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fix setters of p0c and delta to update _rvv and zeta #57

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fix setters of p0c and delta to update _rvv and zeta #57

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9 changes: 9 additions & 0 deletions pysixtrack/particles.py
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Original file line number Diff line number Diff line change
Expand Up @@ -310,8 +310,14 @@ def delta(self, delta):
self._delta = delta
deltabeta0 = delta * self.beta0
ptaubeta0 = sqrt(deltabeta0 ** 2 + 2 * deltabeta0 * self.beta0 + 1) - 1
if hasattr(self,'_rvv'):
oldrvv = self._rvv
else:
oldrvv = None
self._rvv = (1 + self.delta) / (1 + ptaubeta0)
self._rpp = 1 / (1 + self.delta)
if oldrvv:
self.zeta *= self._rvv / oldrvv

psigma = property(lambda self: self.ptau / self.beta0)

Expand Down Expand Up @@ -424,12 +430,15 @@ def _update_particles_from_absolute(self, Px, Py, pc, energy):
if self._update_coordinates:
mratio = self.mass / self.mass0
norm = mratio * self.p0c
oldrvv = self._rvv
self._mratio = mratio
self._chi = self._qratio / mratio
self._ptau = energy / norm - 1
self._delta = pc / norm - 1
self._rvv = self.beta / self.beta0
self.px = Px / norm
self.py = Py / norm
self.zeta *= self._rvv / oldrvv

def __repr__(self):
out = f"""\
Expand Down