Studies on the development of a curved superconducting solenoid magnet for the very intense ultra slow muon beam with high luminosity

高光强超慢μ介子束弯曲超导螺线管磁体的研制

• 批准号: 19206014
• 负责人: MIYAKE Yasuhiro
• 金额: $ 30.78万
• 依托单位: High Energy Accelerator Research Organization
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2007
• 资助国家: 日本
• 起止时间: 2007 至 2009
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-19206014/
• 关键词: ミュオン; 超低速ミュオン; 超伝導電磁石; GM冷凍機; J-PARC; 水素原子; 偏極; スピン; 低速ミュォン; 水素原

We are designing one super omega muon channel with a large acceptance of 400mSr for the study of thin film magnetism or negative muon physics in the MLF experimental hall No.～2. In the case of the super omega beam channel, we are going to install a large acceptance solenoid made of mineral insulation cables (MIC) and a superconducting curved transport solenoid. We can collect either surface or cloud muons with a large acceptance of 400mSr. Finally, we are expecting 4 $\times$ $10^{8}$ surface $\mu^{+}$/s and $10^{7}$ cloud $\mu^{-}$/s in the MLF experimental hall No.～2. Although many of these studies can be performed using either surface or decay muons, at the super omega channel we are aiming to create a new type of muon source : an intense ultra-slow muon source. Slow muons are generated through resonant ionization of muonium (Mu). Mu is formed by stopping an intense surface muon beam on the rear surface of a hot W foil. At the RIKEN/RAL muon facility, 20 slow $\mu^{+}$/s are obtained out of 1.2 $\times$ $10^{6}$ surface muons/s \cite{Pavel2008}. Taking into account the repetition rate of the pulsed laser system and the proton beam, as well as the surface muon ratio between RIKEN-RAL and J-PARC MUSE, we can expect 1.3 $\times$ $10^{4}$ slow $\mu^{+}$/s without any additional laser development. A rate of 1.3 $\times$ $10^{6}$ slow $\mu^{+}$/s can be achieved with additional laser development, such as the tripling of 366nm photons with pico second pulse width to match the Doppler broadening of the Mu at 2000K. By obtaining the budget of Kakenhi(Grants-in-Aid for scientific research) (A), we have completed a design for the curved superconducting magnet, which enables us to generate an very intense ultra slow muons.

我们正在MLF实验厅～2号设计一个具有400mSr大接收能力的超级欧米伽光束通道，用于薄膜磁学或负介子物理的研究。由矿物绝缘电缆 (MIC) 制成的大接收螺线管和超导弯曲传输螺线管我们可以收集表面或云 μ 介子，大接收量为 400mSr。预计MLF实验馆No.4 $\times$ $10^{8}$表面$\mu^{+}$/s和$10^{7}$云$\mu^{-}$/s~ 2. 虽然许多这些研究可以使用表面或衰变μ子进行，但在超级欧米伽通道，我们的目标是创建一种新型μ子源：通过共振电离产生强烈的超慢μ子源。 Mu 是通过在热 W 箔的后表面上停止强表面 μ 子束而形成的。在 RIKEN/RAL μ 子设施中，可以得到 20 慢 $\mu^{+}$/s。 1.2 $\times$ $10^{6}$ 表面μ子/s \cite{Pavel2008} 考虑到脉冲激光系统和质子束的重复率，以及表面μ子。 RIKEN-RAL 和 J-PARC MUSE 之间的比率，我们可以预期 1.3 $\times$ $10^{4}$ 慢 $\mu^{+}$/s，而无需任何额外的激光开发速率为 1.3 $\times$。通过额外的激光开发，可以实现 $10^{6}$ 慢 $\mu^{+}$/s，例如将 366nm 光子的皮秒脉冲宽度增加三倍以匹配多普勒通过获得Kakenhi（科学研究补助金）预算（A），我们完成了弯曲超导磁体的设计，这使我们能够产生非常强烈的超慢μ子。

项目成果

Muon Beams at the J-PARC Muon Facility and their application

J-PARC Mu 子设施的 Mu 子束及其应用

• 发表时间: 2009
• 期刊: IPS08“Pulsed Neutron and Muon Sciences, (2008), Nucl. Instr. and Meth. In Phys. Res. A 600
• 作者: 金泰雄;石川裕士;松下智紀;近藤高志;南出泰亜;O. Matsuda;Y. Miyake
• 通讯作者: Y. Miyake

Birth of an intense pulsed muon source, J-PARC MUSE

强脉冲μ子源 J-PARC MUSE 的诞生

• 发表时间: 2009
• 期刊: Physica B 404
• 作者: Y. Miyake;K. Shimomura;N. Kawamura;P. Strasser;S. Makimura;A. Koda;H. Fujimori;K. Nakahara;R. Kadono;M. Kato;S. Takeshita;K. Nishiyama;W. Higemoto;K. Ishida;T. Matsuzaki;Y. Matsuda;K. Nagamine
• 通讯作者: K. Nagamine

エキゾチック粒子で探る物質ナノ構造と物性

使用奇异粒子探索材料纳米结构和物理特性

• 发表时间: 2007
• 作者: Y. Higashi;K. Endo;et. al.;下村浩一郎
• 通讯作者: 下村浩一郎

J-PARC・MLFにおけるスーパーオメガミュオンビームライン

J-PARC/MLF 的超级欧米茄介子光束线

• 发表时间: 2009
• 作者: 中原一隆;三宅康博;下村浩一郎;Patrick Strasser;西山樟生;河村成肇;藤森寛;幸田章宏;永嶺謙忠;荻津透;山本明;佐々木憲一;田中賢一;足立秦平;木村誠宏;中本建志;石田勝彦;松田恭幸
• 通讯作者: 松田恭幸

固体物理

固体物理

• 发表时间: 2008
• 作者: 岩佐和晃;桑原慶太郎;神木正史
• 通讯作者: 神木正史