Best C4+ and C5+ Beams of the Kei2 ECR Ion Source
With the prototype ECR ion source for the next carbon therapy facility in Japan a new series of measurements has been performed in order(a)to find the highest beam currents of C4+ ions,and(b)to study the effect ofspecialgas-mixing by using a chemical compound as a feed gas. An isotopic effect has been found in a previous experiment:with deuterated methane(CD4 gas)the C5+ beam currents are about 10％ higher than with regular methane(CH4 gas).For butane gases(C4D10 and C4H10 respectively)the isotopic effect for C5+ production is even stronger(>15％).For production of C4+ ions the isotopic effect appears to be absent.It turns out that the relative amount of carbon is much more important:acetylene gives 15％higher C4+ current than butane,which in turn gives about 10％ higher C4+ ion currents than methane.
carbon ions ECR ion source isotopic effect gas-mizing
A.G.Drentje M.Muramatsu A.Kitagawa
国际会议
The 17th International Workshop on ECR Ion Sources and Their Application(第17届国际ECR离子源研讨会)
兰州
英文
94-96
2006-09-17（万方平台首次上网日期，不代表论文的发表时间）