Chamber bottom for a plasma thruster
Chamber bottom for a plasma thruster making it possible to combine several functions in a single piece and, in particular, to fasten certain insulating parts of the plasma thruster, the chamber bottom having, in a single piece, a chamber bottom surface for closing an annular chamber formed by the chamber bottom and at least one insulating part attached to the chamber bottom, and at least a first set of tabs including fastening tabs for fastening the at least one insulating part to the chamber bottom.
1. A plasma thruster having a chamber bottom, the chamber bottom comprising, in a single piece, a chamber bottom surface for closing an annular chamber formed by the chamber bottom and delimited by at least one insulating part attached to the chamber bottom, and
at least a first set of tabs comprising fastening tabs for fastening by elastic fitting said at least one insulating part to the chamber bottom, wherein the chamber bottom is made of a metallic material, and wherein at least one fastening tab among the fastening tabs extends axially, beyond the chamber bottom surface in a downstream direction, is elastically deformable and has at its distal end a protrusion configured to cooperate with a notch, a groove or a shoulder of the at least one insulating part; and
a second set of tabs.
2. The plasma thruster according to claim 1 , wherein the chamber bottom is produced by additive manufacturing.
3. The plasma thruster according to claim 1 , wherein the chamber bottom surface has in section a generally U-shaped profile, having at least one point of inflection.
4. The plasma thruster according claim 1 , wherein the at least one insulating part comprises a first insulating part and a second insulating part, wherein the first set of tabs is an inner set of tabs, for fastening the first insulating part to the chamber bottom, the second set of tabs are an outer set of tabs, comprising additional fastening tabs for fastening the second insulating part to the chamber bottom.
5. The plasma thruster according claim 1 , wherein at least one set of tabs comprises dummy tabs configured so as not to cooperate with said at least one insulating part.
6. The plasma thruster according to claim 1 , further comprising at least one distribution cavity communicating with the chamber via injection orifices opening onto the chamber bottom surface.
7. The plasma thruster according to claim 1 , comprising a first distribution cavity communicating with a second distribution cavity via a first series of injection orifices, the second distribution cavity communicating with the chamber via a second series of injection orifices.
8. The plasma thruster according to claim 1 , wherein the at least one insulating part comprises a first inner insulating ring attached to the chamber bottom by engaging an inner surface of the first inner insulating ring around the first set of tabs.
9. The plasma thruster according to claim 8 , wherein the inner surface of the first inner insulating ring is provided with a circular groove, the protrusions of the fastening tabs of the first set of tabs being engaged in the circular groove of the first inner insulating ring and so as to lock a position of the first inner insulating ring.