The Optical Penning (or Species-Selective Penning) Gauge technique is used for the measurement of the H₂/D₂/T₂ fuel isotopic composition and He/D₂ concentration in the neutralized particle exhaust of fusion devices. An Optical Penning detection system has already been used in JET during its first deuterium-tritium campaigns (DTE1) and has been chosen by ITER. Recent improvements to the sub-divertor diagnostic suite as well as the optical instrumentation, in preparation for the next DT campaign, have improved the optical throughput of the measurement and enabled ³He/D₂ detection down to 0.1 %. For the first time, the ³He/⁴He isotopic ratio can be measured simultaneously with the H/D/T ratio. This technique is of particular interest for ion cyclotron resonance frequency (ICRF) heating scenarios.

所述光学潘宁（或种-选择性潘宁）计技术被用于H的测量₂ / d ₂ / T ₂燃料同位素组成和他/ d ₂在聚变装置的中和的粒子排出浓度。在JET的第一次氘-campaign战役（DTE1）中，已经在JET中使用了光学笔检测系统，并已被ITER选择。为准备下一次DT活动，对分偏器诊断套件和光学仪器的最新改进提高了测量的光通量，并实现了³ He / D ₂检出率低至0.1％。首次可以同时测量³ He / ⁴ He同位素比率和H / D / T比率。对于离子回旋共振频率（ICRF）加热场景，此技术特别有用。