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; 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.

我们正在设计一个超级欧米茄MUON通道，在MLF实验大厅No.〜2中，用于研究薄膜磁性或负MUON物理的400MSR的大量接受。在超级欧米茄梁通道的情况下，我们将安装由矿物绝缘电缆（MIC）和超导弯曲的弯曲传输螺线管制成的大型接收螺线管。我们可以收集以400MSR的大量接受收集表面或云隆隆。最后，我们期望4 $ \ times $ $ 10^{8} $ surface $ \ mu^{+} $/s和$ 10^{7} $ cloud $ \ mu^mu^{ - } $/s在MLF实验厅编号〜2。尽管可以使用表面或衰减的μ子进行许多研究，但是在超级欧米茄通道，我们旨在创建一种新型的MUON来源：强烈的超慢湿度源。慢速μ子是通过隆隆（MU）的谐振电离产生的。 MU是通过停止在热W箔的后表面上停止强烈的表面启动束来形成的。在Riken/ral Muon设施中，获得20个慢$ \ mu^{+} $/s，以1.2 $ \ times $ $ 10^{6} $ surface muons/s \ cite {pavel2008}获得。考虑到脉冲激光系统和质子光束的重复速率，以及Riken-ral和J-Parc Muse之间的表面MUON比率，我们可以期望1.3 $ \ times $ 10^{4} $ slow $ \ mu^{+mu^{+} $/s/s没有任何其他激光开发。通过额外的激光开发，可以实现1.3 $ \ times $ $ 10^{6} $ slost $ \ mu^{+} $/s，例如，具有pico第二脉冲宽度的366nm照片的三倍张照片，以匹配2000k Mu的多普勒的多普勒扩展。通过获得Kakenhi的预算（科学研究的赠款）（a），我们已经完成了曲面超导磁铁的设计，这使我们能够产生非常强烈的超慢穆斯。