Paper |
Title |
Other Keywords |
Page |
MOP36 |
Preliminary Study on HOM-Based Beam Alignment in the TESLA Test Facility
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dipole, alignment, gun, higher-order-mode |
117 |
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- N. Baboi, G. Kreps, M. Wendt
DESY, Hamburg
- G. Devanz, R. Paparella
CEA/DAPNIA-SACM, Gif-sur-Yvette Cedex
- O. Napoly
CEA/DSM/DAPNIA, Gif-sur-Yvette
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The interaction of the beam with the higher order modes (HOM) in the TESLA cavities has been studied in the past at the TESLA Test Facility (TTF) in order to determine whether the modes with the highest loss factor are sufficiently damped. The same modes can be used actively for beam alignment. At TTF the beam alignment based on the HOM signals is planned to be studied in the first cryo-module, containing 8 accelerating cavities. One of several modes with higher loss factor will be used. Its polarization has to be determined. The options to use single bunches or bunch trains will be analyzed. The results will be discussed in this paper.
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MOP39 |
Positron Transmission and Polarization in E-166 Experiment
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positron, target, photon, focusing |
126 |
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THP24 |
Highly Polarized Electrons from GaAs-GaAsP and InGaAs-AlGaAs Strained Layer Superlattice Photocathodes
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cathode, electron, photon, laser |
648 |
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- T. Nakanishi, F. Furuta, M. Kuwahara, K. Naniwa, T. Nishitani, S. Okumi, N. Yamamoto, K. Yasui
DOP Nagoya, Nagoya
- H. Horinaka, T. Matsuyama
OPU, Osaka
- H. Kobayakawa, Y. Takashima, Y. Takeda, O. Watanabe
DOE Nagoya, Nagoya-City
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GaAs-GaAsP strained layer superlattice photocathode has been developed for highly polarized electron beams. This cathode achieved a maximum polarization of 92% with a quantum efficiency of 0.5%. Criteria for achieving the highest polarization together with high quantum efficiency using superlattice photocathodes are discussed based on experimental spin-resolved quantum efficiency spectra of GaAs-AlGaAs, InGaAs-AlGaAs and GaAs-GaAsP superlattice structures.
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