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Retardation in Special Relativity and the Design of a Relativistic Motor

100%

Yahalom A.

Acta Physica Polonica A

2017

vol. 131

issue 5

1285-1288

The Newton third law states that any action is countered by a reaction of equal magnitude but opposite direction. The total force in a system not affected by external forces is thus zero. However, according to the principles of relativity, a signal cannot propagate at speeds exceeding the speed of light. Thus the total force cannot be null at a given time. The above conclusion leads to the possibility of a relativistic engine in particular one that is based on a permanent magnet. The analysis is based on a previous paper in which we studied the relativistic effects in a system of two current conducting loops.

Design of a Permanent Magnet Wiggler for a THz Free Electron Laser

51%

Balal N., Magori E., Yahalom A.

Acta Physica Polonica A

2015

vol. 128

issue 3

259-263

A THz free electron laser is being built in Ariel University. Upon completion it is intended to become a user facility. The free electron laser is designed to emit radiation between 1 and 5 THz. It is planned to operate in the super radiance regime. The anticipated output of the free electron laser is in excess of 150 kW instantaneous power. An essential part of every free electron laser is a device generating a periodic magnetic field denoting the wiggler. Here we describe a design of a classical Halbach type permanent magnetic wiggler for the THz free electron laser. The main novelty in this paper is the choice of wiggler parameters suitable for operation in the THz frequency range. Considerations such as radiation wave length, wiggler gain and electron optics are taken into account.

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2 Acta Physica Polonica A

1 2017

1 2015

2 Yahalom A.

1 Balal N.

1 Magori E.

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Retardation in Special Relativity and the Design of a Relativistic Motor

Design of a Permanent Magnet Wiggler for a THz Free Electron Laser