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SUMMARY:Intense Lyman-alpha light source for ultra-slow muon generation
DTSTART;VALUE=DATE-TIME:20220830T164000Z
DTEND;VALUE=DATE-TIME:20220830T170000Z
DTSTAMP;VALUE=DATE-TIME:20220826T120635Z
UID:indico-contribution-3798@indico.stfc.ac.uk
DESCRIPTION:Speakers: Yu OISHI (KEK/J-PARC)\nReduction of the momentum wid
 th in the muon beam is required in particle physics and material science. 
 A small-momentum-width muon beam so called ultra-slow muon beam can be rea
 lized by laser ionization of muonium which can be produced by stopping of 
 surface muons in a solid target and thermally diffusing them. Such an ultr
 a-slow muon generation technique reduces the momentum width to about 100 m
 eV. The application of this ultra-slow muon beam to µSR measurement will 
 enable to measuring of the physical properties from the surface to the int
 erface of materials more clearly with extremely high depth resolution. In 
 order to efficiently generate ultra-slow muons\, two coherent lights are r
 equired: the so called Lyman-alpha light\, which resonantly excites muoniu
 m from the ground state to 2p\, and the 355 nm light\, which ionizes excit
 ed muonium to the unbound state. In particular\, the generation of intense
  Lyman-alpha coherent light for resonant excitation is a challenging task 
 in laser technology because the wavelength of the Lyman-alpha light is in 
 vacuum ultraviolet. At  J-PARC MLF the Ultra-Slow Muon beamline\, we have 
 successfully generated muonium resonant Lyman-alpha coherent light exceedi
 ng 10 µJ using an all-solid-state laser and high-efficiency vacuum ultrav
 iolet light generation technologies\, and we have applied the Lyman-alpha 
 light to the generation of ultra-slow muons. In this presentation\, we wil
 l describe the current status of our intense Lyman-alpha light source\, an
 d future upgrade of the light source will be presented.\n\nhttps://indico.
 stfc.ac.uk/event/53/contributions/3798/
LOCATION:Science and Technology Campus\, University of Parma
URL:https://indico.stfc.ac.uk/event/53/contributions/3798/
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