NDLI: High vacuum cryocondensation pumping of the ITER cryostat

Content Provider	IEEE Xplore Digital Library
Author	Wykes, M. Mack, A. Day, C. Antipenkov, A. Murdoch, D. Marrs, R.
Copyright Year	2003
Description	Author affiliation: ITER JWS, Garching, Germany (Wykes, M.)
Abstract	Prior to cool-down of the ITER magnet system, the enveloping cryostat has to be evacuated to a low enough pressure to reduce gas convection and conduction heat loads to the magnet structures to an acceptable level (/spl sim/-0.1 mPa). In order to standardize cryopump designs to the greatest extent practical, the design of the cryostat high vacuum (HV) cryopump used for this evacuation is almost identical to that of the cryosorption pumps used for the torus primary pumping system, but without the cryosorbent (cryocondensation pumping). Additionally, the pump location has been moved from that described in the 2001 Final Design Report (under the cryostat lid) and is now at the lower port level, closer to the cryo-supply manifolds, thereby facilitating rationalization of the cryodistribution system. On account of the large area of warm vacuum-facing surfaces within the cryostat, including epoxy, the cryocondensation pumpdown is dominated by outgassing (helium within the cryostat vacuum envelope, resulting from small leaks in the liquid helium magnet coolant piping, is pumped by separate cryosorption refrigerator pumps). The pumpdown performance is assessed from a closed solution of the time-dependent gas balance, wherein the transient pressure is given by a power series of the elapsed time, the coefficients being functions of the effective pumping speed, 1 hour outgassing rate, and logarithmic decay index. It is shown that the series solution is convergent in the time domain of practical interest. We present the evolution of the cryostat pressure for various outgassing characteristics and demonstrate that the pumping provision is adequate, even under adverse outgassing scenarios.
Starting Page	135
Ending Page	139
File Size	1112615
Page Count	5
File Format	PDF
ISBN	078037908X
DOI	10.1109/FUSION.2003.1426606
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-10-14
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Helium Magnetic separation Heat pumps Vacuum systems Valves Superconducting magnets Coolants Cryogenics Infrared heating Optical arrays
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Design of the ITER TF Magnet Feeder Systems

Cryostat design for the Superconducting Super Collider 50 mm aperture dipole magnet

Cryogenic Engineering Design of the ITER Superconducting Magnet Feeders

The ITER cryostat

Design Approach and Analysis Results for Structure Feeders of ITER Magnets

A Review Of Magnetic Heat Pump Technology

DIII-D cryogenics control system status

Design of mechanical structure and cryostat for IASW superconducting wiggler at NSRRC

D-Zero Cryogenic System VLPC & Solenoid Vacuum System Instrumentation, Control, and Logic

High vacuum cryocondensation pumping of the ITER cryostat

Similar Documents

Design of the ITER TF Magnet Feeder Systems

Cryostat design for the Superconducting Super Collider 50 mm aperture dipole magnet

Cryogenic Engineering Design of the ITER Superconducting Magnet Feeders

The ITER cryostat

Design Approach and Analysis Results for Structure Feeders of ITER Magnets

A Review Of Magnetic Heat Pump Technology

DIII-D cryogenics control system status

Design of mechanical structure and cryostat for IASW superconducting wiggler at NSRRC

D-Zero Cryogenic System VLPC & Solenoid Vacuum System Instrumentation, Control, and Logic

High vacuum cryocondensation pumping of the ITER cryostat