The PEPPo method for polarized positrons and PEPPo II

Cardman, Lawrence S.

doi:10.1063/1.5040220

Title: The PEPPo method for polarized positrons and PEPPo II

Abstract

The Polarized Electrons for Polarized Positrons (PEPPo) experiment at the injector of the Continuous Electron Beam Accelerator Facility demonstrated for the first time the efficient transfer of polarization from electrons to positrons via a two-step process: polarized bremsstrahlung radiation is induced by a polarized electron beam in a high-Z target; then the polarized bremsstrahlung produces polarized positrons via the pair-production process in the same target. Positron polarization up to 82% was measured for an initial electron beam momentum of 8.19 MeV/c, limited only by the electron beam polarization of 85%. This technique extends polarized positron capabilities from GeV to MeV electron beams, and opens access to polarized positron beam physics to a wide community. We present the results of the PEPPo experiment and outline tentative plans for a follow-up experiment that would investigate key aspects of an approach based on PEPPo as a polarized positron source for the 12 GeV Upgrade of CEBAF.

Authors:

Cardman, Lawrence S. ^[1]

Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Publication Date:: 2018-05-01

Research Org.:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Nuclear Physics (NP)

Contributing Org.:: for the PEPPo Collaboration

OSTI Identifier:: 1440322

Report Number(s):: JLAB-PHY-18-2632; DOE/OR/23177-4331
Journal ID: ISSN 0094-243X; TRN: US1900816

Grant/Contract Number:: AC05-06OR23177

Resource Type:: Accepted Manuscript

Journal Name:: AIP Conference Proceedings

Additional Journal Information:: Journal Volume: 1970; Journal Issue: 1; Conference: JPOS17,12-15 Sep 2017. Newport News, VA, USA; Journal ID: ISSN 0094-243X

Publisher:: American Institute of Physics (AIP)

Country of Publication:: United States

Language:: English

Subject:: 43 PARTICLE ACCELERATORS; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Leptons; International science organizations; Photon scattering; Electromagnetic radiation; Particle beams

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                    Cardman, Lawrence S. The PEPPo method for polarized positrons and PEPPo II.  United States: N. p., 2018. 
Web.  doi:10.1063/1.5040220.

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                    Cardman, Lawrence S. The PEPPo method for polarized positrons and PEPPo II.  United States.  https://doi.org/10.1063/1.5040220

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                    Cardman, Lawrence S. Tue .  
"The PEPPo method for polarized positrons and PEPPo II".  United States.  https://doi.org/10.1063/1.5040220.  https://www.osti.gov/servlets/purl/1440322.

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@article{osti_1440322,

  title        = {The PEPPo method for polarized positrons and PEPPo II},

  author       = {Cardman, Lawrence S.},

  abstractNote = {The Polarized Electrons for Polarized Positrons (PEPPo) experiment at the injector of the Continuous Electron Beam Accelerator Facility demonstrated for the first time the efficient transfer of polarization from electrons to positrons via a two-step process: polarized bremsstrahlung radiation is induced by a polarized electron beam in a high-Z target; then the polarized bremsstrahlung produces polarized positrons via the pair-production process in the same target. Positron polarization up to 82% was measured for an initial electron beam momentum of 8.19 MeV/c, limited only by the electron beam polarization of 85%. This technique extends polarized positron capabilities from GeV to MeV electron beams, and opens access to polarized positron beam physics to a wide community. We present the results of the PEPPo experiment and outline tentative plans for a follow-up experiment that would investigate key aspects of an approach based on PEPPo as a polarized positron source for the 12 GeV Upgrade of CEBAF.},

  doi          = {10.1063/1.5040220},

  journal      = {AIP Conference Proceedings},

  number       = 1,

  volume       = 1970,

  place        = {United States},

  year         = {2018},

  month        = {5}

}

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Title: The PEPPo method for polarized positrons and PEPPo II

Abstract

Citation Formats

Charge and fluence lifetime measurements of a dc high voltage GaAs photogun at high average current journal, April 2011

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Strange-Quark Contributions to Parity-Violating Asymmetries in the Forward G0 Electron-Proton Scattering Experiment journal, August 2005

First Determination of the Weak Charge of the Proton journal, October 2013

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Parity-Violating Electron Scattering from He 4 and the Strange Electric Form Factor of the Nucleon journal, January 2006

Parity-violating electroweak asymmetry in e ⃗ p scattering journal, June 2004

Polarization transfer observables in elastic electron-proton scattering at Q 2 = 2.5 , 5.2, 6.8, and 8.5 GeV 2 journal, November 2017

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First Determination of the Weak Charge of the Proton text, January 2013

Strange Quark Contributions to Parity-Violating Asymmetries in the Forward G0 Electron-Proton Scattering Experiment text, January 2005

Parity Violating Measurements of Neutron Densities text, January 1999

Charge and fluence lifetime measurements of a dc high voltage GaAs photogun at high average current
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journal, January 2001

Strange-Quark Contributions to Parity-Violating Asymmetries in the Forward G0 Electron-Proton Scattering Experiment
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First Determination of the Weak Charge of the Proton
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