DRAGON summer research report: differential pumping system
Constraints on the differential pumping system of the DRAGON are discussed, as are the weak- nesses in the current design. An attempt is made to improve the system, so as to allow for a 30 mrad acceptance half-angle with a 4 mm beam spot size, and the production of recoils up to 1 cm upstream from the target center. Three new designs are presented. The new systems use either the same number of pumps as the exising one or require the purchase of 1-2 new turbo pumps. The new pumping systems are around 45 cm shorter than the existing one; this extra space could be used to incorporate another magnetic quadrupole doublet or a post-stripper gas cell into the DRAGON.
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