Mezonlin E D, Roberson S, Raynor C, Appartaim R, Johnson J A, Afanasyev V I, Kozlovsky S S, Moller J M, Hill D N, Hooper E B, McLean H S, Wood R D
Florida A&M University, Tallahassee, FL 32310, USA.
Rev Sci Instrum. 2007 May;78(5):053504. doi: 10.1063/1.2737756.
A neutral particle analyzer is used to measure the time-resolved energy spectrum of neutral hydrogen leaving a spheromak plasma. A gas cell filled with 10-50 mTorr of helium is used to strip electrons from incoming neutral hydrogen, lowering the minimum detectable energy well below that obtained with thin foils. Effective neutral particle temperature is calculated by fitting a Maxwellian energy distribution to the measured energy spectrum above and below approximately 300 eV. A computational model with approximated profiles of plasma density and neutral density is used with the measured neutral hydrogen flux to estimate the ion temperature. Measurement of the power flux due to neutral hydrogen emitted at the measurement location is extended to the whole plasma surface to estimate the total charge exchange power loss from the plasma. The initial results indicate that the charge exchange power loss represents only 2% of the total input gun power during the sustainment phase of the discharge.
使用中性粒子分析仪测量离开球形马克等离子体的中性氢的时间分辨能谱。一个充满10 - 50毫托氦气的气室用于从入射的中性氢中剥离电子，将可检测的最低能量降低到远低于使用薄箔所获得的能量。通过将麦克斯韦能量分布拟合到大约300电子伏特以上和以下测量的能谱来计算有效中性粒子温度。使用具有近似等离子体密度和中性密度分布的计算模型以及测量的中性氢通量来估计离子温度。将在测量位置处发射的中性氢引起的功率通量测量扩展到整个等离子体表面，以估计等离子体的总电荷交换功率损失。初步结果表明，在放电维持阶段，电荷交换功率损失仅占总输入枪功率的2%。
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