BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:CIDeR-ML General Meeting DTSTART:20260911T000000Z DTEND:20260911T010000Z DTSTAMP:20261007T092800Z UID:indico-event-10733@indico.slac.stanford.edu DESCRIPTION:https://u-tokyo-ac-jp.zoom.us/j/83932834349Link to Recording\n \nQuick recap\nThis meeting was a roundtable discussion focused on updates and progress reports from various team members working on detector calibr ation and simulation projects. Naomi introduced herself as a PhD student w orking on the Hyper-Kamiokande far detector and reported on her work using LUCiD to set up calibration scenarios with a light injection system\, tho ugh she identified concerning amounts of backscatter at the injection site that may be related to a known bug in LUCiD. Riya presented her compariso n of light injection simulations between SKDETSIM and LUCiD\, showing gene rally good agreement but some mismatches that could be due to differences in PMT positioning and photon numbers. The team discussed technical detail s about PMT positioning\, photon injection rates\, and potential sources o f discrepancies between the two simulation tools. Zhenxiong reported on he r presentation at the WCTE collaboration meeting about probing angular res ponse using the SIREN model with cosmic muon data\, though there was discu ssion about uncertainty propagation through SIREN parameters and how to co nnect those to physical parameters. Junjie provided an update on ongoing w ork investigating limitations of the sirenTV model\, particularly focusing on frequency domain analysis and the impact of omega-0 on model performan ce. The conversation ended with a discussion about the timeline for publis hing their paper\, with the team agreeing to aim for completion by the end of September\, contingent on resolving current performance limitations in the SIREN model.\nNext steps\nNaomi\n\nCheck the positions of the light i njectors and PMTs in LUCiD to ensure they match those in WCSim and the act ual injection locations.\nShare the event displays from LUCiD in the chat for comparison once her cluster is operational.\n\nRiya\n\nInvestigate the source of the mismatch in the direct light comparison between SKDETSIM an d LUCiD\, starting by increasing the number of photons in the simulation t o reduce statistical variation.\n\nJunjie\n\nReport at the next meeting (i n a week) on the resolution of the SIREN model's performance limitations\, with the aim to finalize the paper by the end of September.\n\nOmar\n\nPr ovide Naomi with the branch of the LUCiD code that contains the fix for th e backscatter issue once it is ready.\nPresent slides next week showing th e fixes made to LUCiD and their impact on calibration.\n\nSummary\nHyper-K Calibration Progress Report\nPatrick welcomed a new participant\, Naomi\, who introduced herself as a PhD student working on the Hyper-Kamiokande c alibration group. Naomi reported on her progress with using LUCiD to set u p calibration scenarios with their light injection system\, including repl icating light profiles from their UK-built system. She mentioned encounter ing concerning amounts of backscatter at the injection site while working with LUCiD\, which she is currently investigating to determine if it's a u ser or coding issue.\nPMT Geometry Backscatter Issues\nThe team discussed issues with light injector positioning and backscatter in the PMT geometry . Naomi identified concerns about backscatter in her simulations\, particu larly with realistic light profiles compared to test sources. Omar mention ed a bug in LUCiD related to light accounting for sensors after the first step\, which could explain Naomi's observations. Patrick suggested reviewi ng event displays for backscatter issues\, and Riya reported she hadn't sp ecifically observed backscatter problems in her work on Super-K geometry.\ nBeam Profile Simulation Comparison\nRiya presented a comparison of beam p rofiles between SKDETSIM and LUCiD simulations at 405 wavelength\, showing similar beam shapes but some mismatches in charge fractions. The team dis cussed potential causes including differences in PMT positioning and photo n injection rates\, with Omar noting that the current photon count of 8\,0 00 per pulse seemed low. suggested increasing the number of photons in bot h simulations to reduce statistical variation and better identify the sour ce of mismatches.\nSIREN Model Parameter Discussion\nThe team discussed on going work on fixes and calibration\, with one member reporting progress o n slides demonstrating completed fixes that would be ready for review next week. Zhenxiong presented on probing angular response using the SIREN mod el with WCTE cosmic muon data at a recent collaboration meeting\, though s ome participants questioned the approach to uncertainty propagation throug h SIREN parameters. The discussion revealed confusion about whether SIREN parameters have meaningful physical interpretations or if uncertainty prop agation should focus on reconstructed objects rather than the model parame ters themselves.\nSIREN Model Physics Performance\nKazuhiro explained that when working with SIREN models\, the focus should be on measuring systema tics impact on final physics performance rather than individual model para meters. He suggested creating a diagram to clarify the physics goals and u ncertainty measurement approach\, noting that while analytical models can measure parameter uncertainties directly\, SIREN models would need a diffe rent propagation method. Junjie provided an update on studying SIREN model limitations\, mentioning a 2021-2022 paper that identified constraints on implicit neural representations in frequency space and the importance of the omega-0 parameter in SIREN models.\nSiren Performance Issues Resolutio n Timeline\nThe team discussed a milestone paper originally due end of Aug ust\, but current Siren performance issues need resolution before completi on. Junjie estimated addressing the performance limits by the next meeting \, with paper completion taking an additional week afterward. The group co nfirmed the end of September deadline remains achievable\, as significant writing is already complete and only specific performance issues need reso lution.\n\n\nhttps://indico.slac.stanford.edu/event/10733/ URL:https://indico.slac.stanford.edu/event/10733/ END:VEVENT END:VCALENDAR