Development of over-MW gyrotrons for fusion at 14 GHz to sub-THz frequencies
Development of over-MW gyrotrons for fusion at 14 GHz to sub-THz frequencies
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DOI：
10.1088/1741-4326/aa6875
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发表时间：
2017-04
期刊：
影响因子：
3.3
通讯作者：
T. Kariya;T. Imai;R. Minami;K. Sakamoto;Y. Oda;R. Ikeda;T. Shimozuma;S. Kubo;H. Idei;T. Numakura;K. Tsumura;Y. Ebashi;M. Okada;Y. Nakashima;Y. Yoshimura;H. Takahashi;S. Ito;K. Hanada;K. Nagasaki;M. Ono;T. Eguchi;Y. Mitsunaka
中科院分区：
文献类型：
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作者：
T. Kariya;T. Imai;R. Minami;K. Sakamoto;Y. Oda;R. Ikeda;T. Shimozuma;S. Kubo;H. Idei;T. Numakura;K. Tsumura;Y. Ebashi;M. Okada;Y. Nakashima;Y. Yoshimura;H. Takahashi;S. Ito;K. Hanada;K. Nagasaki;M. Ono;T. Eguchi;Y. Mitsunaka
目前正在开发兆瓦级功率回旋管，用于先进聚变装置和示范发电厂的电子回旋加热合作研究。(1)在300 GHz的回旋管的第一个实验中，在TE 32，18单模输出功率超过0.5兆瓦，实现了2毫秒的脉冲宽度。这是第一次观察到兆瓦级振荡的DEMO相关的回旋管模式。还发现输出窗口处的反射影响振荡模式的确定。此外，在226-254 GHz范围内的几个单模振荡被证实，这是重要的步进频率可调谐回旋管在亚太赫兹频率范围内。(2)基于77和154 GHz大螺旋管的成功结果，正在设计一种输出功率超过1.5 MW的154/116 GHz双频回旋管。(3)使用现有的28 GHz回旋管获得了1.38 MW的新记录输出。一个新设计的管，旨在实现双频输出功率为2兆瓦在28 GHz（0.4兆瓦连续波）和1兆瓦在35 GHz的建成。在第一次实验测试中，观察到主模式振荡的频率为28.036和34.831 GHz的高斯型输出光束和输出功率分别为1.27和0.48 MW。在28 GHz工作时，总效率达到50%。
Megawatt power gyrotrons are being developed for collaborative electron cyclotron heating (ECH) studies of advanced fusion devices and demonstration power plant (DEMO). (1) In the first experiment of a 300 GHz gyrotron, an output power above 0.5 MW in the TE32,18 single mode was achieved with a pulse width of 2 ms. This was the first observation of MW-scale oscillations in a DEMO-relevant gyrotron mode. It was also found that the reflection at the output window affected the determination of the oscillation mode. Furthermore, several single mode oscillations in the 226–254 GHz range were confirmed, which is important for the step-frequency tunable gyrotron in the sub-THz frequency range. (2) Based on the successful results of the 77 and 154 GHz large helical device (LHD) tubes, a new 154/116 GHz dual-frequency gyrotron with an output of over 1.5 MW is being designed. (3) A new record output of 1.38 MW was obtained using an existing 28 GHz gyrotron. A newly designed tube aimed at achieving a dual-frequency output power of 2 MW at 28 GHz (0.4 MW continuous wave) and 1 MW at 35 GHz was built. In the first experimental test, main mode oscillations were observed at the frequencies of 28.036 and 34.831 GHz with Gaussian-like output beams and output power of 1.27 and 0.48 MW, respectively. A total efficiency of 50% was achieved at 28 GHz operation.