Christopher Kullenberg talks on the NOvA Project.
On 26 November the 2017 data taking period ended at the Large Hadron Collideг. In the last two weeks the LHCb detector was involved in experiments on collision of protons with neon atoms. Since neon atoms were not accelerated, their collisions with protons can be treated as bombardments of a fixed target. The process of this kind imitates collisions of high-energy cosmic rays with the upper layers of the Earth’s atmosphere. The new experiment was unique in that two types of collision occurred in the collider, namely, low-energy proton–proton collisions and proton collisions with almost fixed neon atoms. Experimenters discriminated these interactions in the on-line mode by the position of the point from which muons and antimuons escaped. The proton–proton collisions proceeded at the center of the detector, while the proton–neon collisions were shifted by a few tens of centimeters. In 2015 and 2016, similar experiments were conducted at the LHCb by injecting “fixed” helium and argon in the accelerator tube, but joint data gathering from two types of collision was not performed. The LHCb collaboration site reports that now it was the first time that the same detector was used to simultaneously take data on two entirely different collision modes, the collider mode (proton–proton collisions) and the fixed-target mode (proton–neon collisions).
A traditional shutdown of the collider for maintenance and improvements to the detector will last until April 2018.
Our congratulations to Aleksandr Antoshkin who took the second place in the contest “JINR Prize for Young Scientists”, section “Experimental Research”.
A First Look at How the Earth Stops High-Energy Neutrinos in Their Tracks
Neutrinos are abundant subatomic particles that are famous for passing through anything and everything, only very rarely interacting with matter. About 100 trillion neutrinos pass through your body every second. Now, scientists have demonstrated that the Earth stops very energetic neutrinos—they do not go through everything. These high-energy neutrino interactions were seen by the IceCube detector, an array of 5,160 basketball-sized optical sensors deeply encased within a cubic kilometer of very clear Antarctic ice near the South Pole.
IceCube’s sensors do not directly observe neutrinos, but instead measure flashes of blue light, known as Cherenkov radiation, emitted by muons and other fast-moving charged particles, which are created when neutrinos interact with the ice, and by the charged particles produced when the muons interact as they move through the ice. By measuring the light patterns from these interactions in or near the detector array, IceCube can estimate the neutrinos’ directions and energies.
On 11 November 2017, a joint workshop of the DLNP experimenters and LIT specialists was held to discuss the use of JINR computer resources in neutrino experiments conducted by our laboratory.
Oleg Samoilov (DLNP) shared his experience of using LIT clouds in this work. Nilolai Kutovsky (LIT) and Nikita Balashov (LIT) talked about the development of the cloud technologies and their use in the DLNP neutrino programme. The status of the CSNP (Computing Support of Neutrino Programme) initiative group after the year of work was discussed.
A new liquid-cooled server prototype proposed by the IMMERS Company aroused great interest.