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Density Profiles in the Levitated Dipole Experiment

机译:悬浮偶极子实验中的密度分布

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A multi-chord interferometer (center frequency 60 GHz) has been constructed to measure the electron density profiles of plasmas in the Levitated Dipole Experiment (LDX). Theoretical considerations suggest that the density of a dipole-confined plasma will vary with radius as 1/r~4. Measurements have been made for LDX plasmas, where the dipole-field was produced by a coil that was not levitating but rather suspended from a central column by thin supports. A ray-tracing code has been written to fit the chord data, which are line-integrated densities, to azimuthally-symmetric electron density profiles n_e(r, t). Initial analysis has focused on the model n_e(r, t) =A(t)(r- r_0)~(α(t)), where A(t) and α(t) are free parameters; α(t) is referred to as the "steepness exponent." The density profiles are observed to exhibit dynamics due to ECR heating and neutral-gas fueling. The model-fit, meant only to serve as a rough approximation, suggests that LDX plasmas have steepness exponents in the range of 1.5-4. The density at the location of the 2.45 GHz ECRH resonance is reconstructed and found to be of the same order of magnitude as the heating cut-off n_e ~ n_c = 7.4 × 10~(10)cm~(-3).
机译:已经构造了多弦干涉仪(中心频率60 GHz),以在悬浮偶极实验(LDX)中测量等离子体的电子密度分布。从理论上讲,偶极子约束等离子体的密度将随着半径的变化而变化,为1 / r〜4。已经对LDX等离子体进行了测量,其中偶极场是由一个线圈产生的,该线圈不是悬浮的而是由薄支撑物从中心柱上悬挂下来的。已经编写了光线跟踪代码,以将弦积分线的弦数据与方位角对称的电子密度曲线n_e(r,t)拟合。初始分析集中在模型n_e(r,t)= A(t)(r- r_0)〜(α(t))上,其中A(t)和α(t)是自由参数。 α(t)被称为“硬度指数”。观察到由于ECR加热和中性气体加油,密度分布显示出动态。模型拟合仅用作粗略近似,表明LDX等离子体的陡度指数在1.5-4范围内。重建了2.45 GHz ECRH共振处的密度,发现其密度与加热截止n_e〜n_c = 7.4×10〜(10)cm〜(-3)相同。

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