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<p class="MsoNormal" style="margin-bottom: 0.0001pt; text-align:
justify; line-height: normal;"><span style="font-size: 12pt;
font-family: "Times New Roman";" lang="EN-US">Dear
all,<br>
</span></p>
<p class="MsoNormal" style="margin-bottom: 0.0001pt; text-align:
justify; line-height: normal;"><span style="font-size: 12pt;
font-family: "Times New Roman";" lang="EN-US">Here
is an abstract that Jonathan prepared and wishes to submit at
the HEP2011 conference that<br>
will be hold in Grenoble in july. Jonathan's status at that
period is not yet settled but it would<br>
happen right after his defense. <br>
Please send me comments and questions by wednesday next week.</span></p>
<p class="MsoNormal" style="margin-bottom: 0.0001pt; text-align:
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font-family: "Times New Roman";" lang="EN-US"><br>
Thanks, Eric<br>
<br>
</span></p>
<p class="MsoNormal" style="margin-bottom: 0.0001pt; text-align:
justify; line-height: normal;"><span style="font-size: 12pt;
font-family: "Times New Roman";" lang="EN-US">--------------
Proposed abstract -----------<br>
</span></p>
<p class="MsoNormal" style="margin-bottom: 0.0001pt; text-align:
justify; line-height: normal;"><span style="font-size: 12pt;
font-family: "Times New Roman";" lang="EN-US">The
Polarized Electrons for Polarized Positrons (PEPPo)
experiment, planned at Jefferson Lab to <br>
demonstrate the transfer of polarization from a low energy
(<10 MeV) electron beam to positrons <br>
via Bremsstrahlung and pair creation in a single target, is
discussed. </span></p>
<p class="MsoNormal" style="margin-bottom: 0.0001pt; text-align:
justify; line-height: normal;"><span style="font-size: 12pt;
font-family: "Times New Roman";" lang="EN-US">Positron
production in particle accelerators widely relies on the
creation of electron-positron <br>
pairs, however, if the incident high energy particle (photon
or lepton) is polarized then the resultant <br>
products will carry some portion of the polarization. Indeed,
this approach has been successfully <br>
tested using polarized photons created with a multi-GeV
electron accelerator to generate positrons <br>
with polarization >80%. Alternatively, an incident
polarized electron beam should offer the same <br>
potential.<span style=""> </span>Although pair creation
yield suffers at low energy, recent advances of spin polarized
<br>
electron sources at Jefferson Lab to sustain milliampere
polarized electron beams suggests that a <br>
polarized positron source based upon a low energy <10 MeV
polarized electron beam may <br>
be attractive in some applications.<span style=""> </span>Further,
a successful demonstration of this technique <br>
would provide useful information to potentially cast a similar
positron source using an even <br>
higher electron beam energy (100-500 MeV).<span style=""> </span></span></p>
<p class="MsoNormal" style="margin-bottom: 0.0001pt; text-align:
justify; line-height: normal;"><span style="font-size: 12pt;
font-family: "Times New Roman";" lang="EN-US">An
overview of the physics case, design simulation and a
description of the PEPPo experiment <br>
will be presented.</span></p>
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