BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Axion Detection: Techniques\, Experiments and Instrumentation DTSTART;VALUE=DATE-TIME:20230906T140000Z DTEND;VALUE=DATE-TIME:20230906T142000Z DTSTAMP;VALUE=DATE-TIME:20260717T180844Z UID:indico-contribution-526-3320@indico.tlabs.ac.za DESCRIPTION:Speakers: Ben McAllister (Swinburne University of Technology)\ nAxions are a hypothetical elementary particle originally proposed as a re sult of the Peccei-Quinn solution to the Strong CP problem. With the right masses\, axions are a compelling dark matter candidate and have been the subject of growing interest in recent years among the international dark m atter detection community. \n\nGenerally\, axion dark matter is very light – on the order of micro-eV in mass (give or take a few orders of magnit ude) meaning that detection techniques look radically different from commo n WIMP detectors. Axions are theorized to have several couplings to the st andard model\, the most probed of which is the axion-photon coupling. Ther e are various axion dark matter detection experiments around the world whi ch seek to exploit this coupling\, by converting axions into photons and v ice-versa.\n\nWe will discuss some of the common axion detection technique s\, with a focus on axion haloscopes\, and give an overview of some of spe cific experiments in the field such as ADMX and ORGAN. We will look at the current state of the art in axion detection and discuss the future of the field with a focus on instrumentation and detector technology.\n\nhttps:/ /indico.tlabs.ac.za/event/112/contributions/3320/ LOCATION: Meeting Room 2.61 - 2.63 URL:https://indico.tlabs.ac.za/event/112/contributions/3320/ END:VEVENT BEGIN:VEVENT SUMMARY:Quenching factor measurements for the NEWS-G experiment DTSTART;VALUE=DATE-TIME:20230906T154000Z DTEND;VALUE=DATE-TIME:20230906T160000Z DTSTAMP;VALUE=DATE-TIME:20260717T180844Z UID:indico-contribution-526-3154@indico.tlabs.ac.za DESCRIPTION:Speakers: Neha Panchal (Queen's University)\nThe NEWS-G experi ment is a dark matter experiment based on gaseous detectors\, located at S NO lab. The experiment aims to detect WIMPs by measuring nuclear recoils i n noble gases using a spherical proportional counter (SPC) detector\, whic h offers high sensitivity due to its unprecedented low energy threshold. A ccurate measurement of the recoil energy requires knowledge of the quenchi ng factor (QF)\, which quantifies the reduction of ionization due to nucle ar recoils compared to electromagnetic interactions. We have already condu cted quenching factor (QF) measurements at TUNL using a mixture of Ne + CH 4 gas at 2 bar. As part of our future plans\, we intend to measure the QF using various gas mixtures and different detector parameters. To facilitat e these in-beam QF measurements\, we recently carried out a tabletop exper iment at Queen's University to study SPC detector characteristics for diff erent detector parameters. Plan for another campaign at TUNL for QF measur ement is ongoing and a possibility of conducting such an experiment at Ude M is also underway.\n\nIn this talk\, the highlights of the tabletop exper iment will be presented. In addition\, the past measurement\, current stat us\, and the future plans of the NEWS-G collaboration in measuring QF with SPC will be summarized.\n\nhttps://indico.tlabs.ac.za/event/112/contribut ions/3154/ LOCATION: Meeting Room 2.61 - 2.63 URL:https://indico.tlabs.ac.za/event/112/contributions/3154/ END:VEVENT BEGIN:VEVENT SUMMARY:Electron transport measurements in liquid xenon with Xenoscope\, a large-scale DARWIN demonstrator DTSTART;VALUE=DATE-TIME:20230906T144000Z DTEND;VALUE=DATE-TIME:20230906T150000Z DTSTAMP;VALUE=DATE-TIME:20260717T180844Z UID:indico-contribution-526-3123@indico.tlabs.ac.za DESCRIPTION:Speakers: Yanina Biondi (KIT)\nThere is a compelling physics c ase for a large\, xenon-based underground detector devoted to dark matter and other rare-event searches. A two-phase time projection chamber as inne r detector allows for a good energy resolution\, a three-dimensional posit ion determination of the interaction site and particle discrimination. To study challenges related to the construction and operation of a multi-tonn e scale detector\, we have designed and constructed a vertical\, full-scal e demonstrator for the DARWIN experiment at the University of Zurich. Here we present first results from a several-months run with 343 kg of xenon a nd electron drift lifetime and transport measurements with a 53 cm tall pu rity monitor immersed in the cryogenic liquid. After 88 days of continuous purification\, the electron lifetime reached a value of 664(23) microseco nds. We measured the drift velocity of electrons for electric fields in th e range (25--75) V/cm\, and found values consistent with previous measurem ents. We also calculated the longitudinal diffusion constant of the electr on cloud in the same field range\, and compared with previous data\, as we ll as with predictions from an empirical model.\n\nhttps://indico.tlabs.ac .za/event/112/contributions/3123/ LOCATION: Meeting Room 2.61 - 2.63 URL:https://indico.tlabs.ac.za/event/112/contributions/3123/ END:VEVENT BEGIN:VEVENT SUMMARY:Progress on a novel coextruded high-voltage feedthrough concept fo r DarkSide-20k DTSTART;VALUE=DATE-TIME:20230906T152000Z DTEND;VALUE=DATE-TIME:20230906T154000Z DTSTAMP;VALUE=DATE-TIME:20260717T180844Z UID:indico-contribution-526-3217@indico.tlabs.ac.za DESCRIPTION:Speakers: Tyler Erjavec (University of California Davis)\nAs n oble liquid time projection chambers get larger\, so does the high voltage (HV) requirements required to maintain strong electric drift fields. HV f eedthrough (FT) designs become increasingly complex given limitations impo sed by cryogenic temperatures\, HV\, and cryostat geometry. In this talk\, progress on a novel HV FT using a coextruded multi-layered coaxial cable is presented for DarkSide-20k\, emphasizing design considerations implemen ted to the unique\, fully-plastic cable construction.\n\nDarkSide-20k is a 49.7 ton active volume dual-phase underground argon time projection chamb er (TPC) that will perform the search for dark matter reaching the sensiti vity 4.9e10-48cm2 with for 90% C.L. exclusion for a 1TeV/c2 over a 10yr ru n.\n\nhttps://indico.tlabs.ac.za/event/112/contributions/3217/ LOCATION: Meeting Room 2.61 - 2.63 URL:https://indico.tlabs.ac.za/event/112/contributions/3217/ END:VEVENT BEGIN:VEVENT SUMMARY:NEWS-G: Detection of low mass WIMPs with Spherical Proportional Co unters DTSTART;VALUE=DATE-TIME:20230906T150000Z DTEND;VALUE=DATE-TIME:20230906T152000Z DTSTAMP;VALUE=DATE-TIME:20260717T180844Z UID:indico-contribution-526-2990@indico.tlabs.ac.za DESCRIPTION:Speakers: Philippe Gros (Queen's University)\nNEWS-G is an exp eriment searching for dark matter using the Spherical Proportional Counter (SPC) technique. Such detectors can operate significant mass of target\, of order of kgs with meter size spheres\, while keeping single ionization electron detection sensitivity. They can be filled with gaseous targets of low atomic mass such as hydrogen\, helium\, and neon\, giving sensitivity to low mass WIMPs down to O(0.1GeV). Using multiple taget gases\, the det ector can characterise unexpected backgrounds and systematic effects.\nThe talk will cover principle of operations of the SPC and a description of t he 140cm diameter detector and compact shielding\, installed in the SNOLAB underground facility. The latest WIMP limits obtained with a temporary sh ield at the underground laboratory of Modane (LSM\, France) with methane a s target gases will be presented. Preliminary results from the full detect or at SNOLAB with additional gas mixtures will also be shown.\nThe talk wi ll also introduce projects to improve the SPC performance\, and expand the ir reach to coherent elastic neutrino-nucleus scattering (CEvNS). \nAnoth er contribution to this conference describes calibration of the ionisation yield from nuclear recoils using smaller SPCs.\n\nhttps://indico.tlabs.ac .za/event/112/contributions/2990/ LOCATION: Meeting Room 2.61 - 2.63 URL:https://indico.tlabs.ac.za/event/112/contributions/2990/ END:VEVENT BEGIN:VEVENT SUMMARY:Status and prospects of the low radioactivity Argon for dark matte r searches DTSTART;VALUE=DATE-TIME:20230906T142000Z DTEND;VALUE=DATE-TIME:20230906T144000Z DTSTAMP;VALUE=DATE-TIME:20260717T180844Z UID:indico-contribution-526-2900@indico.tlabs.ac.za DESCRIPTION:Speakers: Roberto Santorelli (CIEMAT - Madrid)\nA major global effort is currently underway to obtain radiopure argon for DarkSide-20k ( DS-20k)\, the first large-scale detector of the Global Argon Dark Matter C ollaboration (GADMC). The Urania project aims to extract underground argon (UAr) from CO2 wells in the USA at a production rate of approximately 300 kg/day. Additional chemical purification of the UAr will be necessary bef ore it can be used in the DS-20k LAr-TPC. The Aria project will purify the UAr using a cryogenic distillation column (Seruci-I)\, located in Sardini a\, Italy. To assess the radiopurity of the UAr in terms of Ar-39\, the GA DMC is building the DArTinArDM experiment at the LSC laboratory in Spain. The DArT chamber (~1 liter) containing underground Argon will be placed in the center of the ~1-ton atmospheric argon ArDM detector\, which acts as an active veto for gammas from the detector materials and surrounding rock . DArT is designed to measure the Ar-39 contamination in the UAr with a se nsitivity better than 1 mBq/kg\, ensuring the radiopurity level of the dif ferent UAr batches necessary for DS-20k. \nIn this talk\, I will provide a n overview of the status and prospects of the UAr projects for DarkSide-20 k.\n\nhttps://indico.tlabs.ac.za/event/112/contributions/2900/ LOCATION: Meeting Room 2.61 - 2.63 URL:https://indico.tlabs.ac.za/event/112/contributions/2900/ END:VEVENT END:VCALENDAR