Release note version 1.0.0
Bargmann-Michel-Telegi equation for the spin precession
equations
The treatment of the BMT equation for spin precession has been programmed. Let be the polarization defined by a normed vector with 3 components P (each component taking a value between -1 and +1) The BMT precession equation is the following :
The gyromagnetic anomaly a is normally equal to α/2π +O(α2), α being the fine structure constant. With a strong field a is a function of the field strenght, through the parameter :
This interpolation for the gyromagnetic anomaly has been programmed with the aid of polynomial approximations.
keywords
The BMT precessionis switched on by the keyword bmt_precession=1 in the $PARAMETERS:: field.
modification of the file formats
To each particle has been associated the normalized polarization 3-vector. This polarization is added to the file beam1(2).dat.
In addition the order in the sequence of the particles have been randomized before output.
Attachments (2)
- bmt.png (43.2 KB) - added by 16 years ago.
- upsilon.png (20.0 KB) - added by 16 years ago.
Download all attachments as: .zip