What could be a radioactive ion beam facility at GANIL

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Status Report on GANIL

International audienceThe performance of GANIL are in constant progress and some special equipments are now installed which give a great operation flexibility. Moreover we now routinely accelerate ions from an external ECR source. We first report on these two aspects. Then we will shortly describe two of our main experimental equipments namely the 'SPEG' spectrometer and the ''LISE'' beam line both used in particular for exotic beam production and analysis. We will conclude, mentionning the funded GANIL improvements :'2.5' transformation and ''SME'' beam line

Direction for the Future - Successive Acceleration of Positive and Negative Ions Applied to Space Propulsion

Electrical space thrusters show important advantages for applications in outer space compared to chemical thrusters, as they allow a longer mission lifetime with lower weight and propellant consumption. Mature technologies on the market today accelerate positive ions to generate thrust. The ion beam is neutralized by electrons downstream, and this need for an additional neutralization system has some drawbacks related to stability, lifetime and total weight and power consumption. Many new concepts, to get rid of the neutralizer, have been proposed, and the PEGASES ion-ion thruster is one of them. This new thruster concept aims at accelerating both positive and negative ions to generate thrust, such that additional neutralization is redundant. This chapter gives an overview of the concept of electric propulsion and the state of the development of this new ion-ion thruster.Comment: 10 pages, contribution to the CAS-CERN Accelerator School: Ion Sources, Senec, Slovakia, 29 May - 8 June 2012, edited by R. Bailey. appears in CERN Yellow Report CERN-2013-007, pp.575-58

Collisionless heating in capacitive discharges enhanced by dual-frequency excitation

We discuss collisionless electron heating in capacitive discharges excited by a combination of two disparate frequencies. By developing an analytical model, we find, contrary to expectation, that the net heating in this case is much larger than the sum of the effects occurring when the two frequencies act separately. This prediction is substantiated by kinetic simulations, which are also in excellent general quantitative agreement with the model for discharge parameters that are typical of recent experiments

Limited energy spread in an SSC

http://accelconf.web.cern.ch/AccelConf/c78/papers/f-02.pd

Beam tuning and stabilization using beam phase measurement at GANIL

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Chromatic correlations at injection and related ejection problems in separated sector cyclotrons

International audienceInjection into a cyclotron, in order to preventemittance and phase spread dilution, requires propercouplings in the matching. One must first introduce aAP/r' associated with an r/AW coupling (through simplecticconditions) ; according to the angle of theaccelerating dees and the choice of harmonic numberthe(r,r') acceptance may also have to be tilted. Allthese effects are investigated in the case of theGANIL SSC's. At extraction corresponding correlationsexist. For a resonant system, extraction may be difficultwhen the energy spread is large because of thelarge coupling induced by resonance. A precessionalextraction which has been studied might in this casebe more efficient. Other ways for making extractioneasier are also considered. Moreover a new method ofphase compression at injection into the SSC is presentlyunder study at GANIL

CARTE: An Observation Station to Regulate Activity in a Learning Context

This chapter discusses the introduction of a new concept called "regulation" into a use model, which is part of a theoretical observation model called trace-based system (TBS). This concept defines a retroaction mechanism in an observation station. We present the results of experiments, in a learning context, with a prototype observation station called Collection, activity Analysis and Regulation based on Traces Enriched (CARTE)

Application to the SPIRAL project at GANIL of a new kind of large acceptance mass separator

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High intensity and space charge problems at GANIL

http://accelconf.web.cern.ch/AccelConf/c86/papers/g-04.pdfInternational audienceWe routinely accelerate up to micro-amperes of ionsat energies ranging from 25 to 95 MeV / A. Already atthese levels, space charge (S.C) problems drasticallyaffect the bunching efficiency between the ECRexternal ion-source and our Co compact injector.Moreover in the "2.5" version of GANIL we expectcurrents above 50 e\l A (Ar+6 for instance) and S.Ceffects will be of prime importance during accelerationin the injector and even in our first SSC. Wepresent our computer codes and our first results