ANB
ANalytic Bremstrahlung Calculation

The packages can be taken from this area for free at the sole responsibility of the user.
Please cite this as : F.A. Natter at al., to be published.

Here, you get the code (version 2.0) for the Analytic Bremstrahlungs Calculation

Short description of the package:

• files: the zipped tar file anb.tar.gz contains:

  anb.c	the code for the calculation of the bremsstrahl spectra
  vec.c,h	a module to handle 3 dimensional simple vector operations
  mami220c.in	an example input file for anb
  mami220c.log	the corresponding log file of an anb run
  mami220c.vec	ascii output file of anb

• input file:

  parameter	explanation
  comment	first line is a user comment line to be stored in the log file
  beam energy	mean energy of the incident beam electrons in MeV
  energy spread	width (s) of the beam energy distribution
  crystal orientation	3 crystal angles: (a,q,y) in rad
  beam spot size	horizontal and vertical beam spot size on radiator in [mm]
  beam divergence	horizontal and vertical beam divergence at the radiator in [mrad]
  thickness of radiator	thickness of crystal radiator in [mm]
  geometry of collimator	distance target/collimator in [m], length [m] and radius [mm]
  incoherent type	mode of calculation the incoherent intensity (0:Bethe Heitler, 1:Hubbell xsec)
  number of lattice vectors	number of lattice vectors to be used for the calculation (the less the faster)
  Z of radiators	charge number of crystal and amorphous radiator nuclei

• input file: informs about the process of the calculation and contains various variables calculated along the way, e.g. a list of lattice vectors, etc.

• output file: ascii file with 1000 rows and 7 columns as explained in the following:

  1 st:	photon energy in [MeV]
  2 nd:	total coherent intensity Ic = sperp +spara
  3 rd:	diff coherent Id = sperp -spara
  4 th:	incoherent crystal Ii
  5 th:	incoherent amorphous Ia
  6 th:	electron contrib crystal Ie,i
  7 th:	electron amorphous Ie,a

  This file may be read from various programs like PAW, xmgr, plotdata to produce bremsstrahl spectra,e.g.:
  

  It = Ic + Ii + Ie,i	total experimental crystal intensity
  Ir = Ic / ( Ia + Ie,a )	relative experimental spectra, for example crystal versus amorphous radiator
  Ir = Ic / ( Ii + Ie,i )	relative spectra of the crystal radiator alone
  P = - Id/It	polarisation

• spectra from the example input file:
  (above all total intensities and below relative intensity and polarisation)

  

• compilation: cc anb.c vec.c -g -lm -o anb