| Paper |
Title |
Page |
| THPMN073 |
Collimation Optimisation in the Beam Delivery System of the International Linear Collider
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2871 |
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- F. Jackson
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
- R. J. Barlow, A. M. Toader
UMAN, Manchester
- A. Latina, D. Schulte
CERN, Geneva
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The collimation systems of the International Linear Collider (ILC) Beam Delivery System (BDS) must perform efficient removal of halo particles which lie outside the acceptable ranges of energy and spatial spread. An optimisation strategy based on earlier work is applied to the latest version of the BDS lattice. The resulting improvement in collimation performance is studied by halo tracking simulations, and the luminosity performance of the optimised lattice is also examined.
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| THPMN076 |
PAMELA - A Model for an FFAG based Hadron Therapy Machine
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2880 |
| |
- J. K. Pozimski
Imperial College of Science and Technology, Department of Physics, London
- R. J. Barlow
UMAN, Manchester
- J. Cobb, T. Yokoi
OXFORDphysics, Oxford, Oxon
- B. Cywinski
University of Leeds, Leeds
- T. R. Edgecock
STFC/RAL, Chilton, Didcot, Oxon
- A. Elliott
Beatson Institute for Cancer Research, Glasgow
- M. Folkard, B. Vojnovic
Gray Cancer Institute, Northwood, Middlesex
- I. S.K. Gardner
STFC/RAL/ISIS, Chilton, Didcot, Oxon
- B. Jones
University Hospital Birmingham, Edgbaston, Birmingham
- K. Kirkby, R. Webb
UOSIBS, Guildford
- G. McKenna
University of Oxford, Oxford
- K. J. Peach
JAI, Oxford
- M. W. Poole
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
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Approximately one third of the world?s 15000 accelerators are used for tumour therapy and other medical applications. Most of these are room temperature cyclotrons: a few are synchrotrons. Neither of these have ideal characteristics for a dedicated medical accelerator. The characteristics of FFAGs make them ideally suited to such applications, as the much smaller magnet size, greater compactness and variable energy offers considerable cost and operational benefits especially in a hospital setting. In the first stage the work on PAMELA will focus on the optimization of the FFAG design to deliver the specific machine parameters demanded by therapy applications. In this phase of the PAMELA project the effort will concentrate on the design of a semi-scaling type FFAGs to deliver a 450 MeV/u carbon ion beam, including detailed lattice and tracking studies. The second stage will use the existing expertise in the BASROC consortium to undertake a design of the magnets and RF system for PAMELA. An outline of the overall concept of PAMELA will be discussed and the actual status of the work will be presented.
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| THPMN078 |
The CONFORM Project: Construction of a NonScaling FFAG and its Applications
|
2886 |
| |
- R. J. Barlow
UMAN, Manchester
- N. Bliss
STFC/DL, Daresbury, Warrington, Cheshire
- T. R. Edgecock
STFC/RAL, Chilton, Didcot, Oxon
- N. Marks, H. L. Owen, M. W. Poole
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
- K. J. Peach
JAI, Oxford
- J. K. Pozimski
Imperial College of Science and Technology, Department of Physics, London
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The CONFORM project, recently funded as part of the UK 'Basic Technology' initiative, will build a 20 MeV Non-Scaling FFAG (EMMA) at Daresbury. The experience gained will be used for the design of a proton machine (PAMELA) for medical research, and other applications for Non-Scaling FFAGs in different regimes will be explored. The successful development of this type of accelerator will provide many opportunities for increased exploitation, especially for hadron therapy for treatment of tumours, and the project provides a framework where machine builders will work with potential user communities to maximise the synergies and help this to happen successfully.
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| THPAN081 |
Collimator Wakefields: Formulae and Simulation
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3405 |
| |
- R. J. Barlow, A. Bungau, R. M. Jones
Cockcroft Institute, Warrington, Cheshire
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The effect of a leading particle on a trailing particle due to resistive and geometric wakefields in collimators can be described by expanding in a series of angular mode potentials Wm(s). Several formulae for these are given in the literature. We compare these formulae with numerical predictions from codes that solve the EM field equations, and explore the claimed regions of validity. We also explore how the EM code results can be used to numerically obtain angular mode potentials suitable for use in tracking codes.
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| THPAN068 |
Wakefield Models for Particle Tracking Codes
|
3378 |
| |
- A. Latina, G. Rumolo, D. Schulte
CERN, Geneva
- R. J. Barlow, A. Bungau
UMAN, Manchester
- G. A. Blair
Royal Holloway, University of London, Surrey
- J. D.A. Smith
Lancaster University, Lancaster
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Wakefields have a considerable effect on beam dynamics and they must not be neglected for emittance growth studies, background estimates and other problems. The codes used for these problems are normally not capable of self-consistent wakefield calculations. They should thus be extended with either analytical models or export the wakefields numerically evaluated with other codes (such as Gdfidl) when analytical models are not feasible. We discuss both approaches and present their implementation in PLACET, MERLIN and BDSIM. The simulation results for the ILC and CLIC beam delivery systems are given as an example. Results produced with different codes are compared.
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| THPAN079 |
Emittance Growth Due to High Order Angular Multipole Mode Wakefields in the ILC-BDS Collimators
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3402 |
| |
- A. Bungau, R. J. Barlow
UMAN, Manchester
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The passage of an off-axis bunch through the collimator gap induces higher order mode wakefields which can lead to emittance growth and consequently can affect the luminosity at the IP - a major concern for the ILC. The emittance growth due to high order angular multipole mode wakefields is calculated and beam profiles at the IP are presented in this paper.
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