Brightness enhancement method for a high-intensity positron beam produced by an electron accelerator

被引：50

作者：

Oshima, Nagayasu ^{[1
]}

Suzuki, Ryoichi ^{[1
]}

Ohdaira, Toshiyuki ^{[1
]}

Kinomura, Atsushi ^{[1
]}

Narumi, Takamitsu ^{[2
]}

Uedono, Akira ^{[2
]}

Fujinami, Masanori ^{[3
]}

机构：

[1] Natl Inst Adv Ind Sci & Technol, RIIF, Tsukuba, Ibaraki 3058568, Japan

[2] Univ Tsukuba, Inst Appl Phys, Tsukuba, Ibaraki 3058573, Japan

[3] Chiba Univ, Dept Appl Chem, Chiba 2638552, Japan

来源：

JOURNAL OF APPLIED PHYSICS | 2008年 / 103卷 / 09期

基金：

日本科学技术振兴机构;

关键词：

D O I：

10.1063/1.2919783

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A method for enhancing the brightness of an intense slow positron beam produced by an electron linear accelerator (LINAC) in order to obtain an intense positron microbeam was developed. The developed brightness enhancement system is simple and consists only of a few beam optics and a transmission remoderator. The slow positron beam produced by the LINAC is magnetically guided from the positron source to an experimental room. The beam is extracted from the magnetic field and is focused by a lens on the remoderator to enhance its brightness. The brightness-enhanced beam is extracted from the remoderator and focused on a sample by a lens. The beam size at the sample was 90 mu m, which was two orders of magnitude smaller than that in the magnetic transport system that was about 10 mm. The efficiency of the transmission remoderator was about 5%. Adiabatic rules in the magnetic transport and the paraxial-ray equation were used to estimate the beam size that could be produced using this method. (C) 2008 American Institute of Physics.

引用

页数：7

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