338 research outputs found
Application of software and hardware components of CAN-technology for accelerator control
CAN-technology was developed for embedded hard real time automotive applications. CAN-bus together with
high-level application protocols is used now to control large experimental installations and particle accelerators.
CAN-technology includes fieldbus, universal and specialized controllers, sensors and actuators. Software
components of CAN-technology consist of high level application protocols, programs for testing, monitoring and
configuring of CAN-nodes as well as the components which bind CAN-components with SCADA systems and
ensure control through the WEB-browsers. CAN-technology is used in INP to control accelerators, for beam
diagnostic and, in cooperation with the RRC Kurchatov Institute, in automation of the large neutrino detector
Borexino. CAN-bus adapters for PC have been constructed. Such software components as drivers for PC adapters,
the bus emulator and protocol analyzers have been developed under Linux. Original specialized high level protocols
have been developed for closed specialized systems. Source codes have been developed and verified for
compatibility with international standards such as DeviceNet and CANopen for use in the systems that are supposed
to be extended with commercially available software and hardware components. Long-term positive experience of
CAN-technology usage allows us to recommend this technology for accelerator control especially if industrial style
and compatibility is desired.CAN технологія була розроблена для застосування як убудовану мережу жорсткого реального часу для
автоелектроніки. У НІДЯФ МГУ технологія CAN застосовується для контролю і керування
прискорювачами, діагностики пучка і, разом із РНЦ Курчатовський Інститут, для автоматизації великого
нейтринного детектора Borexino. Багаторічний позитивний досвід роботи з CAN і експлуатація систем
керування з CAN дозволяє рекомендувати цю технологію для побудови систем керування прискорювачами.CAN технология была разработана для применения в качестве встроенной сети жесткого реального
времени для автоэлектроники. В НИИЯФ МГУ технология CAN применяется для контроля и управления
ускорителями, диагностики пучка и, совместно с РНЦ Курчатовский Институт, для автоматизации большого
нейтринного детектора Borexino. Многолетний позитивный опыт работы с CAN и эксплуатация систем
управления с CAN позволяют рекомендовать эту технологию для построения систем управления
ускорителями
Neutrino-induced deuteron disintegration experiment
Cross sections for the disintegration of the deuteron via neutral-current
(NCD) and charged-current (CCD) interactions with reactor antineutrinos are
measured to be 6.08 +/- 0.77 x 10^(-45) cm-sq and 9.83 +/- 2.04 x 10^(-45)
cm-sq per neutrino, respectively, in excellent agreement with current
calculations. Since the experimental NCD value depends upon the CCD value, if
we use the theoretical value for the CCD reaction, we obtain the improved value
of 5.98 +/- 0.54 x 10^(-45) for the NCD cross section. The neutral-current
reaction allows a unique measurement of the isovector-axial vector coupling
constant in the hadronic weak interaction (beta). In the standard model, this
constant is predicted to be exactly 1, independent of the Weinberg angle. We
measure a value of beta^2 = 1.01 +/- 0.16. Using the above improved value for
the NCD cross section, beta^2 becomes 0.99 +/- 0.10.Comment: 22pages, 9 figure
Initial Results from the CHOOZ Long Baseline Reactor Neutrino Oscillation Experiment
Initial results are presented from CHOOZ, a long-baseline reactor-neutrino
vacuum-oscillation experiment. Electron antineutrinos were detected by a liquid
scintillation calorimeter located at a distance of about 1 km. The detector was
constructed in a tunnel protected from cosmic rays by a 300 MWE rock
overburden. This massive shielding strongly reduced potentially troublesome
backgrounds due to cosmic-ray muons, leading to a background rate of about one
event per day, more than an order of magnitude smaller than the observed
neutrino signal. From the statistical agreement between detected and expected
neutrino event rates, we find (at 90% confidence level) no evidence for
neutrino oscillations in the electron antineutrino disappearance mode for the
parameter region given approximately by deltam**2 > 0.9 10**(-3) eV**2 for
maximum mixing and (sin(2 theta)**2) > 0.18 for large deltam**2.Comment: 13 pages, Latex, submitted to Physics Letters
Search for neutrino oscillations on a long base-line at the CHOOZ nuclear power station
This final article about the CHOOZ experiment presents a complete description
of the electron antineutrino source and detector, the calibration methods and
stability checks, the event reconstruction procedures and the Monte Carlo
simulation. The data analysis, systematic effects and the methods used to reach
our conclusions are fully discussed. Some new remarks are presented on the
deduction of the confidence limits and on the correct treatment of systematic
errors.Comment: 41 pages, 59 figures, Latex file, accepted for publication by
Eur.Phys.J.
Limits on Neutrino Oscillations from the CHOOZ Experiment
We present new results based on the entire CHOOZ data sample. We find (at 90%
confidence level) no evidence for neutrino oscillations in the anti_nue
disappearance mode, for the parameter region given by approximately Delta m**2
> 7 x 10**-4 eV^2 for maximum mixing, and sin**2(2 theta) = 0.10 for large
Delta m**2. Lower sensitivity results, based only on the comparison of the
positron spectra from the two different-distance nuclear reactors, are also
presented; these are independent of the absolute normalization of the anti_nue
flux, the cross section, the number of target protons and the detector
efficiencies.Comment: 19 pages, 11 figures, Latex fil
Measurement of the solar 8B neutrino rate with a liquid scintillator target and 3 MeV energy threshold in the Borexino detector
We report the measurement of electron neutrino elastic scattering from 8B
solar neutrinos with 3 MeV energy threshold by the Borexino detector in Gran
Sasso (Italy). The rate of solar neutrino-induced electron scattering events
above this energy in Borexino is 0.217 +- 0.038 (stat) +- 0.008 (syst) cpd/100
t, which corresponds to the equivalent unoscillated flux of (2.4 +- 0.4 (stat)
+- 0.1 (syst))x10^6 cm^-2 s^-1, in good agreement with measurements from SNO
and SuperKamiokaNDE. Assuming the 8B neutrino flux predicted by the high
metallicity Standard Solar Model, the average 8B neutrino survival probability
above 3 MeV is measured to be 0.29+-0.10. The survival probabilities for 7Be
and 8B neutrinos as measured by Borexino differ by 1.9 sigma. These results are
consistent with the prediction of the MSW-LMA solution of a transition in the
solar electron neutrino survival probability between the low energy
vacuum-driven and the high-energy matter-enhanced solar neutrino oscillation
regimes.Comment: 10 pages, 8 figures, 6 table
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