2,277 research outputs found
Exclusive Jet Measurement in Special LHC Runs - Feasibility Studies
The feasibility studies of the central exclusive jet production at the LHC
using the proton tagging technique are presented. Three classes of data taking
scenarios are considered: double tag at high pile-up, single tag at low pile-up
and double tag at low pile-up. Analyses were performed at the c.m. energy of 14
TeV for the ATLAS experiment, but are also valid for the CMS/TOTEM detectors.Comment: Presented at XXII Cracow Epiphany Conferenc
Machine Optics Studies for the LHC Measurements
In this work the properties of scattered protons in the vicinity of the ATLAS
Interaction Point (IP1) for various LHC optics settings are discussed. Firstly,
the beam elements installed around IP1 are presented. Then the ATLAS forward
detector systems: Absolute Luminosity For ATLAS (ALFA) and ATLAS Forward
Protons (AFP) are described and their similarities and differences are
discussed. Next, the various optics used at Large Hadron Collider (LHC) are
described and the beam divergence and width at the Interaction Point as well as
at the ATLAS forward detectors locations are calculated. Finally, the geometric
acceptance of the ATLAS forward detectors is shown and the impact of the LHC
collimators on it is discussed.Comment: 15 pages, 10 figure
SphinX soft X-ray spectrophotometer: Science objectives, design and performance
The goals and construction details of a new design Polish-led X-ray spectrophotometer are described. The instrument is aimed to observe emission from entire solar corona and is placed as a separate block within the Russian TESIS X- and EUV complex aboard the CORONAS-PHOTON solar orbiting observatory. SphinX uses silicon PIN diode detectors for high time resolution measurements of the solar spectra in the range 0.8–15 keV. Its spectral resolution allows for discerning more than hundred separate energy bands in this range. The instrument dynamic range extends two orders of magnitude below and above these representative for GOES. The relative and absolute accuracy of spectral measurements is expected to be better than few percent, as follows from extensive ground laboratory calibrations
SphinX: The Solar Photometer in X-Rays
Solar Photometer in X-rays (SphinX) was a spectrophotometer developed to observe the Sun in soft X-rays. The instrument observed in the energy range ≈ 1 - 15 keV with resolution ≈ 0.4 keV. SphinX was flown on the Russian CORONAS-PHOTON satellite placed inside the TESIS EUV and X telescope assembly. The spacecraft launch took place on 30 January 2009 at 13:30 UT at the Plesetsk Cosmodrome in Russia. The SphinX experiment mission began a couple of weeks later on 20 February 2009 when the first telemetry dumps were received. The mission ended nine months later on 29 November 2009 when data transmission was terminated. SphinX provided an excellent set of observations during very low solar activity. This was indeed the period in which solar activity dropped to the lowest level observed in X-rays ever. The SphinX instrument design, construction, and operation principle are described. Information on SphinX data repositories, dissemination methods, format, and calibration is given together with general recommendations for data users. Scientific research areas in which SphinX data find application are reviewed
Single hadron response measurement and calorimeter jet energy scale uncertainty with the ATLAS detector at the LHC
The uncertainty on the calorimeter energy response to jets of particles is
derived for the ATLAS experiment at the Large Hadron Collider (LHC). First, the
calorimeter response to single isolated charged hadrons is measured and
compared to the Monte Carlo simulation using proton-proton collisions at
centre-of-mass energies of sqrt(s) = 900 GeV and 7 TeV collected during 2009
and 2010. Then, using the decay of K_s and Lambda particles, the calorimeter
response to specific types of particles (positively and negatively charged
pions, protons, and anti-protons) is measured and compared to the Monte Carlo
predictions. Finally, the jet energy scale uncertainty is determined by
propagating the response uncertainty for single charged and neutral particles
to jets. The response uncertainty is 2-5% for central isolated hadrons and 1-3%
for the final calorimeter jet energy scale.Comment: 24 pages plus author list (36 pages total), 23 figures, 1 table,
submitted to European Physical Journal
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