H−charge-exchange injection without hazardous stripping foils

Abstract

A new scheme of H 2 charge-exchange injection without stripping foils is proposed. It is composed of a neutralizer of the H 2 beam using Lorentz stripping, the colliding system of a high power laser and the H 0 beam to excite H 0 atoms to the 3P state using the Rabi oscillation, and a magnet to strip the H 0 ͑3P͒ to a proton beam by Lorentz stripping. The necessary laser wavelength, laser power, magneticfield gradient, and maximum magnetic field are estimated for a beam energy from 1.0 to 3.0 GeV. The result shows that such a scheme is sufficiently feasible for H 2 beams with an energy discussed here.[S1098-4402(98)

First Demonstration of Laser-Assisted Charge Exchange for Microsecond Duration H− Beams

“…While in theory it is possible to remove the second electron using direct laser photo-detachment, it would require excessively high peak laser powers. Instead, a laser is used to produce resonant excitation of the remaining electron to a higher quantum state (H 0 *) with lower binding energy [5], and then it is Lorentz stripped by a second dipole magnet to produce a proton (H 0 * to p). The process is shown schematically in Fig.…”

Effective calculation of laser stripping via a broad shape resonance

“…At present, the possibility of laser assisted charge exchange injection of a high-energy hydrogen beam with the help of powerful laser and magnetic fields is widely discussed [1][2][3][4][5][6][7]. A wide review on laser stripping and its achievements can be found in [2,3,7].…”

Lorentz Laser-Assisted Stripping (Lolas) for H−/H0 Injection into Proton Drivers

“…For calculations and measurements of Lorentz stripping of H -s see refs [6][7][8] and [1]. Further relevant references are given in ref [4].…”

“…Because of space limitations we restrict to comments on the main components and critical parts of Lolas schemes, for which refs [1][2][3][4][5] give extended sets of references and the essential formulas.…”

“…Schemes for laser excitation and (simultaneous or subsequent) Lorentz stripping of H 0 atoms in the injection straight section of the accumulator of a proton driver have been worked out in Japan, Europe and USA [1][2][3][4][5]. The driving motivation is to design an injection without losses.…”