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Hi Patrick,
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<div>thanks for your comments. Here are some replies - I am still in the process of updating the PAC presentation.<br id="lineBreakAtBeginningOfMessage">
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<div>On Jul 2, 2024, at 9:14 PM, Patrick Achenbach <patricka@jlab.org> wrote:</div>
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Good evening Sebastian,</div>
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I don't think that it is particularly useful to emphasize the fact that the individual experiments add up to "a total of 916 PAC days worth of new data". This notion of one experiment = one data set is common at very small facilities and is historically embedded
in the JLab user community. However, I don't think that there was ever a chance to get ~ 1000 PAC days awarded for CLAS12 running with the polarized target. What do you mean with "Including 120 PAC days on NH3 just for pDVCS"? To me, these bullet points are
misleading. In this jeopardy process you are defending the remaining 40 PAC days to finish a program of approved 120 PAC days.</div>
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I agree that my wording may have been a bit off. Here is what the slide says now:</div>
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<span style="font-size: 16pt;"><span style="font-family: Arial;">•</span></span><span style="font-size: 16pt; font-family: Arial;">8 experiments with a total of </span><span style="font-size: 16pt; font-family: Arial;">“916 </span><span style="font-size: 16pt; font-family: Arial;">PAC
days </span><span style="font-size: 16pt; font-family: Arial;">worth” </span><span style="font-size: 16pt; font-family: Arial;">of </span><span style="font-size: 16pt; font-family: Arial;">proposed new </span><span style="font-size: 16pt; font-family: Arial;">data</span></div>
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<span style="font-size: 16pt;"><span style="font-family: Arial;">•</span></span><span style="font-size: 16pt; font-family: Arial;">Due to simultaneous data collection for all channels with CLAS12, </span><span style="font-size: 16pt; font-family: Arial;">original</span><span style="font-size: 16pt; font-family: Arial;"> </span><font face="Arial"><span style="font-size: 21.333334px;">request
was</span><span style="font-size: 16pt;"> </span></font><span style="font-size: 16pt; font-family: Arial;">185 PAC days</span></div>
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<span style="font-size: 16pt;"><span style="font-family: Arial;">•</span></span><span style="font-size: 16pt; font-family: Arial;">Including 120 PAC days on NH</span><span style="font-size: 16pt; font-family: Arial; vertical-align: sub;">3</span><span style="font-size: 16pt; font-family: Arial;"> </span><span style="font-size: 16pt; font-family: Arial;">originally
requested </span><span style="font-size: 16pt; font-family: Arial;">for </span><span style="font-size: 16pt; font-family: Arial;">pDVCS</span><span style="font-size: 16pt; font-family: Arial;"> (E12-06-119(b))</span></div>
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<span style="font-size: 16pt;"><span style="font-family: Arial;">•</span></span><span style="font-size: 16pt; font-family: Arial;">Plus 60 more PAC days on ND</span><span style="font-size: 16pt; font-family: Arial; vertical-align: sub;">3</span><span style="font-size: 16pt; font-family: Arial;"> </span><span style="font-size: 16pt; font-family: Arial;">originally</span><span style="font-size: 16pt; font-family: Arial;"> </span><span style="font-size: 16pt; font-family: Arial;">requested</span><span style="font-size: 16pt; font-family: Arial;"> </span><span style="font-size: 16pt; font-family: Arial;">for </span><span style="font-size: 16pt; font-family: Arial;">nDVCS</span><span style="font-size: 16pt; font-family: Arial;"> (E12-06-109A)</span></div>
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<div>It is true that “high energy experiments” are used to having many channels measured at once, but at JLab, this is still not necessarily the norm (in Halls A and C). I put this information here for 2 reasons: </div>
<div>1) To drive home the point that all of the great Physics from RG-C will come in, regardless of what (some) members of the PAC may think is “unimportant"</div>
<div>2) In particular, the original program for DVCS required 120 days on p and 60 days on d, and hence, when PAC48 cut the total from 185 to 120 “with emphasis on DVCS”, they just showed their misunderstanding of the situation. So I want to be very clear this
time around.</div>
<div>Of course, I am not trying to re-litigate PAC48, but I think it should be absolutely clear that we already lost 1/3 of THEIR preferred Physics at PAC48, and they should not cut another 1/3 from that. <br>
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I am happy to show the conditional run schedule in my presentation on Monday. I am not sure if the PAC really appreciates a discussion on the beam-time scheduling by the proponents.</div>
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I am not trying to discuss beam-time scheduling - I am just rying to show that by combining RG-C and RG-G, the overhead is minimized and that the price to pay for 50% more PAC days is relatively small. I gave this slide a new header: “Possibility to Minimize
Overhead - Combine w/ RG-G”. Of course I’m open to other suggestions.</div>
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On page 20, you specify "• 40 PAC days on NH3 and ND3". How is this distributed? The reader is also asking for clarifying the ND3-NH3 split. I don't fully understand the following bullet point "•If run in conjunction with RG-G: Common auxiliary targets and
systematic measurements shared (C, CH2, CD2, 4He, Empty)". Do you mean that the auxiliary target measurements are only important when running in conjunction with RG-G? How many PAC days are needed on this for RG-C? Personally, I think that the need for systematic
measurements to complete the program is more convincing that the need for < 20 PAC days for NH3 and < 20 PAC days for ND3. </div>
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I tried to make it a bit clearer - now it says the following:</div>
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<span style="font-size: 18pt;">•</span><span style="font-size: 18pt; font-family: Arial;">40 PAC </span><span style="font-size: 18pt; font-family: Arial;">days split as previously between NH</span><span style="font-size: 18pt; font-family: Arial; vertical-align: sub;">3</span><span style="font-size: 18pt; font-family: Arial;"> and
ND</span><span style="font-size: 18pt; font-family: Arial; vertical-align: sub;">3</span><span style="font-size: 18pt; font-family: Arial;"> </span><span style="font-size: 16pt; font-family: Arial;">(+ 15% auxiliary targets)</span></div>
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<span style="font-size: 16pt;">–</span><span style="font-size: 16pt; font-family: Arial;">In addition, higher average target polarization (especially for ND</span><span style="font-size: 16pt; font-family: Arial; vertical-align: sub;">3</span><span style="font-size: 16pt; font-family: Arial;">)
and </span><span style="font-size: 16pt; font-family: Arial;">a modest increase in beam current will </span><span style="font-size: 16pt; font-family: Arial;">yield about 70%-100% (</span><span style="font-size: 16pt; font-family: Arial;">FoM</span><span style="font-size: 16pt; font-family: Arial;">)
more data</span></div>
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<span style="font-size: 16pt;">–</span><span style="font-size: 16pt; font-family: Arial;">Improved systematics and extended kinematic reach by running BOTH solenoid and torus polarities & optimal complement of background measurements </span><span style="font-size: 16pt; font-family: Arial;">(</span><span style="font-size: 16pt; font-family: Arial;">interrupted
previously by extended downtime</span><span style="font-size: 16pt; font-family: Arial;">), plus potentially higher </span><span style="font-size: 16pt; font-family: Arial; font-style: italic;">e</span><span style="font-size: 16pt; font-family: Arial; vertical-align: super;">-</span><span style="font-size: 16pt; font-family: Arial;"> energy</span></div>
<span style="font-size: 18pt; font-family: Arial;">If run in conjunction with RG-G: </span><span style="font-size: 18pt; font-family: Arial;">Recommissioning, common auxiliary </span><span style="font-size: 18pt; font-family: Arial;">targets and systematic
measurements </span><span style="font-size: 18pt; font-family: Arial;">shared </span><span style="font-size: 18pt; font-family: Arial;">=</span><span style="font-size: 18pt; font-family: Arial;">></span><span style="font-size: 18pt; font-family: Arial;"> optimal
use of time</span><span style="font-family: -webkit-standard; font-size: medium;"></span></div>
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<div>(The split was roughly 50-50 ND3/NH3, with a bit more of the former). We need the auxiliary targets either way - just for RG-C or just for RG-G - what I was trying to say is that if we can run both in succession, we can share most of them between both
RGs and hence they would use up less time from either. </div>
<div>I agree that systematics are one strong reason for more data, but I disagree that more statistics is not significant. We added more slides that show this - see also below. </div>
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On page 21, the highlighted necessity of multi-dimensional binning has - in my view - not been substantiated in this presentation. I get the point on "improved systematics".</div>
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The last bullet is now 2 bullets that read as follows:</div>
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<span style="font-size: 18pt;">•</span><span style="font-size: 18pt; font-family: Arial;">More statistics crucial for multi-dimensional binning, statistics-starved channels (DVCS, TCS, K-SIDIS), and all Deuteron </span><span style="font-size: 18pt; font-family: Arial;">asymmetries.</span></div>
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<span style="font-size: 18pt;">•</span><span style="font-size: 18pt; font-family: Arial;">Completing the set of originally planned run configurations and auxiliary measurements will lead to improved systematics.</span></div>
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<div>We added some slides (from Samy) specifically addressing the “multidimensional binning” argument (see elsewhere in this email chain).</div>
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Best, </div>
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Patrick</div>
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<div>Greetings, and have a nice rest of the weekend. - Sebastian </div>
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