Device for conducting away lost heat, as well as ion accelerator arrangement having such a device
The invention relates to an ion accelerator arrangement comprising an ionization chamber which is surrounded by a chamber wall and a magnetic arrangement that is disposed outside the chamber wall. Steps are taken to dissipate lost heat occurring on the chamber wall, and advantageous solutions are provided to protect permanent-magnet elements of the magnetic arrangement.
1. Ion accelerator arrangement having a device for conducting away lost heat, having an ionization chamber, and a magnet arrangement that surrounds the ionization chamber, as well as having a heat conduction body for dissipating lost heat that occurs at the chamber wall, whereby the heat conduction body is heat-conductively and mechanically firmly connected with the magnet arrangement, and possesses at least one of a greater heat conductivity and a lower specific weight in comparison with the magnet arrangement, wherein the heat conduction body comprises at least predominantly an aluminum-silicon alloy having a hypereutectic proportion of silicon, or wherein a heat radiation reflector device is disposed at least between a part of the surfaces of the magnet arrangement that face the chamber wall and are spaced apart from the chamber wall.
2. Arrangement according to claim 1 , wherein the proportion of silicon amounts to at least 30%.
3. Arrangement according to claim 1 , wherein the proportion of silicon amounts to at most 60%.
4. Arrangement according to claim 1 , wherein the heat conduction body surrounds the magnet arrangement and is radially braced relative to the magnet arrangement.
5. Arrangement according to claim 4 , wherein the heat conduction body is shrunk onto the magnet arrangement.
6. Arrangement according to claim 1 , wherein the material of the magnet arrangement possesses a heat expansion coefficient between 8×10 −5 /K and 16×10 −5 /K.
7. Arrangement according to claim 1 , wherein the magnet arrangement contains multiple permanent magnet rings that surround the ionization chamber, which are spaced apart from one another in a longitudinal direction of the ionization chamber.
8. Arrangement according to claim 7 , wherein permanent magnet rings that are adjacent in the longitudinal direction of the ionization chamber have polings oriented in opposite directions.
9. Arrangement according to claim 7 , wherein pole shoe rings made of soft-magnetic material are inserted between permanent magnet rings that are adjacent in the longitudinal direction.
10. Arrangement according to claim 1 , wherein the heat conduction body is coupled with a radiator arrangement that gives off heat to the surroundings, by means of radiation.
11. Arrangement according to claim 1 , wherein the heat radiation reflector device is present on surfaces of permanent magnet materials.
12. Arrangement according to claim 1 , wherein the heat radiation reflector device is interrupted at pole shoes, in longitudinal sections.
13. Arrangement according to claim 1 , wherein the heat radiation device is formed by a reflective coating on the magnet arrangement.
14. Arrangement according to claim 1 , wherein the arrangement is placed in a spacecraft.