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- W137335087 abstract "Precise control of the rate at which the electron beam of a conventional weak-focusing sychrotron strikes a target internal to the sychrotron vacuum chamber is sometimes essential to the performance of a physical measuremeat. For example, the excitation and measurement of short half lives or neutron time of flight measurements demand a beam burst that is as short as possible, sometimes of the order of millimicroseconds. At the other extreme, coincidence measurements between nuclear fragments from the photodissociation of nuclei demand an extended beam burst of the order of milliseconds. In addition to these considerations, it is also desirable to be able to extract the electron beam from the sychrotron with as high a yield as possible. Toward these ends perturbation techniques have been developed and tested using the lowa State College 75-Mev sychrotron as a model. To obtain short beam bursts two methods have been employed, one using a half-integral resonance and the other using an integral resonance. The first method has the advantage of causing the electron beam to expand onto a target in approximately ten revolutions. Furthermore, this expansion is azimuthally dependent making the method also useful for beam extraction. The second method, while causing beam destructionmore » more slowly thsm the first (about 5 microseconds), is more applicable to activation experiments where precise control of the direction of the resulting Bremsstrahlung is desirable. Both methods utilize a magnetic deflection scheme. The usual method for obtaining protracted beam pulses by amplitude modulation of the synchrotron r- f system is not applicable to the lower energy machines since radiation losses are low. It is found, however, that frequency modulation of the r-f system at the peak of the magnetic guide field gives beam pulses of the order of two milliseconds duration. Thin is to be compared to a total acceleration time of six milliseconds. (auth)« less" @default.
- W137335087 created "2016-06-24" @default.
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- W137335087 date "1958-10-31" @default.
- W137335087 modified "2023-09-26" @default.
- W137335087 title "ELECTRON BEAM CONTROL IN A CONVENTIONAL SYNCHROTRON" @default.
- W137335087 hasPublicationYear "1958" @default.
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