Registration Number
0215U002152,
0114U002953
, R & D reports
Title
Participation of NSC KIPT in data processing of experiment of CMS on the Large Hadron Collider in CERN, and as research works on modernization of a hadron calorimetry of the detector CMS
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Head
Levchuk Leonid Gennadievich, Кандидат фізико-математичних наук
Registration Date
05-02-2015
Organization
National Science Center "Kharkiv Institute of Physics and Technology
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The specialized computer system (CS) of NSC KIPT (T2_UA_KIPT T2 center) is an active element of grid-infrastructure of experiment of CMS, working at its 2nd "circle". In 2014 large volume of works on preparation of information infrastructure of CMS by a new season which will begin at the beginning of 2015 in which the Large Hadron Collider (LHC) will work with the design parameters - energy of collision of protons ~ 13-14 TEV and luminosity ~ 1034 cm-2s-1 was executed. General check on the eve of start of a collider of operability of all infrastructure of CMS for data processing - "Computing/software/analysis (CSA) Challenge - 2014" was the major action in experiment of CMS within preparation for the 2nd session the LHC that is carried out in July-September in 2014. Preparation to and ensuring direct participation of T2_UA_KIPT T2 center in it was one of the main zavdann of this project for 2014. This participation defines prospects of the subsequent data processing of experiment of CMS on the T2_UA_KIPT complex in the period of the 2nd session the LHC. Despite of the difficulties caused by a shortcoming (by 1.5-2 times concerning requirements of CMS) computing and disk resources and the insufficient width of a communication channel, it was succeeded to provide high stability and reliability of work of T2 center of T2_UA_KIPT that allowed a complex to take full-scale part in CSA Challenge-2014. As a result of this participation to a complex it was told ~ 100 Terabyte of data of CMS (generally the generate by the Monte-Carlo method of events) that is comparable with annual transfer on a complex of data from a collider in the period of the first session the LHC. Intensity of use of its computing resources since the beginning of 2014 made over 30 thousand khepspec-hours that is one and a half times more, than for previous year. As a result the management of CMS suggested to reckon support of the T2_UA_KIPT complex in 2014. at the level of 9.5 fte-months of works within experiment of CMS that much more, than in previous years, and in general is very high rate. The considerable amount of works was also executed from the physical analysis of the data which are already obtained in experiment by CMS. It is continued search of susy-particles, are studied to the inklyuziyena of the birth? - мезонів in a proton-protonnikh collisions, and also processes Drella-Yana in kinematic area which answers formation of a z-boson, with working off of algorithms of a dekonvolyution of ranges of mass of muonic couples. It is continued works on modernization of face hadron calorimeters (HE) of the detector CMS. The dependence of radiation damage of plastic scintillator on the power of a dose of radiation found earlier which allowed to explain significantly big degradation of a svetovykhod from scintillators in face hadron calorimeters of the detector CMS, in comparison with estimates which were made before start the LHC is confirmed. Radiation of samples of Scsn-81 and Ups-923a scintillators is carried out at rather small (20 крад / hour) dose capacities in pure (99.9%) nitrogen, it is also measured световыход from these samples. Radiation in pure nitrogen didn't lead to any increase of firmness in relation to radiation influence for both types of scintillators. Research of radiation firmness of liquid Ej-309 scintillator which owns high brightness is executed and it is considered perspective option of replacement for Scsn-81. For a portion of Ej-309 isolated from air at radiation to 5 Mrad at rate of 0.16 Mrad / hour, any degradation of a svetovykhod within an error of measurements (±0.03%) isn't recorded. Contact of a surface of scintillator with air in the course of radiation brings to ~ to 2-fold reduction of a svetovykhod.
Product Description
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Бунецький Олег Олегович
Кізка Валерій Олександрович
Кліменко Кім Олександрович
Левчук Леонід Геннадійович
Лук'яненко Сергій Тимофійович
Попов Віктор Пилипович
Приставка Олександр Сергійович
Сорокін Павло Володимирович
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2020-04-02
