RF Quadrupole Beam Dynamics

Stokes, R.H.; Crandall, K.R.; Stovall, J.; Swenson, D.A.

doi:10.1109/tns.1979.4330069

Cited by 38 publications

(4 citation statements)

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“…In the RFQ accelerator, the quadrupole focusing field is spatially continuous along the z-axis, in every period the quadrupole radius varies from a to ma (a is the radius, m > 1 is the radius modulation parameter) in both the x-z plane and y-z plane [8]. The structure of SFRFQ is somehow different from that of RFQ by a series of diaphragms loaded inside the quadrupole electrodes, so the radius of SFRFQ must be large enough to contain diaphragms [9].…”

Section: Beam Dynamics Study Of Sfrfqmentioning

confidence: 99%

Study of separated function radio frequency quadrupoles accelerator

Wang¹,

Chen²,

Lu³

et al. 2010

Chinese Phys. C

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SFRFQ (Separated Function Radio Frequency Quadrupoles) accelerator is a new post accelerator of RFQ (Radio Frequency Quadrupoles) type, which has been developed since the beginning of the 1990s at Peking University. In order to demonstrate the possibility of the SFRFQ, a prototype cavity has been designed. A special dynamics design method has been proposed to avoid the sparking problem and decrease the energy spread at the exit of SFRFQ. It consists of two aspects: the asymmetry structure design for transverse focusing and the inner buncher design for longitudinal bunching. This allows the improvement of the beam properties without increasing the cavity length. The simulation results show that the energy spread can be substantially reduced by using the inner buncher in the SFRFQ structure.

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Section: Beam Dynamics Study Of Sfrfqmentioning

confidence: 99%

Study of separated function radio frequency quadrupoles accelerator

Wang¹,

Chen²,

Lu³

et al. 2010

Chinese Phys. C

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“…Because of the simultaneous transverse focusing and longitudinal bunching in a cavity, a radio frequency quadrupole (RFQ) accelerator is considered to be the most suitable linear accelerator for the acceleration of low energy and high current beams [3,4]. However, a long RFQ cavity will decrease the efficiency of rf power.…”

Section: Introductionmentioning

confidence: 99%

Design of coupled cavity with energy modulated electron cyclotron resonance ion source for materials irradiation research

Wang

Chen

Kang

et al. 2012

Phys. Rev. ST Accel. Beams

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The surface topography of samples after irradiation with heavy ions, protons, and helium ions based on accelerators is an important issue in the study of materials irradiation. We have coupled the separated function radio frequency quadrupole (SFRFQ) electrodes and the traditional RFQ electrodes into a single cavity that can provide a 0.8 MeV helium beam for our materials irradiation project. The higher accelerating efficiency has been verified by the successful commissioning of the prototype SFRFQ cavity. An energy modulated electron cyclotron resonance (ECR) ion source can achieve a well-bunched beam by loading a sine wave voltage onto the extracted electrodes. Bunching is achieved without the need for an external bunch cavity, which can substantially reduce the cost of the system and the length of the beam line. The coupled RFQ-SFRFQ with an energy modulated ECR ion source will lead to a more compact accelerator system. The conceptual design of this novel structure is presented in this paper.

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“…A number of variations of the code were developed at various laboratories during the early years, but PARMTEQ was the standard with which the other codes were compared. PARMETQ used the two-term potential [2] to calculate the fields for the beam dynamics simulation. In the mid 1980s the code RFQTRAK was being developed at Chalk River [24], This code used higher order multipoles calculated by the code RFQCOEF [25] and used a 3D finite element method to calculate the effects of space charge and image charge.…”

Section: Rfq Beam Dynamics Codesmentioning

confidence: 99%

“…In 1979, R. ] gave this concept the name RFQ. Shortly after Valentine's Day in 1980 a telegram was sent to I. M. Kapchinskii.…”

mentioning

confidence: 99%