High Energy Spin Physics: Volume 2: Workshops by J. E. Clendenin (auth.), Priv. Doz. Dr. Werner Meyer, Priv.

By J. E. Clendenin (auth.), Priv. Doz. Dr. Werner Meyer, Priv. Doz. Dr. Erhard Steffens, Dr. Werner Thiel (eds.)

The ninth foreign Symposium on excessive power Spin Physics used to be held in Bonn, 6-15 September 1990, with the Physikalisches Institut der Universitat Bonn because the host. The symposium was once preceded by way of a chain of 4 workshops on • polarized electron assets and electron spin polarimeters • Siberian snakes and polarization in round machines • polarized gasoline ambitions • polarized sturdy goals. one hundred sixty members from eleven international locations, between them many younger physicists, got here jointly and mentioned customarily technological spin difficulties. The excessive point of participation exhibits that workshops mixed with the symposium are appealing not just for those that plan and get ready polarized beams and ambitions but additionally for experimentalists and theorists facing excessive strength spin physics. At those workshops many very fascinating and demanding fresh effects have been provided and reviewed. therefore we are hoping those complaints should be helpful to many researchers in those fields. The Organizing Committee want to thank all individuals, particularly the audio system and the consultation chairmen, for his or her contributions to the workshops and for aiding to create a full of life and stimulating surroundings. precise thank you visit the organizers - W. Haeberli, S. Mango, E. Reichert, E. Steffens, W. Thiel, U. Wienands - for his or her cooperation in getting ready and working those workshops. We gratefully recognize the enthusiastic support of the participants of our institute in getting ready and working the convention and the workshops, specifically Mrs. D. FaSbender, Mrs. E. Wendorf, Mrs. J. Wetzel, and Dr. U.Idschok.

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Since the low transverse energy of this so called 'smooth optics' is achieved without using the conventional technique of resonant focusing, all parameters connected with electric and magnetic fields such as the final beam energy can be chosen independently from each other. The beam transport and acceleration system will soon be tested in a linear test bench using a thermoionic cathode, which will later be replaced by the GaAs cathode. The longitudinal temperature will be measured by an energy analyzer similar to the one used in the photocathode studies.

With realistic parameters (crossing angle, bunch currents) we expect a luminosity of about 5 Compton photons per 100 laser-bunch interactions. The laser is installed and is in operation. P. The total distance is 200 m, and so the beam must be transported in a partially evacuated channel. The system of monitors for alignment of the beam must be carefully designed to enable re-alignment of the beam inside the channel without access to the tunnel. P. The circular polarization of the laser light is generated by a Pockels cell in the West Hall, and must be preserved during its passage through the transport system.

Rv 675nm) corresponds to the AIGaAs layer behind the S1. 2(b) and 2(c), where the wave-length was changed by Ti:sapphire tunable laser whose available wave-length is limited to ). 2: 700A. ) were taken 10 days after the others(D) ,although no re-activation of NEA surface was done during two measurements. 2(b),the ESP seems to step up from the lower level of rv 30% to the higher level of rv 50% and this feature was well reproduced by several separate measurements, independent on the surface state which gave different quantum efficiencies.

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