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Rezultaty
The development of a model describing the phenomena taking place in the extraction system has been undertaken. The importance of the spatial distribution of the ions in the azimuthal dimension (influence of the hexapole) has been demonstrated. Any electrostatic field component perpendicular to the longitudinal direction of the magnetic field may cause emittance growth. Electrons with arbitrary energy can now be used in the simulation to compensate the positive space charge of the ions close to the plasma boundary as an extension of Self's model. The thickness of the resulting plasma boundary will increase if electrons with energies in the order of several 10eV to several 100eV are present.
For thermal evaporation, a miniature oven had been developed at GSI for temperatures between 600 °C and 1500 °C. To extend the temperature limit of 1500 °C, a new type of high temperature oven was developed for an operating temperature of up to 2000 °C that has the same geometrical dimensions as the standard miniature oven.
The GTS source is a 10-29 GHz source, providing a high confinement at 18 GHz. It delivers intense beams of high charges It has been tested to produce cw beams of oxygen, argon, xenon, tantalum and bismuth. It delivers both high currents and high charges
The wave-guide line for the coupling of the HF power of the gyrotron to the ECRIS is made of:
- Mode filter
- Arc detector
- Incident and reflected power measuring detectors
- Mode converter
- Bend, if necessary
- HF window
Such a line was tested at the SERSE source (long length) and at the PHOENIX source (short length)
The Phoenix source has been developed according to the following objectives: injection of 10 kW HF power, 28 GHz operation in pulsed mode, 1 emA extraction of Pb27+. For that purpose 60 kV biasing of the source is necessary. The source has been installed at ISN and has been tested for Xe20+ production and Pb27+ production. From that source large currents of lower charges of light ions (nitrogen) have also been produced.
A demonstration experimental set-up of an autonomous cryocooler at 4K has been tested. This cryocooler uses a pulse tube technology. Today .5 W at 4.2 K are available. We expect in a near future to reach 1 W. PT cryocoolers are very promising for the future, because of their reliability.
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