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Thanks Jay,
<div>Perhaps, we should discuss this option this Friday? Would you lead a discussion?</div>
<div>Thanks.</div>
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<div>Cheers,<br>
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<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt;"><span style="background-color: rgba(255, 255, 255, 0);">Alex<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt;"><span style="background-color: rgba(255, 255, 255, 0);">S. Alex Bogacz,<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin: 0cm 0cm 0.0001pt;"><span style="background-color: rgba(255, 255, 255, 0);">Accelerator Physics Group Leader<o:p></o:p></span></p>
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<div>Sent from my iPhone</div>
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<blockquote type="cite">On Apr 24, 2023, at 7:53 AM, Jay Benesch via FFA_CEBAF_Collab <ffa_cebaf_collab@jlab.org> wrote:<br>
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<div dir="ltr"><span>Colleagues, </span><br>
<span></span><br>
<span>An idea that came to me this morning. I suspect it doesn't fit, but have we any extraction ideas that do?
</span><br>
<span></span><br>
<span>1. assume that Hall D will run only as a solo hall, or will be closed in favor of resuming polarized photon work in Hall B, albeit with lower polarization since drift would be ~50 m instead of 75m
</span><br>
<span>2. build the SW splitter entirely in the straight, not encroaching on the arc</span><br>
<span>3. if ABC want, say, seventh pass beam, put in the eighth pass dumplet and set up the machine.
</span><br>
<span>4. within each splitter have a C magnet which is unpowered for recirculation and picks off the beam, as in the BSY, when extraction is desired. Vacuum will have to be common for the multiple lines.
</span><br>
<span>5. direct whichever pass beam is extracted into a chicane which leads to the transport recombiner and vertical RF separators. </span><br>
<span></span><br>
<span>Also, I checked with SRF engineers: the cryomodule internal supports can deal with ~5% slope so a ramp 16-20 m long to a false floor 80 cm above the real one would be compatible.
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<span></span><br>
<span>Jay </span><br>
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