title: The new high field photoexcitation muon spectrometer at the ISIS pulsed neutron and muon source.
abstract: A high power pulsed laser system has been installed on the high magnetic field muon spectrometer (HiFi) at the International Science Information Service pulsed neutron and muon source, situated at the STFC Rutherford Appleton Laboratory in the UK. The upgrade enables one to perform light-pump muon-probe experiments under a high magnetic field, which opens new applications of muon spin spectroscopy. In this report we give an overview of the principle of the HiFi laser system and describe the newly developed techniques and devices that enable precisely controlled photoexcitation of samples in the muon instrument. A demonstration experiment illustrates the potential of this unique combination of the photoexcited system and avoided level crossing technique.
authors.affiliation: School of Physics and Astronomy, Queen Mary University of London, Mile End, London E1 4NS, United Kingdom.
authors.forename: K
authors.initials: K
authors.lastname: Yokoyama
authors.affiliation: ISIS, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom.
authors.forename: J S
authors.initials: JS
authors.lastname: Lord
authors.affiliation: School of Physics and Astronomy, Queen Mary University of London, Mile End, London E1 4NS, United Kingdom.
authors.forename: P
authors.initials: P
authors.lastname: Murahari
authors.affiliation: School of Physics and Astronomy, Queen Mary University of London, Mile End, London E1 4NS, United Kingdom.
authors.forename: K
authors.initials: K
authors.lastname: Wang
authors.affiliation: School of Physics and Astronomy, Queen Mary University of London, Mile End, London E1 4NS, United Kingdom.
authors.forename: D J
authors.initials: DJ
authors.lastname: Dunstan
authors.affiliation: ISIS, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom.
authors.forename: S P
authors.initials: SP
authors.lastname: Waller
authors.affiliation: ISIS, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom.
authors.forename: D J
authors.initials: DJ
authors.lastname: McPhail
authors.affiliation: ISIS, STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom.
authors.forename: A D
authors.initials: AD
authors.lastname: Hillier
authors.affiliation: Litron Lasers Ltd., Rugby CV21 1PB, United Kingdom.
authors.forename: J
authors.initials: J
authors.lastname: Henson
authors.affiliation: Litron Lasers Ltd., Rugby CV21 1PB, United Kingdom.
authors.forename: M R
authors.initials: MR
authors.lastname: Harper
authors.affiliation: School of Biological and Chemical Sciences, Queen Mary University of London, Mile End, London E1 4NS, United Kingdom.
authors.forename: P
authors.initials: P
authors.lastname: Heathcote
authors.affiliation: School of Physics and Astronomy, Queen Mary University of London, Mile End, London E1 4NS, United Kingdom.
authors.forename: A J
authors.initials: AJ
authors.lastname: Drew