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Title:

Degradation of multibunch luminosity in a linear collider due to cumulative beam breakup

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Beam-excited transverse wakes in accelerating radiofrequency structures will influence the transverse offsets of each bunch in a multibunch train, causing the projected emittance of the bunch train to grow. An analytic theory of this phenomenon that includes the mitigating influence of a correlated energy spread across the bunch train was recent...

Beam-excited transverse wakes in accelerating radiofrequency structures will influence the transverse offsets of each bunch in a multibunch train, causing the projected emittance of the bunch train to grow. An analytic theory of this phenomenon that includes the mitigating influence of a correlated energy spread across the bunch train was recently devised and applied to electron-positron linear colliders. We use the results of this theory to estimate analytically the associated degradation of multibunch luminosity in terms of top-level parameters for the two beams, the two accelerators, and the final-focus system. Then we compare the estimates with results from GUINEA-PIG, a code that includes the detailed physics of beam-beam interactions. Minimize

Year of Publication:

2008-05-12

Subjects:

43 PARTICLE ACCELERATORS; BEAM-BEAM INTERACTIONS; LINEAR COLLIDERS; BEAM LUMINOSITY; RF SYSTEMS; TRANSVERSE MOMENTUM; BEAM BUNCHING; BEAM EMITTANCE; ELECTRON-POSITRON INTERACTIONS; G CODES

43 PARTICLE ACCELERATORS; BEAM-BEAM INTERACTIONS; LINEAR COLLIDERS; BEAM LUMINOSITY; RF SYSTEMS; TRANSVERSE MOMENTUM; BEAM BUNCHING; BEAM EMITTANCE; ELECTRON-POSITRON INTERACTIONS; G CODES Minimize

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530 Physics *(computed)*

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Title:

CLIC status and outlook

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The Compact Linear Collider study (CLIC) is in the process of completing a Conceptual Design Report for a multi-TeV linear electron-positron collider. The CLIC-concept is based on high gradient normal-conducting accelerating structures. The RF power for the acceleration of the colliding beams is produced by a novel two beam acceleration scheme, ...

The Compact Linear Collider study (CLIC) is in the process of completing a Conceptual Design Report for a multi-TeV linear electron-positron collider. The CLIC-concept is based on high gradient normal-conducting accelerating structures. The RF power for the acceleration of the colliding beams is produced by a novel two beam acceleration scheme, where power is extracted from a high current drive beam that runs parallel with the main linac. In order to establish the feasibility of this concept a number of key issues have been addressed. A short summary of the progress and status of the corresponding studies will be given. Minimize

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The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2012-05-08

Source:

http://pos.sissa.it/archive/conferences/134/036/EPS-HEP2011_036.pdf

http://pos.sissa.it/archive/conferences/134/036/EPS-HEP2011_036.pdf Minimize

Document Type:

text

Language:

en

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Metadata may be used without restrictions as long as the oai identifier remains attached to it.

Metadata may be used without restrictions as long as the oai identifier remains attached to it. Minimize

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Title:

Luminosity Monitor Options for TESLA

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The feasibility of a luminosity monitor based on a radiative Bhabha, beamstrahlung photons or e + e , detectors, is investigated in the context of the TESLA [1] linear collider. 1 INTRODUCTION During the normal operation of a linear collider, while the beam are in collisions, the detuning of the final focus optics must be controlled in such a wa...

The feasibility of a luminosity monitor based on a radiative Bhabha, beamstrahlung photons or e + e , detectors, is investigated in the context of the TESLA [1] linear collider. 1 INTRODUCTION During the normal operation of a linear collider, while the beam are in collisions, the detuning of the final focus optics must be controlled in such a way that the luminosity stays maximum. The required on-line tuning procedure should be the least invasive in order to lose the least luminosity up-time. The beam-beam deflection scan method in use at the SLC [2] allows one to measure the convoluted spot sizes of both beams with a limited impact on the machine operation. For TESLA [1] however, the large vertical disruption of the colliding beams (cf. Table 1), characterised by the disruption parameter D y =33, precludes the measurement of the vertical spot size by this method. However, Table 1: TESLA parameters at the IP for p s = 500 GeV Beam sizes # # x ;# # y [nm] 558 , 5 Emittances #. Minimize

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The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2009-04-14

Source:

http://www-dapnia.cea.fr/Doc/Publications/Sea/./Archives/sea-97-14.pdf

http://www-dapnia.cea.fr/Doc/Publications/Sea/./Archives/sea-97-14.pdf Minimize

Document Type:

text

Language:

en

DDC:

535 Light & infrared & ultraviolet phenomena *(computed)*

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Metadata may be used without restrictions as long as the oai identifier remains attached to it.

Metadata may be used without restrictions as long as the oai identifier remains attached to it. Minimize

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Universität Dortmund Gutachter:

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Matr.-Nr. 96782, Fachbereich Informatik, Universität DortmundIn den vergangenen Monaten durfte ich einen erheblichen Teil meiner Zeit in diese Diplomarbeit investieren. Dementsprechend mussten viele Bekannte und Freunde, aber auch z. T. meine Familie bei verschiedenen Gelegenheiten auf mich verzichten. Auch bei einigen Projekten, die ich sonst g...

Matr.-Nr. 96782, Fachbereich Informatik, Universität DortmundIn den vergangenen Monaten durfte ich einen erheblichen Teil meiner Zeit in diese Diplomarbeit investieren. Dementsprechend mussten viele Bekannte und Freunde, aber auch z. T. meine Familie bei verschiedenen Gelegenheiten auf mich verzichten. Auch bei einigen Projekten, die ich sonst gern mit meiner ehrenamtlichen Tätigkeit unterstütze, musste ich kürzer treten. Ich möchte mich bei allen für ihre Geduld und ihr Verständnis, aber auch für ihren Zuspruch bedanken. Ganz besonderen Dank möchte ich aber an jene richten, die mich aktiv beim Erstellen dieser Arbeit unterstützt haben. Die Mitarbeiter am Lehrstuhl, insbesondere Dr. Heiko Falk Minimize

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The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2012-06-15

Source:

http://ls12-www.cs.tu-dortmund.de/daes/media/documents/theses/schulte.pdf

http://ls12-www.cs.tu-dortmund.de/daes/media/documents/theses/schulte.pdf Minimize

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text

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en

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Metadata may be used without restrictions as long as the oai identifier remains attached to it.

Metadata may be used without restrictions as long as the oai identifier remains attached to it. Minimize

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Title:

HALO AND TAIL SIMULATIONS WITH APPLICATION TO THE CLIC DRIVE BEAM

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Unpublished

Year of Publication:

2009

Document Type:

Text ; Conference Paper

Language:

en

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(LAPP, Annecy)

Author:

Boris Ivanovich Grishanov ; Pavel Logachev ; Fedor Podgorny ; Valery Telnov ; Deepa Angal-kalinin ; James Jones ; Er Kalinin ; Olivier Napoly ; Jacques Payet ; Hans-heinrich Braun ; ...

Boris Ivanovich Grishanov ; Pavel Logachev ; Fedor Podgorny ; Valery Telnov ; Deepa Angal-kalinin ; James Jones ; Er Kalinin ; Olivier Napoly ; Jacques Payet ; Hans-heinrich Braun ; Daniel Schulte ; Frank Zimmermann ; Roger Barlow ; Ian Bailey ; Leo Jenner ; Roger Jones ; German Kourevlev ; Eckhard Elsen ; Vladimir Vogel ; Nick Walker ; Nikolay Solyak ; Manfred Wendt ; Tohru Takahashi ; Jie Gao ; Weibin Liu ; Guo-xi Pei ; Jiu-qing Wang ; Nicolas Delerue ; Sudhir Dixit ; David Howell ; Armin Reichold ; David Urner ; Michael Price ; Yoshihisa Iwashita ; Takanori Mihara ; Maria Alabau Pons ; Philip Bambade ; Olivier Dadoun ; Andy Wolski ; Jeff Gronberg ; Stewart Takashi Boogert ; Alexey Liapine ; Stephen Malton ; David J. Miller ; Matthew Wing ; Masayuki Kumada ; Samuel Danagoulian ; Sekazi Mtingwa Minimize authors

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Vol. 2

Vol. 2 Minimize

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The Pennsylvania State University CiteSeerX Archives

Year of Publication:

2013-01-25

Source:

http://arxiv.org/pdf/physics/0606194v1.pdf

http://arxiv.org/pdf/physics/0606194v1.pdf Minimize

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text

Language:

en

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Title:

Polygonal Complexes and Graphs for Crystallographic Groups

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The paper surveys highlights of the ongoing program to classify discrete polyhedral structures in Euclidean 3-space by distinguished transitivity properties of their symmetry groups, focussing in particular on various aspects of the classification of regular polygonal complexes, chiral polyhedra, and more generally, two-orbit polyhedra. ; Commen...

The paper surveys highlights of the ongoing program to classify discrete polyhedral structures in Euclidean 3-space by distinguished transitivity properties of their symmetry groups, focussing in particular on various aspects of the classification of regular polygonal complexes, chiral polyhedra, and more generally, two-orbit polyhedra. ; Comment: 21 pages; In: Symmetry and Rigidity, (eds. R.Connelly, A.Ivic Weiss and W.Whiteley), Fields Institute Communications, to appear Minimize

Year of Publication:

2013-10-18

Document Type:

text

Subjects:

Mathematics - Combinatorics ; Mathematics - Metric Geometry

Mathematics - Combinatorics ; Mathematics - Metric Geometry Minimize

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Title:

Regular Polygonal Complexes in Space, I

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A polygonal complex in euclidean 3-space is a discrete polyhedron-like structure with finite or infinite polygons as faces and finite graphs as vertex-figures, such that a fixed number r of faces surround each edge. It is said to be regular if its symmetry group is transitive on the flags. The present paper and its successor describe a complete ...

A polygonal complex in euclidean 3-space is a discrete polyhedron-like structure with finite or infinite polygons as faces and finite graphs as vertex-figures, such that a fixed number r of faces surround each edge. It is said to be regular if its symmetry group is transitive on the flags. The present paper and its successor describe a complete classification of regular polygonal complexes in 3-space. In particular, the present paper establishes basic structure results for the symmetry groups, discusses geometric and algebraic aspects of operations on their generators, characterizes the complexes with face mirrors as the 2-skeletons of the regular 4-apeirotopes in 3-space, and fully enumerates the simply flag-transitive complexes with mirror vector (1,2). The second paper will complete the enumeration. ; Comment: Transactions American Mathematical Society (to appear), 41 pages, 9 figures Minimize

Year of Publication:

2009-06-05

Document Type:

text

Subjects:

Mathematics - Metric Geometry ; Mathematics - Combinatorics ; 51M20 ; 52B15

Mathematics - Metric Geometry ; Mathematics - Combinatorics ; 51M20 ; 52B15 Minimize

DDC:

514 Topology *(computed)*

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Title:

Study of gamma gamma Background in e+e- -> W+W- nu nu -> H nu nu Events at the Tesla e+e- Linear Collider

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The effect of the overlap of gamma gamma -> hadrons to H nu nu events has been studied for the case of the Tesla e+e- linear collider at 350 GeV. It was found that, due to the significant bunch length and the track extrapolation accuracy provided by the Vertex Tracker, the gamma gamma background to physics events can be substantially reduced, wi...

The effect of the overlap of gamma gamma -> hadrons to H nu nu events has been studied for the case of the Tesla e+e- linear collider at 350 GeV. It was found that, due to the significant bunch length and the track extrapolation accuracy provided by the Vertex Tracker, the gamma gamma background to physics events can be substantially reduced, with moderate loss in reconstruction efficiency, by a combination of kinematical and vertex topology observables. The remaining background, being confined to very forward hadron production, does not significantly interfere with the event reconstruction. ; Comment: 6 pages, 3 figures, contributed to the 2nd ECFA-DESY Workshop on Physics and Detectors for a Linear Electron-Positron Collider Minimize

Year of Publication:

2000-11-27

Document Type:

text

Subjects:

High Energy Physics - Experiment

High Energy Physics - Experiment Minimize

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Title:

Regular Polygonal Complexes in Space, II

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Regular polygonal complexes in euclidean 3-space are discrete polyhedra-like structures with finite or infinite polygons as faces and with finite graphs as vertex-figures, such that their symmetry groups are transitive on the flags. The present paper and its predecessor describe a complete classification of regular polygonal complexes in 3-space...

Regular polygonal complexes in euclidean 3-space are discrete polyhedra-like structures with finite or infinite polygons as faces and with finite graphs as vertex-figures, such that their symmetry groups are transitive on the flags. The present paper and its predecessor describe a complete classification of regular polygonal complexes in 3-space. In Part I we established basic structural results for the symmetry groups, discussed operations on their generators, characterized the complexes with face mirrors as the 2-skeletons of the regular 4-apeirotopes in 3-space, and fully enumerated the simply flag-transitive complexes with mirror vector (1,2). In this paper, we complete the enumeration of all regular polygonal complexes and in particular describe the simply flag-transitive complexes for the remaining mirror vectors. It is found that, up to similarity, there are precisely 25 regular polygonal complexes which are not regular polyhedra, namely 21 simply flag-transitive complexes and 4 complexes which are 2-skeletons of regular 4-apeirotopes. ; Comment: 35 pages; to appear in Transactions AMS Minimize

Year of Publication:

2012-10-07

Document Type:

text

Subjects:

Mathematics - Combinatorics ; Mathematics - Metric Geometry ; 51M20 ; 52B15

Mathematics - Combinatorics ; Mathematics - Metric Geometry ; 51M20 ; 52B15 Minimize

DDC:

540 Chemistry & allied sciences *(computed)*

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