Development of 15 T Cryogen-Free Superconducting Magnets

Hirose, R.; Hayashi, Seiji; Fukumizu, S.; Muroo, Y.; Miyata, Hiroyuki; Okui, Y.; Itoki, A.; Kamikado, T.; Ozaki, Osamu; Nunoya, Y.; Okuno, K.

doi:10.1109/tasc.2006.871282

Cited by 20 publications

(8 citation statements)

References 5 publications

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“…The design of the tube is based on a 15 T liquid helium-free superconducting magnet JMTD15T52 produced by JASTEC Ltd. [27,28] and utilizes a high-voltage power supply with a fixed operating voltage of 20 kV and beam current up to 2 A.…”

Section: Selection Of the Operating Modementioning

confidence: 99%

Design of a Second Harmonic Double-Beam Continuous Wave Gyrotron with Operating Frequency of 0.79 THz

Мануилов

Glyavin

Sedov

et al. 2015

J Infrared Milli Terahz Waves

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This paper presents the most essential steps of a design study of a novel second harmonic gyrotron operating in CW (continuous wave) regime at a frequency of 0.79 THz and an output power of 1-100 W. It is based on a novel idea for suppression of the parasitic modes using a double-beam electron-optical system (EOS). It includes a triode magnetron injection gun (MIG), which forms two high-quality helical electron beams (HEB). Different schemes, namely one with two generating beams and another with one generating and one absorbing beam, have been investigated and compared. It has been shown that the scheme with two generating beams is more advantageous since it allows an effective suppression of the parasitic modes and a stable single-mode operation at the second harmonic resonance. A MIG which is appropriate for the realization of the latter scheme has been optimized using numerical codes for computer-aided design (CAD). It forms beams with practically equal pitch factors and moderate velocity spread. The construction of the gun is not sensitive to small misalignments and shifts of the electrodes and the magnetic field. Among the most promising characteristics of the presented design are an improved mode selection and a stable single-mode generation at currents that are two to three times higher than the currents in the single-beam (i.e., conventional) gyrotrons.

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Section: Selection Of the Operating Modementioning

confidence: 99%

Design of a Second Harmonic Double-Beam Continuous Wave Gyrotron with Operating Frequency of 0.79 THz

Мануилов

Glyavin

Sedov

et al. 2015

J Infrared Milli Terahz Waves

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“…We chose ТЕ 10.5.1 as the operating mode at the fundamental cyclotron harmonic. The choice of the mode was based on the dimensions of the hot bore (50 mm in diameter) of the 15 T helium-free cryomagnet [33], which gives a chance to achieve the 394.6 GHz operation at the fundamental harmonic. The fundamental-harmonic operation simplifies the problem of mode competition, which is relevant for the highharmonic operation.…”

Section: Numerical Simulations Of the Smoothly-tunable Gyrotron Outpumentioning

confidence: 99%

The Design of the 394.6 Ghz Continuously Tunable Coaxial Gyrotron for DNP Spectroscopy

Glyavin

Khizhnyak

Лучинин

et al. 2008

Int J Infrared Milli Waves

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Results of the numerical investigations of the coaxial-cavity gyrotron with smooth frequency tuning are presented. The tuning is achieved by moving an internal coneshaped rod along the device axis, which ensures smooth variations in eigenfrequencies of the cavity. The application of an inner conductor with an impedance surface reduces the thermal load on the internal road. The calculation results demonstrate the possibility of tuning the oscillator frequency by 8 GHz for the 394.6 GHz central frequency (within a frequency band of about 2%) with an output power of about several hundreds watts in the CW regime.

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“…The types of experiments include: nd Sumitomo RDK408 cryocooler. Magnetic fields of 13 to 15T [21][22][23][24] for cryogen-free LTS magnets have been reported. The cost trade off between cryogen and cryogen free designs depends on initial costs, usage and local liquid helium costs.…”

Section: Properties Of the Magnetmentioning

confidence: 99%

Novel Cryogenic Engineering Solutions for the New Australian Research Reactor Opal

Olsen¹,

Kennedy²,

Kim³

et al. 2008

AIP Conference Proceedings

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In August 2006 the new 20MW low enriched uranium research reactor OPAL went critical. The reactor has 3 main functions, radio pharmaceutical production, silicon irradiation and as a neutron source. Commissioning on 7 neutron scattering instruments began in December 2006. Three of these instruments (Small Angle Neutron Scattering, Reflectometer and Time-of-flight Spectrometer) utilize cold neutrons.The OPAL Cold Neutron Source, located inside the reactor, is a 20L liquid deuterium moderated source operating at 20K, 330kPa with a nominal refrigeration capacity of 5 kW and a peak flux at 4.2meV (equivalent to a wavelength of 0.4nm). The Thermosiphon and Moderator Chamber are cooled by helium gas delivered at 19.8K using the Brayton cycle. The helium is compressed by two 250kW compressors (one with a variable frequency drive to lower power consumption).A 5 Tesla BSCCO (2223) horizontal field HTS magnet will be delivered in the 2 nd half of 2007 for use on all the cold neutron instruments. The magnet is cooled by a pulse tube cryocooler operating at 20K. The magnet design allows for the neutron beam to pass both axially and transverse to the field. Samples will be mounted in a 4K to 800K GiffordMcMahon (GM) cryofurnace, with the ability to apply a variable electric field in-situ. The magnet is mounted onto a tilt stage. The sample can thus be studied under a wide variety of conditions. A cryogen free 7.4 Tesla Nb-Ti vertical field LTS magnet, commissioned in 2005 will be used on neutron diffraction experiments. It is cooled by a standard GM cryocooler operating at 4.2K. The sample is mounted in a 2 nd GM cryocooler (4K-300K) and a variable electric field can be applied. KEYWORDS:Cold neutron source, BSSCO (2223), Bi-2223, cryogen-free, neutron science, HTS magnet, LTS magnet, OPAL. 299ATTACHMENT I CREDIT LINE (BELOW) TO BE INSERTED ON THE FIRST PAGE OF EACH PAPER EXCEPT FOR ARTICLES ON pp. 152 -159, 225 -234, 277 -283, 284 -290, 685 -692, 1083ON pp. 152 -159, 225 -234, 277 -283, 284 -290, 685 -692, -1090ON pp. 152 -159, 225 -234, 277 -283, 284 -290, 685 -692, , 1359ON pp. 152 -159, 225 -234, 277 -283, 284 -290, 685 -692, -1366ON pp. 152 -159, 225 -234, 277 -283, 284 -290, 685 -692, , 1375ON pp. 152 -159, 225 -234, 277 -283, 284 -290, 685 -692, -1382ON pp. 152 -159, 225 -234, 277 -283, 284 -290, 685 -692, , 1383ON pp. 152 -159, 225 -234, 277 -283, 284 -290, 685 -692, -1391ON pp. 152 -159, 225 -234, 277 -283, 284 -290, 685 -692, , 1467ON pp. 152 -159, 225 -234, 277 -283, 284 -290, 685 -692, -1474ON pp. 152 -159, 225 -234, 277 -283, 284 -290, 685 -692, , 1491ON pp. 152 -159, 225 -234, 277 -283, 284 -290, 685 -692, -1498ON pp. 152 -159, 225 -234, 277 -283, 284 -290, 685 -692, , 1499ON pp. 152 -159, 225 -234, 277 -283, 284 -290, 685 -692, -1506ON pp. 152 -159, 225 -234, 277 -283, 284 -290, 685 -692, , 1507ON pp. 152 -159, 225 -234, 277 -283, 284 -290, 685 -692, -1514ON pp. 152 -159, 225 -234, 277 -283, 284 -290, 685 -692, , and 1629ON pp. 152 -159, 225 -234, 277 -283, 284 -290, 685 -692, ...

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Development of 15 T Cryogen-Free Superconducting Magnets

Cited by 20 publications

References 5 publications

Design of a Second Harmonic Double-Beam Continuous Wave Gyrotron with Operating Frequency of 0.79 THz

Design of a Second Harmonic Double-Beam Continuous Wave Gyrotron with Operating Frequency of 0.79 THz

The Design of the 394.6 Ghz Continuously Tunable Coaxial Gyrotron for DNP Spectroscopy

Novel Cryogenic Engineering Solutions for the New Australian Research Reactor Opal

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