Annual report / Forschungszentrum Jülich Institut für Kernphysik. 1998
Annual report / Forschungszentrum Jülich Institut für Kernphysik. 1998
This jointly prepared report compiles the activities of the year past of our institute, our partners from CANU and other international collaborations at COSY as well as experiments of our scientists that have been carried out at other laboratories. Let me first mention a most notable event for our i...
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Personal Name(s): | Baur, G. (Editor) |
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Filges, D. (Editor) / Kilian, Kurt (Editor) / Maier, Rudolf (Editor) / Rossen, P. von (Editor) / Seyfarth, Hellmut (Editor) / Sistemich, K. (Editor) / Speth, J. (Editor) / Ströher, H. (Editor) / Freiesleben, H. (Editor) | |
Contributing Institute: |
Publikationen vor 2000; PRE-2000; Retrocat |
Imprint: |
Jülich
Forschungszentrum Jülich, Zentralbibliothek, Verlag
1999
|
Physical Description: |
255 p. |
Document Type: |
Report Book |
Research Program: |
Addenda |
Series Title: |
Berichte des Forschungszentrums Jülich
3640 |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
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520 | |a This jointly prepared report compiles the activities of the year past of our institute, our partners from CANU and other international collaborations at COSY as well as experiments of our scientists that have been carried out at other laboratories. Let me first mention a most notable event for our institute, the retirement of Professor O.W.B. Schult who had been in charge as director for the Institute of Experimental Nuclear Physics II for more than 25 years. With deep gratitude we remember his many contributionsand scientific visions which have helped the institute to obtain with COSY and ANKE new powerful research instruments. We are fortunate that he will be still at our institute which allows us to benefit also in the future from his distinguished experience. At the same time it is a great pleasure for me to welcome Professor Ströher, who seamlessly took over the now vacant position. His past activities had been centered at the University of Mainz doing research on electro- and photo-production of mesons and his name was closely connected with the installation and use of the TAPS spectrometer were he had been for three years the speaker for the international collaboration using this instrument. Fundamental work had been carried out with this spectrometer at the accelerators of GSI and MAMI. The research he is going to perform now at COSY, although different, is in many aspects complementary to his former field. He has taken over the responsibility for the scientific use of the new large spectrometer ANKE. The commissioning of this new instrument under his guidance, which was performed in three runs, has been very successful and first data is under analysis. Top priorities for the accelerator team were the commissioning of the internal spectrometer ANKE, the optimization of stochastic cooling, stochastic extraction and the acceleration of polarized protons. Reliability scores of COSY have been as good as in the year before and the percentage of beam time for experiments has been further extended. Beam stability problems induced by the new magnetic chicane of ANKE have all been solved and the accelerator has been verified to work up to the specified dellection angle of 10.6$^{\circ}$ of the spectrometer. Longitudinal stochastic cooling prolited tremendously by a new optical notch filter system wh ich has been routinely used lor the ongoing research program at COSY-11. The effectiveness of stochastic extraction at higher energies was successfully boosted to over 65%, a crucial requirement for the MOMO K$^{+}$K$^{-}$ low cross section measurement. We also succeeded to accelerate polarized protons up to the full energy of COSY conserving a high degree of polarization despite the crossing of several depolarizing resonances. First polarized beams were delivered to external experiments. The time of flight spectrometer TOF has been fully mended by replacing about 50% of the scintillators of the ring detector which had prematurely deteriorated. Through the addition of the barrel detector, built in Rossendorf, TOF can now be operated with three big hodoscopes and a distance between target and "quirl"-detector of 3.3 m. TOF was in December the first experiment to use extracted polarized protons for the investigation of bremsstrahlung. COSY-11 which made optimal use of stochastically cooled stored beam has been again very productive shedding light to the threshold production of $\eta$' and comparing the production of $\Lambda$ and $\Sigma^{\circ}$ at low energies. The GEM-collaboration succeeded in measuring for the first time p d $\rightarrow$ t $\pi^{+}$ and p d $\rightarrow$ He $\pi^{\circ}$ simulianeously over a large angular range at BIG KARL. | ||
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