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-146 DRP 2-D Pipeline <p><a href="https://pfspipe.ipmu.jp/jira/secure/ViewProfile.jspa?name=aritter" class="user-hover" rel="aritter">aritter</a>'s work on wavelength calibration for LAM (yet to be ticketed) stalled due to difficulties in creating appropriate line lists. However, at our meeting of 2017-01-09, it was a little vague what those difficulties were. Please provide a brief description of the procedure followed and why it proved so time consuming.</p> PIPE2D-146

Describe issues around building line lists

Story Major Done Done aritter swinbank Mon, 9 Jan 2017 19:01:46 +0000 Fri, 14 Apr 2017 21:16:45 +0000 Fri, 14 Apr 2017 21:16:45 +0000 0 2 <p>We want to create line lists for any possible combination of arc lamps. As input line lists I use the data from the NIST Atomic Database for the individual lamps. The problem is to remove lines from the combined line list which are blended, asymmetric, or else flagged as problematic. Removing blended lines not as easy as it might seem. If one line in the blend is much stronger than the other line(s) then we want to keep the strong line in the list as it should not be affected much by a weak line. My approach to creating a combined line list is as follows:</p> <ul> <li>Search the combined line list for possible blends and remove either all lines in the blend if they are of similar strength, or remove only the week line(s) in the blend in case the strong line is significantly (orders of magnitude) stronger</li> <li>Remove all lines which are flagged as problematic</li> <li>Create an approximate line list <span class="error">&#91;pixel, wavelength&#93;</span> from the predicted pixel vs. wavelength file</li> <li>Measure the shape of the remaining lines and remove remaining possible blends as well as lines which do not show up in the spectrum<br/> I believe that I was pretty close to getting a reliable procedure running when I stopped working on it.</li> </ul> <p>At our meeting of 2017-04-14, we agreed that the above would do for now, and we'll press ahead with <a href="https://pfspipe.ipmu.jp/jira/browse/PIPE2D-139" title="Add more line lists for individual lamps and a task to create one for any combination" class="issue-link" data-issue-key="PIPE2D-139"><del>PIPE2D-139</del></a>. Andreas will provide detailed reports on any problems he encounters on that ticket.</p> Development Rank 0|031vid:xi074 Sprint 2014-17 Story Points 1.0