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I still think it would be cool to put Stairway to Heaven on the beam
via the tune mode PC and pick it up on the hall BCM.<br>
<br>
Arne - FY10 $$$ ?<br>
<br>
<a class="moz-txt-link-abbreviated" href="mailto:tiefen@jlab.org">tiefen@jlab.org</a> wrote:
<blockquote cite="mid:Pine.LNX.4.64.0911191235160.29798@jlabl1.jlab.org"
type="cite">
<pre wrap="">
On Wed, 18 Nov 2009, Arne Freyberger wrote:
</pre>
<blockquote type="cite">
<pre wrap=""> 1.3 Viewer limited BPMs Tief
Proposal to adjust the timing of the viewer limited beam pulse so that the
BPMs work during viewer limited mode.
* Summary
Viewer limited pulse is 10 ? s
This will require better timing on BPMs?
</pre>
</blockquote>
<pre wrap=""><!---->
Where did this question on BPM timing come from? I've asked to put the
viewer limited pulse in sync with the linac 4-usec trailer. There is NO
requirement for BPM timing changes, only to sync the viewer limited pulse
with the 350-usec delayed trailer instead of having it occur at beam sync
zero. If this were done and the viewer limited pulse were selected to
have a 4 microsecond duration, then the linac bpms would light up in
multipass mode to guide steering of the beam at reinjection through the
linacs instead of tripping RF after a few seconds (or milliseconds). The
ability to do this was important during commissioning of CEBAF at 4 GeV,
and was frozen out by a "let's keep the operators from making errors"
philolophy of severely restricting options for pulse structure. We're
going to need it again, and we would have benefited from it in the recent
past.
</pre>
<blockquote type="cite">
<pre wrap=""> Delay viewer limited pulse.
Take it up next week.
</pre>
</blockquote>
<pre wrap=""><!---->
I'm sorry to have been ill. It would have been useful for me to explain.
</pre>
<blockquote type="cite">
<pre wrap=""> 1.4 FY10 projects ALL
Any thoughts on what Bteam wants to accomplish in FY10. There are two downs
in FY10, Jan/Feb Winter down and the July/Aug Summer down.
* Continue/complete BSY diagnostic suite?
o viewers in front of dumplettes
o move more harps?
* Open to ideas
o halo detector in BSY
</pre>
</blockquote>
<pre wrap=""><!---->
Good idea.
</pre>
<blockquote type="cite">
<pre wrap=""> o finish the matching algorithm. Prove that our present
diagnostics and software provide a good match which is
verified by downstream harps.
o Continue/finish ODR R&D in Hall-A
o get undulator from Darsburry and put in a chicane. Can tune
to different energies, so in the linac one can measure beam
size of all five passes. Need a meter at the end of linac in
12 GeV and a new vacuum chamber in the BCOM.
</pre>
</blockquote>
<pre wrap=""><!---->
How is this better than a wire scanner profile monitor? Is the
improvement to allow measurement at full CW beam current?
</pre>
<blockquote type="cite">
<pre wrap=""> o Replace 5 MeV dipole. Retain -12.5, -30 degree ports, and
+12.5 or +30 degree ports. Magnet, vacuum chamber, power
supplies. Horizontal gap is XXX? Does ISU have such a
magnet? What are the field requirements? What are the space
limitations?
1.5 Optics-on-call
Outgoing
Mike Spata, Geoff Krafft Incoming
Alex Bogacz
* Program
o Production running in A and B
o Possible Compton optimization
o Thaw the turkey
</pre>
</blockquote>
<pre wrap=""><!---->
We never did a real test of the reduced buncher configuration that Reza
tuned up and which looked much more like "old times" behavior than the
present configuration does. The "bunch length" process which is used to
characterize bunch compression mangled the settings when it "restored" to
canonical phases rather than to the as-found phases when it was turned on.
When we tried to transport beam through the Compton Chicane, conditions
were not as they were when optimized. I think this should get a re-check.
</pre>
<blockquote type="cite">
<pre wrap="">Date: 2009-11-18 15:45:00 EST
HTML generated by org-mode 6.32trans in emacs 23
--
Arne Freyberger
Director Operations Department
Jefferson Lab Phone: (757) 269-6268
12000 Jefferson Avenue Pager: (757) 584-6268
Newport News, VA 23606 Email: <a class="moz-txt-link-abbreviated" href="mailto:freyberg@jlab.org">freyberg@jlab.org</a>
</pre>
</blockquote>
<pre wrap=""><!---->_______________________________________________
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</pre>
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