Development of a variable energy RFQ for cluster acceleration
An RFQ (radio-frequency quadrupole) has been designed and built as a postaccelerator for the cluster accelerator facility at the IPN (Institute de Physique Nucleaire) Lyon, France. The four-rod RFQ resonator is designed for variable energy by means of a variable frequency of the resonator between 80 and 110 MHz. The properties of the RFQ for the typical cluster mass ranges of up to 50 u are discussed and the status of the project is reported.<<ETX>>
PROGRESS IN NORMAL CONDUCTING
Two Heavy Ion RFQsl-3 have been built for the UNILAC at GSI, a new high charge state injector (~I) and a prototype of a new high current injector (HSI). Both can be seen as branches of actual RFQ development. The HLI-FQ aeeelerates U28+ions from an ECR-ion source from 2.5 keV/u to 300 keV/u with a high duty cycle of now 25% at an operating frequency of 108.5 MHz. The Spiral-RFQ for the HSI accelerator accepts low energy (2.2 keV/u). high current (25 rnA) beams with low charge states (U2+,Xe+) at an operating frequency of2? MHz. Results of structure development and beam experiments for both structures are discussed which can be seen as model for the first crucial part of a RFQ for low charged radioactive beams concerning low frequency operation, high duty factor and beam dynamics properties.
PULSE: a high-repetition-rate linac driver for x-ray FELs
We describe a staged concept for a linac-based freeelectron laser providing coherent tuneable VUV and soft X-ray output with pulse lengths down to 10 fs or less. Use of 1.3 GHz cryomodules operated with CW RF will allow flexible pulse patterns at potentially very high repetition rates up to 1 MHz. We consider the options for FELs that may be included in a facility of this type.