| Paper |
Title |
Page |
| WEPLS045 |
Study on Low-energy Positron Polarimetry
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2475 |
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- A. Schaelicke, K. Laihem, S. Riemann, A. Ushakov
DESY Zeuthen, Zeuthen
- R. Dollan, Th. Lohse
Humboldt University Berlin, Institut für Physik, Berlin
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For the design of the International Linear Collider (ILC) a polarised positron source based on a helical undulator system has been proposed. In order to optimise the positron beam, i.e., to ensure high intensity as well as high degree of polarisation, a measurement of the polarisation close to the positron creation point is envisaged. In this contribution methods to determine the positron polarisation at low energies are investigated. These studies are based on simulations with an extended version of Geant4, which allows the tracking of polarised particles taking into account the spin effects.
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| WEPLS046 |
Radiation Levels and Activation at the ILC Positron Source
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2478 |
| |
- A. Ushakov, S. Riemann
DESY Zeuthen, Zeuthen
- Eckhard. Elsen, K. Floettmann
DESY, Hamburg
- K.N. Sanosyan
CANDLE, Yerevan
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An undulator-based positron source is recommended as baseline design for the International Linear Collider (ILC). Photons generated by electrons passing an undulator hit a rotating target and create electron-positron pairs. The positrons are captured and accelerated. An advantage of this source is the significantly lower radiation level in comparison to a conventional positron source which uses the electron beam directly to produce electron-positron pairs. The fluxes of neutrons and photons have been calculated with the particle transport code FLUKA. The activation of the positron source components has been estimated depending on the parameters of the source. The results for undulator-based and conventional positron sources are compared and presented.
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