Development of thick hybrid-type carbon stripper foils with high durability at 1800 K for RCS of J-PARC
Development of thick hybrid-type carbon stripper foils with high durability at 1800 K for RCS of J-PARC
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DOI：
10.1016/j.nima.2005.12.225
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发表时间：
2006-05
影响因子：
1.4
通讯作者：
I. Sugai;Y. Takeda;M. Oyaizu;H. Kawakami;Y. Irie;Y. Arakida;K. Hara;H. Hattori;K. Kawasaki;J. Kamiya;M. Kinsho;K. Kuramochi
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文献类型：
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作者：
I. Sugai;Y. Takeda;M. Oyaizu;H. Kawakami;Y. Irie;Y. Arakida;K. Hara;H. Hattori;K. Kawasaki;J. Kamiya;M. Kinsho;K. Kuramochi
日本质子加速器研究复合体（J-PARC）需要厚的碳剥离箔（250-500μg/cm 2），以在注入快速循环同步加速器（RCS）之前从直线加速器提供的H−束中剥离电子。来自直线加速器的200 MeV H−束脉冲长度为0.5ms，重复频率为25 Hz，平均束流为335μA。对于这种高能量和高强度的光束，传统的碳剥离箔将在很短的时间内破裂，甚至金刚石箔也将在1800 K左右被MW级加速器破裂。因此，厚的碳剥离箔，在1800 K的高耐久性的能量沉积在箔中产生的是必不可少的，这种加速器。为此，我们用可控直流和AC/DC电弧放电方法研制了350μg/cm ~ 2的碳剥离箔。最近，我们已经成功地开发了混合型厚掺硼碳剥离箔，这不仅表现出极大的改善寿命，但也相对于在高温下的厚度减少和收缩在长束照射。本文介绍了用3.2MeV，Ne ~+束流制备的过程和寿命测量。
The Japan-Proton Accelerator Research Complexes (J-PARC) requires thick carbon stripper foils (250–500μg/cm2) to strip electrons from the H−beam supplied by the linac before injection into the Rapid Cycling Synchrotron (RCS). The 200MeV H−beam from the linac has a pulse length of 0.5ms with a repetition rate of 25Hz and an average beam current of 335μA. For this high-energy and high-intensity beam, conventional carbon stripper foils will break in a very short time and even a diamond foil will be ruptured at around 1800K by the MW class accelerator. Thus, thick carbon stripper foils with high durability at 1800K produced by energy deposition in the foil are indispensable for this accelerator. For this purpose, we have been developing carbon stripper foils of 350μg/cm2by means of both the controlled DC and AC/DC arc-discharge methods. Recently, we have successfully developed hybrid type thick boron-doped carbon stripper foils, which showed a drastic improvement not only with respect to the lifetime, but also with respect to thickness reduction and shrinkage at high temperature during long beam irradiation. In this report the preparation procedure and lifetime measurements with a 3.2MeV, Ne+beam are presented.