EPAC08 - List of Authors (Shepherd, B. J.A.)

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Shepherd, B. J.A.

Paper	Title	Page
MOPP024	Depolarization and Beam-beam Effects at the Linear Collider	598
	G. A. Moortgat-Pick, S. Hesselbach Durham University, Durham I. R. Bailey, G. A. Moortgat-Pick, B. J.A. Shepherd Cockcroft Institute, Warrington, Cheshire D. P. Barber DESY, Hamburg E. Baynham, T. W. Bradshaw, F. S. Carr, J. Rochford STFC/RAL/ASTeC, Chilton, Didcot, Oxon A. J. Brummitt, A. J. Lintern STFC/RAL, Chilton, Didcot, Oxon A. Bungau UMAN, Manchester J. A. Clarke, O. B. Malyshev, N. C. Ryder, D. J. Scott STFC/DL/ASTeC, Daresbury, Warrington, Cheshire J. B. Dainton, K. M. Hock, L. J. Jenner, L. I. Malysheva, L. Zang Liverpool University, Science Faculty, Liverpool A. F. Hartin OXFORDphysics, Oxford, Oxon
	The clean environment at the interaction point of a lepton linear collider allows high-precision measurements for physics analyses. In order to exploit this potential, precise knowledge about the polarization state of the beams is also required. In this paper we concentrate on depolarization effects caused by the intense beam-beam interaction, which is expected to be the dominant source of depolarization. Higher-order effects, as well as critical analyses of the theoretical assumptions used in the past and theoretical improvements in the derivation of suitable equations, are given. Updates on existing simulation programs are reported. Numerical results for the design of the International Linear Collider (ILC) are discussed.
WEPC156	Development and Adjustment of the EMMA Quadrupole Magnets	2374
	N. Marks, B. J.A. Shepherd STFC/DL/ASTeC, Daresbury, Warrington, Cheshire M. J. Crawley, F. T.D. Goldie, B. Leigh Tesla Engineering Limited, West-Sussex
	The non-scaling FFAG EMMA, now under construction at STFC’s Daresbury Laboratory, requires 84 quadrupoles. Because of the unusual nature of these magnets, prototypes for the F and the D type quadrupoles were required. These magnets were ordered from and constructed and measured by Tesla Engineering. Subsequently, design changes have been made and modifications to the prototypes carried out. The paper will give engineering details of these prototypes, of the measurement results obtained using a rotating coil magnetometer and subsequent adjustments to clamp plates and pole profiles needed to obtain optimum three dimensional gradient quality. As a result of these developments, the construction of the magnets for the complete ring is now underway. B. J.A. Shepherd & N. Marks, “Quadrupole Magnets For The 20MeV FFAG, ‘EMMA’”, PAC 2007 (MOPAN107).
MOPP070	Construction of a Full Scale Superconducting Undulator Module for the International Linear Collider Positron Source	709
	J. A. Clarke, O. B. Malyshev, D. J. Scott, B. J.A. Shepherd STFC/DL/ASTeC, Daresbury, Warrington, Cheshire I. R. Bailey, J. B. Dainton, K. M. Hock, L. J. Jenner, L. I. Malysheva, L. Zang Liverpool University, Science Faculty, Liverpool E. Baynham, T. W. Bradshaw, A. J. Brummitt, F. S. Carr, A. J. Lintern, J. Rochford STFC/RAL, Chilton, Didcot, Oxon A. Bungau UMAN, Manchester N. A. Collomb STFC/DL, Daresbury, Warrington, Cheshire A. F. Hartin OXFORDphysics, Oxford, Oxon S. Hesselbach, G. A. Moortgat-Pick Durham University, Durham Y. Ivanyushenkov ANL, Argonne, Illinois N. C. Ryder University of Bristol, Bristol
	The positron source for the ILC is dependent upon a >200m long undulator to generate a high flux of multi-MeV photons. The undulator system is broken down into a series of 4m cryomodules, which each contain two superconducting helical undulators. Following a dedicated R&D phase and the construction and measurement of a number of short prototypes a full scale cryomodule has now been completed for the first time. This paper reports on the design, manufacture, and test results of this cryomodule.
THPP004	EMMA - the World's First Non-scaling FFAG	3380
	T. R. Edgecock STFC/RAL, Chilton, Didcot, Oxon C. D. Beard, J. A. Clarke, C. Hill, S. P. Jamison, A. Kalinin, K. B. Marinov, N. Marks, P. A. McIntosh, B. D. Muratori, H. L. Owen, Y. M. Saveliev, B. J.A. Shepherd, R. J. Smith, S. L. Smith, S. I. Tzenov, E. Wooldridge STFC/DL/ASTeC, Daresbury, Warrington, Cheshire J. S. Berg, D. Trbojevic BNL, Upton, Long Island, New York N. Bliss, C. J. White STFC/DL, Daresbury, Warrington, Cheshire M. K. Craddock UBC & TRIUMF, Vancouver, British Columbia J. L. Crisp, C. Johnstone Fermilab, Batavia, Illinois Y. Giboudot Brunel University, Middlesex E. Keil CERN, Geneva D. J. Kelliher, S. Machida STFC/RAL/ASTeC, Chilton, Didcot, Oxon S. R. Koscielniak TRIUMF, Vancouver F. Meot CEA, Gif-sur-Yvette T. Yokoi OXFORDphysics, Oxford, Oxon
	EMMA - the Electron Model of Many Applications - is to be built at the STFC Daresbury Laboratory in the UK and will be the first non-scaling FFAG ever constructed. EMMA will be used to demonstrate the principle of this type of accelerator and study their features in detail. The design of the machine and its hardware components are now far advanced and construction is due for completion in summer 2009.