Controllability on infinite-dimensional manifolds

Following the unified approach of A. Kriegl and P.W. Michor (1997) for a treatment of global analysis on a class of locally convex spaces known as convenient, we give a generalization of Rashevsky-Chow's theorem for control systems in regular connected manifolds modelled on convenient (infinite-dimensional) locally convex spaces which are not necessarily normable.Comment: 19 pages, 1 figur

SURFACE PLASMA SOURCE OF HYDROGEN ATOMS WITH AN ENERGY OF HUNDREDS eV

No abstract availabl

NEGATIVE ION PRODUCTION IN SURFACE-PLASMA SOURCES WITH UNCLOSED ELECTRON DRIFT DISCHARGES

No abstract availabl

Highly Polarized Ion Sources for Electron Ion Colliders (EIC)

The operation of the RHIC facility at BNL and the Electron Ion Colliders (EIC) under development at Jefferson Laboratory and BNL need high brightness ion beams with the highest polarization. Charge exchange injection into a storage ring or synchrotron and Siberian snakes have the potential to handle the needed polarized beam currents, but first the ion sources must create beams with the highest possible polarization to maximize collider productivity, which is proportional to a high power of the polarization. We are developing one universal H-/D- ion source design which will synthesize the most advanced developments in the field of polarized ion sources to provide high current, high brightness, ion beams with greater than 90% polarization, good lifetime, high reliability, and good power efficiency. The new source will be an advanced version of an atomic beam polarized ion source (ABPIS) with resonant charge exchange ionization by negative ions. An integrated ABPIS design will be prepared based on new materials and an optimized magnetic focusing system. Polarized atomic and ion beam formation, extraction, and transport for the new source will be computer simulated

Negative ion surface-plasma source development for fusion in Novosibirsk

This paper is a review of research effected on negative ion plasma-surface sources in the Institute of Nuclear Physics in Novosibirsk. It contains the description of the performances of the planatron, a source which produced in 1972 in pure hydrogen a density of H- ion current of 0.75 A/cm2. The results of recent studies of this source, in the 1987 version, designated as semi-planatron, are also presented. The experiments effected by adding cesium to the hydrogen discharge lead to a theoretical model of the surface-plasma sources with low work function cathode. The optimization of the negative ion production led to the increase of the beam intensity to 11 A.Cet article présente une synthèse des travaux effectués à l'Institut de Physique Nucléaire de Novosibirsk sur les sources plasma-surface d'ions négatifs. Il contient la description des performances du planatron, une source qui a produit en 1972 une densité de courant d'ions H- de 0,75 A/cm2 en hydrogène pur. Les résultats des études de cette source dans sa version 1987, désignée semi-planatron, sont aussi présentés. Les expériences effectuées en ajoutant du césium à la décharge d'hydrogène ont conduit à l'élaboration d'un modèle théorique des sources plasma-surface à cathode à faible travail de sortie. L'optimisation de la production des ions négatifs a permis d'augmenter l'intensité du faisceau à 11 A

SNS Laser Stripping for H- Injection

The ORNL spallation neutron source (SNS) user facility requires a reliable, intense beams of protons. The technique of H<sup>-</sup> charge exchange injection into a storage ring or synchrotron has the potential to provide the needed beam currents, but it will be limited by intrinsic limitations of carbon and diamond stripping foils. A laser in combination with magnetic stripping has been used to demonstrate a new technique for high intensity proton injection, but several problems need to be solved before a practical system can be realized. Technology developed for use in Free Electron Lasers is being used to address the remaining challenges to practical implementation of laser controlled H<sup>-</sup> charge exchange injection for the SNS. These technical challenges include (1) operation in vacuum, (2) the control of the UV laser beam to synchronize with the H<sup>-</sup> beam and to shape the proton beam, (3) the control and stabilization of the Fabry-Perot resonator, and (4) protection of the mirrors from radiation