Download 11th International Conference on High-Energy Accelerators: by J. B. Adams, M. Peter (auth.), W. S. Newman (eds.) PDF

By J. B. Adams, M. Peter (auth.), W. S. Newman (eds.)

The convention timetable needed to be so prepared as to unfold the most subject matters over a number of separate classes. It was once as a result made up our minds to post the cloth in those court cases less than 9 topic headings, regardless of consultation. inside of every one bankruptcy, that's preceded by way of an inventory of the classes that includes the topic, all papers, invited and contributed, no matter if provided on the convention or permitted for ebook in basic terms, were prepared in a few lo­ gical order. The stories of the 4 Panel Discussions have been edited or summarized by way of the respective Moderator in session with Panel individuals. in a single example, shortened models of the Introductory Papers precede the dialogue. the place attainable, verbatim debts of the customarily full of life exchanges were retained. The popular catalogue of high-energy acceler­ ators has been released individually. the ongoing world-wide actions in accelerator learn, witl1 its ever higher professional­ jects, are mirrored by means of the various contributions accredited for inclusion in those court cases, that have reached the restrict of what a unmarried quantity can manageably comprise, whereas making fast book even tougher to accomplish. all of the extra cause to increase the gratitude of all con­ cerned to these thinking about the chain of construction: - To the authors, for his or her suggested handing-in or well timed posting in their papers. thank you additionally to their secretaries who the information for the presentation of camera-ready copy.

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Additional resources for 11th International Conference on High-Energy Accelerators: Geneva, Switzerland, July 7–11, 1980

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The threshold current varies only a little with the chromaticity, When the instability occurs, we could never detect any coherent dipole signal from the beam. Also the feedback system did not change the behavior of the unstable beam. D. Kohaupt proposed a new explanation for this effect 9 ) 10 ). He described the instability as a head-tail turbulence driven by short range forces. - 19 From this theory a strong influence of the synchrotron frequency and of the bunch length on the maximum current was expected, Indeed, the maximum current was doubled by going to higher synchrotron frequencies during injection.

This will be sufficient to reach 18 GeV, in September. Injection will be at 15 GeV and so ramping will be done to reach top energy. G. PARZEN (Brookhaven): How well does your closed orbit operation system work? What orbit displacement do you start out with and what do you end up at? Is there a basic reason why you. cannot correct to better than a few millimetres? M. PATERSON: We did not get circulating beam without correctors. Initially many corrections were required until we found an error that made the lattice symmetric.

This points to t~o other mechanisms for I residual [mAl I bI satellite resonance excitation: By transversal fields in the cavities 12 ) and by dispersion in the cavities 13 ). Both effects may be present in PETRA 2 ). By carefully adjusting orbit and dispersion bumps the satellite resonances can be compensated (Fig. 3). This compensation is very sensitive, as the ~idth of the peak in residual current corresponds to 1 mm beam movement only. The resonance strength decreases ~ith increasing energy, but even at 17 GeV the second satellite -- -1------+--r--------AX= 1 mm AD = 10 em orbit displacement change of dtspefSion Fig.

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