Hybrid Version of Method of Moments Computer Code: IBC3D

Focusing properties of a square electrostatic rainbow lens doublet

Nuclear Technology and Radiation Protection ◽

10.2298/ntrp1504239t ◽

2015 ◽

Vol 30 (4) ◽

pp. 239-248 ◽

Cited By ~ 3

Author(s):

Igor Telecki ◽

Petar Belicev ◽

Srdjan Petrovic ◽

Nebojsa Neskovic

Keyword(s):

Kinetic Energy ◽

Method Of Moments ◽

Electrostatic Field ◽

Beam Quality ◽

Optical Element ◽

Computer Code ◽

Angular Distributions ◽

Single Lens ◽

Outer Border ◽

Focusing Properties

This is a study on the properties of a square electrostatic rainbow lens doublet. The said optical element consists of two square electrostatic rainbow lenses with the second lens axially rotated for 45 degrees with respect to the first one. The propagation of a proton beam with a kinetic energy of 10 keV through the doublet is in the focus of our analysis. The potential of the electrodes of both lenses is 2 kV. The electrostatic potential and the electric field components of the lens doublet are calculated using a 3-D computer code based on the method of moments. Spatial and angular distributions of protons propagating through the lens doublet, as well as the parameters defining beam quality, are investigated. As in the case of the single square electrostatic rainbow lens, the evolution of these distributions is determined by the evolution of corresponding rainbow lines, generated by the use of the theory of crystal rainbows. Our study shows that a beam core in the shape of a cusped square is formed by the spatial rainbow line that appears first. This rainbow line occurs during proton propagation through the first lens. The beam core retains the cusped square shape during the propagation through the second lens. The electrostatic field of the second lens causes the appearance of an additional spatial rainbow line, which encompasses the beam core and defines the outer border of the beam. This rainbow line constitutes the main difference between the cases of the lens doublet and a single lens.

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Advances in rib waveguide analysis using the weighted index method or the method of moments

IEE Proceedings J Optoelectronics ◽

10.1049/ip-j.1990.0006 ◽

1990 ◽

Vol 137 (1) ◽

pp. 27 ◽

Cited By ~ 2

Author(s):

P.C. Kendall ◽

M.J. Robertson ◽

P.W.A. McIlroy ◽

S. Ritchie ◽

M.J. Adams

Keyword(s):

Method Of Moments ◽

Index Method ◽

Rib Waveguide ◽

Weighted Index

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The Computational Sublime in Nick Montfort's ‘Round’ and ‘All the Names of God’

CounterText ◽

10.3366/count.2015.0027 ◽

2015 ◽

Vol 1 (3) ◽

pp. 348-365 ◽

Cited By ~ 2

Author(s):

Mario Aquilina

Keyword(s):

Computer Code ◽

Computer Programs ◽

Literary Text ◽

Text Generation ◽

Mathematical Concepts ◽

Literary Space

What if the post-literary also meant that which operates in a literary space (almost) devoid of language as we know it: for instance, a space in which language simply frames the literary or poetic rather than ‘containing’ it? What if the countertextual also meant the (en)countering of literary text with non-textual elements, such as mathematical concepts, or with texts that we would not normally think of as literary, such as computer code? This article addresses these issues in relation to Nick Montfort's #!, a 2014 print collection of poems that presents readers with the output of computer programs as well as the programs themselves, which are designed to operate on principles of text generation regulated by specific constraints. More specifically, it focuses on two works in the collection, ‘Round’ and ‘All the Names of God’, which are read in relation to the notions of the ‘computational sublime’ and the ‘event’.

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