An integrated chevron type cryopump system for the JET pumped divertor program consisting of two independent 180/spl deg/ elements has been operational at JET since mid 1994. The pumping speed of the pump in situ in the torus is /spl sim/200000 l/s being limited by the conductance of the water-cooled high heat flux elements in front of the cryopump. The LN shield provides a high pumping speed for impurities such as water and hydrocarbons. An argon spray facility enables the deposition of argon frost directly onto the cryopump and to pump He-gas by cryosorption. The pumping speed for He has been found to be nearly the same as for D/sub 2/. The operation of the pump has been very stable and unaffected by all kind of plasma operation conditions, disruptions or deposition of large quantities of argon. The operation of the cryopumps was so beneficial for the vacuum and the series of experimental programs that cryopumps were kept practically in permanent operation during the full 94/95 experimental campaign.
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机译:由两栋独立的180 / SPL型/元件组成的喷射泵送置换器程序的集成雪佛龙型冷冻泵系统在射流自1994年以来一直在运行。泵在圆环中泵的泵送速度为/ SPL SIM / 200000 L / S受到低温泵前面的水冷高热通量元件的电导的限制。 LN屏蔽为诸如水和烃等杂质提供高泵送速度。氩喷涂设施使氩气霜沉积直接进入低温泵并通过低温泵送He-Gas。已经发现他的泵送速度与D / SUB 2/2 /。泵的操作一直非常稳定,不受所有种类的等离子体操作条件,破坏或大量氩气的影响。低温泵的操作对于真空和一系列实验程序的操作是如此有益,并且在完整的94/95实验活动期间实际上在永久性运行中保持了一系列实验程序。
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