Abstract

A method for determining the longitudinal electric field from the spectrum of soft X-ray radiation is used to measure the radial distribution of the longitudinal electric field. In the ohmic heating regime, statistically reliable spectra of soft X-ray radiation were measured at the L-2M stellarator. It was obtained that the longitudinal field is distributed approximately uniformly over the radius. Comparison of the measured soft X‑ray radiation (SXR) spectra with the model bremsstrahlung spectrum of magnetized plasma in the longitudinal electric field has shown that at energies W > 3 keV, the measured spectrum deviates markedly not only from the Maxwellian one but also from the model spectrum of magnetized plasma in an electric field. Using SXR spectra that were measured in the regime of electron cyclotron resonance (ECR) plasma heating (without the ohmic-heating current), estimates are made of the longitudinal electric field that may occur in plasma due to drag currents, which are created during ECR heating. The dependence of the electric field on the plasma density was measured and it was shown that it agrees with the dependence of the difference current flowing through the plasma on the density.

中文翻译：

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L-2M恒星发生器在等离子体加热的欧姆回旋和电子回旋共振区中的纵向电场

摘要

根据软X射线辐射的光谱确定纵向电场的方法用于测量纵向电场的径向分布。在欧姆加热条件下，在L-2M恒星仪上测量了软X射线辐射的统计可靠光谱。得到的是，纵向场在半径上大致均匀地分布。在纵向电场中将测量的软X射线辐射（SXR）光谱与磁化等离子体的致辐射模型的光谱进行比较，发现在能量W下> 3 keV，测得的光谱不仅明显偏离麦克斯韦光谱，而且偏离电场中磁化等离子体的模型光谱。使用在电子回旋共振（ECR）等离子体加热状态下测量的SXR光谱（没有欧姆加热电流），估算由于ECR期间产生的拖曳电流而在等离子体中可能产生的纵向电场。加热。测量了电场对等离子体密度的依赖性，并且表明它与流过等离子体的电流差对密度的依赖性一致。