A feasibility study of space-charge neutralized ion induction linacs: Final report

Slutz, Stephen A.; Primm, P.; Renk, T. J.; Johnson, D. J.

doi:10.2172/456328

Cited by 2 publications

(3 citation statements)

References 2 publications

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“…Neutralizing a beam has been shown to be difficult without increasing the emittance [25]]. Aperturing over a 2 m length of 10 ESQs should provide halo-free operation for a comparable distance in magnetic quads, if the long drift plus the change in lattice period in the magnetic quads does not regenerate significant halo [26].…”

Section: Issuementioning

confidence: 99%

“…c. These experiments would also benefit from longer duration ion beams, to provide more time for desorbed gas to reach the beam. For this purpose, consider using STS-500 pulser: can we achieve operation at 500 kV for [18][19][20][21][22][23][24][25][26][27][28][29][30] µs with a modified existing facility? Can we vary duration to check the scaling with time of gas-induced beam loss?…”

Section: Issue: Reduce Gas-induced Beam Loss and Degradation To Neglimentioning

confidence: 99%

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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%

Section: Issue: Reduce Gas-induced Beam Loss and Degradation To Neglimentioning

confidence: 99%

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

Molvik¹,

Cohen²,

Davidson³

et al. 2007

View full text Add to dashboard Cite

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“…At present, several methods of obtaining highcurrent ion beam, which are based on the use of induction accelerators and are applied to inertial controlled fusion (ICF) research, are being considered [1][2][3]. To date, kiloampere ion beams with energies of several hundred keV have been produced in highcurrent linear induction accelerators (linac) with collective focusing [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Charge compensation and acceleration of a thick-walled high-current ion beam in induction linac

Belova

Karas

Shulika

12th International Conference on High-Power Particle Beams. BEAMS'98. Proceedings (Cat. No.98EX103)

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INTRODUCTIONAt present, several methods of obtaining highcurrent ion beam, which are based on the use of induction accelerators and are applied to inertial controlled fusion (ICF) research, are being considered [1][2][3]. To date, kiloampere ion beams with energies of several hundred keV have been produced in highcurrent linear induction accelerators (linac) with collective focusing [4][5][6]. The power of the hollow highcurrent ion beam (HHCIB) for ICF purposes must be several orders greater, with rather stringent requirements on beam brightness. Therefore, when developing a driver for ICF on the basis of a highcurrent linac, it is necessary to investigate a number of important physical problems: (1) the formation of highcurrent beams in injector; (2) the provision of efficient magnetic insulation for accelerating gaps; (3) charge compensation of the ion beam in the transport channel and in the magneto-insulated accelerating gaps; (4) effective acceleration and stability of the ion beam in accelerating channel; and (5) transport, focusing, and space-time compression of HHCIBs.In linac, the conventional way of charge and current compensation [7,8] is inefficient. In [9, 10], a new mechanism for the neutralization of HHCIBs in axially symmetric magneto-insulated gaps was proposed. Its physical meaning is that a specially injected compensating electron beam drifts through the cusp due to self-consistent azimuthal magnetic field and an electric field caused by a small radial separation of ion and electron beams.In [11][12][13], the investigation results of the acceleration, and the charge and current compensation of HHCIBs in one and two linac cusps are reported. These results have shown that both in the presence and in the absence of an accelerating electric field, the following effects take place: (1) charge and current compensation of HHCIB in the accelerating gaps; (2) stability of the ion beam during times that substantially exceed the inverse ion Langmuir and Larmor frequencies. The performed numerical simulations have also shown that in the drift space between two accelerating gaps the current and charge compensation of the ion beam proved to be insufficient because of a substantial difference in the electron and ion velocities acquired up to the time of the transit of the beams through the drift gap. As a result, the positive potential of the self-consistent field in the drift space leads to the spread and deceleration of the ion beam and, consequently, to the degradation of the beam brightness. The positive space charge in the drift gap can be compensated by injecting thermal electrons into it. It was shown that a preliminary injection of cold electrons permits to eliminate broadening and decelerating an ion beam in the drift gap and to provide its additional focusing.

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A feasibility study of space-charge neutralized ion induction linacs: Final report

Cited by 2 publications

References 2 publications

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

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

Charge compensation and acceleration of a thick-walled high-current ion beam in induction linac

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