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An accelerated charge emits radiation, as taught in our course Electromagnetism and Electrodynamics.
But, how does the electric field of an accelerated charge exactly looks like?
The analytic solution for the electric field in space and time is quite complex. One typically presents approximate solutions close to the charge (near field) and far from the charge (far field). In the Computational Physics course we derive a short numerical scheme, which provides the exact solution for the field in space and time, for any velocity including relativistic.
The first video shows a charge moving in a circle at a speed of 10% of the speed
the light. The solution is similar to the electrostatic solution of a radial field of a charge with a time variable position (the quasi static approximation for the near field).
In the second video the speed of the charge increases to 50% of the speed of light. A tangential field now appears clearly, moving away at the speed of light from the charge. This is the radiation field (approximated by the far field). Note that very close to the charge the field remains quasi static. This radiation is produced in nature by electrons moving in a magnetic field, and is called cyclotron radiation.
In the third video, the speed of the charge increases to 90% of the speed of light. A relativistic effect now leads to radiation emitted into a narrow beam. This is synchrotron radiation, produced by relativistic electrons in a magnetic field. This radiation is produced by a great variety of sources in the Universe.
Thanks to Ayal Beck, a student in the Computational Physics course, for preparing the videos
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On May 2nd we held a Physics Research Day during which the faculty members gave short lectures exhibiting their research to students, and after which the graduate students presented posters of their latest research. 4 students were chosen to present their work in the Technion poster competition.
- Alon Yagil - Diamagnetic Vortex Barrier Stripes in Underdoped BaFe2(As1-xPx)2,
- Roni Gofman - A Mixed Helium-Oxygen Shell in some Core-Collapse Supernova Progenitors,
- Ofer Neufeld - Group Theory for Harmonic Generation,
- Boris Timchencko - Out-of-Equilibrium Quantum Radiation and Atomic Motion.
Tom Shindelman, a bachelor student who will begin her physics graduate studies in the fall, shared “The faculty members explained their research to us as equals and encouraged graduate studies. In addition, it was interesting to learn about the research conducted by the students in the faculty. Aldana Grichener, a bachelor student who presented a poster as part of her research project in astrophysics, added “the faculty research day created a sense of belonging. I was given the opportunity to present my work in front of my fellow students and answer their questions. I hope I was able to “infect” them with my enthusiasm and love for physics.” Dean of the physics department Ehud Behar summarized “We enjoyed taking part in a celebration of research, bringing together professors, research students and future students from the Technion and from other universities. A variety of research areas were presented, and the graduate students shared their exciting new work with the participants.”
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Prof. Adi Nusser talks in "Shlosha Sheyodim" program
KanTarbut radio station
Israeli Broadcasting Corporation
14.05.18
(for listening skip to 36:06)
Listen also on "Kan" website
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Our Ph.D student Eran Lustig, instructed by Prof. Moti Segev, won a Adams scholarship 2018-2019
Congratulations Eran!
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Our M.Sc student Roy Rabaglia, instructed by Prof. Yariv Kafri, won a Ruth and Arrigo Finzi scholarship 2017-2018
Congratulations Roy!
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Haaretz interview with Prof. Lisa Randall (Harvard) following her public lecture at IPS2017 and visit to the department, describing Randall's work on dark matter and warped extra dimensions. Also interviewed is Prof. Yael Shadmi.
