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1.
  • Bilato, A., et al. (författare)
  • Impact of ICRF fast-ions on core turbulence and MHD activity in ASDEX upgrade
  • 2023
  • Ingår i: 24th Topical Conference On Radio-Frequency Power In Plasmas. - : AIP Publishing.
  • Konferensbidrag (refereegranskat)abstract
    • Experiments in various tokamaks and their analysis identify the fast ions (FI) generated by NBI and/or ICRF heating as one of the main causes of the observed improvement in core confinement: fast ions can reduce core microturbulence (mainly Ion-Temperature-Gradient (ITG) driven modes) either electrostatically or electromagnetically, or they can resonate with fishbones and high-frequency Alfvén modes, which in turn contribute in stabilizing ITG. In this perspective, we discuss recent experiments done on ASDEX Upgrade (AUG) where ICRF is the main actuator for FI generation for energies above 100 keV. Additionally, ICRF-FIs can substantially impact the MHD activity and its consequent effects on fast ion losses (FILs) and ion-cyclotron emission (ICE). We present dedicated AUG experiments with NBI-D further accelerated by ICRF.
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2.
  • Brenner, Richard, et al. (författare)
  • The ATLAS tau trigger and planned trigger efficiency studies with early data
  • 2009
  • Ingår i: Proceedings of CHarged2008. - Trieste : Proceedings of Science. ; , s. 1-7
  • Konferensbidrag (refereegranskat)abstract
    • The tau trigger system of the ATLAS detector has been developed to increase the sensitivity ofthe detector to the Higgs boson and searches for physics beyond the Standard Model.  A trigger system split in three levels has been designed for hadronically decaying tau leptons optimized for efficiency and good background rejection.  At the first level the trigger uses only information from the calorimeters while the other two levels include also information from the tracking.  Both energy and shape variables for the hadronic tau jets are used in the trigger algorithms.  The very intense QCD background, however, makes it a challenge to develop an efficient trigger with high purity at low transverse momentum. Thus the tau trigger is best used in combination with other trigger variables such as missing transverse energy or jets.  Before the tau trigger can be used in searches, it has to be commissioned with data and the efficiency and background rejectionof QCD has to be studied in detail.
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  • Resultat 1-4 av 4

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