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Do we know what the driver is for the blown optics? If memory serves me well, we corrected the optics a week or two ago. We did an injector match after the first wien change (again, if memory serves me well.....I am getting old). Perhaps it's "burt restore
integrity"? Recommend, if we're not doing this already, once we have corrected optics in the main machine and in the Halls we establish a "golden allsave" with zero pos, post in PD shift plan under standing orders. Once we return from maintenance we can at
least compare present machine with the golden allsave and zero pos, also keeping track of what was changed/repaired/swapped out during maintenance. </div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> BTeam <bteam-bounces@jlab.org> on behalf of Michael Merz via BTeam <bteam@jlab.org><br>
<b>Sent:</b> Friday, May 23, 2025 8:19:39 AM<br>
<b>To:</b> Jay Benesch <benesch@jlab.org>; bteam@jlab.org <bteam@jlab.org>; Matthew Mueller <mmueller@jlab.org><br>
<b>Subject:</b> Re: [BTeam] B beam is blown. For that matter, the whole machine is blown.</font>
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Please keep me (crew chief) posted on the plan to address optics today.</div>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Jay Benesch <benesch@jlab.org><br>
<b>Sent:</b> Friday, May 23, 2025 07:27<br>
<b>To:</b> Michael Merz <mmerz@jlab.org><br>
<b>Subject:</b> Fwd: B beam is blown. For that matter, the whole machine is blown.</font>
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-------- Forwarded Message --------<br>
Subject: Re: B beam is blown. For that matter, the whole machine is blown.<br>
Date: Fri, 23 May 2025 07:24:53 -0400<br>
From: Jay Benesch <benesch@jlab.org><br>
To: BTeam <bteam@jlab.org>, mmeuller@jlab.org<br>
<br>
More recent material<br>
<br>
Ops matched at 7E01 <a href="https://logbooks.jlab.org/entry/4381741">https://logbooks.jlab.org/entry/4381741</a><br>
harp traces post-match<br>
<a href="https://logbooks.jlab.org/entry/4381745">https://logbooks.jlab.org/entry/4381745</a> 7E01 A beam<br>
<a href="https://logbooks.jlab.org/entry/4381746">https://logbooks.jlab.org/entry/4381746</a> 7E01 B beam still big<br>
<a href="https://logbooks.jlab.org/entry/4381751">https://logbooks.jlab.org/entry/4381751</a> AE01 A beam<br>
<a href="https://logbooks.jlab.org/entry/4381755">https://logbooks.jlab.org/entry/4381755</a> AE01 B beam still big<br>
<a href="https://logbooks.jlab.org/entry/4381756">https://logbooks.jlab.org/entry/4381756</a> 2C05 X below design, Y 3x design<br>
<a href="https://logbooks.jlab.org/entry/4381753">https://logbooks.jlab.org/entry/4381753</a> Hall B now makes it to the
<br>
dumplette without tripping ILM7S/9S01!<br>
<br>
My recommendation to reduce the B laser spot to ~1.3 mm round still <br>
holds. I also recommend rematching Injector to NL YMMV<br>
<br>
On 5/23/25 07:16, Jay Benesch wrote:<br>
> Colleagues,<br>
> <br>
> A selection of elogs. Scan the logbook for a fuller picture.<br>
> <br>
> <a href="https://logbooks.jlab.org/entry/4380694">https://logbooks.jlab.org/entry/4380694</a> Yan's summary Wednesday<br>
> <a href="https://logbooks.jlab.org/entry/4381729">https://logbooks.jlab.org/entry/4381729</a> IHAAE01 with B beam<br>
> <a href="https://logbooks.jlab.org/entry/4381709">https://logbooks.jlab.org/entry/4381709</a> IHAAE01 with A beam<br>
> <a href="https://logbooks.jlab.org/entry/4380687">https://logbooks.jlab.org/entry/4380687</a> chopper scans - B beam widest<br>
> <a href="https://logbooks.jlab.org/entry/4380556">https://logbooks.jlab.org/entry/4380556</a> laser size measurements in pdf<br>
> <br>
> All values 4 sigma from pdf<br>
> A laser X 1.60 mm Y 1.61 mm<br>
> B laser X 1.92 mm Y 2.00 mm<br>
> C laser X 1.22 mm Y 1.27 mm<br>
> D laser X 1.27 mm Y 1.42 mm<br>
> <br>
> Joe told me that they allow a larger spot for B because of the narrow <br>
> slit. The slit constains the beam in the longitudinal dimension, not <br>
> transversely.<br>
> <br>
> I suggest the B laser spot be adjusted to match C and D, ~1.3 mm in both <br>
> planes, this morning.<br>
> <br>
> <a href="https://logbooks.jlab.org/entry/4381707">https://logbooks.jlab.org/entry/4381707</a> fopt results with half-kick.
<br>
> Scraping in AL and BL. No response on the first kick in either plane <br>
> implies to me that the injector-NL match is blown. The sensitivity to <br>
> MBL0R03 suggests the beta functions there are far larger than the design <br>
> (x,y) (19.1, 13.3) m.<br>
> <br>
> Jay<br>
<br>
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