Combined zero degree structure beam dynamics and applications

Ratzinger, U.; Hähnel, Hendrik; Tiede, R.; Kaiser, Jan Dominik; Almomani, Ali

doi:10.1103/physrevaccelbeams.22.114801

Cited by 17 publications

(12 citation statements)

References 14 publications

(25 reference statements)

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“…While the current application requires only 1 MV of accelerating voltage, the proposed structure can be reliably operated at higher voltages and accelerating gradients since the peak surface fields are low. The shunt impedance of Htype accelerating structures varies roughly as β −2 [3,8,10] making them especially efficient for low velocities and applicable in lieu of SC structures. In practice, the choice of either H-type room temperature or superconducting structures for acceleration of cw ion beams below ∼20 MeV=u depends on many aspects specific to a particular research laboratory like available infrastructure, real-estate space and staff expertise, cost of rf system, availability of vendors, etc.…”

Section: Discussionmentioning

confidence: 99%

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Efficient continuous wave accelerating structure for ion beams

Ostroumov

Plastun

Bultman

et al. 2020

Phys. Rev. Accel. Beams

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The Facility for Rare Isotope Beams driver linac was designed for acceleration of multiplecharge-state beams after the stripping at ion beam energies of 17 to 20 MeV=u depending on the ion species. The linac includes a 180°achromatic bend to select multiple charge states for further acceleration and to dump unwanted charge states after the first 45°magnet. Two rf rebunchers between the stripper and the linac segment 2 (LS2) are required to minimize the effective emittance growth of the multiple-charge-state beams and provide matching to the LS2. Recent studies have shown that the best choice for these two rebunchers is a room-temperature (RT) accelerating structure capable of providing robust operation in the presence of the stripped heavy ion beam contaminants. The latter can result in uncontrolled losses of contaminant ions after the passage off the stripper. Therefore, using a superconducting (SC) rebuncher after the stripper is not rational due to possible contamination and performance degradation of SC cavities over a long period of operation. For the beam bunching in the energy range from 13 to 22 MeV=u, two 161 MHz rebunchers based on interdigital H-type (IH) structure were developed, built, installed and commissioned with beam at the FRIB linac. This is the first experimental demonstration for application of a cw RT drift tube accelerating structure in this energy range.

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Section: Discussionmentioning

confidence: 99%

“…There are several operational pulsed linacs based on IH structures up to energies of 6 MeV=u. Recently, there were developments to apply IH structures and crossbar H-type (CH) structures for acceleration of protons up to 100 MeV in a pulsed mode [8,9].…”

Section: Multiphysics Design Of the Accelerating Structurementioning

confidence: 99%

Efficient continuous wave accelerating structure for ion beams

Ostroumov

Plastun

Bultman

et al. 2020

Phys. Rev. Accel. Beams

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“…After passing through several periods of alternating phases, the beam is accelerated while maintaining a reasonable emittance growth. In contrast, other beam dynamics schemes [8] usually employ a synchronous phase around −30 • to bunch the beam, and the transverse focusing of the beam is achieved by the magnets installed inside the cavity. For instance, in the Alvarez type DTL, magnets are installed in DTs [9,10], which greatly increases the size and weight of the DTs and stems.…”

Section: Alternating Phase Focusingmentioning

confidence: 99%

Beam dynamics and cavity design of an 8 MeV CW IH-DTL for SYSU-PAFA

Wang

et al. 2023

J. Inst.

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As a part of the Particle Accelerator Facility at Sun Yat-sen University (SYSU-PAFA), a 200 MHz drift tube linac (DTL), operating under continuous wave (CW) mode, has been designed. PAFA-DTL is expected to accelerate a 10 mA proton beam from 2.5 MeV to 8 MeV. Using the alternative phase focusing (APF) beam dynamics scheme, a compact cell array has been designed and optimized in order to limit the cavity length to 2.4 m with high acceleration efficiency. As a result, PAFA-DTL contains 31 acceleration cells with beam transmission efficiency reaches 100%, and better output beam quality is obtained by optimizing the input beam parameters. Interdigital H-mode (IH) structure is utilized in the PAFA-DTL cavity, which has achieved a high unloaded quality factor of 13987. Additionally, to ensure the stability of PAFA-DTL under CW operation, a low Kilpatrick factor (Kp) of 1.42 is obtained by adjusting the blending radius of the drift tubes (DTs) to reduce the risk of RF breakdown. The gap voltage distribution through RF design is compared with that from the beam dynamics, and the maximum absolute value of deviation is only 0.73%. In this paper, the detailed design and results of PAFA-DTL, including beam dynamics and RF design, are presented.

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“…The cavity is designed to provide an acceleration of 2.4 MeV, which would equate to an average acceleration gradient of 6.8 MeV/m. A total of six accelerating gaps is modeled after a KONUS zero degree section [1]. The beam dynamics are shown in Fig.…”

Section: Beam Dynamics Test Casementioning

confidence: 99%

First 3D Printed IH-Type Linac Structure—Proof-of-Concept for Additive Manufacturing of Linac RF Cavities

Hähnel

Ratzinger

2022

Instruments

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Additive manufacturing (AM or “3D printing”) has become a powerful tool for the rapid prototyping and manufacturing of complex part geometries. Especially interesting for the world of particle accelerators is the process of the 3D printing of stainless steel (and copper) parts. We present a first prototype of a 43 MHz IH-type linac cavity with an internal drift tube structure manufactured by metal 3D printing. The prototype cavity has been constructed to act as a proof-of-concept for the technology. In this paper we present the concept of the cavity as well as first results of vacuum testing and materials testing.

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Combined zero degree structure beam dynamics and applications

Cited by 17 publications

References 14 publications

Efficient continuous wave accelerating structure for ion beams

Efficient continuous wave accelerating structure for ion beams

Beam dynamics and cavity design of an 8 MeV CW IH-DTL for SYSU-PAFA

First 3D Printed IH-Type Linac Structure—Proof-of-Concept for Additive Manufacturing of Linac RF Cavities

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