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<small>Please RSVP by COB on Monday, July 18, 2011 to: <a
moz-do-not-send="true" class="moz-txt-link-abbreviated"
href="mailto:lcarlson@jlab.org">lcarlson@jlab.org</a></small><br>
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<p class="MsoPlainText" style="text-align: center;" align="center"><span
style="font-size: 12pt; font-family: "Times New Roman","serif";">Wednesday,
July 20, 2011<br>
<b><span style="color: red;">***CC F113***</span></b><br>
<span style="color: black;">12:00-1:30pm</span></span><span
style="font-family: "Times New Roman","serif";"><br>
<br>
</span><b style=""><span
style="font-size: 18pt; font-family: "Times New Roman","serif";">Photocathode
Development at Jefferson Lab</span></b><b style=""><span
style="font-size: 14pt; font-family: "Times New Roman","serif";"><o:p></o:p></span></b></p>
<p class="MsoPlainText"
style="margin: 0in 9pt 0.0001pt; text-align: center;" align="center"><span
style="font-family: "Times New Roman","serif";"><br>
</span><b><span
style="font-size: 12pt; font-family: "Times New Roman","serif";">Russell
Mammei</span></b><b><span
style="font-family: "Times New Roman","serif";"></span></b><span
style="font-family: "Times New Roman","serif";"><br>
</span><span
style="font-size: 12pt; font-family: "Times New Roman","serif";"><o:p></o:p></span></p>
<p class="MsoPlainText"
style="margin: 0in 9pt 0.0001pt; text-align: center;" align="center"><span
style="font-size: 12pt; font-family: "Times New Roman","serif";">Thomas
Jefferson National Accelerator Facility<br>
</span></p>
<br>
<p><big><font face="Times New Roman, Times, serif"><small> Abstract:</small></font></big></p>
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<p class="MsoNormal" style="text-align: justify;"><big><font
face="Times New Roman, Times, serif"><small>In the past decade, there
has been con­sid­er­able in­ter­est in the gen­er­a­tion of tens of mA
av­er­age electron cur­rent in a pho­toin­jec­tor for use in current
and future accelerator applications.<span style=""> </span>Some
applications include Free Electron Lasers and the proposed Electron Ion
Collider.<span style=""> </span>Two photocathodes are frequently
considered for generating high average current electron beams and/or
beams with high brightness: GaAs:Cs and CsK<sub>2</sub>Sb.<span style="">
</span>Each photocathode has advantages and disadvantages, although
some attributes are based on assumptions and not demonstrated
performance at “production” accelerator facilities.<span style=""> </span>Until
recently, the GaAs:Cs photocathode has been tested extensively in a DC
field and CsK<sub>2</sub>Sb in an RF field. <span style=""> </span>To
make a well-informed choice for new accelerators, the performance of
both photocathodes should be measured under identical conditions.<span
style=""> </span>To this end the Polarized Source Group at JLab has
partnered with the instrumentation group at Brookhaven National Lab
(BNL) to evaluate CsK<sub>2</sub>Sb in the same DC field that has been
used to study GaAs:Cs.<span style=""> </span>In March of 2011, a CsK<sub>2</sub>Sb
photocathode was grown at BNL and successfully transported in vacuum to
the Injector Test Stand electron gun at JLab. <span style=""> </span>Since
then the quantum efficiency has been monitored, e.g. photocathode
lifetime, under average currents ranging from 1mA-20mA, with different
laser wavelengths.<span style=""> </span>An introduction to the
Injector Test Stand electron gun and our current results will be
presented.</small></font></big></p>
<br>
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