نتایج جستجو برای: photon contamination electron beams magnetic field simulation

تعداد نتایج: 1914707  

2002

The IAEA Code of Practice for Absorbed Dose Determination in Photon and Electron Beams TRS 277 gives recommendations for the absorbed dose determination in high energy photon and electron beams based on the use of ionization chambers calibrated in terms of air kerma. It was the task of the present work to test the validity of the Code for *°Co gamma radiation for ton different types of ionizati...

1999
Murray A. Moinester Victor Steiner Serguei Prakhov

The CERN COMPASS experiment will investigate hadron-photon interactions, to achieve a unique Primakoff Coulomb physics program based on hadron polarizability, hybrid mesons, chiral anomaly, and meson radiative transition studies. In COMPASS, pion (kaon) polarizabilities and radiative transitions will be measured via dedicated Primakoff effect reactions such as πγ → π ′ γ and πγ → M (meson). We ...

Journal: :Physical review letters 2017
Koen van Kruining Armen G Hayrapetyan Jörg B Götte

We present a relativistic description of electron vortex beams in a homogeneous magnetic field. Including spin from the beginning reveals that spin-polarized electron vortex beams have a complicated azimuthal current structure, containing small rings of counterrotating current between rings of stronger corotating current. Contrary to many other problems in relativistic quantum mechanics, there ...

2008
M. V. Chistyakov N. V. Mikheev

Damping of an electromagnetic wave in a strong magnetic field is analyzed in the kinematic region near the threshold of electron-positron pair production. Damping of the electromagnetic field is shown to be noticeably nonexponential in this region. The resulting width of the photon γ → e+e− decay is considerably smaller than previously known results. PACS numbers: 13.40.Hq; 95.30.Cq E-mail addr...

2012
Xuedong Hu Yu-xi Liu Franco Nori

We study electron-spin-photon coupling in a single-spin double quantum dot embedded in a superconducting stripline cavity. With an external magnetic field, we show that either a spin-orbit interaction (for InAs) or an inhomogeneous magnetic field (for Si and GaAs) could produce a strong spin-photon coupling, with a coupling strength of the order of 1 MHz. With an isotopically purified Si double...

2010
A V Sobol D L Bruhwiler G I Bell A Fedotov V Litvinenko

The orders-of-magnitude higher luminosities required by future electron–ion collider concepts require a dissipative force to counteract the numerous factors acting to gradually increase the phase space volume of relativistic ion beams. High-energy electron cooling systems could provide the necessary dissipation via dynamical friction, but will have to be designed for new parameter regimes. It i...

2013
Tamader Y. AL-Rammah H. I. Al-Mohammed F. H. Mahyoub

Metal oxide semiconductor field effect transistor (MOSFET) detectors have recently been introduced to radiation therapy. However, the response of these detectors is known to vary with dose rate. Therefore, it is important to evaluate how much variation between the treatment prescribed dose and the dose that is actually delivered to the patient using high-energy photon or electron beams under co...

2017
Dmitri Kharzeev Kirill Tuchin

We argue that long-range photon-photon attraction induced by the dipole interaction of two electron-positron loops can lead to "vacuum self-focusing" of very intense laser beams. The focusing angle Î ̧F is found to increase with the beam intensity I as Î ̧F âˆ1⁄4 I4/3; for the laser beams available at present or in the near future, Î ̧F 10-10 10-7.

2008
V. Génot P. Louarn

Investigating the process of electron acceleration in auroral regions, we present a study of the temporal evolution of the interaction of Alfvén waves (AW) with a plasma inhomogeneous in a direction transverse to the static magnetic field. This type of inhomogeneity is typical of the density cavities extended along the magnetic field in auroral acceleration regions. We use self-consistent Parti...

2005
V. I. Telnov

For removal of disrupted beams at the ILC linear ee collider it is desirable to collide beams at some crossing angle. An especially large crossing angle, of about 25 mrad, is necessary for the photon collider, where disrupted beams are softer and wider than in the ee case. Some complications arise due to the solenoidal magnetic field of the detector. Radiation of particles in this field can inc...

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