Optimization of a Radial Matching Section

Ovsyannikov, Alexander; Ovsyannikov, Dmitri; Chung, Sheng‐Luen

doi:10.1142/s0217751x09044413

Cited by 11 publications

(4 citation statements)

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“…In addition, a possible optimization procedure of dynamics in the RFQ for a mismatched beam is described in ref. (Ovsyannikov, Ovsyannikov and Chung, 2009a), and in ref. (Ovsyannikov et al, 2016), this procedure was generalized for separate acceleration of two beams.…”

Section: Velocities Of the Ions Of Different Types Injectedmentioning

confidence: 85%

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Preacceleration of the multicharged ions with the different A/Z ratios in single RFQ channel

Altsybeyev

Svistunov

Durkin

et al. 2018

CAP

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The preacceleration of multicharged ions with the different A/Z ratios extracted from electron cyclotron resonance (ECR) sources is discussed in this report. The capture ratio, emittances and current values of multicharged ions may be better if the ions are preaccelerated before their injection into a booster synchrotron. There is a considerable possibility of separate preacceleration of multicharged ions with different A/Z ratios in a single radio-frequency quadrupole (RFQ) channel. The magnitude of the injection energy into RFQ is about a few keV/u whereas the magnitudes of the injection energy into booster or following linac cascade are 300 keV/u. In addition in this paper we discuss the approach of the fast channel parameter optimization technique by using swarm computations and gradient descend for improving the capture ratio. The optimizations aimed at changing the regular part of the RFQ or matching section profile to improve the matching of the arbitrary oriented in phase space input beam.

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Section: Velocities Of the Ions Of Different Types Injectedmentioning

confidence: 85%

“…For dynamics modeling of the RFQ, the DAISI uses the standard model with a standing-wave approximation (Ovsyannikov et al, 2014;Ovsyannikov et al, 2009a;Ovsyannikov, Ovsyannikov, Vorogushin, Svistunov and Durkin, 2006;Ovsyannikov, Ovsyannikov, Antropov and Kozynchenko, 2005)…”

Section: Rfq Optimization and Beam Dynamics Simulations 21 Main Ideamentioning

confidence: 99%

Preacceleration of the multicharged ions with the different A/Z ratios in single RFQ channel

Altsybeyev

Svistunov

Durkin

et al. 2018

CAP

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“…3. Matching section for case acceleration of two types particles must be optimized by methods described in papers [Ovsyannikov et al, 2009;Ovsyannikov et al, 2016;Altsybeyev et al, 2018]. Examples of modeling dynamics of ions H ± and D ± in single accelerating RFQ structure for different currents are given in [Ovsyannikov et al, 2016].…”

Section: Introductionmentioning

confidence: 99%

Choice of accelerator type for Boron Neutron Capture Therapy system

Svistunov

Ovsyannikov

Edamenko

2019

CAP

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There are briefly considered physical and medical aspects contemporary development of Boron Neutron Capture Therapy (BNCT) system. Choice of accelerator for neutron produce is discussed. Three of accelerator types are compared: electrostatic accelerator, compact cyclotron and RFQ with working frequency of P-diapason. A few factors determine choice: providing required neutron flux, compactness of accelerator and whole BNCT system, economical power consumption. Our choice is radio-frequency quadrupole. Two of RFQ variants are considered: compact RFQ and universal one, which has possibility to accelerate two of types particles (proton and deuteron) and to use two of types targets (Lithium and Beryllium) for neutron production.

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“…There are many methods and codes to design a RFQ channel. Below we show how mathematical optimization methods can be used in the practical design of a RFQ accelerator [1], [2], [3], [4].…”

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confidence: 99%

Optimization of beam parameters in RFQ channel

Ovsyannikov

Altsybeyev

et al. 2014

2014 20th International Workshop on Beam Dynamics and Optimization (BDO)

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Associated codes the BDO-RFQ and the LIDOS RFQ for optimization parameters of RFQ channel are used. As an example, beam dynamics simulation results for 47.2 MHz RFQ accelerator are discussed.RFQ accelerator is used as the initial part of large linacs for industrial and medical purposes. There are many methods and codes to design a RFQ channel. Below we show how mathematical optimization methods can be used in the practical design of a RFQ accelerator [1], [2], [3], [4].Accelerating and focusing processes in RFQ accelerators are controlled by the smooth changing of the four parameters: vane modulation, intervane voltage, synchronous phase and aperture. These parameters define the length of the modulation period.At the same time today we have a well-developed mathematical theory of the multiparameter optimization which can be applied to beam dynamics and plasma problems and formally give us a possibility to optimize any accelerating or focusing channel [5].To create directional optimization methods based on the analytical approaches we use the following mathematical modelHere W n and W are the initial and the current beam energy, ω = 2π/λ is the RF-field frequency; k = 2π/l; L is the acceleration period length;; U is the intervane voltage, T is the acceleration efficiency, depending on the vane modulation and the ratio of the aperture to the acceleration period length; η = U T (U T )max ; the maximum value (U T ) max is the initial data. The last term in the phase motion equation corresponds to a space charge field. Constraint (3) concerns the defocusing parameter, usually 0.01 ≤ A ≤ 0.02. Constraint (4) concerns with the monotonic decrease of the phase length rms value ∆ϕ. It is necessary for space charge dominated beam acceleration. So we need to find plots η(ζ) and ϕ(ζ) to provide bunching and acceleration of a beam. To solve this problem we need to introduce some functional [1, 2], describing the capture of an accelerated particles and other needed beam parameters at the output of the channel. Constraints (3), (4) are included also.Optimization of the longitudinal motion of particles was carried out using the BDO-RFQ code developed at the SaintPetersburg State University [7]. As a result of the optimization the functions η(ζ) and ϕ(ζ) have been identified, providing desired characteristics of the output beam.After optimization of the phase motion, given the specified intensity values E = U/R 0 and focusing parameter Q = U/R 2 0 , the average aperture radius R 0 and the intervane voltage can be determined, then the efficiency T is determined, which unambiguously corresponds to the modulation of the electrodes m. The correspondence between the variable ζ and the cell number n is set by n = ζ/κ where κ = Ω/ω. Thus all the necessary dependencies are defined U (n), m(n), R 0 (n), ϕ s (n) for the initial approximation.The proposed technique is implemented in the BDO-RFQ code. The initial data array [U (n), m(n), R 0 (n), ϕ s (n)], obtained on the basis of the found optimized laws and then used to convert them into t...

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Optimization of a Radial Matching Section

Cited by 11 publications

References 1 publication

Preacceleration of the multicharged ions with the different A/Z ratios in single RFQ channel

Preacceleration of the multicharged ions with the different A/Z ratios in single RFQ channel

Choice of accelerator type for Boron Neutron Capture Therapy system

Optimization of beam parameters in RFQ channel

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