VITESS 2.9  Release Note
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New modules:
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collimator_radial:
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This modules is meant to simulate radial collimators into a certain theta range of distinct length, 
distance from center, entrance and exit height. Number of channels and blade width are further input 
parameters. The oscillation width is considered, but the blade position is defined by a random
number, not by the actual time of flight.

collimator:
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This module can be used to simulate straight, converging or diverging soller collimators with 
perfectly absorbing walls that may be divided into vertical channels. (Blade width can be given.)
In contrast to 'collimator_soller', the trajectories through the collimator are calculated.

sample_environment:
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Bragg scattering from material surrounding the sample can now be treated. Position, dimensions, 
cross-section and the structure factor have to be given. Usually 2 modules are necessary to treat
neutron entering (option 'in') and leaving ('out') the sample environment with the sample (and
maybe another sample environment) in between.

eval_elast2:
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As the 2-dimensional monitors, this module shows the intensity as a function of 2 parameters, 
i.e. I(theta, wavelength) or I(theta, TOF).

sesans_field:
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Triangular shaped magnetic fields as used for SESANS instruments can be simulated using the new
module 'sesans_field'.




New features in existing modules:
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Guide:
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- the trajectories of the neutrons inside the guide can be followed now
 (the properties of the neutron at each reflection are written into a file)
- any symmetric guide shape consisting of several pieces can now be treated using a shape definition file
- calculation of the guide surface area

Monochromator:
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- Gaps between elements and deviations from ideal orientation can be simulated