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 hence determined to submit the fabric in those lawsuits lower than 9 topic headings, without reference to consultation. inside every one bankruptcy, that is preceded through a listing of the periods that includes the topic, all papers, invited and contributed, even if offered on the convention or accredited for booklet purely, were prepared in a few lo­ gical order. The stories of the 4 Panel Discussions have been edited or summarized through the respective Moderator in session with Panel contributors. in a single example, shortened models of the Introductory Papers precede the dialogue. the place attainable, verbatim bills of the usually full of life exchanges were retained. The conventional catalogue of high-energy acceler­ ators has been released individually. the ongoing world-wide actions in accelerator examine, witl1 its ever higher professional­ jects, are mirrored via the varied contributions authorised for inclusion in those lawsuits, that have reached the restrict of what a unmarried quantity can manageably comprise, whereas making speedy e-book even more durable to accomplish. all of the extra cause to increase the gratitude of all con­ cerned to these fascinated by the chain of creation: - 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 ideas 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

Example text

At high currents and equally filled bunches both beams 3,0 ~ Cizo 0 0 2,0 rei. 0 10 t [ ms) Fig. 6: Vertical beam size after collision as a function of time during the first milliseconds after collision. 2...!. (j Gzo "I rel. beam height 2 x 1,2 mA 7 &eV one against one bunch saparatioa voltage switched o J f f• ~ )l~ll: 3,0 . 6 0 I (sec] are growing rapidly Fig. 7: Vertical beam size after collision as a function at the beginning, of time for the stronger and the weaker beam. but one is a bit stronger and at the end this beam is within 2-3 damping constants down to near the initial value, During this time the other beam blows up further.

At the same time the focusing is changed from the injection optic with rather ''smooth" amplitude functions to the luminosity optic with the small S's at the interaction points. During this procedure the tune of the machine must be kept very constant since otherwise the beam will be lost due to resonances, This is done by an automatic tune controller developed for PETRA 4 ). It excites the beam to small betatron and synchrotron oscillations and measures the oscillation frequencies by phase locked loop circuits.

Two machine parameters are influencing the threshold of the vertical instability: (i) It increases at least linearly with the injection energy in the range from 5 to 7 GeV. (ii) It increases with decreasing amplitude function in the rf cavities. 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 ).

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