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G. Moortgat-Pick,
I.R. Bailey,
D.P. Barber,
E Baynham,
A Birch,
T. Bradshaw,
A Brummitt,
S Carr,
J A Clarke,
P Cooke, [......],
A Lintern, L.I. Malysheva,
O.B. Malyshev,
J Rochford,
S. Riemann,
A. Schälicke,
P Schmid,
D.J. Scott,
A. Ushakov,
L Zang
[show abstract]
[hide abstract]
ABSTRACT: A short overview about the potential of polarized beams at future colliders is given. In particular the baseline design for polarized beams at the ILC is presented and the physics case for polarized $e^-$ and $e^+$ is discussed. In order to fulfil the precision requirements spin tracking from the source to the interaction point is needed. Updates concerning the theoretical calculations as well as their implementation in simulation codes are reported.
02/2008;
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O. B. Malyshev,
D. J. Scott,
I. R. Bailey,
D. P. Barber,
E. Baynham,
T. Bradshaw,
A. Brummitt,
S. Carr,
J. A. Clarke,
P. Cooke,
J. B. Dainton,
Y. Ivanyushenkov, L. I. Malysheva,
G. A. Moortgat-Pick,
J. Rochford
[show abstract]
[hide abstract]
ABSTRACT: The International Linear Collider (ILC) positron source uses a helical undulator to generate polarized photons of ∼10 MeV at the first harmonic. Unlike many undulators used in synchrotron radiation sources, the ILC helical undulator vacuum chamber will be bombarded by photons, generated by the undulator, with energies mostly below that of the first harmonic. Achieving the vacuum specification of ∼100 nTorr in a narrow chamber of 4–6 mm inner diameter, with a long length of 100–200 m , makes the design of the vacuum system challenging. This article describes the vacuum specifications and calculations of the flux and energy of photons irradiating the undulator vacuum chamber and considers possible vacuum system design solutions for two cases: cryogenic and room temperature.
Journal of Vacuum Science & Technology A Vacuum Surfaces and Films 08/2007; · 1.25 Impact Factor
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I.R. Bailey,
D.P. Barber,
A. Hartin, L.I. Malysheva,
G.A. Moortgat-Pick,
E. Baynham,
A. Birch,
T. Bradshaw,
A. Brummitt,
S. Carr,
J.A. Clarke,
P. Cooke,
J.B. Dainton,
Y. Ivanyushenkov,
L.J. Jenner,
A. Lintern,
O.B. Malyshev,
J. Rochford,
D.J. Scott,
L. Zang
[show abstract]
[hide abstract]
ABSTRACT: Polarized e<sup>-</sup> and e<sup>+</sup> beams are foreseen for the future International Linear Collider (ILC). High precision physics requires the polarization of both beams to be known with a relative uncertainty of about 0.1% or better. Therefore all possible depolarizing effects that could operate between the polarized sources and the interaction regions have to be under full control. This report gives a brief summary of ongoing work on the ILC spin-dynamics concentrating on recent results for depolarizing effects in the ILC damping rings, main linac, beam delivery system and beam-beam interactions. The polarization dependence of incoherent and second order coherent background processes have been taken into account as well as the treatment of spin precession in strong fields.
Particle Accelerator Conference, 2007. PAC. IEEE; 07/2007
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G A Moortgat-Pick, L I Malysheva,
I R Bailey,
P Cooke,
J B Dainton,
D P Barber,
J A Clarke,
O B Malyshev,
D J Scott,
E Baynham,
T Bradshaw,
A Brummitt,
S Carr,
Y Ivanyushenkov,
J Rochford
[show abstract]
[hide abstract]
ABSTRACT: Polarized and beams are foreseen for the future International Linear Collider (ILC) whose final basic de-sign considerations are currently under discussion. High precision physics requires the polarization of both beams to be known with a relative uncertainty of about 0.5% or bet-ter. Therefore all possible depolarizing effects that could operate between the polarized sources and the interaction regions have to be under full control. The 'heLiCal' collaboration aims to provide a full 'cradle-to-grave' analysis of all depolarizing effects at the ILC. This report gives a brief summary of ongoing work on the ILC spin-dynamics concentrating on recent results for depolarizing effects in the ILC damping rings, beam delivery system and beam-beam interactions. The effects during the beam-beam interactions have been evaluated for a range of ILC parameter sets.
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I R Bailey,
A F Hartin,
G A Moortgat-Pick,
J A Clarke,
D P Barber,
E Baynham,
T W Bradshaw,
A Brummitt,
A Bungau,
F S Carr, [......],
K M Hock,
L J Jenner,
A Lintern,
O B Malyshev, L I Malysheva,
J Rochford,
N C Ryder,
D J Scott,
B J A Shepherd,
L Zang
[show abstract]
[hide abstract]
ABSTRACT: The clean environment of a lepton linear collider allows high-precision measurements for physics analyses. In or-der to exploit this potential, precise knowledge about the polarization state of the beams is also required. In this pa-per 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 sim-ulation programs are reported. Numerical results for the design of the International Linear Collider (ILC) are dis-cussed.
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I R Bailey,
D P Barber,
A Hartin, L I Malysheva,
G A Moortgat-Pick,
E Baynham,
A Birch,
T Bradshaw,
A Brummitt,
S Carr,
J A Clarke,
P Cooke,
J B Dainton,
Y Ivanyushenkov,
L J Jenner,
A Lintern,
O B Malyshev,
J Rochford,
D J Scott,
L Zang
[show abstract]
[hide abstract]
ABSTRACT: Polarized e − and e + beams are foreseen for the future International Linear Collider (ILC). High precision physics requires the polarization of both beams to be known with a relative uncertainty of about 0.1% or better. Therefore all possible depolarizing effects that could operate between the polarized sources and the interaction regions have to be under full control. This report gives a brief summary of ongoing work on the ILC spin-dynamics concentrating on recent results for depolarizing effects in the ILC damping rings, main linac, beam delivery system and beam-beam interactions. The polarization dependence of incoherent and second order coherent background processes have been taken into ac-count as well as the treatment of spin precession in strong fields.
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J A Clarke,
DESY Maschinenphysik,
J Rochford,
E Baynham,
T. Bradshaw,
A Brummitt,
S Carr,
Y Ivanyushenkov,
O.B. Malyshev,
D.J. Scott,
I.R. Bailey,
P Cooke,
J B Dainton, L.I. Malysheva,
D.P. Barber
10th biennial European Particle Accelerator Conference,Edinburgh,United Kingdom (2006),715-717.
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Y Ivanyushenkov,
DESY Maschinenphysik,
J Rochford,
E Baynham,
T. Bradshaw,
A Brummitt,
S Carr,
J A Clarke,
O.B. Malyshev,
D.J. Scott,
I.R. Bailey,
P Cooke,
J B Dainton, L.I. Malysheva,
D.P. Barber,
G.A. Moortgat-Pick
10th biennial European Particle Accelerator Conference,Edinburgh,United Kingdom (2006),706-708.
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D.J. Scott,
DESY Maschinenphysik,
S Appleton,
J A Clarke,
O.B. Malyshev,
B J A Shepherd,
B Todd,
D E Baynham,
T. Bradshaw,
A Brummitt,
S Carr,
Y Ivanyushenkov,
J Rochford,
I.R. Bailey,
P Cooke,
J B Dainton, L.I. Malysheva,
D.P. Barbery
Phys. Rev. STAB 10(2007),032401.
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G.A. Moortgat-Pick,
DESY Maschinenphysik,
J Rochford,
E Baynham,
T. Bradshaw,
A Brummitt,
S Carr,
Y Ivanyushenkov,
J A Clarke,
O.B. Malyshev,
D.J. Scott,
I.R. Bailey,
P Cooke,
J B Dainton, L.I. Malysheva,
D.P. Barber
10th biennial European Particle Accelerator Conference,Edinburgh,United Kingdom (2006),2454-2456.
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J Rochford,
DESY Maschinenphysik,
E Baynham,
T. Bradshaw,
A Brummitt,
S Carr,
Y Ivanyushenkov,
J A Clarke,
O.B. Malyshev,
D.J. Scott,
I.R. Bailey,
P Cooke,
J B Dainton, L.I. Malysheva,
D.P. Barber,
G.A. Moortgat-Pick
10th biennial European Particle Accelerator Conference,Edinburgh,United Kingdom (2006),840.
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Cockcroft Report (2008),.
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J Clarke,
DESY DESY Standort Zeuthen,
W. Gai,
Y Ivanyushenkov,
W Liu,
G.A. Moortgat-Pick,
I.R. Bailey,
J Dainton,
K.M. Hock,
L.J. Jenner, [......],
J Sheppard,
N Collomb,
N.C. Ryder,
E Baynham,
T. W. Bradshaw,
A Brummitt,
F.S. Carr,
A Lintern,
J Rochford,
A Bungau
11th European Particle Accelerator Conference,Genoa,Italy (2008),WEOBG03.
