Positron Collection in Linear Collider

Abstract

In the Linear Collider design, the positron capture system includes a positron production target, followed by an adiabatic matching device (solenoid), a pre-linac with solenoidal focusing, and a linac with quadrupole focusing before injection into a positron damping ring. Two schemes for positron production have been studied: (1) a conventional approach with high-energy electron beam interacting with a high-Z target and (2) polarized positron production using polarized photons generated in a helical undulator by a primary collider electron beam which then interact with a positron production target. The capture efficiencies for both schemes are compared. Various parameters affecting the positron capture are analyzed.

Analysis of Positron Collection in the Linear Collider

Batygin, Yuri K.af SLAC May 2005

In the Linear Collider, the positron capture system includes a positron production target, an adiabatic matching device (AMD), and a linac to accelerate positrons up to the injection energy of the positron damping ring. Efficiency of the positron collector is defined by the number of positrons accepted into the damping ring. Analysis of the positron collection system is performed using a conventional scheme, where positrons are produced by a high-energy electron beam hitting the high-Z target. The collection system has been optimized to insure high positron capture into the 6-dimensional acceptance of the damping ring. Various parameters affecting the positronmore » capture are analyzed.« less
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SLC (SLAC Linear Collider) positron source startup

Clendenin, J.E. ; Bartha, G. ; DeStaebler, H. ; ... September 1988

The turnon experience and initial operating parameters of the SLAC Linear Collider positron source are described. 6 refs., 7 figs.
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Single-Bunch Instability Driven by the Electron Cloud Effect inthe Positron Damping Ring of the International Linear Collider

Pivi, Mauro ; Raubenheimer, Tor O. ; Ghalam, Ali ; ... May 2005

Collective instabilities caused by the formation of an electron cloud (EC) are a potential limitation to the performances of the damping rings for a future linear collider. In this paper, we present recent simulation results for the electron cloud build-up in damping rings of different circumferences and discuss the single-bunch instabilities driven by the electron cloud.
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Single-Bunch Instability Driven by the Electron Cloud Effect in the Positron Damping Ring of the International Linear Collider

Pivi, M ; Raubenheimer, T. ; /SLAC ; ... May 2005
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Electron Cloud in the Wigglers of the Positron Damping Ring of the International Linear Collider

Wang, L. ; /SLAC July 2007

The ILC positron damping ring comprises hundreds of meters of wiggler sections, where many more photons than in the arcs are emitted, and with the smallest beampipe aperture of the ring. A significant electron-cloud density can therefore be accumulated via photo-emission and via beam-induced multipacting. In field-free regions the electron-cloud build up may be suppressed by adding weak solenoid fields, but the electron cloud remaining in the wigglers as well as in the arc dipole magnets can still drive single-bunch and multi-bunch beam instabilities. This paper studies the electron-cloud formation in an ILC wiggler section for various scenarios, as wellmore »« less
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Title: Positron Collection in Linear Collider

Abstract

Citation Formats

Analysis of Positron Collection in the Linear Collider

SLC (SLAC Linear Collider) positron source startup

Single-Bunch Instability Driven by the Electron Cloud Effect inthe Positron Damping Ring of the International Linear Collider

Single-Bunch Instability Driven by the Electron Cloud Effect in the Positron Damping Ring of the International Linear Collider

Electron Cloud in the Wigglers of the Positron Damping Ring of the International Linear Collider