al. 2010

AIP Conference Proceedings

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J-PARC Hadron Experimental Facility is designed as a multi-purpose experimental facility for particle and nuclear physics experiments using high-intensity secondary particles (Kaons, pions, and so on) produced by 50GeV-15μA (750kW) primary proton beams. Currently, three secondary beam lines (K1.8BR, K1.8, and KL) have been constructed. The first beam extraction from 50GeV proton synchrotron was on January 27 th , 2009, and the beam commissioning of the primary and secondary beam lines are on going. The present article reports construction status and beam commissioning of Hadron Experimental Facility in detail.

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Development of Indirect-Cooling Radiation-Resistant Magnets

Cited by 7 publications

References 3 publications

Indirectly Cooled Radiation-Resistant Magnet With Slanting Saddle Shape Coils for New Secondary Beam Extraction at J-PARC Hadron Facility

Indirectly Cooled Radiation-Resistant Magnet With Slanting Saddle Shape Coils for New Secondary Beam Extraction at J-PARC Hadron Facility

Indirectly Cooled Radiation-Resistant Magnets for Hadron Target Station at J-PARC

Construction and Beam Commissioning of J-PARC Hadron Experimental Facility

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