2,414 research outputs found
Correlations and Fluctuations at RHIC
Particle correlations and fluctuations measured by RHIC experiments at
=130 GeV were discussed. The source size parameters were similar
to those measured at the CERN-SPS, and no long duration time of particle
emission were observed. It was pointed out that the dependences of longitudinal
and transverse radius parameters on the pair momentum are explained with a
single scaling function observed at the SPS energy. Fluctuation studies
of mean of charged particles and of mean in an electromagnetic
calorimeter found no significant non-statistical fluctuations by PHENIX, but
some indication in charge independent by STAR.Comment: 4 pages, 2 figures in eps, talk given at XXXI International Symposium
on Multiparticle Dynamics, Sept 1-7, 2001, Datong China. see
http://ismd31.ccnu.edu.cn
An electronic clock for correlated noise corrections
An inexpensive and portable approach to measure the time an experimental
event occurs as measured by a specific electronic clock is presented. The clock
resets in active synchronization with the experimental AC-power cycle. This
allows an efficient and complete correction for correlated noise contributions
to pulse area and time measurements of detector channels equipped with
PhotoMultiplier Tubes. The electronic board that was developed will be
described. The performance for the treatment of correlated noise in
experimental data taken at the BNL-AGS facility, and analyses of spectral
decompositions of this noise, will also be described.Comment: 15 pages, 11 figures, submitted to Nucl Inst Methods Section A
(8/25/99
A Start-Timing Detector for the Collider Experiment PHENIX at RHIC-BNL
We describe a start-timing detector for the PHENIX experiment at the
relativistic heavy-ion collider RHIC. The role of the detector is to detect a
nuclear collision, provide precise time information with an accuracy of 50ps,
and determine the collision point along the beam direction with a resolution of
a few cm. Technical challenges are that the detector must be operational in a
wide particle-multiplicity range in a high radiation environment and a strong
magnetic field. We present the performance of the prototype and discuss the
final design of the detector.Comment: 12 pages, LaTeX, 9 gif and 4 ps figures. Submitted to NIM
Problems in Trace Analysis of Pesticide Using GC-MS, and Approach towards their Improvements
杉立 久仁代 博士学位論文, 学位授与年月日:2013年3月26日, 学位授与大学: 金沢大学(2012年度) / 金沢大学大学院自然科学研究科 環境科学専攻 環境動態講座 / Doctor thesis of Kuniyo Sugitat
In-beam Tests of a Ring Imaging Cerenkov Detector With a Multianode Photomultiplier Readout
A ring-imaging \v{C}erenkov counter read out by a 100-channel PMT of active
area 1010 cm was operated successfully in a test beam at the BNL
AGS with several radiator gases, including the heavy fluorocarbon
CF. Ring radii were measured for electrons, muons, pions and kaons
over the particle momentum range from 2 to 12 GeV/, and a best resolution of
was obtained.Comment: 11 pages (LaTeX) plus 7 figures in Postscript (gz-compressed and
uuencoded
A threshold imaging Cerenkov detector with CsI photocathodes
A Threshold Imaging Cherenkov (TIC) detector, in conjunction with a tracking device and a time-of-flight system, has been developed to allow pion, kaon and proton identification in the 3--8 GeV/ range of momenta. The system allows spatial identification of the photons of particles above the Cherenkov threshold and their correlation to a particular track. The TIC detector uses a MWPC detector with a CsI coated photocathode for photon conversion. The results obtained in ultrarelativistic lead--lead collisions at the CERN SPS accelerator are presented
Nov sistem za identifikaciju čestica u području 3 − 8 GeV/c
A threshold imaging Cherenkov (TIC) detector, in conjunction with a tracking device, has been developed to allow pion/kaon, proton identification in the 3–8 GeV/c range of momenta. The most important feature of the system is that it allows spatial identification of the photons of particles above the Cherenkov threshold and their correlation to a particular track. The TIC detector uses a MWPC detector with TMAE for photon conversion into electrons. The first results obtained in ultrarelativistic lead–lead collisions at the CERN SPS accelerator are presented. In a recent development use of a solid CsI cathode instead of TMAE has been successfully tested in proton–lead collisions at the CERN SPS.Razvijen je pozicioni detektor fotona Cerenkovljeva zračenja iznad praga emisije (TIC), koji omogućuje (u sklopu sistema za mjerenje tragova čestica) razlikovanje piona od kaona i protona u području između praga emisije za pione i za kaone t.j između 3 i 8 GeV/c. Najbitnija odlika sistema jest mogućnost dvodimenzijske lokalizacije emitiranih fotona i njihovo jednoznačno pridruživanje određenom tragu čestice koji je odreden drugim detektorima. Detektor TIC primjenjuje višezičane proporcionalne komore s TMAE dodanom brojačkom plinu za konverziju fotona u elektrone. Prikazuju se prvi rezultati dobiveni u ultrarelativističkim sudarima iona olova s metom olova u SPS akceleratoru u CERNu. Nedavno je upotreba čvrstih fotokatoda umjesto TMAE bila uspješno iskušana procesima sudara protona s olovom u SPS akceleratoru
Two-Proton Correlations near Midrapidity in p+Pb and S+Pb Collisions at the CERN SPS
Correlations of two protons emitted near midrapidity in p+Pb collisions at
450 GeV/c and S+Pb collisions at 200A GeV/c are presented, as measured by the
NA44 Experiment. The correlation effect, which arises as a result of final
state interactions and Fermi-Dirac statistics, is related to the space-time
characteristics of proton emission. The measured source sizes are smaller than
the size of the target lead nucleus but larger than the sizes of the
projectiles. A dependence on the collision centrality is observed; the source
size increases with decreasing impact parameter. Proton source sizes near
midrapidity appear to be smaller than those of pions in the same interactions.
Quantitative agreement with the results of RQMD (v1.08) simulations is found
for p+Pb collisions. For S+Pb collisions the measured correlation effect is
somewhat weaker than that predicted by the model simulations, implying either a
larger source size or larger contribution of protons from long-lived particle
decays.Comment: 10 pages (LaTeX) text, 4 (EPS) figures; accepted for publication in
Phys. Lett.
Event Reconstruction in the PHENIX Central Arm Spectrometers
The central arm spectrometers for the PHENIX experiment at the Relativistic
Heavy Ion Collider have been designed for the optimization of particle
identification in relativistic heavy ion collisions. The spectrometers present
a challenging environment for event reconstruction due to a very high track
multiplicity in a complicated, focusing, magnetic field. In order to meet this
challenge, nine distinct detector types are integrated for charged particle
tracking, momentum reconstruction, and particle identification. The techniques
which have been developed for the task of event reconstruction are described.Comment: Accepted for publication in Nucl. Instrum. A. 34 pages, 23 figure
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