Development of 28 GHz and 77 GHz, Mega-Watt Gyrotrons for Fusion Devices

Kariya, T.; Minami, R.; Imai, T.; Ota, M.; Endo, Yukari; Kubo, S.; Shimozuma, T.; Takahashi, H.; Yoshimura, Y.; Ito, Satoshi; Mutoh, T.; Sakamoto, K.; Mitsunaka, Y.

doi:10.1007/s10762-010-9727-8

Cited by 30 publications

(15 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The 28 GHz gyrotron being considered for the NSTX-U ECRH/EBWH system was developed for for ECRH on the GAMMA10 tandem mirror [8]. The gyrotron has an output power of 1 MW, a pulse length of 1-5 s and uses a TE 8,3 cavity mode.…”

Section: Design Of the Nstx-u 28 Ghz Heating Systemmentioning

confidence: 99%

ECRH/EBWH system for NSTX-U

Taylor

Ellis

Harvey

et al. 2012

EPJ Web of Conferences

View full text Add to dashboard Cite

Abstract. The National Spherical Torus Experiment Upgrade (NSTX-U) will operate at an axial toroidal field of up to 1 T, about twice the field available on NSTX. A 28 GHz electron cylotron resonance heating (ECRH) system is currently being planned for NSTX-U. A 1 MW 28 GHz gyrotron will be employed. Intially the system will use short, 10-50 ms, 1 MW pulses for ECRH-assisted discharge start-up. Later the pulse length will be extended to 1-5 s to study electron Bernstein wave heating (EBWH) during the plasma current flat top. A mirror launcher will be used to couple microwave power to the plasma via O-mode to the slow X-mode to EBW (O-X-B) double mode conversion. This paper presents a pre-conceptual design for the ECRH/EBWH system proposed for NSTX-U and includes ray tracing and Fokker-Planck modeling results for 28 GHz ECRH during plasma start-up and EBW heating and current drive during the plasma current flattop of a NSTX-U advanced H-mode plasma scenario.

show abstract

Section: Design Of the Nstx-u 28 Ghz Heating Systemmentioning

confidence: 99%

ECRH/EBWH system for NSTX-U

Taylor

Ellis

Harvey

et al. 2012

EPJ Web of Conferences

View full text Add to dashboard Cite

show abstract

“…Numerical investigation of the set of self-consistent equations was carried out for the 1-MW gyrotron developed for the GAMMA10/PDX tandem mirror [13,14]. The operation mode is the TE94 mode at 35.45 GHz at the cavity, and the device operates at the fundamental cyclotron resonance.…”

Section: Resultsmentioning

confidence: 99%

Code development for the calculations of time-dependent multimode oscillations in the cavity of the future high-power gyrotrons

Numakura¹,

Imai²,

Kariya³

et al. 2016

AIP Conference Proceedings

View full text Add to dashboard Cite

Investigations and advanced concepts on gyrotron interaction modeling and simulations Physics of Plasmas 22, 123114 (2015) Abstract. A computational code for the electromagnetic field in the cavity of high-power gyrotrons is developed. The gyrotron mechanism is described by a self-consistent set of equations taking into account the dependence of the axial structure of microwave oscillations on the relativistic electron beam in the cavity. The parameters of the electron beam are calculated using the EGUN electron trajectory code, and the effects of the space charge and the velocity spread of the electron beams are considered. The computational code includes a time-dependent description of the electromagnetic field and a self-consistent analysis of the electron beams. The equations are solved using a second-order predictor-corrector scheme. The calculations of the present study are carried out for a 1-MW gyrotron developed for the GAMMA10/PDX tandem mirror (80 kV, operating mode: TE94 mode, 35.45 GHz). The calculations reveal that, using a triode-type electron gun, stable excitation of the desired mode can be realized in standard startup scenarios.

show abstract

“…Therefore, we have started development of over-1.5 MW gyrotron at 28 GHz. The first tube of 1 MW, a few seconds, 28 GHz gyrotron for GAMMA 10 and other low B field device ECH source has been already fabricated and tested [5]. The obtained maximum output is 1.0 MW at 40 A.…”

Section: Design Study Of Mw Gyrotron and Ech Antenna For High Energy mentioning

confidence: 99%

Development of High Power ECH Systems for High and ELM-like Heat Flux in GAMMA 10 Tandem Mirror

Minami

Imai

Kariya

et al. 2013

Plasma and Fusion Research

Self Cite

View full text Add to dashboard Cite

Development of high power gyrotrons and electron cyclotron heating (ECH) systems for the power modulation experiments in GAMMA 10 have been started in order to generate and control the high heat flux and to make the ELM (edge localized mode) like intermittent heat load pattern for divertor simulation studies. ECH for potential formation at the plug region (P-ECH) produces the electron flow with high energy along the magnetic filed line. From the power scaling of confining potential and electron flux in GAMMA 10, the higher ECH power generates the higher confinement potential and the higher electron flux. The peak heat-flux of more than 10 MW/m 2 has been obtained during the ECH injection within the available power of ECH. This value almost corresponds to the steady-state heat load of the divertor plate of ITER. However, we need substantial upgrade of the heating power to approach the ITER level ELM energy density. For this purpose, MW power gyrotrons at 28 GHz have been started and the development is undergoing efficiently in the ECH system upgrade program with the collaboration of Japan Atomic Energy Agency (JAEA).

show abstract

Development of 28 GHz and 77 GHz, Mega-Watt Gyrotrons for Fusion Devices

Cited by 30 publications

References 10 publications

ECRH/EBWH system for NSTX-U

ECRH/EBWH system for NSTX-U

Code development for the calculations of time-dependent multimode oscillations in the cavity of the future high-power gyrotrons

Development of High Power ECH Systems for High and ELM-like Heat Flux in GAMMA 10 Tandem Mirror

Contact Info

Product

Resources

About