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Thermal desorption diagnostics in the Uragan-2M stellarator
Fusion Engineering and Design ( IF 1.7 ) Pub Date : 2021-06-18 , DOI: 10.1016/j.fusengdes.2021.112716
G.P. Glazunov , D.I. Baron , S.M. Maznichenko , V.E. Moiseenko , M.N. Bondarenko , M.V. Gnidenko , V.Yu. Gribanov , A.L. Konotopskiy , Yu.V. Kovtun , M.M. Kozulya , A. Yu Krasyuk , V.M. Listopad , N.V. Limar , A.V. Lozin , F.I. Ozherelev , V.K. Pashnev , R.O. Pavlichenko , N.P. Ponomarenko , E.V. Syusko , A.I. Lyssoivan , T. Wauters , A. Goriaev , I.E. Garkusha

The improved thermal desorption diagnostics has been manufactured, installed and tested in the Uragan-2M (U-2M) stellarator [1], [2], [3], [4], [5] for in-situ characterisation a stainless steel (SS) wall outgassing rate and a number of molecular layers of residual gases on its surface in four different positions. The detailed description of this diagnostics, the location of thermal desorption stainless steel probes, the methodology of determining the outgassing rates and the number of molecular layers of residual gases on the probe surfaces are presented. It has been found that the difference between of the data taken from the probes being at different position in the U-2M vacuum chamber lies within the measurement accuracy. Using the present diagnostics together with the mass-spectrometer measurements, some studies were made to investigate the release of gases from the thermal desorption probes before and after radio frequency (RF) or glow discharge (GD) cleaning with hydrogen, helium and argon plasmas. It has been observed that hydrogen sorption by the SS probes surface during the discharge cleaning leads to significant hydrogen desorption even at the temperature of 250-300°C. In this case, hydrogen can be the one of the main gases which desorbs. After U-2M glow discharge cleaning with Ar plasma, the thermal desorption experiment has shown Ar as a significant component which is desorbed from the SS probe surface. Two kinds of desorbed Ar were registered with two different activation energies. The characteristics of the U-2M vacuum system are presented, too, including the block scheme, the list of pumps used to attain the ultimate vacuum, the equipment for measuring the total and partial pressures of residual gases.



中文翻译:

Uragan-2M仿星器中的热解吸诊断

已在 Uragan-2M (U-2M) 仿星器 [1]、[2]、[3]、[4]、[5]制造、安装和测试改进的热解吸诊断,用于原位表征不锈钢 (SS) 壁的除气速率和其表面四个不同位置的许多残余气体分子层。介绍了此诊断的详细说明、热解吸不锈钢探针的位置、确定脱气率的方法以及探针表面上残留气体的分子层数。已经发现,从U-2M真空室中不同位置的探针获取的数据之间的差异在于测量精度。使用目前的诊断和质谱仪测量,进行了一些研究,以调查在射频 (RF) 或辉光放电 (GD) 用氢气清洁前后热解吸探头中的气体释放,氦和氩等离子体。已经观察到,即使在 250-300°C 的温度下,放电清洁过程中 SS 探针表面的氢吸附也会导致显着的氢解吸。在这种情况下,氢气可以是解吸的主要气体之一。在用 Ar 等离子体进行 U-2M 辉光放电清洁后,热解吸实验表明 Ar 是从 SS 探针表面解吸的重要成分。以两种不同的活化能记录了两种解吸的 Ar。还介绍了 U-2M 真空系统的特点,包括方框图、用于达到极限真空的泵列表、测量残余气体总压和分压的设备。已经观察到,即使在 250-300°C 的温度下,放电清洁过程中 SS 探针表面的氢吸附也会导致显着的氢解吸。在这种情况下,氢气可以是解吸的主要气体之一。在用 Ar 等离子体进行 U-2M 辉光放电清洁后,热解吸实验表明 Ar 是从 SS 探针表面解吸的重要成分。以两种不同的活化能记录了两种解吸的 Ar。还介绍了 U-2M 真空系统的特点,包括方框图、用于达到极限真空的泵列表、测量残余气体总压和分压的设备。已经观察到,即使在 250-300°C 的温度下,放电清洁过程中 SS 探针表面的氢吸附也会导致显着的氢解吸。在这种情况下,氢气可以是解吸的主要气体之一。在用 Ar 等离子体进行 U-2M 辉光放电清洁后,热解吸实验表明 Ar 是从 SS 探针表面解吸的重要成分。以两种不同的活化能记录了两种解吸的 Ar。还介绍了 U-2M 真空系统的特点,包括方框图、用于达到极限真空的泵列表、测量残余气体总压和分压的设备。氢气可以是解吸的主要气体之一。在用 Ar 等离子体进行 U-2M 辉光放电清洁后,热解吸实验表明 Ar 是从 SS 探针表面解吸的重要成分。以两种不同的活化能记录了两种解吸的 Ar。还介绍了 U-2M 真空系统的特点,包括方框图、用于达到极限真空的泵列表、测量残余气体总压和分压的设备。氢气可以是解吸的主要气体之一。在用 Ar 等离子体进行 U-2M 辉光放电清洁后,热解吸实验表明 Ar 是从 SS 探针表面解吸的重要成分。以两种不同的活化能记录了两种解吸的 Ar。还介绍了 U-2M 真空系统的特点,包括方框图、用于达到极限真空的泵列表、测量残余气体总压和分压的设备。

更新日期:2021-06-18
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