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

Cousineau, S.; Rakhman, A.; Kay, Martin; Aleksandrov, A.; Danilov, V.; Gorlov, Timofey; Liu, Yun; Plum, Michael; Shishlo, A.; Johnson, D.E.

doi:10.1103/physrevlett.118.074801

Cited by 22 publications

(14 citation statements)

References 10 publications

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“…The simulation utilizes the laser stripping model incorporated into the PYORBIT simulation code [10], and is based on the H 0 beam parameters from the last SNS experiment [4,5]. Figure 6 indicates that for the same excitation efficiency sequential scheme needs about 0.16 of the laser peak power required for the 1s → 3p excitation which agrees with the above estimations.…”

Section: A Analysis and Simulationsupporting

confidence: 62%

“…laser stripping, was introduced in [2], and further refined in subsequent works to overcome limitations caused by the inherent energy spread in the beam. The experimental evolution of the concept began in 2006 at the Spallation Neutron Source accelerator with a proof of principle demonstration [3] followed by a proof of practicality demonstration [4,5], both resulting in stripping efficiencies > 90%. Other similar approaches to laser stripping are also under development [6], but have not yet reached the experimental phase.…”

Section: Introductionmentioning

confidence: 99%

“…A minimum level of excited state 3p with n ¼ 3 is needed for Lorentz stripping of a 1 GeV beam because the electron is strongly bound to the atom in the lower excited state and cannot be Lorentz stripped by a conventional ≤ 2 T magnet. Thus, for the proof of principle and the proof of practicality experiments at the SNS [3][4][5], a 3rd harmonic UV laser with 355 nm wavelength was used for single step excitation (1s → 3p) of the 1 GeV H 0 beam. From the standpoint of laser technology, due to nonlinear frequency conversion process, the 3rd harmonic UV laser is often less powerful as compared to 2nd harmonic 532 nm laser or a fundamental 1064 nm laser and needs to be enhanced by an optical cavity.…”

Section: Introductionmentioning

confidence: 99%

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Sequential excitation scheme for laser stripping for a H− beam

Gorlov

Aleksandrov

Cousineau

et al. 2019

Phys. Rev. Accel. Beams

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A new scheme with sequential resonant excitation for laser assisted charge exchange injection of H − beams is proposed. In contrast with the one step excitation scheme, the proposed scheme requires significantly less laser power for high efficiency stripping. It also provides greater flexibility in the choice of laser wavelength for a given beam energy and extends the range of energies where laser stripping can be effectively applied. Calculations and experimental plans for 1.0 GeV and 1.3 GeV H − beams at the Spallation Neutron Source are presented. Results indicate that the sequential excitation scheme allows the use of more convenient green laser with much smaller power in place of the UV laser previously used.

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Section: A Analysis and Simulationsupporting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sequential excitation scheme for laser stripping for a H− beam

Gorlov

Aleksandrov

Cousineau

et al. 2019

Phys. Rev. Accel. Beams

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“…A transmission efficiency of 70% has been achieved. A successful stripping with > 90% efficiency has been demonstrated over a 10 s macropulse by using the developed laser and optical system [16]. We have also discussed the scalability of the present experiment to the parameters required for the full-cycle laser stripping.…”

Section: Resultsmentioning

confidence: 87%

“…A stripping over 10 mini-pulses of the H-beam has been observed with the maximum stripping efficiency close to 99%. Details of experimental results are reported in [16]. Here we briefly discuss the scalability of the present laser stripping scheme to a full-cycle Hbeam, e.g.…”

Section: Discussionmentioning

confidence: 99%

Laser and optical system for laser assisted hydrogen ion beam stripping at SNS

Liu

Rakhman

Menshov

et al. 2017

Nuclear Instruments and Methods in Physics Research Section A:

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Recently, a high-efficiency laser assisted hydrogen ion (H-) beam stripping was successfully carried out in the Spallation Neutron Source (SNS) accelerator. The experiment was not only an important step toward foil-less H-stripping for charge exchange injection, it also set up a first example of using megawatt ultraviolet (UV) laser source in an operational high power proton accelerator facility. This paper reports in detail the design, installation, and commissioning result of a macro-pulsed multimegawatt UV laser system and laser beam transport line for the laser stripping experiment.

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Charge-Exchange Technologies

Dudnikov

2019

Springer Series on Atomic, Optical, and Plasma Physics

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

Cited by 22 publications

References 10 publications

Sequential excitation scheme for laser stripping for a H− beam

Sequential excitation scheme for laser stripping for a H− beam

Laser and optical system for laser assisted hydrogen ion beam stripping at SNS

Charge-Exchange Technologies

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