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JJcceived by OSTl A fast beam chopper has been hnLit that can produce an arbitrary pulse program of the ?.00 MeV II" beam for synchronous Injection tnto moving rf bucketa In Cht ACS. The chopper will eliminate rC capture losses and can be used to tailor Che initial distribution in longitudinal phase space by varying the pulse parameters, width and phase, on a bunchby-bunch time scale, during multi-turn Injection. The chopper also serves as a studioa loul since Lu can provide controllable beam Intensity with fixed longitudinal emlttance (nnd conversely) uml/or missing buueheu. It LH 'in uleciroHLuL tc del Leel Lou device with 15 pairs of plates located above jml below the 35 keV H~ beam between the Ion source and the Itl'Q | > re Injector. The pLutuH ure «pm:»;il I'd mm apart in die bourn direction oml connected »u u nlowwave structure by coaxial cables. They are driven to * 760 V by dc-coupled JJUIHC guuurtitorv. lle.im current rtae and Hall times are ICHH tlwu 10 uu. * W o r k p t M T i i r n u u l 11IIII«• r (.lie / H I M | > 1I't'ii n f t i n * II* Department of Energy.

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In this nc'te the comparison has made between chosen set (1, 2, 4, 7) of chromaticity sextupoles and full set (I, 2, 3, 4, 5, 6, 7, 8) of sextupoles which would be ideal for Booster. Mathematical model representing Booster lattice is based on certain approximations for eddy current sextupoles and for chromaticity sextupoles.In this note we also evaluate how good are these approximations.

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