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Calibration of the chaos spectrometer for small scattering angles Jamieson, Blair Alex
Abstract
For measurements of pion-nucleon scattering in the Coulomb-Nuclear Interference (CNI) region, it is implicit that we are looking at small scattering angles. At small scattering angles the in-plane (x,y coordinate) scattering angle is not the true scattering angle. Since the Canadian High Acceptance Orbit Spectrometer (CHAOS) has a vertical extent of plus or minus seven degrees, an in-plane scattering angle of zero degrees could, i n three dimensions, be seven degrees. The CHAOS detector's out-of-plane (z coordinate) information comes from three wire chambers: wire chamber one ( W C l ) cathode strips and anode wires, wire chamber two (WC2) cathode strips and anode wires, and wire chamber four's (WC4) two resistive wires. The out-of-plane information from WC4 requires a fringe field correction, because it lies outside the uniform magnetic field of CHAOS. The fringe field of CHAOS acts like a lens, in that it has a slight focusing effect on charged particles. The fringe field correction moves the WC4 (x,y,z) data point so that it is on the linear object ray. In this paper I will present the model for the fringe field correction. I will explain how the three dimensional scattering angle resolution was determined, and as the final test of the scattering angle I will present the cross-section for fiC scattering, obtained using CHAOS data.
Item Metadata
Title |
Calibration of the chaos spectrometer for small scattering angles
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1999
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Description |
For measurements of pion-nucleon scattering in the Coulomb-Nuclear Interference (CNI)
region, it is implicit that we are looking at small scattering angles. At small scattering
angles the in-plane (x,y coordinate) scattering angle is not the true scattering angle.
Since the Canadian High Acceptance Orbit Spectrometer (CHAOS) has a vertical extent
of plus or minus seven degrees, an in-plane scattering angle of zero degrees could, i n three
dimensions, be seven degrees.
The CHAOS detector's out-of-plane (z coordinate) information comes from three wire
chambers: wire chamber one ( W C l ) cathode strips and anode wires, wire chamber two
(WC2) cathode strips and anode wires, and wire chamber four's (WC4) two resistive
wires. The out-of-plane information from WC4 requires a fringe field correction, because
it lies outside the uniform magnetic field of CHAOS. The fringe field of CHAOS acts
like a lens, in that it has a slight focusing effect on charged particles. The fringe field
correction moves the WC4 (x,y,z) data point so that it is on the linear object ray.
In this paper I will present the model for the fringe field correction. I will explain
how the three dimensional scattering angle resolution was determined, and as the final
test of the scattering angle I will present the cross-section for fiC scattering, obtained
using CHAOS data.
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Extent |
5376707 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-06-12
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0099335
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1999-05
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.