Efficient accelerating structures for low-energy light IONS

Kurennoy, Sergey S.; Rybarcyk, L.; Wangler, T.P.

doi:10.1109/pac.2007.4439921

Cited by 4 publications

(10 citation statements)

References 5 publications

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“…At the high-energy end of our deuteron linac, at 0.065 β = , the differences in efficiency and size between H-structures and DTL become somewhat smaller but still are very significant, see [10] for details. One should mention that the accelerating structures presented in Tab.…”

Section: H-mode Accelerating Structures H-mode Structures Versus Dtlmentioning

confidence: 99%

“…The venerable LANSCE DTL has been in service for $40 years. In view of recent plans to upgrade the linac front end [33], we have explored [34] a potential option of replacing the aging DTL (or some parts of it) by more efficient H-PMQ accelerating structures. The LANSCE DTL consists of four DTL tanks; the parameters of the first three tanks are listed in Table VII [13].…”

Section: Ch-pmq Linac As a Dtl Replacementmentioning

confidence: 99%

“…The IH-PMQ structures for the tank 1 replacement are similar to those discussed in Secs. II, III, and IV for deuterons, except for the different velocity profile for protons; see [34] for details. From all CH structures required to replace the DTL tanks 2-4, we will present only two examples: one tank from 5.4 MeV (beginning of tank 2) and the other from 20 MeV (its middle).…”

Section: Ch-pmq Linac As a Dtl Replacementmentioning

confidence: 99%

“…We proposed [10] inserting permanent-magnet quadrupoles inside the small DT of the H-cavities; such structures can be called H-PMQ. This approach provides the transverse beam focusing in H-mode structures without any reduction of their accelerating efficiency.…”

Section: Introductionmentioning

confidence: 99%

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H-mode accelerating structures with permanent-magnet quadrupole beam focusing

Kurennoy

Rybarcyk

O’Hara

et al. 2012

Phys. Rev. ST Accel. Beams

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We have developed high-efficiency normal-conducting rf accelerating structures by combining H-mode resonator cavities and a transverse beam focusing by permanent-magnet quadrupoles (PMQ), for beam velocities in the range of a few percent of the speed of light. The shunt impedance of interdigital H-mode (IH-PMQ) structures is 10-20 times higher than that of a conventional drift-tube linac, while the transverse size is 4-5 times smaller. Results of the combined 3D modeling-electromagnetic computations, multiparticle beam-dynamics simulations with high currents, and thermal-stress analysis-for an IH-PMQ accelerator tank are presented. The accelerating-field profile in the tank is tuned to provide the best propagation of a 50-mA deuteron beam using coupled iterations of electromagnetic and beamdynamics modeling. Measurements of a cold model of the IH-PMQ tank show a good agreement with the calculations. Examples of cross-bar H-mode structures with PMQ focusing for higher beam velocities are also presented. H-PMQ accelerating structures following a short radio-frequency quadrupole accelerator can be used both in the front end of ion linacs or in stand-alone applications.

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Section: H-mode Accelerating Structures H-mode Structures Versus Dtlmentioning

confidence: 99%

Section: Ch-pmq Linac As a Dtl Replacementmentioning

confidence: 99%

Section: Ch-pmq Linac As a Dtl Replacementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

H-mode accelerating structures with permanent-magnet quadrupole beam focusing

Kurennoy

Rybarcyk

O’Hara

et al. 2012

Phys. Rev. ST Accel. Beams

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“…Moreover, if this short 1.8-m RFQ were connected to a short 1.3-m drift tube linac (DTL), a beam of 4-MeV deuterons could be obtained in a much shorter length than an equivalent single RFQ, which would be roughly 8 m long. This combination also consumes less than 90 kW of rf power because of the high accelerating gradient of the DTL [8]. Thus, it would be a very efficient injector for compact neutron sources.…”

Section: Introductionmentioning

confidence: 99%

Design and cold model experiment of a continuous-wave deuteron radio-frequency quadrupole

Easton

et al. 2017

Phys. Rev. Accel. Beams

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A deuteron radio-frequency quadrupole (RFQ) is being built by the RFQ group at Peking University. It is a very compact high-current RFQ, operating at 162.5 MHz in continuous-wave mode. By optimizing the beam dynamics design, our simulations reached 98% transmission efficiency for acceleration of the 50-mA deuteron beam from 50 keV to 1 MeV, with an intervane voltage of 60 kV and a length of 1.809 m. This RFQ adopts a window-type structure, with low power consumption and sufficient mode separation, with no stabilizing rods required. Its magnetic coupling windows have been optimized by both electromagnetic simulation and the construction of an equivalent circuit model. The empirical equation based on the circuit model provides a new way to evaluate the effect of the window size on the frequency. In addition, an aluminum model of the full-length RFQ has been built and tested, and the results show good agreement with the simulations. During the tuning process, the magnetic coupling effect between quadrants was found to be unique to the window-type RFQ. We also propose a method to estimate the effects of different degrees of electric field unflatness on the beam transmission. For the cooling system design, the results of thermostructural analysis, verified by comparing results from ANSYS and CST, show that the special cooling channels provide a high cooling efficiency around the magnetic coupling windows. The maximal deformation of the structure was approximately 75 μm. The beam-loading effect caused by a high current, and the coupler design, are also discussed.

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Novel Linac Structures For Low-Beta Ions And For Muons

Kurennoy¹

2011

AIP Conference Proceedings

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Development of two innovative linacs will be discussed. I. High-efficiency normal-conducting accelerating structures for ions with beam velocities in the range of a few percent of the speed of light. Two existing accelerator technologies-the H-mode resonator cavities and transverse beam focusing by permanent-magnet quadrupoles (PMQ)-are merged to create efficient and practical structures for light-ion beams of considerable currents. The inter-digital H-mode accelerator with PMQ focusing (IH-PMQ) has the shunt impedance 10-20 times higher than the standard drift-tube linac. Results of the combined 3-D modeling for an IH-PMQ accelerator tank-electromagnetic computations, beam-dynamics simulations, and thermal-stress analysis-will be presented. H-PMQ structures following a short RFQ accelerator can be used in the front end of ion linacs or in stand-alone applications like a compact mobile deuteron-beam accelerator up to a few MeV. 2. A large-acceptance high-gradient linac for accelerating low-energy muons in a strong solenoidal magnetic field. When a proton beam hits a target, many low-energy pions are produced almost isotropically, in addition to a small number of high-energy pions in the forward direction. We propose to collect and accelerate copious muons created as the low-energy pions decay. The acceleration should bring muons to a kinetic energy of ~200 Me V in about 10m, where both an ionization cooling of the muon beam and its further acceleration in a superconducting linac become feasible. One potential solution is a normal-conducting linac consisting of independently fed O-mode RF cavities with wide apertures closed by thin metal windows or grids. The guiding magnetic field is provided by external superconducting solenoids. The cavity choice, overalliinac design considerations, and simulation results of muon acceleration will be presented. Potential applications range from basic research to homeland defense to industry and medicine.

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Efficient accelerating structures for low-energy light IONS

Cited by 4 publications

References 5 publications

H-mode accelerating structures with permanent-magnet quadrupole beam focusing

H-mode accelerating structures with permanent-magnet quadrupole beam focusing

Design and cold model experiment of a continuous-wave deuteron radio-frequency quadrupole

Novel Linac Structures For Low-Beta Ions And For Muons

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