Forward hadron calorimeter at MPD/NICA Golubeva, M; Guber, F; Ivashkin, A ...
Journal of physics. Conference series,
01/2017, Volume:
798, Issue:
1
Journal Article
Peer reviewed
Open access
Forward hadron calorimeter (FHCAL) at MPD/NICA experimental setup is described. The main purpose of the FHCAL is to provide an experimental measurement of a heavy-ion collision centrality (impact ...parameter) and orientation of its reaction plane. Precise event-by-event estimate of these basic observables is crucial for many physics phenomena studies to be performed by the MPD experiment. The simulation results of FHCAL performance are presented.
Relevance.
Among the main factors that determine the productivity of vegetable yields in protected ground, the main one is light. For the formation of 1 kg/m2 of cucumber fruits with a length of ...18-22 cm, on average about 3500-4000 J/cm2 of solar radiation is required. In the winter-spring cycle, in the absence of artificial lighting in greenhouses, there is an unevenness of scattered solar radiation and a general shortage of incoming light energy. At the same time, the amount of total solar radiation required for the formation of a 1 kg of fruit ("lighting price") is not the same for different hybrids. To increase the profitability of production in the winter-spring turnover in greenhouses that are not equipped with artificial lighting, it is necessary to choose hybrids with the lowest "lighting price" of the crop, that is, hybrids that use less light energy to form a 1 kg of fruit.
The purpose of the study
: evaluation of F1 hybrids of cucumber on the basis of resistance to lack of lighting by comparing their "lighting price" of the crop: how much energy is spent on the formation of 1 kg of marketable products.
Methods
. The research was carried out at the variety testing site in the Crimean breeding Center of the Scientific Research Institute of Vegetable Crop Selection "Gavrish", in the conditions of winter-spring turnover, in greenhouses not equipped with artificial lighting. We tested seven medium-fruited (18-22 cm) spined-fruited cucumber hybrids recommended for growing in winter-spring turnover.
Results
. The analysis of the data on the input of solar radiation and the formation of a standard yield showed that there is a direct relationship between the amount of incoming light and the level of productivity. The period of conversion of the received solar energy into the fruit harvest varied during the growing season from 14 to 8 days, depending on the degree of plant development. The "lighting price" of the crop was not the same for different hybrids: the hybrids tested in the experiment spent an average of 2900 J/cm2 per 1 kg of product, which is 18% more efficient than for standard greenhouse cucumbers.
Main properties of the multi-anode microchannel plate photomultiplier to be used in a Cherenkov detector are discussed. The laboratory test results obtained using irradiation of the MCP-PMT ...photocathode by picosecond optical laser pulses with different intensities (from single photon regime to the PMT saturation conditions) are presented.
Relevance
. Obtaining modern cucumber hybrids is impossible without the constant involvement of genetically new sources in the breeding process. One of the most important tasks in the issue of ...creating new heterotic cucumber hybrids is to obtain, and in the future, selection for hybrid crossings, parental lines with the most important economically valuable traits. Research is aimed at obtaining new short-fruited cucumber lines with a smooth type of fruit in order to obtain hybrids with their help that combine resistance to powdery mildew for the “pm” and “pmh” genes, tolerance to the zucchini yellow mosaic virus for the “zymv” genes in combined with high yields, the possibility of growing them not only in unheated film greenhouses, but also in glazed greenhouses.
Methods
. This article presents two schemes for obtaining parental forms using the example of creating four cucumber lines with a short, smooth fruit. Their comparative characteristics and description of new hybrids created with the participation of the studied linear material are carried out. Materials and methods. The main studies were carried out in 2013-2020 on the basis of the Pumpkin Cultures Laboratory of the Krymsk Breeding Center "Gavrish" of the Research Institute of Vegetable Breeding (Krymsk, Krasnodar Territory). The research material is F1 hybrids and selection samples of parthenocarpic cucumber with a smooth type of fruit of various origins (34 samples in total) from the NIISOK collection. The work used traditional methods for assessing selection-significant traits and modern methods of molecular labeling. The purpose of the work is to compare two schemes for obtaining short-fruited cucumber forms, to evaluate the created lines and hybrid combinations with their participation in terms of a complex of economically valuable traits.
Results
. The result of the work was the creation of new hybrid combinations based on the obtained lines, two of which are included in the State Register of Breeding Achievements. These are F1 Ministar (F1 1600/16) and F1 Promini (F1 1995/16).
We report a new measurement of J/ψ, ψ′ and Drell–Yan cross-sections, in the kinematical domain -0.425<ycm<0.575 and -0.5<cosθCS<0.5, performed at the CERN-SPS using 400 GeV/c incident protons on Be, ...Al, Cu, Ag, W and Pb targets. The dependence of the charmonia production cross-sections on the size of the target nucleus allows to quantify the so-called normal nuclear absorption. In the framework of the Glauber model, this new measurement is combined with results previously obtained with the same apparatus, under different experimental conditions, and leads to a precise determination of the J/ψ and ψ′ absorption cross-sections in the surrounding nuclear matter.
Study of nuclear fragmentation at MPD/NICA Golubeva, M.B.; Ivashkin, A.P.; Kurepin, A.B.
EPJ Web of Conferences,
01/2017, Volume:
138
Journal Article, Conference Proceeding
Peer reviewed
Open access
Due to the much lower beam energy of NICA compared to the RHIC and LHC hadron colliders and the fixed target experiments at SPS the role and performance of the forward detectors of NICA are quite ...different. The Neutron Zero Degree Calorimeter could be used for the measurement and monitoring of luminosity, however with lower efficiency of neutron detection produced in ultra-peripheral collisions. The use of Forward Hadron Calorimeter for the determination of centrality is impossible by simply counting the number of spectators because of the ambiguity of the impact parameter dependence. This ambiguity could be removed if the angular distribution of the spectators will be taken into account. It is shown by the simulation with LAQGSM model that the forward multiplicity detector like V0 of ALICE could not be used for the determination of centrality. However it could provide the valuable information on the nuclear fragmentation of heavy ions.
Analysis of fast timing and trigger Cherenkov detector's design for its use in collider experiments is presented. Several specific requirements are taken into account - necessity of the radiator's ...placement as close to the beam pipe as possible along with the requirement of gapless (solid) radiator's design. Characteristics of the Cherenkov detector's laboratory prototype obtained using a pion beam at the CERN Proton Synchrotron are also presented, showing the possibility of obtaining sufficiently high geometrical efficiency along with good enough time resolution (50 ps sigma).
Beam test of FARICH prototype with digital photon counter Barnyakov, A.Yu; Barnyakov, M.Yu; Bobrovnikov, V.S. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
12/2013, Volume:
732
Journal Article
Peer reviewed
In June 2012 we tested a Focusing Aerogel RICH detector prototype based on Digital Photon Counters (DPC) by Philips at the CERN PS T10 beam line with a particle momentum up to 6GeV/c. The prototype ...comprises a 20×20cm2 photon detector with 48×48 DPC pixels. In order to reduce the dark count rate, the photon detector was cooled to −40°C in addition to disabling individual DPC's microcells. A four layer focusing aerogel radiator with 200mm focal distance was studied. We obtained a Cherenkov angle resolution of 3.61±0.04mrad. The mean number of photoelectrons in a ring is 12. Directly measured π/K separation at 6GeV/c momentum is 3.5σ, μ/π separation is 5.3σ at 1GeV/c. A comparison with a Monte Carlo simulation is presented as well.
•Focusing Aerogel RICH prototype with Digital Photon Counters by Philips was built.•The prototype was tested at the CERN PS T10 beam line.•We observed Cherenkov rings with 12 photoelectrons in average.•Timing resolution of DPCs is 48ps for single photons.•Cherenkov angle resolution is 3.64±0.04mrad per ring.
A proposal for an experiment to measure the cross section of antiproton production in a proton-nuclear collision in a kinematically forbidden region for nucleon-nucleon interaction on a fixed LHC ...target is considered. It is shown that this process can be separated from the kinematically allowed production process using the existing detectors of the ALICE facility at a proton energy of 7 TeV with a fixed nuclear target. Assuming the scale dependence of the cross section, the data obtained can be used to estimate the subthreshold cross section for the production of superheavy particles with a mass of several tens of TeV in the LHC lead nucleus beam.
AFTER@LHC is an ambitious fixed-target project in order to address open questions in the domain of proton and neutron spins, Quark Gluon Plasma and high-x physics, at the highest energy ever reached ...in the fixed-target mode. Indeed, thanks to the highly energetic 7 TeV proton and 2.76 A.TeV lead LHC beams, center-of-mass energies as large as see formula in PDF = 115 GeV in pp/pA and see formula in PDF = 72 GeV in AA can be reached, corresponding to an uncharted energy domain between SPS and RHIC. We report two main ways of performing fixed-target collisions at the LHC, both allowing for the usage of one of the existing LHC experiments. In these proceedings, after discussing the projected luminosities considered for one year of data taking at the LHC, we will present a selection of projections for light and heavy-flavour production.
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