Program BB for calculation of PEP corrector strengths for beam-bump excitation
Excitation of a beam-bump (BB) can be effectively used for a number of goals. Since BB is sensitive only to perturbations of elements which are located inside it, errors and their consequencies spaced separately can be singled out and studied one by one. This technique in principle can be used to study the uniformity of the quadrupole distribution around the ring, the beam stays clear size of the machine at different locations, the polarity and probably even the strength of sextupole magnets, alignments of different monitors, etc. It can be used also to increase the beam cross section if that appears to be desirable. Design of PEP correctors does not allow to use them for excitation of a halfwave BB. The minimum number of correctors which can be used in this situation is three. The situation for horizontal plane is aggravated still more since most of horizontal correctors are hooked in pairs. The presence of sextupole magnets interlacing the correctors makes it necessary to use iterative procedure to find the corrector strengths for BB, since a perturbed orbit is influenced by a field of a sextupole magnet which in turn depends on the perturbed orbit value in the sextupole. Since the strength of sextupoles are rather small as the first guess of corrector strengths for iterative procedure can be taken the linear solution neglecting sextupoles. This paper describes the program BB itself, and some results of calculations with BB for PEP. 3 refs., 4 figs., 6 tabs.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- DOE Contract Number:
- AC03-76SF00515
- OSTI ID:
- 6401632
- Report Number(s):
- SLAC-PEP-NOTE-360; ON: DE89006264
- Resource Relation:
- Other Information: Paper copy only, copy does not permit microfiche production
- Country of Publication:
- United States
- Language:
- English
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