Unipolar electrostatic quadrupole lens and switching methods for charged beam transport
First Claim
1. An electrostatic quadrupole lens system comprising:
- a switching circuit controllably connected to ground and a first voltage potential;
a first pair of electrodes located opposite each other, connected to the switching circuit;
a second pair of electrodes located opposite each other, wherein the first pair of electrodes and the second pair of electrodes are equally spaced about a center point, the second pair of electrodes biased to a second voltage potential.
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Accused Products
Abstract
A linear acceleration system comprises one or more accelerating stages along an axis and a unipolar electrostatic quadruple lens in series with the one or more accelerating stages. The unipolar electrostatic quadruple lens focuses an ion beam in a direction transverse to the axis. The unipolar electrostatic quadruple lens includes a switching circuit, a first pair of electrodes, and a second pair of electrodes. The switching circuit controllably connects to ground and a first voltage potential. The electrodes of the first pair are located opposite each other and are connected to the switching circuit. The electrodes of the second pair are also located opposite each other and connected to the switching circuit. The second pair of electrodes are biased to a second voltage potential.
32 Citations
16 Claims
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1. An electrostatic quadrupole lens system comprising:
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a switching circuit controllably connected to ground and a first voltage potential;
a first pair of electrodes located opposite each other, connected to the switching circuit;
a second pair of electrodes located opposite each other, wherein the first pair of electrodes and the second pair of electrodes are equally spaced about a center point, the second pair of electrodes biased to a second voltage potential. - View Dependent Claims (2, 3, 4)
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5. A linear acceleration system comprising:
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one or more accelerating stages along an axis of the system; and
a first electrostatic quadrupole lens in series with the one or more accelerating stages that focuses an ion beam in a direction transverse to the axis, wherein the first electrostatic quadrupole lens comprises;
a switching circuit controllably connected to ground and a first voltage potential;
a first pair of electrodes located opposite each other, connected to the switching circuit; and
a second pair of electrodes located opposite each other, wherein the first pair of electrodes and the second pair of electrodes are equally spaced about a center point, the second pair of electrodes biased to a second voltage potential. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. A method of operating an ion implantation system, comprising:
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extracting an ion beam from an ion source;
determining whether a desired ion beam energy is greater than a first threshold; and
configuring a quadrupole lens along a beam path of the ion beam in one of a bipolar configuration or a unipolar configuration based on the determination. - View Dependent Claims (13, 14, 15, 16)
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Specification