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Can we examine h beta please: https://logbooks.jlab.org/entry/4381711
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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 Jay Benesch via BTeam <bteam@jlab.org><br>
<b>Sent:</b> Friday, May 23, 2025 8:02:33 AM<br>
<b>To:</b> Dennis Turner <dturner@jlab.org>; BTeam <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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<div class="PlainText">It seems to me that the B spot should be smaller than all the others so
<br>
space charge effects are similar at the pre-buncher and buncher, The B <br>
beam is generally over-bunched so the high current beam(s) are under <br>
control.<br>
<br>
On 5/23/25 07:31, Dennis Turner wrote:<br>
> I agree with rematching injector to NL. We may find that once we rematch <br>
> the injector we may have to revisit that 7E match.<br>
> <br>
> Dennis<br>
> <br>
> ------------------------------------------------------------------------<br>
> *From:* BTeam <bteam-bounces@jlab.org> on behalf of Jay Benesch via <br>
> BTeam <bteam@jlab.org><br>
> *Sent:* Friday, May 23, 2025 7:24:53 AM<br>
> *To:* BTeam <bteam@jlab.org>; mmeuller@jlab.org <mmeuller@jlab.org><br>
> *Subject:* Re: [BTeam] B beam is blown. For that matter, the whole <br>
> machine is blown.<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> <https://
<br>
> logbooks.jlab.org/entry/4381741><br>
> harp traces post-match<br>
> <a href="https://logbooks.jlab.org/entry/4381745">https://logbooks.jlab.org/entry/4381745</a> <<a href=""></a>https://logbooks.jlab.org/
<br>
> entry/4381745> 7E01 A beam<br>
> <a href="https://logbooks.jlab.org/entry/4381746">https://logbooks.jlab.org/entry/4381746</a> <<a href=""></a>https://logbooks.jlab.org/
<br>
> entry/4381746> 7E01 B beam still big<br>
> <a href="https://logbooks.jlab.org/entry/4381751">https://logbooks.jlab.org/entry/4381751</a> <<a href=""></a>https://logbooks.jlab.org/
<br>
> entry/4381751> AE01 A beam<br>
> <a href="https://logbooks.jlab.org/entry/4381755">https://logbooks.jlab.org/entry/4381755</a> <<a href=""></a>https://logbooks.jlab.org/
<br>
> entry/4381755> AE01 B beam still big<br>
> <a href="https://logbooks.jlab.org/entry/4381756">https://logbooks.jlab.org/entry/4381756</a> <<a href=""></a>https://logbooks.jlab.org/
<br>
> entry/4381756> 2C05 X below design, Y 3x design<br>
> <a href="https://logbooks.jlab.org/entry/4381753">https://logbooks.jlab.org/entry/4381753</a> <<a href=""></a>https://logbooks.jlab.org/
<br>
> entry/4381753> 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> <<a href=""></a>https://logbooks.jlab.org/
<br>
> entry/4380694> Yan's summary Wednesday<br>
>> <a href="https://logbooks.jlab.org/entry/4381729">https://logbooks.jlab.org/entry/4381729</a> <<a href=""></a>https://logbooks.jlab.org/
<br>
> entry/4381729> IHAAE01 with B beam<br>
>> <a href="https://logbooks.jlab.org/entry/4381709">https://logbooks.jlab.org/entry/4381709</a> <<a href=""></a>https://logbooks.jlab.org/
<br>
> entry/4381709> IHAAE01 with A beam<br>
>> <a href="https://logbooks.jlab.org/entry/4380687">https://logbooks.jlab.org/entry/4380687</a> <<a href=""></a>https://logbooks.jlab.org/
<br>
> entry/4380687> chopper scans - B beam widest<br>
>> <a href="https://logbooks.jlab.org/entry/4380556">https://logbooks.jlab.org/entry/4380556</a> <<a href=""></a>https://logbooks.jlab.org/
<br>
> entry/4380556> 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> <<a href=""></a>https://logbooks.jlab.org/
<br>
> entry/4381707> 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>
> <br>
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