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P. Abreu
Instituto Superior Técnico
724Publications
44H-index
11.1kCitations
Publications 724
Newest
P. Homola28
Estimated H-index: 28
(University of Leeds),
F. Contreras29
Estimated H-index: 29
+ 390 AuthorsM. Giammarchi38
Estimated H-index: 38
Data taken at the Pierre Auger Observatory are used to search for air showers initiated by ultra-high energy (UHE) photons. Results of searches are reported from hybrid observations where events are measured with both fluorescence and array detectors. Addition- ally, a more stringent test of the photon fluxes predicted with energies above 10 19 eV is made using a larger data set measured using only the surface detectors of the observatory.
9 Citations Source Cite
Published on Jan 1, 2018in Nuclear Fusion 4.06
D. Keeling1
Estimated H-index: 1
(Culham Centre for Fusion Energy),
C.D. Challis1
Estimated H-index: 1
(Culham Centre for Fusion Energy)
+ 1221 AuthorsM. Abhangi3
Estimated H-index: 3
Experiments have been carried out on the MAST and JET tokamaks intended to compare the electrical resistivity of the plasma with theoretical formulations. The tests consist of obtaining motional stark effect (MSE) measurements in MHD-free plasmas during plasma current ramp-up (JET and MAST), ramp-down (MAST) and in stationary state (JET and MAST). Simulations of these plasmas are then performed in which the current profile evolution is calculated according to the poloidal field diffusion equatio...
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Published on Apr 1, 2018in European Physical Journal C 5.17
P. Abreu44
Estimated H-index: 44
,
S. Andringa27
Estimated H-index: 27
+ 42 AuthorsG. Cernicchiaro
A new concept for the direct measurement of muons in air showers is presented. The concept is based on resistive plate chambers (RPCs), which can directly measure muons with very good space and time resolution. The muon detector is shielded by placing it under another detector able to absorb and measure the electromagnetic component of the showers such as a water-Cherenkov detector, commonly used in air shower arrays. The combination of the two detectors in a single, compact detector unit provid...
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Published on Feb 2, 2018in The Astrophysical Journal 6.63
A. Aab6
Estimated H-index: 6
(Radboud University Nijmegen),
P. Abreu44
Estimated H-index: 44
(University of Lisbon)
+ 14 AuthorsH. Falcke7
Estimated H-index: 7
(Radboud University Nijmegen)
A new analysis of the data set from the Pierre Auger Observatory provides evidence for anisotropy in the arrival directions of ultra-high-energy cosmic rays on an intermediate angular scale, which is indicative of excess arrivals from strong, nearby sources. The data consist of 5514 events above 20 EeV with zenith angles up to 80 degrees. recorded before 2017 April 30. Sky models have been created for two distinct populations of extragalactic gamma-ray emitters: active galactic nuclei from the s...
14 Citations Source Cite
Published on Feb 15, 2018in Nuclear Fusion 4.06
A. Murari4
Estimated H-index: 4
(University of Padua),
M. Lungaroni4
Estimated H-index: 4
(University of Rome Tor Vergata)
+ 1219 AuthorsS. Abduallev2
Estimated H-index: 2
Detecting disruptions with sufficient anticipation time is essential to undertake any form of remedial strategy, mitigation or avoidance. Traditional predictors based on machine learning techniques can be very performing, if properly optimised, but do not provide a natural estimate of the quality of their outputs and they typically age very quickly. In this paper a new set of tools, based on probabilistic extensions of support vector machines (SVM), are introduced and applied for the first time ...
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Published on Apr 1, 2018in Fusion Engineering and Design 1.44
G. Calabrò8
Estimated H-index: 8
,
F. Maviglia14
Estimated H-index: 14
+ 1219 AuthorsK. M. Aggarwal14
Estimated H-index: 14
Abstract This paper deals with a divertor coil currents optimized procedure to design High Flux Expansion (HFE) configurations in the JET tokamak aimed to study the effects of flux expansion variation on the radiation fraction and radiated power re-distribution. A number of benefits of HFE configuration have been experimentally demonstrated on TCV, EAST, NSTX and DIII-D tokamaks and are under investigation for next generation devices, as DEMO and DTT. The procedure proposed here exploits the lin...
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Published on Jul 1, 2018in Contributions To Plasma Physics 1.32
R. Zagorski6
Estimated H-index: 6
,
A. Czarnecka8
Estimated H-index: 8
+ 1220 AuthorsK. M. Aggarwal14
Estimated H-index: 14
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Published on Aug 1, 2018in Nuclear Fusion 4.06
S. E. Sharapov9
Estimated H-index: 9
,
H. J. C. Oliver + 1221 AuthorsM. Afzal3
Estimated H-index: 3
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Published on Aug 1, 2018in Nuclear Fusion 4.06
F. Nabais7
Estimated H-index: 7
,
V. Aslanyan2
Estimated H-index: 2
+ 1220 AuthorsJ. Mailloux19
Estimated H-index: 19
1 Citations Source Cite
Published on Aug 1, 2018in Plasma Physics and Controlled Fusion 3.03
C. Silva23
Estimated H-index: 23
,
J. Hillesheim10
Estimated H-index: 10
+ 1221 AuthorsP. Abreu44
Estimated H-index: 44
1 Citations Source Cite
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