New developments in atomic beam polarized ion sources at ETH-Zurich
The most powerful polarized ion sources presently in operation at particle accelerators are based on the ground state atomic beam scheme. The ionization of the polarized atoms is carried out by electron impact in order to produce positive hydrogen ions for injection in conventional cyclotrons. For the production of negative ions, which are particularly interesting for tandem accelerators and for use in high energy machines by application of charge exchange and multiturn injection, either a double charge exchange in a alkali vapour or the direct ionization of the atoms by a neutral Cs beam is used. In the last few years substantial progress on the performance of the electron impact ionizer and the double charge exchanger has been made in the authors' laboratory. A proton or deuteron beam intensity of over 100 ..mu..A has been observed in the positive stage of the source. A polarized negative ion intensity of 6 ..mu..A was obtained after the charge exchange. After acceleration in the ETH EN-tandem accelerator 2 to 3 ..mu..A of polarized deuterons with 90% polarization could be focussed through a 3 mm diameter collimator on a target. This is the highest value ever reported for an accelerated beam. At present the authors investigate improvements of the atomic beam stage. Presently available techniques suggest that it is possible to obtain 50 divided by 100 ..mu..A of polarized H/sup -/ and D/sup -/ ions with this type of source. The problems involved are discussed and new progress will be reported.
- Research Organization:
- Laboratorium fur Kernphysik Eidg. Technische Hochschule, CH-8093 Zurich
- OSTI ID:
- 5690459
- Journal Information:
- IEEE Trans. Nucl. Sci.; (United States), Journal Name: IEEE Trans. Nucl. Sci.; (United States) Vol. 30:2; ISSN IETNA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
430301* -- Particle Accelerators-- Ion Sources
ACCELERATORS
ALKALI METALS
ATOM COLLISIONS
ATOMIC BEAM SOURCES
ATOMIC BEAMS
BEAM CURRENTS
BEAM INJECTION
BEAMS
CESIUM
CHARGED PARTICLES
COLLIMATORS
COLLISIONS
CURRENTS
CYCLIC ACCELERATORS
CYCLOTRONS
DEUTERIUM IONS
DEUTERON BEAMS
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY LEVELS
EUROPE
FERMIONS
FLUIDS
GASES
GROUND STATES
HYDROGEN IONS
ION BEAM INJECTION
ION BEAM TARGETS
ION BEAMS
ION COLLISIONS
ION SOURCES
ION-ATOM COLLISIONS
IONIZATION
IONS
LEPTONS
METALS
NEUTRAL BEAM SOURCES
NUCLEON BEAMS
PARTICLE BEAMS
POLARIZATION
POLARIZED BEAMS
PROTON BEAMS
SWITZERLAND
TARGETS
VAPORS
WESTERN EUROPE