NSCL/MSU ECR离子源项目进展报告(英文)

Since the last ECR Workshop,NSCL/MSU has been involved in a vigorous ECR ion source R&D program,which resulted in the construction of an off-line test ECR ion source(ARTEMIS-B)for new beam development and ion optics studies.Also the design and partial completion of a 3rd generation,fully supercon- ducting ECR ion source,SuSI has been accomplished.This paper is an overview of the construction projects and the different R&D activities performed with the existing ion sources.These activities include development of metallic ion beam production methods using evaporation with resistive and inductive ovens and sputtering of very refractory metals.Ion optics developments include testing different focusing elements(magnetic solenoid lens,electrostatic quadrupole triplet lens,Einzel lens,electrostatic double doublet quadrupole combined with an octupole lens),and different beam forming and diagnostics devices.The detailed results will be presented at the workshop in separate talks and posters.

NSCL从ECR离子源向CCF注入的离子束流动力学研究(英文)

The Coupled Cyclotron Facility (CCF) has been operating at the NSCL since 2001,providing up to 160MeV/u heavy ion beams for nuclear physics experiments.Recent steps,particularly the improvement of the ECR-to-K500 injection line,were taken to improve the CCF performance.For that purpose an off-line ECR source,ARTEMIS-B,was built and used to investigate the impact on beam brightness under various source operating conditions,different initial focusing systems and current analysis dipole.Beam dynamics simulations including space-charge and 3D electrostatic field effects were performed and beam diagnostics including emittance scanner were used,leading to a better understanding of the CCF beam injection process. New initial electrostatic focusing elements such as a large-bore quadrupole triplet and a quadrupole double- doublet with compensating octupole were tested,and a new beam tuning procedure was established to improve the beam brightness for the CCF.Following these efforts,a significant increase of primary beam power out of the CCF has been achieved.

NSCL的离线ECR离子源ARTEMIS-B的研究与发展(英文)

This paper reviews recent experimental work done with the off line source ARTEMIS-B at the NSCL.This source was built during the year 2005 and provides opportunities for off line development that can benefit the Coupled Cyclotron Facility(CCF)operation while minimizing the time taken away from the nuclear experimental program.The Artemis-B setup includes many beam diagnostics and a detailed description of the emittance scanner(Allison)and emittance measurement method is presented.A first beam dynamics study indicates that the analysis magnet has strong field aberrations and that the beam size in the dipole must be small in order to avoid significant beam brightness degradation.A second study compares beam brightness for different focusing systems between the ECR ion source and the analyzing magnet.Two electrostatic devices:a quadrupole triplet and a double quadrupole doublet have been tested successively and compared to a magnetic focusing solenoid.The experimental results tend to indicate a better beam brightness at smaller emittance for the electrostatic devices,although emittances measured for each focusing element were for a large part dependant on the tuning procedure developed to minimize the effects of the analyzing magnet.