Patent ID: 7485204

Claim:
An ECR plasma source comprising: a microwave source; a microwave introducing means connected to the microwave source; a microwave transmitting means connected to the microwave introducing means; a plasma generating chamber connected to the microwave transmitting means; and at least one magnetic generation means having magnetic coils wound around the plasma generating chamber for generating the electron cyclotron resonance (ECR) plasma and a plasma flow drawn from an opening of the plasma generating chamber, wherein, the plasma generating chamber has generally rectangular sectional shapes, the magnetic coils of the magnetic generation means are wound in generally rectangular shapes normal to the direction of the plasma flow, the microwave introducing means includes a straight shape microwave cavity resonator which is terminated on one end portion of the straight shape microwave cavity resonator with a metal plate to form a terminal end portion having no opening, the other end portion of the straight shape microwave cavity resonator having a first opening formed by inserting a metal plate slit into the other end portion, the end portion having the first opening is connected to the microwave source through a part of the microwave introducing means, the straight shape microwave cavity resonator has a terminal end portion having no opening and an end portion having the first opening disposed at a distance of n×(λg/2) (n: an integer of 3 or more, λg: guide wavelength) from the terminal end portion, and in the straight shape microwave cavity resonator, first resonance units having a length λg/2, but not having openings in a side, and second resonance units having a length of λg/2 and having at least one second opening in a side, are alternately arranged sequentially from the terminal end portion, two or more second resonance units being disposed in the straight shape microwave cavity resonator, and microwaves in phase from the second openings are introduced into the plasma chamber through the microwave transmitting means.