Short bursts (∼1ms) of gas, injecting ∼10¹⁷–10¹⁸ molecules of hydrogen and/or deuterium, lead to the observation of cold pulse propagation phenomenon in hydrogen plasmas of the ADITYA-U tokamak. After every injection, a sharp increase in the chord-averaged density is observed followed by an increase in the core electron temperature. Simultaneously, the electron density and temperature decrease at the edge. All these observations are characteristics of cold pulse propagation due to the pulsed gas application. The increase in the core temperature is observed to depend on the values of both the chord-averaged plasma density at the instant of gas-injection and the amount of gas injected below a threshold value. Increasing the amount of gas-puff leads to higher increments in the core-density and the core-temperature. Interestingly, the rates of rise of density and temperature remain the same. The gas-puff also leads to a fast decrease in the radially outward electric field together with a rapid increase in the loop-voltage suggesting a reduction in the ion-orbit loss and an increase in Ware-pinch. This may explain the sharp density rise, which remains mostly independent of the toroidal magnetic field and plasma current in the experiment. Application of a subsequent gas-puff before the effect of the previous gas-pulse dies down, leads to an increase in the overall electron density and consequently the energy confinement time.

短时间爆发 (∼1ms) 的气体，注入 ∼10 ¹⁷ –10 ¹⁸氢和/或氘分子导致在 ADITYA-U 托卡马克的氢等离子体中观察到冷脉冲传播现象。每次注入后，观察到弦平均密度急剧增加，随后核心电子温度增加。同时，边缘处的电子密度和温度降低。由于脉冲气体应用，所有这些观察结果都是冷脉冲传播的特征。观察到核心温度的增加取决于气体注入瞬间的弦平均等离子体密度和低于阈值的注入气体量的值。增加喷气量会导致核心密度和核心温度的更高增量。有趣的是，密度和温度的上升率保持不变。喷气还导致径向向外电场的快速降低以及回路电压的快速增加，这表明离子轨道损失的减少和 Ware-pinch 的增加。这可以解释密度急剧上升，这在实验中主要与环形磁场和等离子体电流无关。在先前的气体脉冲的影响减弱之前应用随后的气体喷射，导致总电子密度的增加，从而导致能量限制时间的增加。在实验中，它基本上与环形磁场和等离子体电流无关。在先前的气体脉冲的影响减弱之前应用随后的气体喷射，导致总电子密度的增加，从而导致能量限制时间的增加。在实验中，它基本上与环形磁场和等离子体电流无关。在先前的气体脉冲的影响减弱之前应用随后的气体喷射，导致总电子密度的增加，从而导致能量限制时间的增加。