Best C<SUP>4+</SUP> and C<SUP>5+</SUP> Beams of the Kei2 ECR Ion Source

A.G.Drentje; M.Muramatsu; A.Kitagawa

Chinese Physics C> 2007, Vol. 31> Issue(S1) : 94-96

Best C⁴⁺ and C⁵⁺ Beams of the Kei2 ECR Ion Source

National Institute of Radiological Sciences, Chiba 263-8555, Japan

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Abstract：
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 of "special" gas- 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.

References

[1]

. Muramatsu M et al. Rev. Sci. Instrum., 2004, 75: 19252. Muramatsu M et al. Rev. Sci. Instrum., 2005, 76: 1133043. Drentje G, Muramatsu M, Kitagawa A. Rev. Sci. Instrum.,2006, 77: 03B7014. Drentje G. Rev. Sci. Instrum., 2003, 74: 26315. Kitagawa et al. Rev. Sci. Instrum., 2004, 75: 1476; Kitagawa A et al. Rev. Sci. Instrum., 2000, 71: 10616. Biri S, Vamosi J. Rev. Sci. Instrum., 1998, 69: 646; Biri S et al. Rev. Sci. Instrum., 2002, 73: 881

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A.G.Drentje, M.Muramatsu and A.Kitagawa. Best C⁴⁺ and C⁵⁺ Beams of the Kei2 ECR Ion Source[J]. Chinese Physics C, 2007, 31(S1): 94-96.

A.G.Drentje, M.Muramatsu and A.Kitagawa. Best C⁴⁺ and C⁵⁺ Beams of the Kei2 ECR Ion Source[J]. Chinese Physics C, 2007, 31(S1): 94-96. shu

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Received: 2007-05-30
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

Best C⁴⁺ and C⁵⁺ Beams of the Kei2 ECR Ion Source

Corresponding author: A.G.Drentje,

National Institute of Radiological Sciences, Chiba 263-8555, Japan

Received Date: 2007-05-30
Accepted Date: 1900-01-01
Available Online: 2007-01-03

Abstract: 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 of "special" gas- 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.