The Large Hadron Collider (LHC) at CERN smashes protons together at close to the speed of light with seven times the energy of the most powerful accelerators built up to now.
CMS( Compact Muon Solenoid) is a particle detector that is designed to see a wide range of particles and phenomena produced in high-energy collisions in the LHC.
Some of the collision energy is turned into mass, creating new particles
which are observed in the CMS particle detector.
CMS data is analyzed by scientists around the world to build up a picture
of what happened at the heart of the collision and to search for new phenomena that will help to answer questions such as:
What is the Universe really made of and what forces act within it?
And what gives everything substance?
CMS at JINR.
The JINR Grid Sites T1_RU_JINR and T2_RU_JINR are integrated
into the global WLCG (http://wlcg-public.web.cern.ch/,
http://wlcg.web.cern.ch/) infrastructure, meet the requirements
for the center of the 1st level-Tier1 and the 2nd level-Tier2
CMS collaboration at the current stage of this experiment.
In 2017, T2_RU_JINR’s resources for processing power and storage
resources are 47,746 HEP-SPEC06 and 1,489 terabytes, respectively.
The JINR grid site is actively used by the CMS collaboration:
From January 2008 to July 2017, 7,104,735 jobs of the
virtual organization CMS were launched on the T2_RU_JINR site of the JINR.
Statistics on Tier2 and Tier1 JINR: http://rocmon.jinr.ru:8080/
The functionality of the VOBOX Grid Service for CMS is provided and
supported at JINR:
- The Phedex server is installed and periodically updated, which is necessary for transferring data between the CMS grid sites via the FTS grid service.
- Configure and use the proxy server SQUID, which is necessary when working with specialized CMS databases (conditions DB).
Certification of CMS T2-network CMS network connections with
all CMS-sites of the 1-st level with the required data transfer rate
was carried out:
20 megabytes / sec – from CMS-centers of Tier1 level to JINR and
5 megabytes / sec – from JINR to CMS-centers of Tier1 level,
as well as with most CMS-centers of the 2nd level
(requirements for certification of these links in both directions-
5 megabytes per second).
Regularly (almost daily) on the site T2_RU_JINR, a mass launch of typical CMS tasks is performed using the HammerCloud test system:
http://hammercloud.cern.ch/hc/app/cms/
http://hammercloud.cern.ch/hc/app/cms/robot/historical/.
JINR participates in the mass Monte Carlo simulations of physical
events through physical channels of interest to JINR physicists within
the framework of sessions of the planned generation of physical events
in the CMS collaboration.
The CMS data is also replicated to the mass storage system of the
JINR website in accordance with the needs of JINR physicists participating in the CMS experiment.
By July 2017, the total amount of CMS data on the T2_RU_JINR grid site was about 694 terabytes.