BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Simulations of Geometric Aspects for ARAPUCA Designs DTSTART;VALUE=DATE-TIME:20210916T200000Z DTEND;VALUE=DATE-TIME:20210916T201500Z DTSTAMP;VALUE=DATE-TIME:20260606T131535Z UID:indico-contribution-9-6@indico.physics.ucsd.edu DESCRIPTION:Speakers: Marcio Rostirolla Adames (UTFPR)\nThe photon detecti on system of DUNE Far Detector (FD) is based on ARAPUCA technology. The ne w version of ARAPUCA\, named X-ARAPUCA\, will be used in the first and sec ond modules. As the second module is based on vertical drift\, the design of the X-ARAPUCA needed to be changed and simulation studies are fundament al for the optimization of the device. This work presents the simulation s tudies of the design\, size\, shape\, and SiPM positioning inside the refl ective cavity.\n\nWe designed a Python module that creates the geometry fo r the simulations based on given parameters such as size of the detector\, numbers of SiPM and others. The physics of photons inside the X-ARAPUCA i s simulated by a ray-tracer written in C++ using an uniform grid as accele ration structure. Our simulations focus on reflections and refractions usi ng Snell's law on the interfaces and the total internal reflections inside the Wavelength Shifting Plate\, that absorbs every incoming photon and re -emits them in a random direction.\n\nThe simulation shows that the highes t efficiency is reached for thin X-ARAPUCA with a square shape. Better eff iciency is obtained for larger modules if one considers the number of SiPM per cm$^2$ of the active collection area. Rectangular modules are more ef ficient when the SiPMs are positioned on the short side.\n\nhttps://indico .physics.ucsd.edu/event/1/contributions/6/ LOCATION: URL:https://indico.physics.ucsd.edu/event/1/contributions/6/ END:VEVENT BEGIN:VEVENT SUMMARY:Demonstration of ~ns timing resolution in MicroBooNE Photon Detect ion System DTSTART;VALUE=DATE-TIME:20210916T201500Z DTEND;VALUE=DATE-TIME:20210916T203000Z DTSTAMP;VALUE=DATE-TIME:20260606T131535Z UID:indico-contribution-9-22@indico.physics.ucsd.edu DESCRIPTION:Speakers: Dante Totani (University of California\, Santa Barbr a)\nThe MicroBooNE detector\, located in the Booster Neutrino Beamline (BN B) at Fermilab\, has been operating since 2015 as part of the Short Baseli ne Neutrino (SBN) program. MicroBooNE's Liquid Argon Time Projection Chamb er is accompanied by a Photon Detection System (consisting of 32 PMTs) use d to measure the argon scintillation light and determine the timing of the neutrino interactions. This work will demonstrate the analysis techniques developed to improve the timing resolution of the light signals to $\\mat hcal{O}$(ns). The result obtained allows MicroBooNE to access the 2ns neut rino pulse structure of the BNB for the first time\, which enables signifi cant enhancement of cosmic background rejection for all neutrino analyses. Furthermore\, the ns timing resolution opens the door for searching new long-lived-particles (i.e. Heavy Neutral Lepton\, Higgs Portal Scalars) a s we develop light-based trigger systems for future large LArTPC experimen ts\, namely SBN and DUNE.\n\nhttps://indico.physics.ucsd.edu/event/1/contr ibutions/22/ LOCATION: URL:https://indico.physics.ucsd.edu/event/1/contributions/22/ END:VEVENT BEGIN:VEVENT SUMMARY:Photon detection probability predictionusing one-dimensional gener ative neural network DTSTART;VALUE=DATE-TIME:20210916T203000Z DTEND;VALUE=DATE-TIME:20210916T204500Z DTSTAMP;VALUE=DATE-TIME:20260606T131535Z UID:indico-contribution-9-48@indico.physics.ucsd.edu DESCRIPTION:Speakers: Wei Mu (Fermilab)\nPhoton detection is important for liquid argon detectors for direct dark matter searches or neutrino proper ty measurements. Precise simulation of photon transport is widely used to understand the probability of photon detection in liquid argon detectors. Traditional photon transport simulation within the framework ofGeant4bring s extreme challenge to computing resources with kilo-tonne-scale liquid ar gon detectors and GeV-level energy depositions. In this work\, we propose a one-dimensional generative model which bypasses photon transport simula tion and predicts the number of photons detected by particular photon dete ctors at the same level of detail asGeant4simulation.The application to ph oton detection systems in kilo-tonne-scale liquid argon detectors demonstr ates this novel generative model is able to reproduceGeant4simulation with good accuracy and 20x-50xfaster. This generative model can be used to fas t predict photon detection probability in huge liquid argon detectors like ProtoDUNE or DUNE.\n\nhttps://indico.physics.ucsd.edu/event/1/contributio ns/48/ LOCATION: URL:https://indico.physics.ucsd.edu/event/1/contributions/48/ END:VEVENT BEGIN:VEVENT SUMMARY:Neutrino Backgrounds in Future Liquid Noble Element Dark Matter Di rect Detection Experiments DTSTART;VALUE=DATE-TIME:20210916T210000Z DTEND;VALUE=DATE-TIME:20210916T211500Z DTSTAMP;VALUE=DATE-TIME:20260606T131535Z UID:indico-contribution-9-25@indico.physics.ucsd.edu DESCRIPTION:Speakers: Pietro Giampa (SNOLAB)\nExperiments that use liquid noble gasses as target materials\, such as argon and xenon\, play a signif icant role in direct detection searches for WIMP(-like) dark matter. As th ese experiments grow in size\, they will soon encounter a new background t o their dark matter discovery potential from neutrino scattering off nucle i and electrons in their targets. Therefore\, a better understanding of th is new source of background is crucial for future large-scale experiments such as ARGO and DARWIN. In this work\, we study the impact of atmospheric neutrino flux uncertainties\, electron recoil rejection efficiency\, reco il energy sensitivity\, and other related factors on the dark matter disco very reach. We also show that a significant improvement in sensitivity can potentially be obtained\, at large exposures\, by combining data from ind ependent argon and xenon experiments.\n\nhttps://indico.physics.ucsd.edu/e vent/1/contributions/25/ LOCATION: URL:https://indico.physics.ucsd.edu/event/1/contributions/25/ END:VEVENT BEGIN:VEVENT SUMMARY:Boosting background suppression in the NEXT experiment through Ric hardson-Lucy deconvolution DTSTART;VALUE=DATE-TIME:20210916T204500Z DTEND;VALUE=DATE-TIME:20210916T210000Z DTSTAMP;VALUE=DATE-TIME:20260606T131535Z UID:indico-contribution-9-88@indico.physics.ucsd.edu DESCRIPTION:Speakers: Ander Simón Estévez (Ben-Gurion University of the Negev)\nThe NEXT collaboration aims to observe neutrinoless double beta de cay in gaseous 136Xe using a high pressure gaseous Xe time projection cham ber with signal amplification by means of electroluminescence (EL). One of the advantages of the technique is that it allows for track reconstructio n making use of a sensor plane equipped with SiPMs located nearby the EL r egion. However\, the signals recorded in the TPC are degraded by electron diffusion and spread of light produced in the EL process\, limiting the po tential of the detection scheme. \n\nWe have recently developed an improve d reconstruction procedure based on the Richardson-Lucy deconvolution\, an iterative algorithm well-known in image processing and de-blurring. Decon volution allows reversing the smearing mechanisms in the NEXT TPC and sign ificantly enhances the definition of reconstructed tracks. Consequently\, detector performance is strongly boosted\, with a five-fold improvement in background rejection demonstrated on experimental data.\n\nIn the talk we will detail the algorithm application in the context of the NEXT experime nt with a focus on the performance in NEXT-White\, a 50 cm TPC currently o perating underground at Laboratorio Subterráneo de Canfranc. We will desc ribe the procedure applied to characterize the optical response of the cha mber by obtaining the point spread function that best describes the observ ed signals. We will also discuss the potential of the algorithm to ease th e tracking hardware requirements of future detector iterations.\n\nhttps:/ /indico.physics.ucsd.edu/event/1/contributions/88/ LOCATION: URL:https://indico.physics.ucsd.edu/event/1/contributions/88/ END:VEVENT BEGIN:VEVENT SUMMARY:Neutral bremsstrahlung calculations for TPCs DTSTART;VALUE=DATE-TIME:20210916T211500Z DTEND;VALUE=DATE-TIME:20210916T213000Z DTSTAMP;VALUE=DATE-TIME:20260606T131535Z UID:indico-contribution-9-81@indico.physics.ucsd.edu DESCRIPTION:Speakers: Pablo Amedo (Instituto Galego de Física de Altas En erxías (IGFAE\, USC))\nNeutral bremsstrahlung (NBrS) in the gas phase of Argon and Xenon TPCs has been measured recently\, with little ambiguity\, by groups in Novosibirsk and Coimbra/Santiago. While its implications for future experiments are intriguing\, and so far open-ended\, a lack of reli able calculations precludes the full exploitation of the phenomenon.\n\nWe have recently created a simulation module in the electron-transport code Pyboltz\,implementing the original theoretical framework introduced by Buz ulutskov et al.\, and showed an excellent description of NBrS data. The fr amework\, soon to be accessible through GitHub\, allows calculations of NB rS in any noble element mixture\, as well as in weakly-quenched mixtures\, at all electrical fields of interest below the excitation thresholds. For illustration purposes\, we will present results obtained in cases of inte rest\, discuss the analytical limits\, future improvements\, and the scope of this project.\n\nhttps://indico.physics.ucsd.edu/event/1/contributions /81/ LOCATION: URL:https://indico.physics.ucsd.edu/event/1/contributions/81/ END:VEVENT BEGIN:VEVENT SUMMARY:Study of the luminescence of He/CF4 mixture for the CYGNO detector DTSTART;VALUE=DATE-TIME:20210916T213000Z DTEND;VALUE=DATE-TIME:20210916T214500Z DTSTAMP;VALUE=DATE-TIME:20260606T131535Z UID:indico-contribution-9-78@indico.physics.ucsd.edu DESCRIPTION:Speakers: Andrea Messina (Sapienza Università di Roma & INFN) \nInnovative experimental techniques are needed to further search for dark matter weakly interacting massive particles. The ultimate limit is repres ented by the ability to efficiently reconstruct and identify nuclear and e lectron recoil events at the experimental energy threshold. Gaseous Time Projection Chambers (TPC) with optical readout are very promising candidat es thanks to the 3D event reconstruction capability of the TPC technique a nd the high sensitivity and granularity of last generation scientific lig ht sensors. The Cygno experiment is pursuing this technique by developing a TPC operated with He/CF4 gas mixture at atmospheric pressure equipped wi th a Gas Electron Multipliers (GEM) amplification stage that produces visi ble light collected by scientific CMOS camera. The optical approach has so far only exploited the light produced during the avalanche processes in t he GEM channels. In this contribution\, we discuss recent measurements per formed by the CYGNO collaboration which show the first evidence of additio nal luminescence in He/CF4 induced by electrons accelerated by a suitable electric field. The electron and photon yield has also been studied for ga s mixtures with a small percentage of isobutane. We give an overview of th e CYNGO project presenting the performances in terms of energy and spacial resolution of prototype detectors that have been built and operated so fa r. Finally\, we illustrate the plan to construct a 1m3 demonstrator expect ed in 2021/22 aiming at a larger scale apparatus in a later stage.\n\nhttp s://indico.physics.ucsd.edu/event/1/contributions/78/ LOCATION: URL:https://indico.physics.ucsd.edu/event/1/contributions/78/ END:VEVENT BEGIN:VEVENT SUMMARY:Nucleation efficiency of nuclear recoils in bubble chambers DTSTART;VALUE=DATE-TIME:20210916T214500Z DTEND;VALUE=DATE-TIME:20210916T220000Z DTSTAMP;VALUE=DATE-TIME:20260606T131535Z UID:indico-contribution-9-100@indico.physics.ucsd.edu DESCRIPTION:Speakers: Daniel Durnford (University of Alberta)\nBubble cham bers using liquid xenon (and liquid argon) have been operated (resp. plann ed) by the Scintillating Bubble Chamber (SBC) collaboration for GeV-scale dark matter searches and CEvNS from reactors. This will require a robust c alibration program of the nucleation efficiency of low-energy nuclear reco ils in these target media. Such a program has been carried out by the PICO collaboration\, which aims to directly detect dark matter using $\\mathrm {C_3 F_8}$ bubble chambers. Neutron calibration data from mono-energetic n eutron beam and AmBe source has been collected and analyzed\, leading to a global fit of a generic nucleation efficiency model for carbon and fluori ne recoils\, at thermodynamic thresholds of $2.45$ and $3.29\\\,\\mathrm{k eV}$. Fitting the many-dimensional model to the data ($34$ free parameters ) is a non-trivial computational challenge\, addressed with a custom Marko v Chain Monte Carlo approach\, which will be presented. Parametric MC stud ies undertaken to validate this methodology are also discussed. This fit p aradigm demonstrated for the PICO calibration will be applied to existing and future scintillating bubble chamber calibration data.\n\nhttps://indic o.physics.ucsd.edu/event/1/contributions/100/ LOCATION: URL:https://indico.physics.ucsd.edu/event/1/contributions/100/ END:VEVENT END:VCALENDAR