Performance studies of Cryocooler based cryosorption pumps with indigenous activated carbons for fusion applications

26th International Cryogenic Engineering Conference & International Cryogenic Materials Conference 2016

材料科学;物理学

Kasthurirengan, S.^1 ; Vivek, G.A.^1,2 ; Verma, Ravi^1 ; Behera, Upendra^1 ; Udgata, Swarup^2 ; Gangradey, Ranjana^3

Centre for Cryogenic Technology, Indian Institute of Science, India^1

I-Design Engineering Solutions Ltd, India^2

Institute of Plasma Research, India^3

关键词: Cryosorption pumps;    Flow channels;    Fusion applications;    Fusion systems;    Harsh environment;    Liquid helium;    Performance evaluations;    Performance study;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/171/1/012055/pdf
DOI  :  10.1088/1757-899X/171/1/012055

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Cryosorption pumps are the only solution for pumping helium and hydrogen in fusion systems, due to their high pumping speeds and suitability in harsh environments. Their development requires the right Activated Carbons (ACs) and suitable adhesives to bind them to metallic panels with liquid helium (LHe) flow channels. However, their performance evaluation will require large quantities of LHe. Alternatively, these pumps can be built with small size panels adhered with ACs and cooled by a cryocooler. The paper describes the development of a cryopump using a commercial cryocooler (Sumitomo RDK415D), with 1.5W@4.2 K, integrated with small size AC panel mounted on 2ndstage, with the 1ststage acting as radiation shield. Under no load, the cryopump reaches the ultimate pressure of 2.1E-7 mbar. The pump is built using panels with different indigenously developed ACs such as granules, pellets, ACF-FK2 and activated carbon of knitted IPR cloth. We present the experimental results of pumping speeds for gases such as nitrogen, argon and helium using the procedures outlined by American Vacuum Society (AVS). These studies will enable to arrive at the right ACs and adhesives for the development of large scale cryosorption pumps with liquid helium flow.