Experimental study of proton-beam halo induced by beam mismatch in LEDA

Wangler, T.P.; Allen, C.K.; Chan, K.C.D.; Colestock, P.L.; Crandall, K.R.; Garnett, R.W.; Gilpatrick, D.; Lysenko, W. P.; Qiang, Ji; Schnieder, J.D.; Schulze, Martin; Sheffield, R.L.; Smith, H. Vernon

doi:10.1109/pac.2001.987956

Cited by 13 publications

(13 citation statements)

References 7 publications

(11 reference statements)

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“…Halo formation is still not thoroughly understood or experimentally validated [19][20][21][22][23]. Most of the beam current is within the beam "envelope", but a small fraction of beam ions undergo radial excursions of up to a few envelope radii; these are known as halo ions, and are the most likely to be lost by scraping off on the beam tube.…”

Section: Issuementioning

confidence: 99%

Critical issues for high-brightness heavy-ion beams --prioritized

Molvik¹,

Cohen²,

Davidson³

et al. 2007

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SUMMARYThis study group was initiated to consider whether there were any "show-stopper" issues with accelerators for heavy-ion warm-dense matter (WDM) and heavy-ion inertial fusion energy (HIF), and to prioritize them. Showstopper issues would appear as limits to beam current; that is, the beam would be well-behaved below the current limit, and significantly degraded in current or emittance if the current limit were exceeded at some region of an accelerator. We identified 14 issues: 1-6 could be addressed in the near term, 7-10 are potentially attractive solutions to performance and cost issues but are not yet fully characterized, 11-12 involve multibeam effects that cannot be more than partially studied in near-term facilities, and 13-14 involve new issues that are present in some novel driver concepts. Comparing the issues with the new experimental, simulation, and theoretical tools that we have developed, it is apparent that our new capabilities provide an opportunity to re-examine and significantly increase our understanding of the number one issue -halo growth and mitigation.

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Section: Issuementioning

confidence: 99%

Critical issues for high-brightness heavy-ion beams --prioritized

Molvik¹,

Cohen²,

Davidson³

et al. 2007

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“…The objective is to make detailed comparisons [22,23] between predictions of haloformation models [24] and measured beam properties.…”

Section: Beam Halo Experimentsmentioning

confidence: 99%

“…As detailed in [22,23], first the matched beam condition is found, then the first four quadrupole magnets are adjusted to give either breathingmode or a quadrupole-mode mismatch conditions between µ = 0.65 and µ = 2. The beam profiles are then recorded at each of the nine HS/WS locations, one just after the RFQ, four mid-way down the halo channel, and four at the end of the halo channel.…”

Section: Beam-halo Measurementsmentioning

confidence: 99%

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Low-Energy Demonstration Accelerator (LEDA) test results and plans

Smith

Schneider

Sheffield

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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The LEDA 75-keV injector and 6.7-MeV RFQ have been tested with pulsed and cw proton beam currents up to 100 mA. Several LINAC2000 papers give the results of those measurements. A follow-on experiment, to intentionally introduce and measure beam halo on the RFQ output beam, is reported in several papers at this conference (PAC2001). In this paper we summarize the LEDA RFQ commissioning results and the beam-halo measurements and we discuss future test plans for this high-current, high-average-power rf structures test bed.

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“…Depending on how the magnets are adjusted, the development of specific types of halos has been documented [2]. These phase space halos manifest themselves as various shapes or "shoulders" on the projected beam distributions as measured by the WS/HS assemblies [3].…”

Section: Introductionsmentioning

confidence: 99%

Experience with the low energy demonstration accelerator (LEDA) halo experiment beam instrumentation

Gilpatrick

Barr²,

Colestock³

et al.

PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)

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A 52 quadrupole-magnet FODO lattice has been assembled and operated at the Los Alamos National Laboratory. The purpose of this lattice is to provide a platform to measure the resulting beam halo as the first four magnets of the lattice produce various mismatch conditions. These data are then compared with particle simulations so that halo formation mechanisms may be better understood. The lattice is appended to the LEDA 6.7-MeV radio frequency quadrupole (RFQ) and is followed by a short high-energy beam transport (HEBT) that safely dumps the beam into a 670-kW beam stop. Beam diagnostic instruments are interspersed within the lattice and HEBT. The primary instruments for measuring the beam halo are nine interceptive devices that acquire the beam's horizontal and vertical projected particle density distributions out to approximately 10 5 :1 dynamic range. These distributions are acquired using both traditional wire scanners and water-cooled graphite scraping devices. The lattice and HEBT instrumentation set also includes position, bunched-beam current, pulsed current, and beam loss measurements. This paper briefly describes and details the operation of each instrument, compares measured data from the different types of instruments, and refers to other detailed papers.

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Experimental study of proton-beam halo induced by beam mismatch in LEDA

Cited by 13 publications

References 7 publications

Critical issues for high-brightness heavy-ion beams --prioritized

Critical issues for high-brightness heavy-ion beams --prioritized

Low-Energy Demonstration Accelerator (LEDA) test results and plans

Experience with the low energy demonstration accelerator (LEDA) halo experiment beam instrumentation

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