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 strength Spin Physics was once held in Bonn, 6-15 September 1990, with the Physikalisches Institut der Universitat Bonn because the host. The symposium used to be preceded through a chain of 4 workshops on • polarized electron resources and electron spin polarimeters • Siberian snakes and polarization in round machines • polarized fuel goals • polarized strong objectives. a hundred and sixty contributors from eleven nations, between them many younger physicists, got here jointly and mentioned normally technological spin difficulties. The excessive point of participation exhibits that workshops mixed with the symposium are beautiful not just for those who 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 contemporary effects have been provided and reviewed. therefore we are hoping those complaints might be useful to many researchers in those fields. The Organizing Committee wish to thank all individuals, particularly the audio system and the consultation chairmen, for his or her contributions to the workshops and for supporting to create a full of life and stimulating surroundings. detailed 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 operating those workshops. We gratefully recognize the enthusiastic support of the participants of our institute in getting ready and working the convention and the workshops, specially Mrs. D. FaSbender, Mrs. E. Wendorf, Mrs. J. Wetzel, and Dr. U.Idschok.

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The collector current leoll measured behind the retarding field plate as a function of the retarding voltage URAMP gives the integrated 'electron distribution curve' (EDC). The differential signal is obtained by adding a small modulation (15 m V peak-to-peak, frequency 1000Hz) to the cathode voltage Ueath and by detecting the variations of leoll with a lock-inamplifier. It was the idea of this experiment to verify the measurements of [3],[4] that measu~ed large energy broadenings (even more than IeV)of the beam already at currents in the range of some JlA, if the electron beam was generated by illuminating the cathode with a multimode laser.

5 mm thick Al window. , as far back as possible to take advantage of the energy dependent Compton opening angle to increase the size of the Compton spot at the detector. P. will be optimized to focus the backscattered photons on the detector. To better define the photon beam, collimators will be placed 16 m upstream from the detector, followed by sweeping magnets to help remove any secondary electrons which are produced. The Detector Kinematics. In the lab system, the initial electron energy is 30 GeV, the photon energy is 2,41 e V, and the collision is nearly head-on (the vertical crossing angle is 3 mrad).

O ~ ·e ~ +> +> oj u 00 N -s ...... O .... ~ t- r E 0 dJ Figure 2: Schematic picture of the Ml2S11er Polarimeter for MAMI 45 both target foil orientations Tl and T2 the "in-plane" magnetization pT will be equal. pB z pB y pB y pB '" 3 ATl + AT. 2a zz PT cosa ATl _ AT. 3 Performance Specifications A polarimeter of similar design, but scaled for the energy range between 25 and 180 MeV was already in operation and has been tested with the Mainz-Linac and with the low energy stage MAMI A. 01 within a measurement time of 6 sec or 4 min, respectively.

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