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Jolly, S.

Paper Title Page
MOPEC076 Integrated Design Method and Beam Dynamics Simulations for the FETS Radio Frequency Quadrupole 645
 
  • S. Jolly, M.J. Easton
    Imperial College of Science and Technology, Department of Physics, London
  • A.P. Letchford
    STFC/RAL/ISIS, Chilton, Didcot, Oxon
  • J.K. Pozimski
    STFC/RAL, Chilton, Didcot, Oxon
 
 

A 4m-long, 324MHz four-vane RFQ, consisting of four coupled sections, is currently being designed for the Front End Test Stand (FETS) at RAL in the UK. A novel design method, integrating the CAD and electromagnetic design of the RFQ with beam dynamics simulations, is being used to optimise the design of the RFQ. Basic RFQ parameters are produced with the RFQSIM code. A full CAD model of the RFQ vane tips is produced in Autodesk Inventor, based upon these parameters. This model is then imported into a field mapping code to produce a simulation of the electrostatic field around the vane tips. This field map is then used to model the beam dynamics within the RFQ using General Particle Tracer (GPT). Previous studies have been carried out using field mapping in CST EM Studio. A more advanced technique using Comsol Multiphysics and Matlab, that more tightly integrates the CAD modelling, field mapping and beam dynamics simulations, is described. Results using this new method are presented and compared to the previous optimisation process using field maps from CST.

 
MOPD056 The Mechanical Engineering Design of the FETS RFQ 810
 
  • P. Savage, S.M.H. Alsari, S. Jolly
    Imperial College of Science and Technology, Department of Physics, London
  • S.R. Lawrie, A.P. Letchford, P. Wise
    STFC/RAL/ISIS, Chilton, Didcot, Oxon
  • J.K. Pozimski
    STFC/RAL, Chilton, Didcot, Oxon
 
 

This paper will present the mechanical engineering design for a 324 MHz 4-vane RFQ, which has been developed for the Front End Test Stand (FETS) project based at the Rutherford Appleton Laboratory (RAL) in the UK. The design criteria will be discussed along with particular design features of the RFQ including the tuners, vacuum ports, main body cooling pocket design and the support / alignment structure. Different techniques for creating the RF and vacuum seal between major and minor vanes are also discussed.

 
MOPD060 Design Optimisation and Particle Tracking Simulations for PAMELA Injector RFQ 822
 
  • M.J. Easton, M. Aslaninejad, S. Jolly, J.K. Pozimski
    Imperial College of Science and Technology, Department of Physics, London
  • K.J. Peach
    JAI, Egham, Surrey
 
 

The PAMELA (Particle Accelerator for MEdicaL Applications) project aims to design an ns-FFAG accelerator for cancer therapy using protons and carbon ions. For the injection system for carbon ions, an RFQ is one option for the first stage of acceleration. Our integrated RFQ design process* has been developed further using Comsol Multiphysics for electric field modelling. The design parameters for the RFQ are automatically converted to a CAD model using Autodesk Inventor, and the electric field map for this model is simulated in Comsol. Particles can then be tracked through this field map using Pulsar Physics' General Particle Tracer (GPT). Our software uses Visual Basic for Applications and MATLAB to automate this process and allow for optimisation of the RFQ design parameters based on particle dynamical considerations. Possible designs for the PAMELA RFQ, including super-conducting and normal-conducting solutions, will be presented and discussed, together with results of the field map simulations and particle tracking for these designs.


* M J Easton et al., RFQ Design Optimisation for PAMELA Injector, PAC09, Vancouver, Canada, April 2009, FR5REP066.

 
MOPEC075 Status of the RAL Front End Test Stand 642
 
  • A.P. Letchford, M.A. Clarke-Gayther, D.C. Faircloth, S.R. Lawrie, M. Perkins, P. Wise
    STFC/RAL/ISIS, Chilton, Didcot, Oxon
  • S.M.H. Alsari, S. Jolly, D.A. Lee, P. Savage
    Imperial College of Science and Technology, Department of Physics, London
  • I. Ariz, R. Enparantza, P. Romano, A. Sedano
    Fundación TEKNIKER, Eibar (Gipuzkoa)
  • J.J. Back
    University of Warwick, Coventry
  • F.J. Bermejo
    Bilbao, Faculty of Science and Technology, Bilbao
  • M. Eguiraun
    ESS-Bilbao, Zamudio
  • V. Etxebarria
    University of the Basque Country, Faculty of Science and Technology, Bilbao
  • C. Gabor, D.C. Plostinar
    STFC/RAL/ASTeC, Chilton, Didcot, Oxon
  • N. Garmendia, H. Hassanzadegan
    ESS Bilbao, Bilbao
  • A. Kurup
    Fermilab, Batavia
  • J.K. Pozimski
    STFC/RAL, Chilton, Didcot, Oxon
 
 

The Front End Test Stand (FETS) under construction at the Rutherford Appleton Laboratory is the UK's contribution to research into the next generation of High Power Proton Accelerators (HPPAs). HPPAs are an essential part of any future Spallation Neutron Source, Neutrino Factory, Muon Collider, Accelerator Driven Sub-critical System, Waste Transmuter etc. FETS will demonstrate a high quality, high intensity, chopped H-minus beam and is a collaboration between RAL, Imperial College and the Universtity of Warwick in the UK and the Universidad del Pais Vasco in Spain. This paper describes the current status and future plans of FETS.

 
THPEC068 First Simulation Tests for the Bilbao Accelerator Ion Source Test Stand 4211
 
  • I. Bustinduy, D. Fernandez-Cañoto, D. de Cos
    ESS Bilbao, Bilbao
  • J. Alonso, M. Eguiraun, R. Enparantza, M. Larrañaga
    Fundación TEKNIKER, Eibar (Gipuzkoa)
  • F.J. Bermejo
    Bilbao, Faculty of Science and Technology, Bilbao
  • V. Etxebarria, J. Jugo, J. Portilla
    University of the Basque Country, Faculty of Science and Technology, Bilbao
  • D.C. Faircloth, S.R. Lawrie, A.P. Letchford
    STFC/RAL/ISIS, Chilton, Didcot, Oxon
  • J. Feuchtwanger
    ESS-Bilbao, Zamudio
  • S. Jolly
    Imperial College of Science and Technology, Department of Physics, London
  • J. Lucas
    Elytt Energy, Madrid
 
 

The rationale behind the Bilbao Accelerator Ion Source Test Stand (ITUR) project is to perform a comparison between different kinds of hydrogen ion sources using the same beam diagnostics setup. In particular, a direct comparison will be made in terms of the emittance characteristics of Penning-type sources such as those currently being used in ISIS (UK) and those of microwave type such as CEA-Saclay and INFN. The aim here pursued is to build an Ion Source Test Stand where virtually any type of source can be tested and, thus, compared to the results of other sources under the same gauge. It would then be possible to establish a common ground for effectively comparing different ion sources. The work here presented reports on the first simulations for the H-/H+ extraction system, as well the devices that conform the diagnostic vessel: Faraday Cup, Pepperpot and Retarding Potential Analyzer (RPA), among others.

 
THPEC069 Beam Dynamics Studies on the Radio-Frequency Quadrupole for the Bilbao Accelerator 4214
 
  • I. Bustinduy, N. Garmendia, H. Hassanzadegan, D. de Cos
    ESS Bilbao, Bilbao
  • F.J. Bermejo
    Bilbao, Faculty of Science and Technology, Bilbao
  • V. Etxebarria, J. Portilla
    University of the Basque Country, Faculty of Science and Technology, Bilbao
  • J. Feuchtwanger
    ESS-Bilbao, Zamudio
  • S. Jolly, J.K. Pozimski, P. Savage
    Imperial College of Science and Technology, Department of Physics, London
  • A.P. Letchford
    STFC/RAL/ISIS, Chilton, Didcot, Oxon
 
 

The main objective of the Bilbao Front End Test Stand (ETORFETS) is to set up a facility to demonstrate experimentally the design ideas for the future ESS LINAC that are being proposed in discussion forums by the technical scientific community. ETORFETS is focused on the first stage of the linear accelerator, namely, that of the Radio-Frequency Quadrupole (RFQ) and its pre and post beam transport systems. The RFQ bunches, focuses transverse and longitudinally, and accelerates charged particles in the low-energy range (up to ~ 3 MeV), thus becoming one of the main components of the accelerating structure. The first RFQ simulations, performed in Superfish and GPT software packages, will be presented in this work.