Investigation on Direct Energy Conversion for Helium-3 Fuelled Nuclear Fusion

氦3燃料核聚变直接能量转换研究

基本信息

批准号：
08558052
负责人：
YASAKA Yasuyoshi
金额：
$ 6.46万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08558052/
关键词：
nuclear fusion helium 3 direct energy conversion proton beam RF traveling wave カスプ石並場カスプ磁場

项目摘要

We perform a proof-of-principle experiment of a traveling wave direct energy converter (TWDEC), which was proposed as an efficient energy converter from high-energy protons produced by D-^3-He fueled fusion reactor directly into electricity. In TWDEC,the incident proton beam is velocity-modulated so as to form a bunched beam, which is to be decelerated by a traveling RF wave. The induced current in the traveling wave circuit provides RF power to the load.We use low-energy He-ion beam of a few keV and investigate the interaction of the beam with RF for modulation and deceleration. The experimental apparatus consists of a helicon-wave ion source, a modulator and a decelerator. The He-ion beam is velocity-modulated with RF electric fields at 7MHz applied to the two modulator grids. The decelerator grids (4 to 8) are aligned along the beam path with each separation of a few cm. They are connected to a transmission line terminated with a matched load resistor. We drive the transmission line by the same RF source for the modulator with a variable phase difference. We confirm that the beam is first velocity modulated at the modulator and then, density-modulated as a result of bunching. We compare the energy distribution functions of the beam with and without the driving voltage on the transmission line to find that the distribution function shifts toward lower energy side upon application of the modulator and decelerator RF.When the phase of the decelerator RF with respect to the modulator RF is changed by pi, the high energy component is increased. These results indicate that the ion beam can be decelerated by the traveling wave as planned in TWDEC concept. The efficiency of deceleration of the beam is measured to be 14%, which is consistent with simulation results.

我们进行了流动波直接转换器（TWDEC）的原理证明实验，该实验是从D-^3-^3-He燃料融合反应器直接进入电力的高能质子中的有效能量转换器。在TWDEC中，入射质子束进行了速度调节，以形成束束，该光束将通过行进的RF波减速。波动波电路中的诱导电流为负载提供了RF功率。我们使用几个keV的低能He-ion束，并研究了光束与RF的相互作用，以进行调制和减速。实验设备由Helicon-Wave离子源，调制器和减速器组成。 He-Ion束在7MHz的RF电场上进行速度调节，该电场应用于两个调节器网格。减速器网格（4至8）沿着梁路径对齐，每次分离几cm。它们连接到用匹配的负载电阻终止的传输线。我们以相同的相位差的调制器来驱动传输线。我们确认梁是首先在调制器处调制的速度，然后由于束束而进行密度调节。我们比较带有和没有传输线上驱动电压的梁的能量分布函数，以发现应用调制器和减速器RF时，分布函数向较低的能量侧移动。当减速器RF相对于调制器RF的相位相对于PI改变了调制器RF时，高能组件就会增加。这些结果表明，根据TWDEC概念计划的行动波可以减速离子光束。梁减速的效率为14％，这与模拟结果一致。