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.
Multi-MeV accelerator system for ion implantation
Ion implantation makes possible dramatic improvements in the surface properties of metals. For many applications the required penetration depth is several m, corresponding to an ion beam energy of several MeV. This paper describes the design of a compact, efficient accelerator system for such applications. The system is based on a MEVVA ion source and a high gradient rf quadrupole design.