pencil beam


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Related to pencil beam: Pencil Beam Antenna

pencil beam

See antenna.

pencil beam

[′pen·səl ‚bēm]
(electromagnetism)
A beam of radiant energy concentrated in an approximately conical or cylindrical portion of space of relatively small diameter; this type of beam is used for many revolving navigational lights and radar beams.

pencil beam

An electronic beam that is narrow, has minimal side lobes, and is strongly directional.
References in periodicals archive ?
This clinic is equipped with Mevion S2501 Proton Therapy System with Hyperscan Pencil Beam Scanning.
Users will be able to combine the new functionality with existing features for carbon pencil beam scanning, such as robust 4D biological optimization, deformable registration, dose tracking and adaptive therapy.
3: Calculated yield of [sup.16]N nuclei as a function of Teflon thickness obtained by assuming a neutron pencil beam of [E.sub.n] = 5 MeV.
In this paper, a new algorithm denoted as modified invasive weeds optimization (MIWO) is introduced for the synthesis of both cosecant array pattern and pencil beam pattern of linear array.
The MD Anderson Proton Therapy Center is the pioneer in this technology and also initiated the pencil beam proton therapy, which is also known as scanning beam and intensity modulated proton therapy.
The ChipIR team, led by ISIS project scientist Dr Chris Frost, has found ways to trace a pencil beam of neutrons over a chip, or flood a rack of electronics with neutrons, enabling them to pinpoint vulnerable areas or testing whole systems in operational conditions.
The door features a 'pencil beam' photocell as standard for safety along with a lightweight bottom beam safety edge, and also has a manual override opening facility ensuring optimum safety for pedestrian users.
If a pencil beam is desired, with narrow patterns in both principal planes, a linear array of HMD sources may be employed.
A horizontal slit forms a fan beam that is itself further vignetted by a mechanical chopper wheel, producing a pencil beam that would appear to be swept laterally at a speed determined by the wheel rotational velocity.
Therefore, the traditional pencil beam tunnel covers smaller area than that of the sheet beam, so that the relatively strong electric field beyond the beam channel could not be fully utilized in the beam-wave interaction, and the improvement of the output power is thereby limited.
The desired pencil beam pattern function can be expressed as
Pinchera, "A generalized hybrid approach for the synthesis of uniform amplitude pencil beam ring-arrays," IEEE Transactions on Antennas and Propagation, Vol.