BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Computer modeling of PMT Hamamatsu R11410-20 DTSTART;VALUE=DATE-TIME:20161010T141800Z DTEND;VALUE=DATE-TIME:20161010T143100Z DTSTAMP;VALUE=DATE-TIME:20260814T161321Z UID:indico-contribution-92-781@cern.ch DESCRIPTION:Speakers: Ekaterina Kozlova (NRNU MEPhI)\nA computer model of operation of Hamamatsu R11410-20 photomultiplier based on SPICE software p ackage has been developed. The PMT amplification process is simulated with the use of voltage and current controlled sources of current. Boundaries of linear zone were obtained for high anode current (with respect to the b ase current) operation regime. The results of simulation are in a reasonab le agreement with the experimentally measured characteristics of the PMT w ith serial # KB0278.\n\nThe model can be used for simulation of any type o f PMT.\n\nhttps://indico.particle.mephi.ru/event/4/contributions/781/ LOCATION:Milan Hotel Vivaldi-Boccerini URL:https://indico.particle.mephi.ru/event/4/contributions/781/ END:VEVENT BEGIN:VEVENT SUMMARY:Influence of the photoelectric effect occurring at the PMT first d ynode on the RED-100 detector performance DTSTART;VALUE=DATE-TIME:20161010T140500Z DTEND;VALUE=DATE-TIME:20161010T141800Z DTSTAMP;VALUE=DATE-TIME:20260814T161321Z UID:indico-contribution-92-778@cern.ch DESCRIPTION:Speakers: Yury Melikyan (NRNU MEPhI)\nThe RED-100 two-phase xe non emission detector utilizes Hamamatsu R11410-20 PMTs to detect VUV lumi nescent photons. It was observed\, that the background PMT illumination wi th the luminescent light from cosmogenic muons leads to signal generation at the PMT anode even when the photocathodes are blocked with the help of a dedicated controllable PMT base. We attribute this fact to the photoelec tric effect occurring at the PMT first dynode. Results of quantitative mea surements of its influence on the RED-100 photodetection system performanc e are presented here\, including the estimation of the first dynode’s qu antum efficiency\, which is measured to be ≥9%.\n\nhttps://indico.partic le.mephi.ru/event/4/contributions/778/ LOCATION:Milan Hotel Vivaldi-Boccerini URL:https://indico.particle.mephi.ru/event/4/contributions/778/ END:VEVENT BEGIN:VEVENT SUMMARY:The COHERENT Experiment: CsI Detector DTSTART;VALUE=DATE-TIME:20161010T131300Z DTEND;VALUE=DATE-TIME:20161010T132600Z DTSTAMP;VALUE=DATE-TIME:20260814T161321Z UID:indico-contribution-92-730@cern.ch DESCRIPTION:Speakers: Alexey Konovalov (NRNU MEPhI / MIPT)\nThe COHERENT c ollaboration aims to observe coherent elastic neutrino nuclear scattering (CEvNS) using Ge\, Ar\, NaI and CsI detectors. The latter has completed th e first year of operation at the Spallation Neutron Source located at the Oak Ridge National Laboratory. A description of the CsI detector setup wil l be presented as well as the current detector performance\, related backg rounds and data analysis.\n\nhttps://indico.particle.mephi.ru/event/4/cont ributions/730/ LOCATION:Milan Hotel Vivaldi-Boccerini URL:https://indico.particle.mephi.ru/event/4/contributions/730/ END:VEVENT BEGIN:VEVENT SUMMARY:LIQUID XENON PURIFICATION USING HIGH-VOLTAGE ELECTRIC DISCHARGE TE CHNOLOGY DTSTART;VALUE=DATE-TIME:20161010T135200Z DTEND;VALUE=DATE-TIME:20161010T140500Z DTSTAMP;VALUE=DATE-TIME:20260814T161321Z UID:indico-contribution-92-722@cern.ch DESCRIPTION:Speakers: Alexander Khromov (NRNU MEPhI)\nA very efficient pur ification technology of liquid xenon using a high-voltage discharge betwee n titanium electrodes is described. Lifetime of quasi-free electrons in li quid xenon has been increased from less than 0.1 μs up to more than 50 μ s at electric field strength from ~50 to ~500 V/cm. It was shown that this technology allows to remove even complicated molecular impurities from si gnificant amount of liquid xenon what is quite difficult using standard ge tters. Purified with this method xenon is planned for the use in the RED-1 00 detector for observation of the elastic coherent scattering electron an tineutrino off xenon nuclei.\n\nhttps://indico.particle.mephi.ru/event/4/c ontributions/722/ LOCATION:Milan Hotel Vivaldi-Boccerini URL:https://indico.particle.mephi.ru/event/4/contributions/722/ END:VEVENT BEGIN:VEVENT SUMMARY:Development of the experiment on first observation of elastic cohe rent neutrino-nucleus scattering with liquid argon. DTSTART;VALUE=DATE-TIME:20161010T132600Z DTEND;VALUE=DATE-TIME:20161010T133900Z DTSTAMP;VALUE=DATE-TIME:20260814T161321Z UID:indico-contribution-92-652@cern.ch DESCRIPTION:Speakers: Dmitry Rudik (ITEP and MEPhI)\nThe experimental obse rvation of coherent elastic neutrino-nucleus scattering is one of the most important physical tasks nowadays. The RED collaboration has built a LXe detector “RED-100” for this purpose. An LAr-detector “CENNS-10” is now under construction by COHERENT collaboration. The “RED-100” can b e used with LAr filling after several modifications. The use of different working media allows one to determine parameters of the scattering process more precisely since this effect depends on number of nucleons in nuclei. \nThese both detectors use PMTs as photodetectors. To collect the argon VU V light (128nm) with PMTs wavelength shifters (WLS) must be used. The R&D with different types of WLS (including new type of WLS\, called NOL – na nostructured organic luminofor) is in progress using ITEP test chamber and Monochromator McPherson 234 in Indiana University.\n\nhttps://indico.part icle.mephi.ru/event/4/contributions/652/ LOCATION:Milan Hotel Vivaldi-Boccerini URL:https://indico.particle.mephi.ru/event/4/contributions/652/ END:VEVENT BEGIN:VEVENT SUMMARY:TWO-PHASE EMISSION NOBLE GAS DETECTORS TO SEARCH FOR RARE EVENTS W ITH LOW ENERGY DEPOSITIONS DTSTART;VALUE=DATE-TIME:20161010T124500Z DTEND;VALUE=DATE-TIME:20161010T130000Z DTSTAMP;VALUE=DATE-TIME:20260814T161321Z UID:indico-contribution-92-648@cern.ch DESCRIPTION:Speakers: Alexander Bolozdynya (NRNU MEPhI)\nThis is a review of a technology of two-phase emission detectors using liquid noble gases a s working media. This kind of detectors invented at MEPhI almost 50 years ago is extremely sensitive to ionization (down to single electrons) and ca n be very massive (in ton scale) in order to provide high count rate for q uite rare events and organize an active shielding from natural radioactivi ty in a wall-les configuration of readout system. The emission detectors f ound their unique application in the most sensitive at the moment experime nts searching for cold dark matter in the form of weakly interacting massi ve particles (WIMPs). The last results of this search are reviewed in this paper. The current best limits for the spin-independent interaction of su persymmetric WIMPs having a mass in the range between 5 and 1000 GeV/c2 wi th nucleons were measured with PANDAX-II detector containing 500 kg of liq uid xenon. Emission detectors of the next generation G2\, such as LZ with an active detector mass of 7 tons\, will either unambiguously detect WIMPs or rule out all current theoretical predictions for WIMP existence. Detec tors of the G3 generation of up to 20 ton will be used for multiple purpos es including detection of double beta neutrinoless decay and low-energy ne utrinos using effect of elastic coherent scattering off nuclei. This proce ss is allowed in the Standard Model and was predicted almost 50 years ago\ , but so far has not been observed. This process plays an important role i n the formation of the Universe and the evolution of stars and can be a se nsitive probe of New Physics beyond the Standard Model. Experimental obser vation of the effect is very difficult because of the extremely low energy deposition in a massive detector medium. The review includes a descripti on of the RED-100 two-phase liquid xenon emission detector especially cons tructed to detect the elastic coherent neutrino scattering off xenon nucle i when the detector is installed practically on the Earth's surface.\n\nht tps://indico.particle.mephi.ru/event/4/contributions/648/ LOCATION:Milan Hotel Vivaldi-Boccerini URL:https://indico.particle.mephi.ru/event/4/contributions/648/ END:VEVENT BEGIN:VEVENT SUMMARY:Searching for Dark Matter with NEST and BubXe DTSTART;VALUE=DATE-TIME:20161010T143100Z DTEND;VALUE=DATE-TIME:20161010T144400Z DTSTAMP;VALUE=DATE-TIME:20260814T161321Z UID:indico-contribution-92-629@cern.ch DESCRIPTION:Speakers: Matthew Szydagis (The University at Albany\, State U niversity of New York (SUNY))\nThe past successes and future plans for the NEST semi-empirical simulation model will be discussed. This work was ins trumental in forging the field-dependent signal and background models for use in the LUX results\, while also serving as a robust foundation for det ermining the expected performance of LZ in its technical design report. La stly\, progress on Generation-3 R&D on using superheated xenon at the Univ ersity at Albany will be highlighted with data from a 100-gram-scale proto type (BubXe) focused on also improving existing G2 LZ.\n\nhttps://indico.p article.mephi.ru/event/4/contributions/629/ LOCATION:Milan Hotel Vivaldi-Boccerini URL:https://indico.particle.mephi.ru/event/4/contributions/629/ END:VEVENT BEGIN:VEVENT SUMMARY:The COHERENT Experiment. DTSTART;VALUE=DATE-TIME:20161010T130000Z DTEND;VALUE=DATE-TIME:20161010T131300Z DTSTAMP;VALUE=DATE-TIME:20260814T161321Z UID:indico-contribution-92-524@cern.ch DESCRIPTION:Speakers: Alexander Kumpan (National Research Nuclear Universi ty MEPhI)\nThe COHERENT experiment goals are to detect and study elastic n eutrino-nucleus scattering (CE$\\nu$NS). This process is predicted by Stan dard Model but it has never been observed experimentally because of very l ow energy of recoil nucleus. COHERENT is using different detector technolo gies: germanium detector\, CsI[Na] and NaI scintillator crystals and singl e phase liquid Ar detector. All the detector setups placement is a basemen t of the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory (ORNL). A description of the COHERENT experiment program and technologies used will be presented.\n\nhttps://indico.particle.mephi.ru/event/4/contri butions/524/ LOCATION:Milan Hotel Vivaldi-Boccerini URL:https://indico.particle.mephi.ru/event/4/contributions/524/ END:VEVENT BEGIN:VEVENT SUMMARY:Xenon scintillation response in two-phase emission detector DTSTART;VALUE=DATE-TIME:20161010T133900Z DTEND;VALUE=DATE-TIME:20161010T135200Z DTSTAMP;VALUE=DATE-TIME:20260814T161321Z UID:indico-contribution-92-516@cern.ch DESCRIPTION:Speakers: Anton Lukyashin (ITEP\, MEPhI)\nThe analysis of expe rimental data of the two-phase xenon emission detector has been conducted. There were determined ranges of parameters for neutrons and gamma events\ , using a two-dimensional diagram in isolines. The original method for est imating the deexcitation time of liquid xenon as a working environment of the detector was applied.\n\nhttps://indico.particle.mephi.ru/event/4/cont ributions/516/ LOCATION:Milan Hotel Vivaldi-Boccerini URL:https://indico.particle.mephi.ru/event/4/contributions/516/ END:VEVENT END:VCALENDAR