Processing system having magnet keeper
View Patent ↗A processing system for and a method of producing ions inside a process chamber and shielding the ions from a magnetic field by directing the magnetic field through a magnet keeper is described.
1. A processing system, comprising:
a process chamber;
a diffuser magnet that is disposed outside the process chamber;
a diffuser magnetic plate disposed within the process chamber between an interior of the process chamber and the diffuser magnet, the diffuser magnetic plate being physically separate from the diffuser magnet;
a magnet field keeper partially enclosing the diffuser magnet; and
a cover partially enclosing the magnet field keeper and
the processing system further comprising:
a first anode band comprising: a first inner wall; a first outer wall offset from the first inner wall by a thickness; and a plurality of perforations formed through the first anode band; and
a second anode band surrounding the first anode band, the second anode band comprising a second inner wall offset from the first outer wall by a gap.
2. The processing system of claim 1 , wherein the diffuser magnet is a permanent magnet.
3. The processing system of claim 2 , wherein the diffuser magnet is formed from a material selected from the group consisting of neodymium-iron-boron alloys, samarium-cobalt alloys, ceramics, hard ferrites, and aluminum-nickel-cobalt alloys.
4. The processing system of claim 2 , wherein the diffuser magnet is formed from a material comprising Ceramic 8.
5. The processing system of claim 2 , wherein the diffuser magnet has a maximum energy product less than or equal to 40 MGOe.
6. The processing system of claim 1 , wherein the diffuser magnet has an effective diameter in a range of 0.2 to 1.0 inches.
7. The processing system of claim 1 , wherein the diffuser magnet has a length in a range of 0.3 to 1.0 inches.
8. The processing system of claim 1 , wherein the diffuser magnetic plate is formed from a soft magnetic material.
9. The processing system of claim 8 , wherein the diffuser magnetic plate is formed from a material selected from the group consisting of steels, electrical steels, iron-nickel alloys, iron-cobalt alloys, ferrites, and amorphous metals.
10. The processing system of claim 8 , wherein the diffuser magnetic plate is formed from a material comprising a relative permeability greater than or equal to the relative permeability of grade 410 stainless steel.
11. The processing system of claim 1 , wherein the diffuser magnetic plate has a thickness in a range of 0.2 to 0.5 inches.
12. The processing system of claim 11 , wherein the diffuser magnetic plate has a thickness of 0.35 inches.
13. The processing system of claim 1 , wherein the magnet field keeper is formed from a soft magnetic material.
14. The processing system of claim 13 , wherein the magnet keeper is formed from a material selected from the group consisting of steels, electrical steels, iron-nickel alloys, iron-cobalt alloys, ferrites, and amorphous metals.
15. The processing system of claim 13 , wherein the magnet field keeper is formed from a material comprising a relative permeability greater than or equal to the relative permeability of grade 410 stainless steel.
16. The processing system of claim 1 , wherein the diffuser magnet is disposed a distance from the diffuser magnetic plate in a range of 0.53 to 0.75 inches.
17. The processing system of claim 1 , wherein the gap is in a range of 0.06 to 0.19 inches.
18. The processing system of claim 1 , wherein the processing system is a plasma enhanced chemical vapor deposition system.