Optical properties

Finally, we estimate the optical properties of the deflector. Because there is no lens in the project, we can either do ray tracing, or we can calculate the optical properties as deflection slope and aberration coefficients.

Deflected trajectory

Aberrations

Trace file: D:\TU-EOD1\testuj\edefl\aberrations.EODtrc
Integration method Runge-Kutta Fehlberg 4-5 order
Max. step size  =   0.10000000     mm
Axial fields interpolation: cubic spline
Relativistic correction: off
Particle electron, charge -1e
 -----------------------------------------------
 Aberrations calculation results
 -----------------------------------------------
 Fields used for tracing
 Fields:
 1 .\dem1emd-20-1357.EODinp
   Electrostatic deflector - field
      main deflector
      Field is symmetrical
     Interpolation Cubic spline
     Field zmin (original) -60.000000000 mm
     Field zmax (original) 60.0000000000 mm
     Field magnitude       1.00000000000
     Field z shift         0.00000000000 mm
     Field rotation        0.00000000000 deg
        # of points         126
        Field maximum        0.99962 V/mm^0
        Maximum z [mm]       0.00000
        Field width [mm]    50.51249

----------------------------------------------------
Particle properties:
Object position zo=        -6.0000000E+01 mm
Energy=                     1.0000000E+04 eV
U=                          1.0000000E+04 eV
Delta Energy=               1.0000000E+00 eV
Aber. for aperture=         5.0000000E-03 rad
Aber. for obj. height=      1.0000000E-03 mm
Deflection X=               1.0000000E+00 mm
           Y=               1.0000000E+00 mm

Image #                           0 (asymptotic), image #  1 not found!
Image position zi=         -6.0000000E+01 mm

Beam rotation=              0.0000000E+00 rad
                            0.0000000E+00 deg
Image magnification=        1.0000000E+00 times

Aberration coefficients related to image

-------------- Main deflection -----------------
Deflection x=               1.6023159E-01 mm
           y=               0.0000000E+00 mm
       total=               1.6023159E-01 mm
Angle=                      0.0000000E+00 rad
Angle=                      0.0000000E+00 deg
Slope x'=                  -2.6705265E-03
      y'=                   0.0000000E+00 mm

Main deflection aberration coefficients
Aberration coefficient                                   | Error in micrometers
---------------------------------------------------------------------------------------
 coma length:             5.0000E-01,  0.0000E+00        |   1.8750E-02,  6.2500E-03 um
 field curvature:         6.4269E-03              1/mm   |   6.4269E-02              um
 astigmatism:             3.8057E-03,  0.0000E+00 1/mm   |   0.0000E+00,  3.8057E-02 um
 distortion:              4.6756E-05,  0.0000E+00 1/mm^2 |   9.3511E-02,  9.3511E-02 um
 chromatic:              -1.0000E+00,  0.0000E+00        |  -1.0000E-01, -1.0000E-01 um
 landing error:          -1.6667E-02,  0.0000E+00 rad/mm |  -9.5493E-01, -9.5493E-01 deg
 ----- Total aberration (geom. and. chrom)                   2.0847E-01 um

Mixed aberration coefficients for finite object
 kappa   F=   0.0000E+00,  0.0000E+00   A=  -8.3333E-03,  0.0000E+00 1/mm
 dist.   D1=  0.0000E+00,  0.0000E+00   D2=  0.0000E+00,  0.0000E+00 1/mm^2
         D3=  3.2531E-04,  0.0000E+00   D4=  1.9190E-04,  0.0000E+00 1/mm^2