2D-3D PIC Code Benchmarking/Anchoring Comparisons For a Novel RFQ/RFI LINAC Design (original) (raw)

3D Electromagnetic/PIC Simulations for a Novel RFQ/RFI Linac Design

2019

Using the commercial software VSim 9, a highly parallelized particle-in-cell/finite difference time-domain modeling code, the performance of an existing novel RFQ/RFI linac structure designed by Ion Linac Systems is evaluated. This effort is aimed towards having an up to date full 3D start-to-end simulation of the accelerator system, which does not exist currently. The structure used is an efficient 200-MHz, 2.5-MeV, CW-RFQ/RFI proton linac. The methods employed in VSim for modelling and parameter setup are presented, along with the simulation procedures for both the Electromagnetic and PIC solver. The important figures of merit for the structure are given including the Q-factor, field distributions, shunt impedance, and important beam properties. These are then contrasted with the initial design values and analytical calculations.

Particle-In-Cell Simulation of RFQ in SSC - Linac

A 52MHz Radio Frequency Quadrupole (RFQ) linear accelerator (linac) is designed to serve as an initial structure for the SSC-linac system (injector into Separated Sector Cyclotron). The designed injection and output energy are 3.5 keV/u and 143 keV/u, respectively. Beam dynamics study in RFQ was done using 3-dimensional particle-in-cell code BEAMPATH [1]. Simulation results show that this RFQ structure is characterized by stable value of beam transmission efficiency (at least 95%) for both zero-current mode and for space charge dominated regime. The beam accelerated in RFQ has good quality in both transversal and longitudinal directions, and could be easily accepted by Drift Tube Linac (DTL). Effects of vane errors and of the space charge on beam parameters are studied as well to define the engineering tolerance for RFQ vane machining and alignment. Comment: 7 pages, 6 figures

A Particle-in-cell scheme of the RFQ in the SSC-Linac

2010

A 52 MHz Radio Frequency Quadrupole (RFQ) linear accelerator (linac) is designed to serve as an initial structure for the SSC-Linac system (injector into Separated Sector Cyclotron). The designed injection and output energy are 3.5 keV/u and 143 keV/u, respectively. The beam dynamics in this RFQ have been studied using a three-dimensional Particle-In-Cell (PIC) code BEAMPATH. Simulation results show that this RFQ structure is characterized by stable values of beam transmission efficiency (at least 95%) for both zerocurrent mode and the space charge dominated regime. The beam accelerated in the RFQ has good quality in both transverse and longitudinal directions, and could easily be accepted by Drift Tube Linac (DTL). The effect of the vane error and that of the space charge on the beam parameters have been studied as well to define the engineering tolerance for RFQ vane machining and alignment.

Benchmarking Linac Codes for the HIPPI Project

2005

In the framework of the HIPPI project a 3D linac code comparison and benchmarking program have been initiated. Particular attention is devoted to the validation of the space charge solvers, comparing the calculated electric field of a common initial distribution with a semi-analytical solution. In order to study the effects of numerical noise on the single particle dynamics, also the calculated single particle tune is compared with an analytical prediction. Particle tracking is eventually compared using the lattice of UNILAC DTL section, in preparation of validation with experimental emittance measurements to be carried out in the next two years.

Design of the CPHS RFQ Linac at Tsinghua University

Proceedings of …, 2010

The design progress of the Radio Frequency Quadrupole (RFQ) accelerator for the Compact Pulsed Hadron Source (CPHS) at Tsinghua University is presented in this paper. The RFQ will accelerate protons from 50 keV to 3 MeV, with the RF frequency of 325 MHz. The objective is to obtain the optimum structure of the RFQ accelerator with high transmission rate and tolerable total length. The beam dynamics are studied by the simulation of the proton beam in the RFQ accelerator with the code of PARMTEQM. The output proton beam from the RFQ is well matched into the DTL without Medium-Energy-Beam-Transport (MEBT) between the RFQ and DTL.

Beam Dynamics Simulations and Code Comparison for a New CW RFQ Design

2016

Research and development of CW applications is an important step in RFQ design. The RF potential should be limited by 1.3-1.5 of Kilpatrick criterion for the CW mode. A 2 MeV RFQ is under development for the compact CW research proton accelerator, as well as for planned driver linac in Russia. The maximum beam current is fixed to 10 mA; the operating frequency has been set to 162 MHz. The new RFQ linac design will be presented and beam dynamics simulation results will be discussed. Calculations of the beam dynamics are provided using the codes BEAMDULAC (developed at MEPhI for linac design) and DYNAMION. A comparison of the software performance is presented.

PTCC: New Beam Dynamics Design Code for Linear Accelerators

A fast and accurate beam dynamics design code, named PTCC (Particle Tracking Code in C) is developed to simulate particles dynamic in linear accelerators. PTCC solves the relativistic equations of motion for the macro-particles when subjected to electromagnetic fields excited in RF cavities. The self-fields of the particles are also part of the electromagnetic fields through which the particles are tracked. Self-fields are calculated using a modified 2D cylindrically symmetric mesh based method, making use of beam and field symmetry to provide fast simulation. The code has been benchmarked with the well known code ASTRA which is used mainly in simulations of next generation FEL linacs. PTCC provides a new tool for designing buncher section of linear accelerators that convert DC beam into bunches. New buncher design tool and benchmark results of PTCC with ASTRA are presented.

The design of a four-rod RFQ LINAC for VEC-RIB facility

Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment, 2004

A Radio Frequency Quadrupole (RFQ) linac has been designed for the Radioactive Ion Beam (RIB) facility being built at the Variable Energy Cyclotron Centre (VECC), Kolkata, India. Low-energy RIBs of 1.0 keV/u and q/A X1/16 will be accelerated to about 86 keV/u in a 35 MHz, 3.2 m long structure. A half-scale model of the RFQ has been fabricated and cold-model RF-tests confirm the design parameters. The beam dynamics and RF-structure design of the RFQ along with the results of the cold model tests are presented. r 2004 Elsevier B.V. All rights reserved.

Performance of the CERN Linac 2 with a high intensity proton RFQ

1994

operating experience of Linac 2 with its new injector is also described. linac and how they compare with beam dynamics simulations. The first Linac 2, the measurements of beam intensity and quality at the output of the simulations and measurements to determine the new parameter set-up for This paper covers the RFQ2 installation and running-in at the linac, the Large Hadron Collider.

Simulations of Ion Beam Loss in RF Linacs with Emphasis on Tails of Particle Distributions

Submitted for …, 2008

We present a new approach for beam loss calculations that places emphasis on the tails of the particle distributions. This scheme is used for simulating the SARAF proton/deuteron accelerator, a 176 MHz RF linac complex consisting of a 4-rod RFQ and 44 SC half wave resonator (HWR) cavities designed to operate in CW mode at 4 mA beam current. We discuss our scheme for highlighting the tails of the particle bunches generated by the RFQ. Simulation of the RFQ and RF linac with the tail emphasis technique allows ...