Institut de recherche sur les lois fondamentales de l'Univers

Direction de la recherche fondamentale

Résumé du preprint DAPNIA/SEA/99-42

SEA/99-42
Status and new developments of high intensity ECR source SILHI, CW and pulsed mode
J-M. Lagniel, P-Y. Beauvais, D. Bogard, G. Bourdelle, G. Charruau, O. Delferrière, D. De Menezes, A. France, R. Ferdinand, Y. Gauthier, R. Gobin, F. Harrault, J-L. Jannin, P-A. Leroy, I. Yao, Commissariat à l'Energie Atomique, CEA-Saclay, DSM/DAPNIA/SEA 91191 Gif sur Yvette Cedex, France P. Ausset, B. Pottin, N. Rouvière, Centre National de la Recherche Scientifique, IN2P3, IPN, 91 405 Orsay Cedex, France, L. Celona, S. Gammino, Istituto Nazionale di Fisica Nucleare, LNS, Via S. Sofia 44, 95 123 Catania, Italy
SILHI is the ECR Source of Light Ions for High Intensity beams constructed and tested at CEA-Saclay. The first aim is to produce up to 100 mA cw proton beams at 95 keV for IPHI, the Injector of Protons for High Intensity beams (5 MeV RFQ and 10 MeV DTL). This prototype is developed by a CEA � CNRS-IN2P3 collaboration for applications such as Accelerator Driven Systems for nuclear waste transmutation, production of radioactive ion beams or secondary particles. SILHI is also used to study the production of deuteron and H- beams for the IFMIF and ESS projects respectively. The present status of SILHI and the experiments planned for the near future in both cw and pulsed modes are presented in this paper. 80 mA cw proton beams are now currently produced at 95 keV with a high availability (~1 spark per day). The proton fraction is around 90 % and the typical r-r� rms normalized emittance after transport through a single solenoid LEBT without beam losses is 0.3  mm.mrad. The best beam characteristics are obtained when an ECR zone is created at the frontier between the plasma chamber and the RF ridged transition. Extensive emittance measurements performed with different gas injection in the LEBT have shown a factor 3 emittance reduction. Space charge compensation measurements in cw mode will be undertaken with a four-grid analyzer to understand this behavior. Time resolved space charge compensation measurements in pulsed mode are also discussed. The highest total beam current of 120 mA (240 mA/cm2) can be extracted with two ECR zones located at the plasma chamber extremities. Nevertheless a new electrode design must be done for this configuration to avoid excessive beam losses in the extraction system.

SEA/99-42

Status and new developments of high intensity ECR source SILHI, CW and pulsed mode

J-M. Lagniel, P-Y. Beauvais, D. Bogard, G. Bourdelle, G. Charruau, O. Delferrière, D. De Menezes, A. France, R. Ferdinand, Y. Gauthier, R. Gobin, F. Harrault, J-L. Jannin, P-A. Leroy, I. Yao, Commissariat à l'Energie Atomique, CEA-Saclay, DSM/DAPNIA/SEA 91191 Gif sur Yvette Cedex, France P. Ausset, B. Pottin, N. Rouvière, Centre National de la Recherche Scientifique, IN2P3, IPN, 91 405 Orsay Cedex, France, L. Celona, S. Gammino, Istituto Nazionale di Fisica Nucleare, LNS, Via S. Sofia 44, 95 123 Catania, Italy

SILHI is the ECR Source of Light Ions for High Intensity beams constructed and tested at CEA-Saclay. The first aim is to produce up to 100 mA cw proton beams at 95 keV for IPHI, the Injector of Protons for High Intensity beams (5 MeV RFQ and 10 MeV DTL). This prototype is developed by a CEA � CNRS-IN2P3 collaboration for applications such as Accelerator Driven Systems for nuclear waste transmutation, production of radioactive ion beams or secondary particles. SILHI is also used to study the production of deuteron and H- beams for the IFMIF and ESS projects respectively. The present status of SILHI and the experiments planned for the near future in both cw and pulsed modes are presented in this paper. 80 mA cw proton beams are now currently produced at 95 keV with a high availability (~1 spark per day). The proton fraction is around 90 % and the typical r-r� rms normalized emittance after transport through a single solenoid LEBT without beam losses is 0.3  mm.mrad. The best beam characteristics are obtained when an ECR zone is created at the frontier between the plasma chamber and the RF ridged transition. Extensive emittance measurements performed with different gas injection in the LEBT have shown a factor 3 emittance reduction. Space charge compensation measurements in cw mode will be undertaken with a four-grid analyzer to understand this behavior. Time resolved space charge compensation measurements in pulsed mode are also discussed. The highest total beam current of 120 mA (240 mA/cm2) can be extracted with two ECR zones located at the plasma chamber extremities. Nevertheless a new electrode design must be done for this configuration to avoid excessive beam losses in the extraction system.