US4060762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bimodal cavity resonator beam position monitor
Assignee: Atomic Energy of Canada Ltd AECL
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Filing: 1976-11-30
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Granted: 1977-11-29
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Expires: 1996-11-30
Abstract
Abstract A charged particle beam position monitor having a resonant cavity which is excited in a first mode if the monitored beam passing through it is displaced along the x-axis, and is excited in a second mode orthogonal to the first if the monitored beam passing through it is displaced along the y-axis. These modes are tuned to the same frequency and may be independently detected. The X and Y coordinates of the beam are determined by the amplitude and phase of the detected first and second orthogonal modes respectively.
Inventors
- 👤 Joseph McKeown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:09
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/29; G21; G21K; G21K1/00; G21K1/02; G21K1/04; G21K1/08; G21K1/093; H; H05; H05H; H05H7/00; H05H7/14; H05H7/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
189 words
A charged particle beam position monitor comprising: resonant cavity means capable of being excited in a first mode about the x-axis of the cavity means and in a second mode orthogonal to the first mode about the y-axis of the cavity means, said cavity means having beam holes in opposite surfaces of said cavity means, said beam holes being concentric with a z-axis through the intersection of the x-axis and y-axis, to allow the particle beam to pass through said cavity means such said first mode is excited in the cavity when the centroid of the beam is displaced along the x-axis and said second mode is excited in the cavity when the centroid of the beam is displaced along the y-axis; tuning means mounted on said cavity means for tuning the orthogonal modes to the same frequency; first detector means coupled to said first mode in said cavity means to provide a signal as a function of beam displacement along the x-axis; and second detector means coupled to said second mode in said cavity means to provide a signal as a function of beam displacement along the y-axis.
Claim 2
Dependent Claim
189 words
A charged particle beam position monitor comprising: resonant cavity means capable of being excited in a first mode about the x-axis of the cavity means and in a second mode orthogonal to the first mode about the y-axis of the cavity means, said cavity means having beam holes in opposite surfaces of said cavity means, said beam holes being concentric with a z-axis through the intersection of the x-axis and y-axis, to allow the particle beam to pass through said cavity means such said first mode is excited in the cavity when the centroid of the beam is displaced along the x-axis and said second mode is excited in the cavity when the centroid of the beam is displaced along the y-axis; tuning means mounted on said cavity means for tuning the orthogonal modes to the same frequency; first detector means coupled to said first mode in said cavity means to provide a signal as a function of beam displacement along the x-axis; and second detector means coupled to said second mode in said cavity means to provide a signal as a function of beam displacement along the y-axis.
Claim 3
Dependent Claim
52 words
A beam position monitor as claimed in claim 1 wherein said first and second detector means each include two magnetic probes, the first detector probes being located at opposite sides of said cavity on the x-axis and the second detector probes being located at opposite sides of said cavity on the y-axis.
Claim 4
Dependent Claim
151 words
A beam position monitor as claimed in claim 2 which further includes: first amplitude measuring means coupled to said first detector probes for determining the average amplitude of the signals from the first detector probes; first phase measuring means coupled to one of said first detector probes for determining the phase of the signal from the first detector probe; first means coupled to said amplitude measuring means and first phase measuring means for providing the x coordinate of the beam; second amplitude measuring means coupled to said second detector probes for determining the average amplitude of the signals from the second detector probes; second phase measuring means coupled to one of said second detector probes for determining the phase of the signal from the second detector probe; and second means coupled to said second amplitude measuring means and said second phase measuring means for providing the y coordinate of the beam.
Claim 5
Dependent Claim
27 words
A position monitor as claimed in claim 1 wherein said tuning means includes four capacitive tuning screws positioned at the electric field maxima of said orthogonal modes.
Claim 6
Dependent Claim
26 words
A position monitor as claimed in claim 4 wherein said cavity means consists of a right circular cavity resonant at a harmonic of particle beam frequency.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-28 | 1981-05-30 | 1981-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-28 | 1985-05-30 | 1985-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-28 | 1989-05-30 | 1989-11-29 | $7700.00 | Window Closed / Lapsed |