Pair-Polarimeter for High Energy Protons

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The angle correlation in e{sup +}e{sup {minus}} pair production by linear polarized photon was proposed for photon polarization measurements by Yang and Berlin and Madansky. An accurate QED calculation with analysis of the possible experimental setup was done by L Maximon and H. Olsen. The effect was used successfully for measurement of the beam polarization. The limitation of the method at photon energies above 100 MeV arises from the small value of an angle between pair components. They propose a new polarimeter for high energy photons based on the well known correlation in electron-positron pair production from an amorphous converter. ... continued below

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97 Kilobytes pages

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Wojtsekhowski, B.; Tedeschi, D.; Vlahovic, B. & Danagulian, S. October 14, 2000.

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The angle correlation in e{sup +}e{sup {minus}} pair production by linear polarized photon was proposed for photon polarization measurements by Yang and Berlin and Madansky. An accurate QED calculation with analysis of the possible experimental setup was done by L Maximon and H. Olsen. The effect was used successfully for measurement of the beam polarization. The limitation of the method at photon energies above 100 MeV arises from the small value of an angle between pair components. They propose a new polarimeter for high energy photons based on the well known correlation in electron-positron pair production from an amorphous converter. The detector design utilizes silicon micro-strip detectors that allow the construction of a compact device useful in the few GeV photon energy range. The most important features of these detectors are the capability to detect two tracks separated by a very small distance ({approximately} 100 microns) and very good position resolution, ({approximately} a few microns). Because the typical opening angle in e{sup +}e{sup {minus}} pair is about 1/{gamma} and available space for a polarimeter is about 1 meter, the distance e{sup +}e{sup {minus}} is about a fraction of mm. It means that at the photon energies of interest, most of pairs have a distance e{sup +}e{sup {minus}} much larger than the micro strip detector limitation.

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97 Kilobytes pages

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  • 14th International SPIN Physics Symposium (SPIN 2000), Osaka (JP), 10/16/2000--10/21/2000

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  • Report No.: JLAB-PHY-01-04
  • Report No.: DOE/ER/40150-1804
  • Grant Number: AC05-84ER40150
  • Office of Scientific & Technical Information Report Number: 774727
  • Archival Resource Key: ark:/67531/metadc717117

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • October 14, 2000

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  • Sept. 29, 2015, 5:31 a.m.

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  • Feb. 5, 2016, 9:49 p.m.

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Wojtsekhowski, B.; Tedeschi, D.; Vlahovic, B. & Danagulian, S. Pair-Polarimeter for High Energy Protons, article, October 14, 2000; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc717117/: accessed December 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.