Noninvasive diagnostics for H− ion beams using photodetachment by a focused laser beam

Swenson, D.; MacKerrow, Edward P.; Bryant, H. C.

doi:10.1063/1.46991

Cited by 2 publications

(2 citation statements)

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“…Because the proton beam is low power, the diagnostic may totally intercept the protons. A laser beam for transverse beam diagnostics can either be a thin "laser wire", neutralizing only a thin slice of the incident Hbeam, or intercept the entire beam (8)(9)(10). The width of the laser wire can be of the order of 0.2 or 0.4 mm.…”

Section: Possible Experimental Layouts and Measurementsmentioning

confidence: 99%

Laser diagnostic for high current H[sup −] beams

Shafer

1998

AIP Conference Proceedings

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In the last 5 years, significant technology advances have been made in the performance, size, and cost of solid-state diode-pumped lasers. These developments enable the use of compact Q-switched Nd:YAG lasers as a beam diagnostic for high current Hbeams. Because the threshold for photodetachment is only 0.75 eV, and the maximum detachment cross section is 4 ˝ 10-17 cm 2 at 1.5 eV, A 50 mJ/pulse Q-switched Nd:YAG laser can neutralize a significant fraction of the beam in a single 10 ns wide pulse. The neutral beam maintains nearly identical parameters as the parent Hbeam, including size, divergence, energy, energy spread, and phase spread. A dipole magnet can separate the neutral beam from the Hbeam to allow diagnostics on the neutral beam without intercepting the high-current Hbeam. Such a laser system can also be used to extract a low current proton beam, or to induce fluorescence in partially stripped heavy ion beams. Possible beamline diagnostic systems will be reviewed, and the neutral beam yields will be calculated.

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Section: Possible Experimental Layouts and Measurementsmentioning

confidence: 99%

Laser diagnostic for high current H[sup −] beams

Shafer

1998

AIP Conference Proceedings

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“…A measurement which would collect the removed electrons was proposed by D.R. Swenson et al [9]. This paper reports on efforts to develop a laser profile monitor (LPM) at Brookhaven National Lab which measures the beam current notch created by the laser pulse [lo].…”

Section: Introductionmentioning

confidence: 99%

Laser Beam-Profile Monitor Development at BNL for SNS

Connolly¹,

Cameron²,

Cupolo³

et al. 2002

AIP Conference Proceedings

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Abstract. A beam profile monitor for H-beams based on laser photoneutralization is being developed at Brookhaven National Laboratory (BNL) for use on the Spallation Neutron Source (SNS) [l]. An H ion has a first ionization potential of 0.75eV and can be neutralized by light from a Nd:YAG laser (h=1064nm). To measure beam profiles, a narrow laser beam is passed through the ion beam neutralizing a portion of the H-beam struck by the laser. The laser trajectory is stepped across the ion beam. At each laser position, the reduction of the beam current caused by the laser is measured. A proof-of-principle experiment was done earlier at 750keV. This paper reports on measurements made on 200MeV beam at BNL and with a compact scanner prototype at Lawrence Berkeley National Lab on beam from the SNS RFQ.

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Noninvasive diagnostics for H− ion beams using photodetachment by a focused laser beam

Cited by 2 publications

References 0 publications

Laser diagnostic for high current H[sup −] beams

Laser diagnostic for high current H[sup −] beams

Laser Beam-Profile Monitor Development at BNL for SNS

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