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The application of spiral lenses in electron guns for cathode ray tubes

Authors
Publisher
Technische Universiteit Eindhoven
Publication Date
Keywords
  • Dissertations The And Tu/E
  • Physics: Dissertations
  • Electron And Ion Optics. Electron And Ion Microscopes
  • Cathode-Ray Tubes
  • Electron Lenses
Disciplines
  • Design

Abstract

Spanjer,T.PDF The application of spiral lenses in electron guns for cathode ray tubes PROEFSCHRIFT TER VERKRIJGlNG VAN DE GRAAD VAN DOCTOR AAN DE TECHNISCHE UNIVERSITEIT EINDHOVEN, OP GEZAG VAN DE RECTOR MAGNIFICUS PROF. IR. M. TELS, VOOR EEN COMMISIE AANGEWEZEN DOOR HET COLLEGE V AN DEKANEN IN HET OPENBAAR TE VERDEDIGEN OP VRIJDAG 17 FEBRUARI 1989 TE 14.00 UUR door TJERK GERRIT SPANJER GEBOREN TE RHOON Dit proefschrift is goedgekeurd door de promotoren: Prof.Dr.Ir. H,L. Hagedoorn en Prof.Odr. K.D. van der Mast Copromotor; Dr. W.M. van Alphen The work described in this thesis has been carried out at the Philips Re~ search Laboratories Eindhoven as part of the Philips Research programme. dla mojej iony Ewy i dla moich dzieci Helenki i Kaspra Contents 1 Intl;oduction 1.1 Electron optics 1.2 Lens design .............................. ....... . 1.3 Scope of this thesis .............................. __ 2 A genel;alized compadson of sphedcal aberration of magnetic and 1 I 2 5 electrostatic lenses .••.•••••••••.••••••.•••......•.... 9 2.1 Introduction ..................................... 9 2.2 Theoretical background .... ___ . . . . . . . . . . . . . . . . . . . . .. 10 2.3 Results ......................................... 14 2.4 Discussion and conclusions ...... __ . _ . . . . . . . . . . . . . . . .. 17 3 Optimization of the configuration of spiral lenses for minimum spherical aberration .••...•.....•..••..•••.••....••.•• 18 3.1 Introduction ................. __ . _ . _ .............. 18 3.2 Geometry ....................................... 21 33 The potential distribution within the spiral lens ., ____ . __ . .. 24 3.4 Ray tracing and calculation of the spherical aberration .... _ _ _ 30 3.4.1 Ray tracing in rotationally-symmetric electrical fields .... 30 3.4.2 Spherical aberration ............................. 32 3.5 The optimization procedure ................... _ . ___ .. 35 3.5.1 Formulation

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