SwePub
Sök i SwePub databas

  Utökad sökning

Träfflista för sökning "WFRF:(Wolff M.) "

Sökning: WFRF:(Wolff M.)

  • Resultat 1-10 av 212
Sortera/gruppera träfflistan
   
NumreringReferensOmslagsbildHitta
1.
  •  
2.
  • Fenstermacher, M.E., et al. (författare)
  • DIII-D research advancing the physics basis for optimizing the tokamak approach to fusion energy
  • 2022
  • Ingår i: Nuclear Fusion. - : IOP Publishing. - 0029-5515 .- 1741-4326. ; 62:4
  • Tidskriftsartikel (refereegranskat)abstract
    • DIII-D physics research addresses critical challenges for the operation of ITER and the next generation of fusion energy devices. This is done through a focus on innovations to provide solutions for high performance long pulse operation, coupled with fundamental plasma physics understanding and model validation, to drive scenario development by integrating high performance core and boundary plasmas. Substantial increases in off-axis current drive efficiency from an innovative top launch system for EC power, and in pressure broadening for Alfven eigenmode control from a co-/counter-I p steerable off-axis neutral beam, all improve the prospects for optimization of future long pulse/steady state high performance tokamak operation. Fundamental studies into the modes that drive the evolution of the pedestal pressure profile and electron vs ion heat flux validate predictive models of pedestal recovery after ELMs. Understanding the physics mechanisms of ELM control and density pumpout by 3D magnetic perturbation fields leads to confident predictions for ITER and future devices. Validated modeling of high-Z shattered pellet injection for disruption mitigation, runaway electron dissipation, and techniques for disruption prediction and avoidance including machine learning, give confidence in handling disruptivity for future devices. For the non-nuclear phase of ITER, two actuators are identified to lower the L-H threshold power in hydrogen plasmas. With this physics understanding and suite of capabilities, a high poloidal beta optimized-core scenario with an internal transport barrier that projects nearly to Q = 10 in ITER at ∼8 MA was coupled to a detached divertor, and a near super H-mode optimized-pedestal scenario with co-I p beam injection was coupled to a radiative divertor. The hybrid core scenario was achieved directly, without the need for anomalous current diffusion, using off-axis current drive actuators. Also, a controller to assess proximity to stability limits and regulate β N in the ITER baseline scenario, based on plasma response to probing 3D fields, was demonstrated. Finally, innovative tokamak operation using a negative triangularity shape showed many attractive features for future pilot plant operation.
  •  
3.
  • Barucca, G., et al. (författare)
  • The potential of Λ and Ξ- studies with PANDA at FAIR
  • 2021
  • Ingår i: European Physical Journal A. - : Springer Nature. - 1434-6001 .- 1434-601X. ; 57:4
  • Tidskriftsartikel (refereegranskat)abstract
    • The antiproton experiment PANDA at FAIR is designed to bring hadron physics to a new level in terms of scope, precision and accuracy. In this work, its unique capability for studies of hyperons is outlined. We discuss ground-state hyperons as diagnostic tools to study non-perturbative aspects of the strong interaction, and fundamental symmetries. New simulation studies have been carried out for two benchmark hyperon-antihyperon production channels: p¯ p→ Λ¯ Λ and p¯ p→ Ξ¯ +Ξ-. The results, presented in detail in this paper, show that hyperon-antihyperon pairs from these reactions can be exclusively reconstructed with high efficiency and very low background contamination. In addition, the polarisation and spin correlations have been studied, exploiting the weak, self-analysing decay of hyperons and antihyperons. Two independent approaches to the finite efficiency have been applied and evaluated: one standard multidimensional efficiency correction approach, and one efficiency independent approach. The applicability of the latter was thoroughly evaluated for all channels, beam momenta and observables. The standard method yields good results in all cases, and shows that spin observables can be studied with high precision and accuracy already in the first phase of data taking with PANDA.
  •  
4.
  • 2019
  • Tidskriftsartikel (refereegranskat)
  •  
5.
  • Barucca, G., et al. (författare)
  • Study of excited Ξ baryons with the P¯ ANDA detector
  • 2021
  • Ingår i: European Physical Journal A. - : Springer Nature. - 1434-6001 .- 1434-601X. ; 57:4
  • Tidskriftsartikel (refereegranskat)abstract
    • The study of baryon excitation spectra provides insight into the inner structure of baryons. So far, most of the world-wide efforts have been directed towards N∗ and Δ spectroscopy. Nevertheless, the study of the double and triple strange baryon spectrum provides independent information to the N∗ and Δ spectra. The future antiproton experiment P¯ANDA will provide direct access to final states containing a Ξ¯ Ξ pair, for which production cross sections up to μb are expected in p¯p reactions. With a luminosity of L= 10 31 cm- 2 s- 1 in the first phase of the experiment, the expected cross sections correspond to a production rate of ∼106events/day. With a nearly 4 π detector acceptance, P¯ANDA will thus be a hyperon factory. In this study, reactions of the type p¯p → Ξ¯ +Ξ∗ - as well as p¯p → Ξ¯ ∗ +Ξ- with various decay modes are investigated. For the exclusive reconstruction of the signal events a full decay tree fit is used, resulting in reconstruction efficiencies between 3 and 5%. This allows high statistics data to be collected within a few weeks of data taking.
  •  
6.
  •  
7.
  • Abdo, A. A., et al. (författare)
  • Gamma-ray emission concurrent with the nova in the symbiotic binary V407 cygni
  • 2010
  • Ingår i: Science. - : American Association for the Advancement of Science (AAAS). - 0036-8075 .- 1095-9203. ; 329:5993, s. 817-821
  • Tidskriftsartikel (refereegranskat)abstract
    • Novae are thermonuclear explosions on a white dwarf surface fueled by mass accreted from a companion star. Current physical models posit that shocked expanding gas from the nova shell can produce x-ray emission, but emission at higher energies has not been widely expected. Here, we report the Fermi Large Area Telescope detection of variable γ-ray emission (0.1 to 10 billion electron volts) from the recently detected optical nova of the symbiotic star V407 Cygni. We propose that the material of the nova shell interacts with the dense ambient medium of the red giant primary and that particles can be accelerated effectively to produce π0 decay γ-rays from proton-proton interactions. Emission involving inverse Compton scattering of the red giant radiation is also considered and is not ruled out.
  •  
8.
  • Abdo, A. A., et al. (författare)
  • The second Fermi large area telescope catalog of gamma-ray pulsars
  • 2013
  • Ingår i: Astrophysical Journal Supplement Series. - : American Astronomical Society. - 0067-0049 .- 1538-4365. ; 208:2, s. 17-
  • Tidskriftsartikel (refereegranskat)abstract
    • This catalog summarizes 117 high-confidence ≥0.1 GeV gamma-ray pulsar detections using three years of data acquired by the Large Area Telescope (LAT) on the Fermi satellite. Half are neutron stars discovered using LAT data through periodicity searches in gamma-ray and radio data around LAT unassociated source positions. The 117 pulsars are evenly divided into three groups: millisecond pulsars, young radio-loud pulsars, and young radio-quiet pulsars. We characterize the pulse profiles and energy spectra and derive luminosities when distance information exists. Spectral analysis of the off-peak phase intervals indicates probable pulsar wind nebula emission for four pulsars, and off-peak magnetospheric emission for several young and millisecond pulsars. We compare the gamma-ray properties with those in the radio, optical, and X-ray bands. We provide flux limits for pulsars with no observed gamma-ray emission, highlighting a small number of gamma-faint, radio-loud pulsars. The large, varied gamma-ray pulsar sample constrains emission models. Fermi's selection biases complement those of radio surveys, enhancing comparisons with predicted population distributions.
  •  
9.
  •  
10.
  • Abdo, A. A., et al. (författare)
  • Detection of 16 Gamma-Ray Pulsars Through Blind Frequency Searches Using the Fermi LAT
  • 2009
  • Ingår i: Science. - : American Association for the Advancement of Science (AAAS). - 0036-8075 .- 1095-9203. ; 325:5942, s. 840-844
  • Tidskriftsartikel (refereegranskat)abstract
    • Pulsars are rapidly rotating, highly magnetized neutron stars emitting radiation across the electromagnetic spectrum. Although there are more than 1800 known radio pulsars, until recently only seven were observed to pulse in gamma rays, and these were all discovered at other wavelengths. The Fermi Large Area Telescope (LAT) makes it possible to pinpoint neutron stars through their gamma-ray pulsations. We report the detection of 16 gamma-ray pulsars in blind frequency searches using the LAT. Most of these pulsars are coincident with previously unidentified gamma-ray sources, and many are associated with supernova remnants. Direct detection of gamma-ray pulsars enables studies of emission mechanisms, population statistics, and the energetics of pulsar wind nebulae and supernova remnants.
  •  
Skapa referenser, mejla, bekava och länka
  • Resultat 1-10 av 212
Typ av publikation
tidskriftsartikel (185)
konferensbidrag (18)
forskningsöversikt (7)
rapport (1)
bokkapitel (1)
Typ av innehåll
refereegranskat (189)
övrigt vetenskapligt/konstnärligt (22)
populärvet., debatt m.m. (1)
Författare/redaktör
Fischer, H. (8)
Ohsugi, T. (7)
Winer, B. L. (7)
Longo, F. (7)
Paneque, D. (7)
Torres, D. F. (7)
visa fler...
Bregeon, J. (7)
Lemoine-Goumard, M. (7)
Reimer, A. (7)
Reimer, O. (7)
Tibaldo, L. (7)
de Palma, F. (7)
Kerr, M. (7)
Ajello, M. (7)
Barbiellini, G. (7)
Bellazzini, R. (7)
Bruel, P. (7)
Caliandro, G. A. (7)
Cameron, R. A. (7)
Caraveo, P. A. (7)
Chiang, J. (7)
Ciprini, S. (7)
Cohen-Tanugi, J. (7)
Favuzzi, C. (7)
Fusco, P. (7)
Gargano, F. (7)
Gasparrini, D. (7)
Giglietto, N. (7)
Giordano, F. (7)
Guiriec, S. (7)
Johannesson, G. (7)
Loparco, F. (7)
Lovellette, M. N. (7)
Lubrano, P. (7)
Mazziotta, M. N. (7)
Michelson, P. F. (7)
Mizuno, T. (7)
Monzani, M. E. (7)
Morselli, A. (7)
Nuss, E. (7)
Orlando, E. (7)
Pesce-Rollins, M. (7)
Piron, F. (7)
Porter, T. A. (7)
Raino, S. (7)
Razzano, M. (7)
Siskind, E. J. (7)
Spinelli, P. (7)
Wood, K. S. (7)
Rando, R. (7)
visa färre...
Lärosäte
Karolinska Institutet (104)
Uppsala universitet (24)
Stockholms universitet (23)
Lunds universitet (20)
Göteborgs universitet (18)
Chalmers tekniska högskola (15)
visa fler...
Kungliga Tekniska Högskolan (11)
Linköpings universitet (7)
Umeå universitet (4)
Malmö universitet (4)
Örebro universitet (3)
Högskolan i Halmstad (1)
Linnéuniversitetet (1)
RISE (1)
Karlstads universitet (1)
visa färre...
Språk
Engelska (211)
Odefinierat språk (1)
Forskningsämne (UKÄ/SCB)
Naturvetenskap (62)
Medicin och hälsovetenskap (38)
Teknik (10)
Samhällsvetenskap (8)
Lantbruksvetenskap (2)

År

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy