Ion beam extraction apparatus and method of use thereof
First Claim
1. A method for extracting ions, comprising the steps of:
- providing ions with an ion source, said ion source comprising;
an electron resonance cyclotron ion source, said electron resonance cyclotron generating the ions, the ions comprising at least one of;
cations; and
anions;
providing a triode extraction system, comprising;
said ion source maintained at a first potential;
an extraction electrode maintained at a third potential differing from said first potential; and
a gating electrode positioned between said ion source and said extraction electrode;
alternatingly (1) suppressing extraction of the ions from said ion source and (2) extracting a set of ions from said ion source through changing a second potential of said gating electrode from proximate the first potential to a value between the first potential and the third potential, said step of alternatingly (1) suppressing extraction of the ions from said ion source and (2) extracting a set of ions from said ion source further comprising the step of;
intermittently oscillating the second potential from +30±
10 kV to 0±
5 kV.
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Abstract
The invention comprises an apparatus and method of use thereof for extracting ions from an ion source, such as for use in cancer treatment or tomographic imaging. The extraction apparatus uses a triode extraction system, with the ion source and/or first electrode held at a first potential; an extraction electrode held at a second potential; and a gating electrode, positioned between the ion source and the extraction electrode, oscillating and/or alternating between a first suppression potential proximate that of the ion source potential and a second extraction potential between the ion source potential and the extraction electrode potential. Optionally, the ion source comprises an electron cyclotron resonance ion source.
390 Citations
12 Claims
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1. A method for extracting ions, comprising the steps of:
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providing ions with an ion source, said ion source comprising; an electron resonance cyclotron ion source, said electron resonance cyclotron generating the ions, the ions comprising at least one of; cations; and anions; providing a triode extraction system, comprising; said ion source maintained at a first potential; an extraction electrode maintained at a third potential differing from said first potential; and a gating electrode positioned between said ion source and said extraction electrode; alternatingly (1) suppressing extraction of the ions from said ion source and (2) extracting a set of ions from said ion source through changing a second potential of said gating electrode from proximate the first potential to a value between the first potential and the third potential, said step of alternatingly (1) suppressing extraction of the ions from said ion source and (2) extracting a set of ions from said ion source further comprising the step of; intermittently oscillating the second potential from +30±
10 kV to 0±
5 kV. - View Dependent Claims (2, 3, 4, 5, 7)
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6. A method for extracting ions, comprising the steps of:
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providing ions with an ion source, said ion source comprising; an electron resonance cyclotron ion source, said electron resonance cyclotron generating the ions, the ions comprising at least one of; cations; and anions; providing a triode extraction system, comprising; said ion source maintained at a first potential; an extraction electrode maintained at a third potential differing from said first potential; and a gating electrode positioned between said ion source and said extraction electrode; alternatingly (1) suppressing extraction of the ions from said ion source and (2) extracting a set of ions from said ion source through changing a second potential of said gating electrode from proximate the first potential to a value between the first potential and the third potential; imaging a tumor with a first two-dimensional imaging system using the ions extracted from said ion source; and imaging the tumor with a second two-dimensional imaging system using X-rays, said steps of imaging the tumor with said first two-dimensional imaging system and imaging the tumor with said second two-dimensional imaging system overlapping in time, said cations comprising at least one of; protons; C4+; and C6+.
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8. An apparatus for extracting ions, comprising:
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an ion source configured to provide the ions, a triode extraction system, comprising; said ion source maintained at a first potential during use; an extraction electrode maintained at a third potential, during use, differing from said first potential; and a gating electrode positioned between said ion source and said extraction electrode; an electrical ground connection to said extraction electrode; a first power supply configured to maintain the first potential of said ion source at 30±
20 kV; andsecond power supply configured to cycle the second potential between the first potential and the third potential, wherein a second potential of said gating electrode during use is alternatingly (1) suppressing extraction of the ions from said ion source and (2) extracting a set of ions from said ion source through changing the second potential of said gating electrode from proximate the first potential to a value between the first potential and the third potential. - View Dependent Claims (9, 10, 11)
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12. A system of extracting ions, comprising the step of:
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providing ions with an ion source; providing a triode extraction system, comprising; said ion source maintained at a first potential; an extraction electrode maintained at a third potential differing from said first potential; and a gating electrode positioned between said ion source and said extraction electrode; and at alternating times; suppressing extraction of the ions from said ion source using a first state of an electric field between said ion source and said gating electrode at a second potential of +30±
10 kV; andextracting a set of ions from said ion source through using a second state of the electric field by changing the second potential of said gating electrode from proximate the first potential to a value of;
(1) 0±
5 kV and (2) between the first potential and the third potential.
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Specification