https://pfspipe.ipmu.jp/jira This file is an XML representation of an issue en-us 8.3.4 803005 13-09-2019 https://pfspipe.ipmu.jp/jira/browse/PIPE2D-446 DRP 2-D Pipeline <p>During DRP2D telecon on Aug 02 (<a href="https://sumire.pbworks.com/w/page/134796243/DRP%20telecon%202019%20Aug%202%20(Fri)%2013%3A00%20UTC" class="external-link" rel="nofollow">https://sumire.pbworks.com/w/page/134796243/DRP%20telecon%202019%20Aug%202%20(Fri)%2013%3A00%20UTC</a>), number of points were raised about ``broad'' line problem (e.g., <a href="https://pfspipe.ipmu.jp/jira/browse/PIPE2D-443" title="Deduce if the difference between the simulated and observed data is indicative of a problem" class="issue-link" data-issue-key="PIPE2D-443"><del>PIPE2D-443</del></a> and <a href="https://pfspipe.ipmu.jp/jira/browse/PIPE2D-439" title="Is HgAr and Neon PSF really different?!" class="issue-link" data-issue-key="PIPE2D-439"><del>PIPE2D-439</del></a>).</p> <p>1. Check what are the wavelengths that the other lamps (Neon, Krypton, Xenon) should exhibit the same effect.</p> <p>2. I claimed that shift of the central wavelength should be around 3 times smaller than the broadening. I read this ``somewhere''. Verify that reference.</p> <p>3. I also claimed that certain transitions (same lower level, just different spin of the lower state) should exhibit broadening of around 0.07 Angstrom. Verify that.</p> <p>4. Continue searching for people who might recognize this problem. I plan to send an email to ``pundits'' from the J. Gunn conference with whom I first discussed this problem last year.</p> <p>(On longer terms, we might need to devise how to handle this difference between different arc-lamps and the real data that will be coming soon).</p> PIPE2D-446

Follow up on broad-line discussion in DRP2D telecon, Aug 02 2019

Task Normal Done Done ncaplar ncaplar Wed, 7 Aug 2019 18:15:57 +0000 Thu, 8 Oct 2020 12:11:08 +0000 Wed, 17 Jun 2020 13:06:51 +0000 0 1 <p>1. From our current understanding (Jim, I and Ahmad - postdoc at Princeton) other lines should exhibit the same effect. I have searched for the same effect in the other lines, but I see no broadening whatsoever. This is summarized in plot ``Summary_result''. The plot shows the `full width half maximum'' and the ``full width 1.5% maximum''. The label categorized transitions with different lower levels. The lorentzian broadening would exhibit as high number for `full width 1.5% maximum'', without the large effect in FWHM. We see that this is indeed the case for the lines exhibit resonance broadening in Argon. Such effect is not seen in Neon and Krypton.</p> <p>Current working hypothesis is that the conditions for Argon are substantially different than in other lamps, because this is Mercury-Argon lamp. This is not fully satisfactory, because even it is quite different we expect that both Neon and Krypton are in the state where many atoms are in the ground state, so we would still expect to see some broadening. Some further investigation of relevant equations might shad some light. </p> <p>Based on insight from last paragraph Jim wants to see if the effect is there in the pure Argon lamp. Theoretically LAM should have Argon lamp (<a href="https://pfspipe.ipmu.jp/jira/secure/ViewProfile.jspa?name=fmadec" class="user-hover" rel="fmadec">fmadec</a>) but it is not clear if that was actually Argon lamp (<a href="https://pfspipe.ipmu.jp/jira/browse/PIPE2D-417" title="HgAr and Ar data looks indentical" class="issue-link" data-issue-key="PIPE2D-417"><del>PIPE2D-417</del></a>). If there is no Argon lamp available, one should be purchased. </p> <p>2. Resonance broadening does not create shift of the lines. Other types migth shift lines, but the resonance broadening responsible for broad Argon lines does not create shifts.</p> <p>3. Only one lower level will create resonance broadening. No other levels will create this type of broadening.</p> <p>4. Discussion with Ahmad have been very useful. Email to pundits - I still have to do. </p> <p>I sent a conclusion email to pundits on Jun 17, 2020. Closing this ticket. </p> Relates PIPE2D-558 PIPE2D-439 PIPE2D-443 Development Rank 0|02qpt6:508yl0chzzy4 Story Points 1.0