Development of high power gyrotrons for advanced fusion devices
Development of high power gyrotrons for advanced fusion devices
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DOI：
10.1088/1741-4326/ab0e2c
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发表时间：
2019-04
期刊：
影响因子：
3.3
通讯作者：
T. Kariya;R. Minami;T. Imai;M. Okada;F. Motoyoshi;T. Numakura;Y. Nakashima;H. Idei;T. Onchi;K. Hanada;T. Shimozuma;Y. Yoshimura;H. Takahashi;S. Kubo;Y. Oda;R. Ikeda;K. Sakamoto;M. Ono;K. Nagasaki;T. Eguchi;Y. Mitsunaka
中科院分区：
文献类型：
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作者：
T. Kariya;R. Minami;T. Imai;M. Okada;F. Motoyoshi;T. Numakura;Y. Nakashima;H. Idei;T. Onchi;K. Hanada;T. Shimozuma;Y. Yoshimura;H. Takahashi;S. Kubo;Y. Oda;R. Ikeda;K. Sakamoto;M. Ono;K. Nagasaki;T. Eguchi;Y. Mitsunaka
兆瓦级回旋管的频率范围从14到300千兆赫，目前正在开发，作为先进聚变装置和示范发电厂电子回旋加热合作研究的一部分。(1)14 GHz 1 MW回旋管的详细设计正在研制中。对于具有高发散度的14 GHz射频（RF）波束，通过引入设计概念，初步计算得到波纹波导耦合处的传输效率为94（通过内置波导直接耦合射频束），以最大限度地减少射频传输路径。安装双盘蓝宝石窗口将使研制一台1兆瓦连续波（CW）回旋管成为可能在14 GHz。(2)在28/35 GHz双频回旋管的实验测试中，对优化结构的双盘蓝宝石窗口的冷却特性进行了评估。我们证实，在28 GHz的CW下以0.4 MW运行是可行的，达到了先前研究中报告的输出功率的两倍。在2 ms短脉冲实验测试中，在28.04 GHz和34.83 GHz的最大功率分别为1.65 MW和1.21 MW。(3)对77/51 GHz双频回旋管进行了设计研究。对于束电压Vk = 80 kV和束电流Ik = 60 A，预期77 GHz的振荡大于1.5 MW，51.88 GHz的振荡大于1.3 MW。(4)在300 GHz回旋管的实验中，通过倾斜输出窗口来减小从窗口反射的波的影响，并且抑制腔中的模式竞争。获得了0.62 MW的输出功率，脉冲宽度为1 ms，这是该频率的新记录。(5)我们还对DEMO的240 GHz回旋管进行了试验设计研究。
Megawatt (MW) gyrotrons, with a wide frequency range from 14 to 300 GHz, are being developed as part of a collaborative electron cyclotron heating (ECH) study for advanced fusion devices and a demonstration power plant (DEMO). (1) Detailed designs for a 14 GHz 1 MW gyrotron are being developed for fabrication. For a 14 GHz radio frequency (RF) beam with high divergence, a calculated transmission efficiency of 94% to the corrugated waveguide coupling position was obtained initially by introducing the design concept (direct RF beam coupling by built-in waveguide) to minimize the RF transmission path. Installing a double-disk sapphire window will make it possible to develop a 1 MW gyrotron with a continuous wave (CW) at 14 GHz. (2) In experimental tests of a new 28/35 GHz dual-frequency gyrotron, the cooling characteristics of an optimal-structure double-disk sapphire window were evaluated. We confirmed that operating at 0.4 MW with a CW at 28 GHz is feasible, reaching twice the output power reported in previous studies. In a 2 ms short-pulse experimental test, maximum powers of 1.65 MW at 28.04 GHz and 1.21 MW at 34.83 GHz were achieved. (3) A design study of a 77/51 GHz dual-frequency gyrotron was performed. Oscillations above 1.5 MW for 77 GHz and 1.3 MW for 51.88 GHz are expected for a beam voltage Vk = 80 kV and beam current Ik = 60 A. (4) In an experiment with a 300 GHz gyrotron, the influence of the wave reflected from the window was reduced by tilting the output window, and mode competition in the cavity was suppressed. An output power of 0.62 MW with a pulse width of 1 ms, which is the new record for this frequency, was obtained. (5) We also performed a trial design study of a 240 GHz gyrotron for DEMO.