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The Amsterdam Pulse Stretcher

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7 Author(s)
Maas, R. ; NIKHEF-K P.O. Box 4395, 1009 AJ Amsterdam, The Netherlands ; Bruinsma, P.J.T. ; Kroes, F.B. ; Luijckx, G.
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In order to increase the duty factor (d.f.) of the present 500 MeV electron linac from 2.5 % to > 90 %, it is proposed to add a pulse stretcher to the facility. By replacing 4 of the 12 existing 4 MW klystrons by 25 MW types, the injection energy will be increased to E = 700 MeV. A peak current of 40 mA will be injected during three turns with 365 pps. to yield an extracted beam current of 40 ¿A. The machine operates near a third order resonance. The chromaticity is non-zero. Extraction proceeds by changing the cavity frequency (2856 MHz); this will push the beam into the unstable region of the phase space. An energy compressor will reduce the momentum spread of the injected beam to ¿dp/p¿ = 0.1 %.

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Nuclear Science, IEEE Transactions on  (Volume:32 ,  Issue: 5 )