EPAC 2006 - List of Authors

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Dainton, J.B.

Paper	Title	Page
MOPLS055	A Lepton-proton Collider with LHC	670
	F.J. Willeke DESY, Hamburg J.B. Dainton Cockcroft Institute, Warrington, Cheshire M. Klein DESY Zeuthen, Zeuthen P. Newman Birmingham University, Birmingham E. Perez CEA, Gif-sur-Yvette
	The physics, and a design, of a Large Hadron Electron Collider (LHeC) are sketched. With high luminosity, 10³³cm-2s-1, and high energy, ?s = 1.4TeV, such a collider can be built in which a 70GeV electron (positron) beam in the LHC tunnel is in collision with one of the LHC hadron beams and which operates simultaneously with the LHC. The LHeC makes possible deep-inelastic lepton-hadron (ep, eD and eA) scattering for momentum transfers Q2 beyond 106GeV2 and for Bjorken x down to the 10-6. New sensitivity to the existence of new states of matter, primarily in the lepton-quark sector and in dense partonic systems, is achieved. The precision possible with an electron-hadron experiment brings in addition crucial accuracy in the determination of hadron structure, as described in Quantum Chromodynamics, and of parton dynamics at the TeV energy scale. The LHeC thus complements the proton-proton and ion programmes, adds substantial new discovery potential to them, and is important for a full understanding of physics in the LHC energy range. Contributed to the Open Symposium on European Strategy for Particle Physics Research, LAL Orsay, France, January 30th to February 1st , 2006. hep-ex/0603016 DESY 06-00Cockcroft-06-05
MOPLS069	Development of a Superconducting Helical Undulator for the ILC Positron Source	706
	Y. Ivanyushenkov, E. Baynham, T.W. Bradshaw, A.J. Brummitt, F.S. Carr, J. Rochford CCLRC/RAL, Chilton, Didcot, Oxon I.R. Bailey, D.P. Barber, J.A. Clarke, J.B. Dainton, O.B. Malyshev, D.J. Scott, B.J.A. Shepherd Cockcroft Institute, Warrington, Cheshire P. Cooke, L.I. Malysheva Liverpool University, Science Faculty, Liverpool G.A. Moortgat-Pick CERN, Geneva
	An undulator positron source has been recently selected by the International Linear Collider (ILC) community as a baseline. For the ILC a helical undulator capable of producing 10 MeV photons and with a period as close as possible to 10 mm is required. The HeliCal collaboration in the UK is looking at the merits of both permanent magnet and superconducting technologies for the design of a helical undulator. For the superconducting option, several prototypes have been built and tested. This paper details the design, construction and test results of the first superconducting prototypes.
WEPLS032	Spin Tracking at the ILC	2454
	G.A. Moortgat-Pick, I.R. Bailey, D.P. Barber, J.A. Clarke, J.B. Dainton, O.B. Malyshev, G.A. Moortgat-Pick, D.J. Scott Cockcroft Institute, Warrington, Cheshire E. Baynham, T.W. Bradshaw, A.J. Brummitt, F.S. Carr, Y. Ivanyushenkov, J. Rochford CCLRC/RAL, Chilton, Didcot, Oxon P. Cooke, L.I. Malysheva Liverpool University, Science Faculty, Liverpool
	Polarized beams will play a key role in the physics programme at the International Linear Collider (ILC). It is expected that the electron and positron sources will be able to produce beams with polarizations of about 90% and 60% respectively. However, to obtain accurate measurements it is essential to have precise knowledge and control of the polarization at the interaction point itself. It follows that the theoretical calculations used for spin tracking must be guaranteed to match the anticipated 0.1% relative measurement uncertainty of the polarimeters. To meet this need, the heLiCal collaboration is developing a computer simulation to track the evolution of the polarization of bunches of electrons and positrons from the sources to the interaction point. We have studied the beam spin dynamics throughout the ILC including spin precession and radiative spin-flip processes in the positron source, damping rings, beam delivery system and the interaction region. We present the result of these studies with special emphasis on the impact of new theoretical calculations for the CAIN bunch-bunch simulation including full spin correlations and higher-order contributions.
WEPLS048	Development of a Positron Production Target for the ILC Positron Source	2484
	I.R. Bailey, I.R. Bailey, J.B. Dainton, D.J. Scott Cockcroft Institute, Warrington, Cheshire V. Bharadwaj, J. Sheppard SLAC, Menlo Park, California P. Cooke, P. Sutcliffe Liverpool University, Science Faculty, Liverpool J.G. Gronberg, D.J. Mayhall, W.T. Piggott, W. Stein LLNL, Livermore, California
	The future International Linear Collider (ILC) will require of order 10¹⁴ positrons per second to fulfil its luminosity requirements. The current baseline design produces this unprecedented flux of positrons using an undulator-based source. In this concept, a collimated beam of 10MeV photons produced from the action of an undulator on the main electron beam of the ILC is incident on a conversion target. Positrons produced in the resulting electromagnetic shower can then be captured, accelerated and injected into a damping ring. The international community is pursuing several alternative technologies to develop a target capable of long-term operation in the intense photon beam. In the design being developed jointly by the Cockcroft Institute, LLNL and SLAC, a thin (0.4 radiation length) water-cooled Titanium alloy target wheel of diameter 4m is rotated at approximately 1000rpm to spread the incident power of each pulse over a wide area. We present the latest target design, report on the status of the target prototypes and computer models, and review the interplay between the target technology, capture optics, photon collimator and remote-handling systems.
MOPLS072	Status of the HeLiCal Contribution to the Polarised Positron Source for the International Linear Collider	715
	J.A. Clarke, O.B. Malyshev, D.J. Scott CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire I.R. Bailey, P. Cooke, J.B. Dainton, L.I. Malysheva Liverpool University, Science Faculty, Liverpool D.P. Barber DESY, Hamburg E. Baynham, T.W. Bradshaw, A.J. Brummitt, F.S. Carr, Y. Ivanyushenkov, J. Rochford CCLRC/RAL, Chilton, Didcot, Oxon G.A. Moortgat-Pick Durham University, Durham
	The baseline positron source for the International Linear Collider is a helical undulator-based design, which can generate unprecedented quantities of polarised positrons. A major thrust of the global design in this area is led by the UK-based HeLiCal collaboration. The collaboration takes responsibility for the design and prototyping of the helical undulator itself, which is a highly demanding short period device with very small aperture, and also leads the start to end simulations of the polarised particles to ensure that the high polarisation levels generated are maintained from the source, right through the beam transport systems and up to the interaction point itself. This paper will provide an update on the work of the collaboration, focusing on these two topic areas, and will also discuss future plans.
MOPLS118	Magnetic Modelling of a Short-period Superconducting Helical Undulator for the ILC Positron Source	840
	J. Rochford, E. Baynham, T.W. Bradshaw, F.S. Carr CCLRC/RAL/ASTeC, Chilton, Didcot, Oxon I.R. Bailey, L.I. Malysheva Cockcroft Institute, Warrington, Cheshire D.P. Barber DESY, Hamburg A.J. Brummitt, Y. Ivanyushenkov CCLRC/RAL, Chilton, Didcot, Oxon J.A. Clarke, O.B. Malyshev, D.J. Scott CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire P. Cooke, J.B. Dainton Liverpool University, Science Faculty, Liverpool G.A. Moortgat-Pick Durham University, Durham
	A positron source utilising undulators is now defined as the baseline option for the International Linear Collider (ILC). The ILC requires a short period undulator, as close to 10mm as possible, that is capable of producing 10 MeV photons. The HeliCal collaboration in the UK has undertaken a programme to design, develop and produce a prototype undulator. As part of the programme, the group has used the OPERA software package to perform the magnetic design of the undulator. The design has addressed several issues, including the effect of magnetic material for the undulator former, optimal winding geometry, the magnetic flux inside the superconductor and its variation with undulator period and the winding bore. This paper summarizes the results of both the 2d and the 3d magnetic simulations.