Merge branch...

Merge branch '90-documentation-of-ringdefinition-beam_thetainit-and-beam-momentum_tolerance' into 'master'

Resolve "Documentation of RingDefinition beam_thetainit and  Beam momentum_tolerance"

Closes #90

See merge request OPAL/documentation/manual!189

beam-command.asciidoc

@@ -110,7 +110,8 @@ NPART::
   The number of macro particles for the simulations
 NSLICE::
   The number of slices per bunch
-
+MOMENTUM_TOLERANCE::
+  Fractional tolerance to deviations in the distribution compared to the reference momentum at initialisation. If <= 0, no tolerance checking is done (default=1e-2).
 
 [[sec.beam.bibliography]]
 === References

elements.asciidoc

@@ -1749,7 +1749,7 @@ This is a restricted feature: _OPAL-cycl_.
 label: RINGDEFINITION,
        RFFREQ=real, HARMONIC_NUMBER=real, IS_CLOSED=string, SYMMETRY=int,
        LAT_RINIT=real, LAT_PHIINIT=real, LAT_THETAINIT=real,
-       BEAM_PHIINIT=real, BEAM_PRINIT=real, BEAM_RINIT=real;
+       BEAM_PHIINIT=real, BEAM_THETAINIT=real, BEAM_PRINIT=real, BEAM_RINIT=real;
 ----
 
 A `RingDefinition` object contains the main characteristics of a
@@ -1781,6 +1781,8 @@ BEAM_RINIT::
   Initial radius of the reference trajectory [m].
 BEAM_PHIINIT::
   Initial azimuthal angle of the reference trajectory [degree].
+BEAM_THETAINIT::
+  Additional rotation of the beam direction relative to the ring tangent [degree].
 BEAM_PRINIT::
   Transverse momentum latexmath:[\beta \gamma] for the reference
   trajectory.