The injector for the HIDIF driver linac

Schempp, A.

doi:10.1016/s0168-9002(98)00386-6

Cited by 12 publications

(4 citation statements)

References 10 publications

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“…The HIDIF linac starts with 16 times 3 ion sources for three different ion species t o allow so-called "telescoping" at the final focus [5]. With four funneling stages the frequency has been increased from 12.5 MHz to 200 MHz accordingly [6]. For studies of the new two-beam RFQ structure and the rf-deflector, the first two-beam funneling experiments have been done with He + -ions at low energies to facilitate ion source operation and beam diagnostics.…”

Section: Introductionmentioning

confidence: 99%

Funneling with the two-beam RFQ

Zimmermann

Bechtold²,

Schempp³

et al.

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

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By ion beam funneling the beam current can be multiplied without changing the emittance, which is proposed for new high current accelerator facilities like HIDIF or ESS. There the required beam current can not be produced by a single pass rf-linac. The increase in brightness in such a driver linac is done by several funneling stages at low energies, in which two identically funneling studies, are not necessary [1,2,3]. A short r.f. funneling deflector is placed at the beam crossing position behind the RFQ. The HIDIF linac starts with 16 times 3 ion sources for three different ion species to allow socalled "telescoping" at the final focus [5]. With four funneling stages the frequency has been increased from 12.5 MHz to 200 MHz accordingly [6]. bunched-ion beams are combined into a single beam with twice the frequency, current and brightness.Our funneling experiment is a setup of two ion sources, a two beam RFQ, a funnel deflector and beam diagnostic equipment to demonstrate funneling of ion beams as a model for the first hneling stage of a HIIF driver. The progress of the funneling experiment and results of simulations will be presented.

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Section: Introductionmentioning

confidence: 99%

Funneling with the two-beam RFQ

Zimmermann

Bechtold²,

Schempp³

et al.

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

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“…A multibeam four-rod RFQ linac was proposed at Goethe University [3,4]. A two-beam linac as a prototype of the multibeam four-rod RFQ linac was developed, and beam transport experiments were performed.…”

Section: Introductionmentioning

confidence: 99%

Two-beam interdigital-H-type radio frequency quadrupole linac with direct plasma injection for high intensity heavy ion acceleration

Ishibashi

Hayashizaki

Hattori

2011

Phys. Rev. ST Accel. Beams

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We developed a two-beam interdigital-H-type radio frequency quadrupole (IH-RFQ) linac as a prototype of a multibeam IH-RFQ for high intensity heavy ion acceleration in the low energy region. This linac has two sets of RFQ electrodes within an IH-type resonant frequency cavity that is a powerefficient structure for low energy beam acceleration. The linac can accelerate two beams in parallel in one cavity with a reduction in the coulomb repulsive force (the space charge effect) between the accelerated heavy ion particles. The resonance frequency and the Q factor of the linac were found to be 47 MHz and 5900, respectively. We also developed a two-beam laser ion source with a direct plasma injection scheme as an injection system for the two-beam IH-RFQ linac and built a system to demonstrate the use of the two-beam IH-RFQ linac. Using this linac system, we were able to accelerate carbon ions from 5 to 60 keV=u and generate an output beam current of about 108 mA (2 Â 54 mA=channel). A coherency between the two beams, derived from the imbalance of the beam loading, was observed in the acceleration test with carbon ions.

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“…Multiturn injection is common in high-energy synchrotron and storage rings. In the rf accelerator approach to heavy ion fusion (HIF) [1], the required beam current cannot be produced from a single ion source. After the multiple beam ion injector the beam current is increased by funneling (i.e., longitudinal merging) pairs of beams into a single accelerator beam line [2 -4] with a corresponding doubling of rf frequency.…”

Section: Introductionmentioning

confidence: 99%

Scaled beam merging experiment for heavy ion inertial fusion

Seidl

Celata

Faltens

et al. 2003

Phys. Rev. ST Accel. Beams

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Transverse beam combining is a cost-saving option employed in many designs for heavy ion fusion drivers. However, the resultant transverse phase space dilution must be minimized so as not to sacrifice focusability at the target. A prototype combining experiment has been completed employing four 3-mA Cs beams injected at 160 keV. The focusing elements upstream of the merge consist of four quadrupoles and a final combined-function element (quadrupole and dipole). Following the merge, the resultant single beam is transported in a single alternating gradient channel where the subsequent evolution of the distribution function is diagnosed. The results are in fair agreement with particle-incell simulations. They indicate that for some heavy ion fusion driver designs, the phase space dilution from merging is acceptable.

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The injector for the HIDIF driver linac

Cited by 12 publications

References 10 publications

Funneling with the two-beam RFQ

Funneling with the two-beam RFQ

Two-beam interdigital-H-type radio frequency quadrupole linac with direct plasma injection for high intensity heavy ion acceleration

Scaled beam merging experiment for heavy ion inertial fusion

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