A Coupled RFQ-Drift Tube Combination for FRANZ

The Frankfurt Neutron Source at the Stern-GerlachZentrum (FRANZ) [1] will comprise a short 175 MHz linac sequence consisting of a 1.75 m long 700 keV 4-rod type RFQ [2] followed by a 60 cm IH-DTL [3] for proton acceleration up to 2 MeV. The beam current is 200 mA at pulsed and up to 30 mA at c.w. operation. The aim is to have a very compact device driven by only one rfamplifier to reduce costs and required installation space. A strong coupling between the RFQ and the IH resonators will be realized by a direct connection between the last stems of each resonator through the common end wall. The accelerators could also be driven separately by just removing the coupling. The distance between the end of the RFQ electrodes and the midplane of the first DTL gap is only 5 cm leaving some place for a x-y-steerer. Preliminary rf-simulations have been carried out together with accompanying measurements on rf-models.

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