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WEP19 |
A Raster Scanning Laser-Sculptor for Hydrogen Ion Beam Diagnostics | |
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Funding: We acknowledge funding by the STFC Grant ST/P003028/1 and the John Adams Institute’ at Royal Holloway, University of London. A novel scheme for laser sculpting a neutralised hydrogen beam from a parent beam of hydrogen ions circulating in a racetrack accelerator was proposed at IPAC19*. Such a method was shown in simulation to produce a particle beam with reduced transverse emittance, based on a simple static laser sculptor geometry. This paper investigates effects of translating or raster scanning a focussed laser-sculptor transversely within the hydrogen ion beam, which creates new possibilities for non-invasive beam diagnostics of the transverse phase space. The optimisation of the optical geometry, intensity and the temporal characteristics of the laser beam are investigated for laser-induced extraction of neutralised beamlets, from which the beam profile and emittance can be reconstructed. Photo-detachment simulations are performed in a photon-particle interaction framework that has been implemented in BDSIM, a Geant4 based particle tracking code**. We evaluate the design of a potential experimental demonstration at a hydrogen ion linac, the Front End Test Stand, at Rutherford Appleton Laboratory, UK. * Laser sculpted cool proton beams, S. Gibson, S. Alden, L. Nevay. ** A simulation framework for photon-particle interactions for laserwires and further applications S. Alden, L. Nevay, S. Gibson |
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