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loki_3m.in
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loki_3m.in
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!-----------------------------------------------------
! Approximate geometry of LoKI guide
!-----------------------------------------------------
!
! cold source
!-----------------------------------------------------
SOURCE RECTANGULAR ! W, H of source, Distance to and W, H of virtual aperture, (halo[*1])
30 200 2000 25 30
!
! Guide 1
!-----------------------------------------------------
GUIDE CURVED MULTIPLE ! Gap, W, H at start, Length, Rc[m] (W, H at end) (sideways: -ve is down, +ve is up)
5 0
2000 5 30 3500 61.25 5 30
FACE 1 ! rhs (seen travelling with the neutron beam) bottom
3
FACE 2 ! lhs top
3
FACE 3 ! bottom lhs
3
FACE 4 ! top rhs
3
!
! Guide 2
!-----------------------------------------------------
GUIDE STRAIGHT ! Gap, W, H at start, Length, (W, H at end)
5 25 30 6000 25 30
FACE 1 ! rhs (seen travelling with the neutron beam) bottom
2
FACE 2 ! lhs top
2
FACE 3 ! bottom lhs
2
FACE 4 ! top rhs
2
!
! Guide 3
!-----------------------------------------------------
GUIDE CURVED MULTIPLE ! Gap, W, H at start, Length, Rc[m] (W, H at end) (sideways: -ve is down, +ve is up)
5 0
5 5 30 3500 -61.25 5 30
FACE 1 ! rhs (seen travelling with the neutron beam) bottom
3
FACE 2 ! lhs top
3
FACE 3 ! bottom lhs
3
FACE 4 ! top rhs
3
!
! Guide 4 - to collimation
!-----------------------------------------------------
GUIDE STRAIGHT ! Gap, W, H at start, Length, (W, H at end)
5 25 30 500 25 30
FACE 1 ! rhs (seen travelling with the neutron beam) bottom
2
FACE 2 ! lhs top
2
FACE 3 ! bottom lhs
2
FACE 4 ! top rhs
2
!
! Guide 5 - first collguide
!-----------------------------------------------------
GUIDE STRAIGHT ! Gap, W, H at start, Length, (W, H at end)
5 25 30 3000 25 30
FACE 1 ! rhs (seen travelling with the neutron beam) bottom
2
FACE 2 ! lhs top
2
FACE 3 ! bottom lhs
2
FACE 4 ! top rhs
2
!
! Guide 6 - second collguide
!-----------------------------------------------------
GUIDE STRAIGHT ! Gap, W, H at start, Length, (W, H at end)
5 25 30 2000 25 30
FACE 1 ! rhs (seen travelling with the neutron beam) bottom
2
FACE 2 ! lhs top
2
FACE 3 ! bottom lhs
2
FACE 4 ! top rhs
2
!
! monitor - at sample pos
!-----------------------------------------------------
END GUIDE ! Distance between end of guide and monitor, monitor width, height, H-shift, V-shift
3000 10 10 0 0
!
!-----------------------------------------------------
WAVELENGTH
6
!
!-----------------------------------------------------
GRAVITY SIDEWAYS
!
!-----------------------------------------------------
NEUTRONS ! Number of neutrons [*3*], seed for random number generator (0 : take a random odd number)
1000000 287349743
!
!-----------------------------------------------------
OUTPUT ! iresults and idebug
0 0
!
!-----------------------------------------------------
END INPUT
Syntax:
---------
! is the comment character: lines starting with ! are ignored
SOURCE RECTANGULAR ! W, H of source, Distance to and W, H of virtual aperture, (halo[*1])
SOURCE CIRCULAR ! W of source, Distance to and W, H of virtual aperture, (halo[*1])
SOURCE CYLINDRICAL ! W, H of source[*2*], Distance to and W, H of virtual aperture, (halo[*1])
SOURCE RECTANGULAR_COLLIMATED ! W, H of source, Hor and Ver m-number of divergence, (halo[*1])
SOURCE CIRCULAR_COLLIMATED ! W of source, Hor and Ver m-number of divergence, (halo[*1])
SOURCE CYLINDRICAL_COLLIMATED ! W, H of source[*2*], Hor and Ver m-number of divergence, (halo[*1])
SOURCE FILE ! name of input file. If you want to loop through wavelength,
you need to give the file name without the e.g. '_00500' bit, i.e. if the files are called
thingy_00100.dat, thingy_00200.dat, etc, you need to give thingy.dat as the file name here
GUIDE STRAIGHT ! Gap, W, H at start, Length, (W, H at end)
GUIDE CURVED ! Gap, W, H at start, Length, Rc[m] (W, H at end) (sideways: -ve is down, +ve is up)
GUIDE CYLINDRICAL ! Gap, W, Length
GUIDE PARABOLIC ! Gap, W, H at start, Length, (W, H at end) - hor focus is parabolic, ver focus is linear
GUIDE HORIZONTALLY_PARABOLIC ! same as above
GUIDE VERTICALLY_PARABOLIC ! same as above, but the other way, obviously!
GUIDE TRANSMISSION_MIRROR ! a Si-substrate mirror placed at an angle inside a guide section
! Gap, W, H at start, Length, thickness (W, H at end)
The surface properties must be described either for all faces, or each face individually:
ALL FACES ! following line contains
or ! m-number[*3*], (refl up to m=1 and at edge, waviness[deg], tilt[deg], shift[mm], chamfer[mm])
ALL FACES FILE ! following line contains name of reflectivity file
or
FACE 1 ! rhs (seen travelling with the neutron beam) bottom
- line with numbers (same syntax as for ALL FACES) -
FACE 2 ! lhs top
- line with numbers -
FACE 3 ! bottom lhs
- line with numbers -
FACE 4 ! top rhs
- line with numbers -
Alternatively, the following syntax can be used
FACE 1 FILE ! following line contains name of reflectivity file which can optionally
! be followed by waviness[deg], tilt[deg], shift[mm], chamfer[mm]
etc.
For a transmission mirror, a fifth face is used which can have the following syntax
FACE 5 <keyword1> <keyword2> ! keyword1 can be SINGLE_SIDED or DOUBLE_SIDED referring to the supermirr coating
! keyword2 can be LEFT or RIGHT for a single blade, referring to
! which side the blade starts at, or for a V-shaped device:
! V+ for the apex at the start or V- for the apex at the end
! the following line contains the usual numbers. Alternatively:
FACE 5 <keyword1> <keyword2> FILE ! the following line contains name of reflectivity file
GUIDE STRAIGHT MULTIPLE ! number of guides, hor gap between guides. Next line usual syntax
GUIDE CURVED MULTIPLE ! number of guides, hor gap between guides. Next line usual syntax
END GUIDE ! Distance between end of guide and monitor, monitor width, height, H-shift, V-shift
WAVELENGTH ! wavelength [A]
WAVELENGTH SCAN ! first wavelength, step, last wavelength [A]
WAVELENGTH FILE ! name of input file containing wavelengths [A] (one per line in the input file)
WAVELENGTH RANGE ! continuous range of wavelengths. Give min and max wavelengths [A]
SCAN OFF ! default
SCAN ON ! turns on scanning. The variable which has been given the value -999 is scanned
! following line contains first value, step and last value
SCAN FILE ! turns on scanning. The variable which has been given the value -999 is scanned
! following line contains name of input file containing values of scan variable
! - one per line in the input file
GRAVITY ON ! turns gravity on
GRAVITY OFF ! and off - or turns it
GRAVITY SIDEWAYS ! sideways if so desired
NEUTRONS ! Number of neutrons, seed for random number generator (0: take a random odd number)
! If the number of neutrons is negative, the loop keeps going until the full number of
! neutrons has been transmitted.
OUTPUT ! iresults, idebug:
iresults:
-1 : save each transmitted neutron in huge .dat file
0 : save nothing
1 : append transmission numbers to .out file
2 : append transmission numbers to .out file and save all binned data
idebug:
-2 : No output at all, except total number of neutrons (set screeninput to .FALSE. in main program
and recompile to take all input from screen and avoid prompting for input file)
-1 : Batchjob - no graphics, no prompting
0 : Normal interactive calculation, with prompts for output
1 : Plot trajectories to screen
2 : Print trajectories to PS file
END INPUT ! ignore everything after this
Notes:
[*1*] The source brightness is uniform over the area given by the width (and height). The halo
width describes a linear drop of brightness to zero outside the source area
[*2*] For a cylindrical source, the source brightness over the width varies as sqrt((w/2)^2-r^2).
In this case, the halo is only applied in the vertical direction.
[*3*] Set the m-number to a negative value to denote polarising supermirror
All dimensions are in mm, except the guide radius of curvature, which is in metres.
By default, the reflectivity is 1 up to m=1, decreasing linearly down to 0.9 at m=2.
The exception is for m=1.2, which corresponds to Ni-58, where the reflectivity is 1
right up to the edge.
To avoid direct line-of-sight in a curved guide, Lguide > SQRT(8*width*Rcurv)
The characteristic wavelength is the wavelength at which the curved guide is filled
to 2/3 and is given by lambda(star)=SQRT(2*width/Rcurv)*575/m