BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:Thermosyphon cryogenic system for RED-100 detector DTSTART;VALUE=DATE-TIME:20151007T130000Z DTEND;VALUE=DATE-TIME:20151007T131500Z DTSTAMP;VALUE=DATE-TIME:20260309T214822Z UID:indico-contribution-60-434@cern.ch DESCRIPTION:Speakers: Aleksey Shakirov (MEPhI)\nA cryogenic system based o n a two-phase closed tubular thermosyphon with 12 mm diameter copper tube is developed. It was used for thermal stabilization of the liquid xenon em ission detector RED-100. The nitrogen refrigerant cooled down with a free- boiling liquid nitrogen bath has been used. It was shown that the system s upports the RED100 operation at temperature 166 K with accuracy ±1К.\n\n https://indico.particle.mephi.ru/event/2/contributions/434/ LOCATION:Milan Hotel 4* Verdi URL:https://indico.particle.mephi.ru/event/2/contributions/434/ END:VEVENT BEGIN:VEVENT SUMMARY:New method of Kr-85 reduction in low-background detectors. DTSTART;VALUE=DATE-TIME:20151007T123000Z DTEND;VALUE=DATE-TIME:20151007T124500Z DTSTAMP;VALUE=DATE-TIME:20260309T214822Z UID:indico-contribution-60-354@cern.ch DESCRIPTION:Speakers: Dmitry Akimov (ITEP and MEPhI)\, Grigory Simakov (IT EP)\nKrypton-85 is a technogenic beta-radioactive isotope which produces b ackground in a low-energy region in dark matter and neutrino detectors: in noble gas detectors\, especially in liquid Xenon detectors\, in organic l iquid scintillator detectors.\nWe propose a new method of reduction of the 85Kr isotope in a detector medium based on adding to the detector medium a Krypton sample depleted of the 85Kr isotope and subsequent reduction of the Kr content down to the initial or even lower level with the use of exi sting methods of purification. This method works because the residual natu ral Kr is diluted in the depleted one and is removed together with it from Xe since both of them have the same thermodynamic properties.\nA test cel l for measurement of the activity of the depleted Kr has been assembled an d the radioactivity of the 25-year-old Krypton has been measured. The meas ured activity (56 ± 5 Bq/g) recalculated to the air the air activity due to 85Kr decays in the year 1990 (1.20 ± 0.10 Bq/m3) is close to the data on the air activity at that time.\n\nhttps://indico.particle.mephi.ru/even t/2/contributions/354/ LOCATION:Milan Hotel 4* Verdi URL:https://indico.particle.mephi.ru/event/2/contributions/354/ END:VEVENT BEGIN:VEVENT SUMMARY:Study of electron emission in a two-phase xenon detector DTSTART;VALUE=DATE-TIME:20151007T124500Z DTEND;VALUE=DATE-TIME:20151007T130000Z DTSTAMP;VALUE=DATE-TIME:20260309T214822Z UID:indico-contribution-60-352@cern.ch DESCRIPTION:Speakers: Alexey Konovalov (MEPhI/ITEP)\nWe describe basic pri nciples of electron emission in two-phase xenon and discuss possible ways of spontaneous electron emission. We present a brief summary of experiment al results connected to single electron emission including the recent one obtained by the authors. The results of study seem to confirm the hypothes is\, that single electron signals originate from the cloud of ionization e lectrons localised under the liquid-gas interface.\n\nhttps://indico.parti cle.mephi.ru/event/2/contributions/352/ LOCATION:Milan Hotel 4* Verdi URL:https://indico.particle.mephi.ru/event/2/contributions/352/ END:VEVENT BEGIN:VEVENT SUMMARY:Study of the low-background Hamamatsu R11410-20 cryogenic PMTs for the RED100 detector DTSTART;VALUE=DATE-TIME:20151007T131500Z DTEND;VALUE=DATE-TIME:20151007T133000Z DTSTAMP;VALUE=DATE-TIME:20260309T214822Z UID:indico-contribution-60-306@cern.ch DESCRIPTION:Speakers: Yury Melikyan (NRNU MEPhI)\nThe two-phase cryogenic xenon emission detector RED100 is planned to be equipped by 38 Hamamatsu R 11410-20 photomultiplier tubes\, which are claimed to be operable at cryog enic temperatures and made of extremely low background materials.\nA thoro ugh characterization procedure has been carried out for each PMT unit to b e installed to the detector. The main results obtained are presented here\ , including the single photoelectron spectra parameters\, a set of gain-re presenting curves for a wide range of the bias voltage values\, typical am plitude integral spectrum of the PMT’s dark count rate and the distribut ion of 34 PMT samples through their dark count rate for equal gain values. Peculiar characteristics of several PMT units are further discussed and e xplained.\n\nhttps://indico.particle.mephi.ru/event/2/contributions/306/ LOCATION:Milan Hotel 4* Verdi URL:https://indico.particle.mephi.ru/event/2/contributions/306/ END:VEVENT BEGIN:VEVENT SUMMARY:Data acquisition system based on fast waveform digitizer for large neutrino detectors DTSTART;VALUE=DATE-TIME:20151007T120000Z DTEND;VALUE=DATE-TIME:20151007T121500Z DTSTAMP;VALUE=DATE-TIME:20260309T214822Z UID:indico-contribution-60-303@cern.ch DESCRIPTION:Speakers: Georgy Lukyanchenko (NRC Kurchatov Institute)\nFor l arge volume neutrino and antineutrino detectors it is crucial to have an e fficient data acquisition system capable of digitizing data from thousands of detection channels. Here we present a flexible DAQ system architecture consisting of large number of fast waveform digitizers and configurable F PGA-based trigger logic. Current implementation of the system is functioni ng in the Borexino detector providing zero dead time spectroscopy data in energy range from 1 up to 100 MeV. Acquisition complex in combination with our custom analysis software is successfully being used for registration of geoneutrinos\, as well as search for neutrino signal from GRBs\, solar netrino spectroscopy and other aplications.\n\nhttps://indico.particle.mep hi.ru/event/2/contributions/303/ LOCATION:Milan Hotel 4* Verdi URL:https://indico.particle.mephi.ru/event/2/contributions/303/ END:VEVENT BEGIN:VEVENT SUMMARY:Digital trigger system for the RED-100 detector based on the unit in VME standard DTSTART;VALUE=DATE-TIME:20151007T121500Z DTEND;VALUE=DATE-TIME:20151007T123000Z DTSTAMP;VALUE=DATE-TIME:20260309T214822Z UID:indico-contribution-60-289@cern.ch DESCRIPTION:Speakers: Pavel Naumov (MEPhI)\nThe system for forming a trigg er for the RED-100 liquid xenon detector has been developed. The trigger c an be generated for all types of events required to calibrate the detector and data acquisition\, including events with one ionization electron. The system has an event detection mechanism where each event is assigned with the timestamp and event type. The trigger system is required in the syste ms searching for rare events to keep only the necessary information from t he ADC array. The characteristics and implementation of the trigger system that provides high efficiency operation even at low-energy events have be en described.\n\nhttps://indico.particle.mephi.ru/event/2/contributions/28 9/ LOCATION:Milan Hotel 4* Verdi URL:https://indico.particle.mephi.ru/event/2/contributions/289/ END:VEVENT END:VCALENDAR