Intrabeam stripping in H- Linacs

Lebedev, V. N.; Solyak, N.; Ostigy, J.-F.; Alexandrov, A.; Shishlo, A.

doi:10.48550/arxiv.1207.5492

Cited by 6 publications

(7 citation statements)

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“…The Booster Replacement Linac is also H − and is therefore vulnerable to this loss mechanism. An equation for the beam loss due to intra-beam stripping is presented in [16]:…”

Section: Intra-beam Scatteringmentioning

confidence: 99%

An 8 GeV linac as the Booster replacement in the Fermilab Power Upgrade

Neuffer¹,

S.²,

Johnson³

et al. 2023

J. Inst.

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Increasing the Main Injector beam power above ∼ 1.2 MW requires replacement of the 8 GeV Booster by a higher intensity alternative. In this paper, we consider an 8 GeV linac Booster replacement that produces 8 GeV H- beam for injection into the Recycler Ring or Main Injector. This upgrade will maximize the beam available for neutrino production for the long baseline DUNE experiment to greater than 2.5 MW and enable a next generation of intensity frontier experiments. The 8 GeV linac takes ∼ 1 GeV beam from the PIP-II Linac and accelerates it to ∼ 2 GeV in a 650 MHz superconducting RF linac, followed by a ∼ 2 to 8 GeV pulsed linac using 1300 MHz cryomodules. The linac components incorporate recent improvements in superconducting RF technology. The linac configuration and beam dynamics requirements are presented. Injection options are discussed, including use of an 8 GeV Accumulator Ring. Foil-based injection is the present standard but R&D toward implementing laser-assisted injection could enable a significant improvement. Research needed to implement the Booster replacement is described.

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“…The Booster Replacement Linac is also H − and is therefore vulnerable to this loss mechanism. An equation for the beam loss due to intra-beam stripping is presented in [16]:…”

Section: Intra-beam Scatteringmentioning

confidence: 99%

An 8 GeV linac as the Booster replacement in the Fermilab Power Upgrade

Neuffer¹,

S.²,

Johnson³

et al. 2023

J. Inst.

View full text Add to dashboard Cite

show abstract

“…Although a number of the works cited herein provide superior analysis, we found that a comprehensive review was lacking. For a more complete study, the reader is strongly recommended to consult these works in particular: [15], [19], [35].…”

Section: Discussionmentioning

confidence: 99%

“…and varies with weak dependence on its parameters from 1 to 1.15. (See [35] for a detailed treatment, or [36] for a discussion of the underlying physics.) Then, σ max IB is the maximum IBS cross-section (not to be confused with σ max BB from Eq.…”

Section: Intrabeam Strippingmentioning

confidence: 99%

“…Additional dependence on accelerating phase and RF frequency may also be inferred, either of which can be reduced to mitigate stripping. Relaxed transverse focusing also limits IBS; in this case, one can take the defocusing strength of cavities as a limiting parameter for a minimally focused beam [35].…”

Section: Intrabeam Strippingmentioning

confidence: 99%

“…We can also expand on this (and the discussion in [35]) in terms of phase advance and emittance. Phase advance φ has the proportionalities…”

Section: Design Recommendations a Optics Emittance And Phase Advancementioning

confidence: 99%

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Stripping Mechanisms and Remediation for H$^-$ Beams

Folsom,

Eshraqi,

Kraljevic

et al. 2021

Preprint

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Negative hydrogen ions, or H − , are often used for accumulating protons in storage rings via chargeexchange injection. In this process, its two electrons are stripped by a foil or laser to produce protons which can be merged with an existing beam without significantly affecting its dynamics, allowing high intensities of protons to be accumulated. However, this capability comes with the drawback that the outer electron of an H − ion has a low binding energy and can easily be stripped away prior to injection. This paper addresses the following stripping mechanisms: interactions with residual gas in the beam pipe, blackbody radiation from accelerator components, and electromagnetic fields from accelerator optics (Lorentz-force stripping) and particles within the bunch itself (intrabeam stripping); with a discussion on how to avoid excessive activation from stripped H 0 particles and protons. In addition, particle tracking simulations are used to demonstrate that the proportion of stripped H 0 particles which traverse to the end of a linac or local straight section, presents a significant fraction of the lost power from the beam (compared with the more problematic H 0 colliding with the beam pipe or machine-element walls); this may relax the limits for allowable stripping-based beam loss in H − accelerators.

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Multi-beam operation of LANSCE accelerator facility

Batygin

2024

J. Inst.

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The Los Alamos Neutron Science Center (LANSCE) accelerator facility has been in operation for 50 years performing important scientific support for national security. The unique feature of the LANSCE accelerator facility is multi-beam operation, delivering beams to five experimental areas. The near-term plans are to replace obsolete and almost end-of-life systems of the LANSCE linear accelerator with a modern 100-MeV Front End with significant improvement in beam quality. This paper summarizes experimental results obtained during the operation of the LANSCE accelerator facility and considers plans to expand the performance of the accelerator for near- and long-term operations.

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Intrabeam stripping in H- Linacs

Cited by 6 publications

References 0 publications

An 8 GeV linac as the Booster replacement in the Fermilab Power Upgrade

An 8 GeV linac as the Booster replacement in the Fermilab Power Upgrade

Stripping Mechanisms and Remediation for H$^-$ Beams

Multi-beam operation of LANSCE accelerator facility

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