26th National Symposium on Cryogenics and Superconductivity

22-24 February 2017

VECC

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A prototype experiment on Cryocooler based Cryopump

Content:

To characterize the ion and neutral Beam produced from the 100 keV, 60 A Beam Source for application in the Diagnostics Neutral Beam (DNB) for ITER, an installed pumping of 1.2 x 106 l/s is required to ensure low loss of ions due to stripping and low re-ionisation loss. Such large pumping speeds are provided using in-situ pumping. In the present case, 12 cryo pumps based on Cryo-sorption mode of operation are dispersed symmetrically along the 9 m length of the test vessel. Each pump has a speed of ~ 1 x 105 l/s and the pressure profile obtained from the positioning is obtained using a Monte Carlo Gas Flow (MCGF) code. The engineering configuration of the pumps is Chevron baffles having overall dimension of 3 m in height, 0.6 m in width and 0.3 m in depth. The Chevron baffles operate at ~ 85 K. The pumping surface is a charcoal coated (2.8 m height x 0.3 m width) Helium panel, where pumping from both sides are affected on the 15 K panel. Manufacturing of the pump is based on vacuum brazing, for which, the process qualification has been concluded. The heat loads on the Helium section of the pump is ~ 20 W, taking into account the loads due to radiation, gas loads and gas conduction. The cooling of the 85 K section is carried out using (Liquid Nitrogen) LN2 from a central supply. The Helium section cooling shall be cryocooler based. An experimental validation of the temperature distribution on the Helium surface has been carried out on a prototype using a 20 W @ 15 K cryocooler (Sumitomo make). The experiment establishes temperature uniformity within 0.5 K at the extremities of the Helium panel for heat loads that is a factor of 2 higher than the estimates, and closely corroborates the simulation data, thereby ensuring a reliable pumping performance. The results of the prototype experiment leads to a technical decision of incorporating 12 cryocooler based cooling for the Helium section, thereby obviating the need for a dedicated 15 K Gaseous Helium Supply System. The paper shall present a brief configuration of the cryopump, the details of the prototype, the experimental results and the conclusions arrived at.

Id:

104

Place:

VECC

1/AF, Bidhan Nagar Kolkata - 700008

Room: Hall B (Annex Auditorium)

Starting date:

24-Feb-2017

12:45 (Asia/Kolkata)

Duration:

15'

Contribution type:

Contributory Talk

Primary Authors:

Mr. MILINDKUMAR PATEL, Milindkumar (ITER-India, IPR)

Co-Authors:

Mr. ARUN KUMAR CHAKRABORTY, Arun Kumar (ITER-India, IPR)
Mr. KAUSHAL PANDYA, Kaushal (IPR)
Mr. KARSHAN PRAJAPATI, Karshan (Bhakti Management Services Pvt. Ltd)
Mr. DARSHAK SHAH, Darshak (Bhakti Management Services Pvt. Ltd)
Mr. SHOBHIT TRAPASIYA, Shobhit (Bhakti Management Services Pvt. Ltd)
Mr. HIMANSHU PRAJAPATI, Himanshu (Bhakti Management Services Pvt. Ltd)
Mr. TEJ TRIVEDI, Tej (Bhakti Management Services Pvt. Ltd)
Mr. KUNVAR S., Kunvar (Bhakti Management Services Pvt. Ltd)
Mr. MAINAK BANDYOPADHYAY, Mainak (ITER-India, IPR)
Mr. CHANDRAMOULI ROTTI, Chandramouli (ITER-India, IPR)
Mr. DEEPAK PARMAR, Deepak (ITER-India, IPR)
Mr. HARDIK SHISHANGIYA, Hardik (ITER-India, IPR)
Mr. HIMANSHU TYAGI, Himanshu (ITER-India, IPR)
Mr. RATNAKAR YADAV, Ratnakar (ITER-India, IPR)
Mr. KARTIK PATEL, Kartik (IPR)
Mr. HIREN MISTRY, Hiren (IPR)

Presenters:

Mr. MILINDKUMAR PATEL, Milindkumar

Material:

paper

Included in session:

Technical Session 11

Included in track:

Cryocoolers / Cryopumps / Cryogenics Systems