Document Detail

Cooling of extraction electrode of an ion source in long-pulse operation.
MedLine Citation:
PMID:  18699409     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Experimental studies were made on the cooling of extraction electrodes of an ion source in the case of long-pulse operation. Copper electrodes with forced water cooling pipes were tested under the condition that an ion beam of 1 to 5 A at 30 keV was extracted for up to 10 s. The average heat loading to the grid are of the electrode was as high as 130 W/cm2. This high heat flux was obtained by a set of electrodes artificially arranged to produce poor beam optics, and hence the high heat loading. Temperature of the ground electrode was measured at two points by thermocouples buried and silver brazed in it, and was kept below 230 degrees C due to a large boiling heat transfer coefficient of the cooling water. No evidences of deformation or deterioration of the electrodes was observed after repetitious beam extraction. This heat loading was still a half of that on the grid of the ion source for the JT-60 NBI.
H Horiike; U Kondoh; H Morita; H Shirakata; T Sugawara; S Tanaka
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Review of scientific instruments     Volume:  50     ISSN:  0034-6748     ISO Abbreviation:  Rev Sci Instrum     Publication Date:  1979 Nov 
Date Detail:
Created Date:  2008-08-13     Completed Date:  2008-09-17     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0405571     Medline TA:  Rev Sci Instrum     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1453     Citation Subset:  -    
Division of Thermonuclear Fusion Research, Japan Atomic Energy Research Institute Tokai, Ibaraki, Japan.
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