Determination of time zero from a charged particle detector
First Claim
1. A method for reconstructing the trajectory of a charged particle passing through a charged particle detector having a plurality of drift cells, said method comprising:
- (a) obtaining hit signals representing identifiers of drift cells hit by charged particles and corresponding hit times;
(b) grouping in-time drift cell hits identified as being associated with a track of a particular charged particle passing through said detector;
(c) initially estimating time zero for said particular charged particle;
(d) determining drift radii based on estimates of time zero, drift time conversion data and the time of the hit;
(e) fitting linear tracks to drift radii corresponding to a particular time-zero; and
(f) searching and selecting a time-zero value associated with the best of the track fits performed for particular charged particle and computing error in time-zero and tracking parameters.
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Accused Products
Abstract
A method, system and computer program is used to determine a linear track having a good fit to a most likely or expected path of charged particle passing through a charged particle detector having a plurality of drift cells. Hit signals from the charged particle detector are associated with a particular charged particle track. An initial estimate of time zero is made from these hit signals and linear tracks are then fit to drift radii for each particular time-zero estimate. The linear track having the best fit having the best fit is then search and selected and errors in fit and tracking parameters computed. The use of large and expensive fast detectors needed to time zero in the charged particle detectors can be avoided by adopting this method and system.
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Citations
25 Claims
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1. A method for reconstructing the trajectory of a charged particle passing through a charged particle detector having a plurality of drift cells, said method comprising:
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(a) obtaining hit signals representing identifiers of drift cells hit by charged particles and corresponding hit times; (b) grouping in-time drift cell hits identified as being associated with a track of a particular charged particle passing through said detector; (c) initially estimating time zero for said particular charged particle; (d) determining drift radii based on estimates of time zero, drift time conversion data and the time of the hit; (e) fitting linear tracks to drift radii corresponding to a particular time-zero; and (f) searching and selecting a time-zero value associated with the best of the track fits performed for particular charged particle and computing error in time-zero and tracking parameters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system for reconstructing the trajectory of at least one charged particle passing through a detector having a plurality of drift cells, said system comprising a controller adapted and arranged to:
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(a) obtain hit signals representing identifiers of drift cells hit by charged particles and corresponding hit times; (b) group in-time drift cell hits identified as being associated with a track of a particular charged particle passing through said detector; (c) initially estimate time zero for said particular charged particle; (d) determine drift radii based on estimates of time zero, drift time conversion data and time of the hit; (e) fit linear tracks to drift radii corresponding to a particular time-zero; and (f) search and select a time-zero value associated with the best of the track fits performed for particular charged particle and compute error in time-zero and tracking parameters. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A computer program product comprising:
- a computer-usable data carrier storing instructions that, when executed by a computer, cause the computer to perform a method for reconstructing the trajectory of a charged particle passing through a detector having a plurality of drift cells, said method comprising;
(a) obtaining hit signals representing identifiers of drift cells hit by charged particles and corresponding hit times; (b) grouping in-time drift cell hits identified as being associated with a track of a particular charged particle passing through said detector; (c) initially estimating time zero for said particular charged particle; (d) determining drift radii based on estimates of time zero, drift time conversion data and the time of the hit; (e) fitting linear tracks to drift radii corresponding to a particular time-zero; and (f) searching and selecting a time-zero value associated with the best of the track fits performed for particular charged particle and computing error in time-zero and tracking parameters. - View Dependent Claims (22, 23, 24)
- a computer-usable data carrier storing instructions that, when executed by a computer, cause the computer to perform a method for reconstructing the trajectory of a charged particle passing through a detector having a plurality of drift cells, said method comprising;
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25. A system for reconstructing the trajectory of a charged particle, includes a first set of position sensitive detectors located on a first side of an object volume to measure positions and angles of incident charged particles towards the object volume;
- a second set of position sensitive detectors located on a second side of the object volume opposite to the first side to measure positions and angles of outgoing charged particles exiting the object volume; and
a signal processing unit configured to receive data of measured signals from the first set of position sensitive detectors and measured signals from the second set of position sensitive detectors and determine the trajectory of charged particles passing through said object volume from said signals.
- a second set of position sensitive detectors located on a second side of the object volume opposite to the first side to measure positions and angles of outgoing charged particles exiting the object volume; and
Specification