Abstract
Direct ionization of hydrogen atoms by laser irradiation is investigated as a potential new scheme to generate proton beams without stripping foils. The time-dependent Schrödinger equation describing the atom-radiation interaction is numerically solved obtaining accurate ionization cross-sections for a broad range of laser wavelengths, durations and energies. Parameters are identified where the Doppler frequency up-shift of radiation colliding with relativistic particles can lead to efficient ionization over large volumes and broad bandwidths using currently available lasers.
Highlights
May 2015Any further distribution of the atom-radiation interaction is numerically solved obtaining accurate ionization cross-sections for a this work must maintain attribution to the broad range of laser wavelengths, durations and energies
We show that direct ionization of hydrogen can be a viable single-step stripping method, since in the rest frame of an atom moving at relativistic speed a colliding infrared laser can be Doppler shifted to UV frequencies where photo-ionization is highly efficient at intensities achievable with commercially available lasers
Since accurate ionization cross-sections are not known in the UV region for a wide range of frequencies and pulse durations, we have conducted an extensive numerical study by solving the timedependent Schrödinger equation (TDSE) governing the atom-radiation interaction, exploring the properties of one-photon to five-photon ionization and discussing possible applications to laser stripping, using as a test case the beam parameters of Project X, a proton accelerator which was proposed at Fermilab [16]
Summary
Any further distribution of the atom-radiation interaction is numerically solved obtaining accurate ionization cross-sections for a this work must maintain attribution to the broad range of laser wavelengths, durations and energies. Parameters are identified where the Doppler author(s) and the title of the work, journal citation frequency up-shift of radiation colliding with relativistic particles can lead to efficient ionization over and DOI. Large volumes and broad bandwidths using currently available lasers
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