Using a Pulsed Deflector for Extraction of Pulsed Beams from the Triumf Cyclotron
نویسنده
چکیده
In the normal mode of operation, the TRIUMF cyclotron accelerates H ions to produce 500 MeV proton beams of 160 A with 4 nsec pulses separated by 43 nsec. A proposed experiment ( ! e conversion) requires a 500 MeV beam with 100-200 nsec pulses separated by 1-2 sec with an average intensity of 200 A. Two methods have been investigated to achieve this time structure. Both incorporate a pulsed electric deflector and take advantage of extraction by stripping. In the first case, a deflector with a thin septum deflects radially up to six accumulated turns onto a stripping foil in one turn. In the second, a pair of vertically deflecting plates are pulsed at a frequency to excite a coherent vertical growth, and the particles are eventually intercepted by a stripping foil. Under certain conditions extraction occurs in almost perfect synchronism with the driving pulse. Both methods will be described in detail and results of computer simulations will be presented.
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