Pulsed source of ultra low energy positive muons for near-surface μSR studies

Bakule, Pavel; Matsuda, Y.; Miyake, Yasuhiro; Nagamine, K.; Iwasaki, M.; Ikedo, Yutaka; Shimomura, K.; Strasser, P.; Makimura, Shunsuke

doi:10.1016/j.nimb.2007.11.009

Cited by 57 publications

(15 citation statements)

References 20 publications

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“…Ultra-slow positive muons can be used for local magnetic microprobes for nanoscale solid state physics, material and life sciences. [7][8][9][10][11][12][13] Research and development for generation of VUV and L-α radiation by laser wave mixing in gases has been continued over few decades generating many significant advances. [14][15][16][17][18][19][20][21][22][23] In continuing this work we could recently achieve high-efficiency operation with high beam quality in ns pulsed generation of hydrogen L-α radiation by using the high-intensity input radiation and avoiding the onset of the full-scale discharge of Kr-Ar gas in the laser focus.…”

Section: Introductionmentioning

confidence: 99%

Photoionization pathways and thresholds in generation of Lyman-α radiation by resonant four-wave mixing in Kr-Ar mixture

et al. 2016

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We develop a set of analytical approximations for the estimation of the combined effect of various photoionization processes involved in the resonant four-wave mixing generation of ns pulsed Lyman-α (L-α) radiation by using 212.556 nm and 820-845 nm laser radiation pulses in Kr-Ar mixture: (i) multi-photon ionization, (ii) step-wise (2+1)-photon ionization via the resonant 2-photon excitation of Kr followed by 1-photon ionization and (iii) laser-induced avalanche ionization produced by generated free electrons. Developed expressions validated by order of magnitude estimations and available experimental data allow us to identify the area for the operation under high input laser intensities avoiding the onset of full-scale discharge, loss of efficiency and inhibition of generated L-α radiation. Calculations made reveal an opportunity for scaling up the output energy of the experimentally generated pulsed L-α radiation without significant enhancement of photoionization.

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Section: Introductionmentioning

confidence: 99%

Photoionization pathways and thresholds in generation of Lyman-α radiation by resonant four-wave mixing in Kr-Ar mixture

et al. 2016

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“…Positive muons can be implanted at controlled depths on a nano-meter scale [23,27,28], and research progresses in slowing down negative muons, known as muon cooling, to a similar degree [24,26,29]. Of interest is 'a moderator consisting of a large number of thin carbon foils placed perpendicularly to the axis of a high-field solenoid' [26].…”

Section: Current Technology/researchmentioning

confidence: 99%

A modified approach to muon-catalyzed fusion, employing helium-3 as fuel

Egan¹

2012

Nuclear Instruments and Methods in Physics Research Section B:

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“…An ultra-slow muon beam, which has been developed at KEK-MSL and RIKEN/RAL since 1995, will be utilized for promoting various advanced researches [1,2]. Positive muons, generated in the primary proton beam line and transported to a chamber for generation of ultra-slow muons, are introduced into a hot tungsten foil at 2000 degrees Kelvin.…”

Section: Introductionmentioning

confidence: 99%

Development of Manufacturing Method of Highly Pure Tungsten Foil for Thermal Muonium Generation

Makimura¹,

Onoi²,

Wakasugi³

et al. 2014

Proceedings of the International Symposium on Science Explored by Ultra Slow Muon (USM2013)

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An ultra-slow muon beam, which has been developed in KEK-MSL and RIKEN/RAL since 1985, will be utilized for promoting the various advanced researches. Positive muons are generated in the primary proton beam line, and introduced into a tungsten foil which is heated at 2000K Positive muons will capture electrons and will be converted into muoniums. Then the thermal muoniums are evaporated into an ultra-high vacuum and ionized by a laser ionization method. A highly pure tungsten foil is essential, because the clean surface of tungsten is required to obtain the intense muoniums. Unfortunately, the companies, which had supplied the highly pure (6 N-99.9999 %) tungsten foil, discontinued the manufacturing. It used to be manufactured by a hot rolling technique of the highly pure tungsten bulk material. Therefore the development of manufacturing methods was started instead of fabricating the new and expensive hot rolling apparatus. To know the feasibility of the manufacturing, several decades of 0.2-mm thick plates made of ordinarily pure tungsten material (3 N-99.95%) was utilized. Then, the thickness is reduced up to 50 µm by two methods, the etching and the mechanical polishing respectively. As the results, uniform 50-µm thick foils could be successfully obtained by the mechanical polishing. As the next step, the successful mechanical polishing was introduced to the highly pure tungsten bulk. In this article, the development of the manufacturing method of the highly pure tungsten foil for thermal muonium generation will be described.

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Pulsed source of ultra low energy positive muons for near-surface μSR studies

Cited by 57 publications

References 20 publications

Photoionization pathways and thresholds in generation of Lyman-α radiation by resonant four-wave mixing in Kr-Ar mixture

Photoionization pathways and thresholds in generation of Lyman-α radiation by resonant four-wave mixing in Kr-Ar mixture

A modified approach to muon-catalyzed fusion, employing helium-3 as fuel

Development of Manufacturing Method of Highly Pure Tungsten Foil for Thermal Muonium Generation

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