import numpy
from ..lattice import Lattice
# noinspection PyProtectedMember
from ..lattice.elements import Element, Collective, _array
from ..constants import clight, qe
from .wake_object import Wake, WakeComponent
# noinspection PyPep8Naming
[docs]class WakeElement(Collective, Element):
"""Class to generate an AT wake element using the passmethod WakeFieldPass
"""
_BUILD_ATTRIBUTES = Element._BUILD_ATTRIBUTES
default_pass = {False: 'IdentityPass', True: 'WakeFieldPass'}
_conversions = dict(Element._conversions, _nslice=int, _nturns=int,
_nelem=int, _wakeFact=float,
NormFact=lambda v: _array(v, (3,)),
ZCuts=lambda v: _array(v),
_wakeDX=lambda v: _array(v),
_wakeDY=lambda v: _array(v),
_wakeQX=lambda v: _array(v),
_wakeQY=lambda v: _array(v),
_wakeZ=lambda v: _array(v),
_wakeT=lambda v: _array(v))
def __init__(self, family_name: str, ring: Lattice, wake: Wake, **kwargs):
"""
Parameters:
family name: Element name
ring: Lattice in which the element will be inserted
wake: :py:class:`.Wake` object
Keyword Arguments:
Nslice (int): Number of slices per bunch. Default: 101
Nturns (int): Number of turn for the wake field. Default: 1
ZCuts: Limits for fixed slicing, default is adaptive
NormFact (Tuple[float,...]): Normalization for the 3 planes,
to account for beta function at the observation point for
example. Default: (1,1,1)
"""
kwargs.setdefault('PassMethod', self.default_pass[True])
zcuts = kwargs.pop('ZCuts', None)
self._wakefact = - ring.circumference/(clight *
ring.energy*ring.beta**3)
self._nslice = kwargs.pop('Nslice', 101)
self._nturns = kwargs.pop('Nturns', 1)
self._turnhistory = None # Defined here to avoid warning
self.clear_history(ring=ring)
self.NormFact = kwargs.pop('NormFact', numpy.ones(3, order='F'))
self._build(wake)
if zcuts is not None:
self.ZCuts = zcuts
super(WakeElement, self).__init__(family_name, **kwargs)
def _build(self, wake):
self._wakeT = wake.srange
self._nelem = len(self._wakeT)
if wake.Z is not None:
self._wakeZ = wake.Z
if wake.DX is not None:
self._wakeDX = wake.DX
if wake.DY is not None:
self._wakeDY = wake.DY
if wake.QX is not None:
self._wakeQX = wake.QX
if wake.QY is not None:
self._wakeQY = wake.QY
[docs] def rebuild_wake(self, wake):
self._build(wake)
[docs] def clear_history(self, ring=None):
if ring is not None:
self._nbunch = ring.nbunch
tl = self._nturns*self._nslice*self._nbunch
self._turnhistory = numpy.zeros((tl, 4), order='F')
[docs] def set_normfactxy(self, ring):
l0, _, _ = ring.get_optics()
self.NormFact[0] = 1/l0['beta'][0]
self.NormFact[1] = 1/l0['beta'][1]
@property
def WakeT(self):
return self._wakeT
@property
def WakeZ(self):
"""Longitudinal component"""
return getattr(self, '_wakeZ', None)
@property
def WakeDX(self):
"""Dipole X component"""
return getattr(self, '_wakeDX', None)
@property
def WakeDY(self):
"""Dipole Y component"""
return getattr(self, '_wakeDY', None)
@property
def WakeQX(self):
"""Quadrupole X component"""
return getattr(self, '_wakeQX', None)
@property
def WakeQY(self):
"""Quadrupole Y component"""
return getattr(self, '_wakeQY', None)
@property
def Nslice(self):
"""Number of slices per bunch"""
return self._nslice
@Nslice.setter
def Nslice(self, nslice):
self._nslice = nslice
self.clear_history()
@property
def Nturns(self):
"""Number of turn for the wake field"""
return self._nturns
@Nturns.setter
def Nturns(self, nturns):
self._nturns = nturns
self.clear_history()
@property
def TurnHistory(self):
"""Turn histroy of the slices center of mass"""
return self._turnhistory
def __repr__(self):
"""Simplified __repr__ to avoid errors due to arguments
not defined as attributes
"""
attrs = dict((k, v) for (k, v) in self.items()
if not k.startswith('_'))
return '{0}({1})'.format(self.__class__.__name__, attrs)
[docs]class ResonatorElement(WakeElement):
"""Class to generate a resonator, inherits from WakeElement
additonal argument are frequency, qfactor, rshunt
"""
def __init__(self, family_name: str, ring: Lattice, srange,
wakecomp: WakeComponent,
frequency: float, qfactor: float, rshunt: float,
yokoya_factor=1, **kwargs):
r"""
Parameters:
family name: Element name
ring: Lattice in which the element will be inserted
srange: Vector of s position where to sample the wake
wakecomp: Wake component
frequency: Resonator frequency [Hz]
qfactor: Q factor
rshunt: Shunt impedance, [:math:`\Omega`] for longitudinal,
[:math:`\Omega/m`] for transverse
yokoya_factor: Yokoya factor
Keyword Arguments:
Nslice (int): Number of slices per bunch. Default: 101
Nturns (int): Number of turn for the wake field. Default: 1
ZCuts: Limits for fixed slicing, default is adaptive
NormFact (Tuple[float,...]): Normalization for the 3 planes,
to account for beta function at the observation point for
example. Default: (1,1,1)
"""
self._resfrequency = frequency
self._qfactor = qfactor
self._rshunt = rshunt
self._yokoya = yokoya_factor
self._wakecomponent = wakecomp
self._beta = ring.beta
wake = Wake.resonator(srange, wakecomp, frequency, qfactor, rshunt,
ring.beta, yokoya_factor=yokoya_factor)
super(ResonatorElement, self).__init__(family_name, ring, wake,
**kwargs)
[docs] def rebuild_wake(self):
wake = Wake.resonator(self.WakeT, self._wakecomponent,
self._resfrequency, self._qfactor,
self._rshunt, self._beta, self._yokoya)
self._build(wake)
@property
def ResFrequency(self):
"""Resonator frequency [Hz]"""
return self._resfrequency
@ResFrequency.setter
def ResFrequency(self, frequency):
self._resfrequency = frequency
self.rebuild_wake()
@property
def Qfactor(self):
"""Resonator Q factor"""
return self._qfactor
@Qfactor.setter
def Qfactor(self, qfactor):
self._qfactor = qfactor
self.rebuild_wake()
@property
def Rshunt(self):
r"""Resonator shunt impedance, [:math:`\Omega`] for longitudinal,
[:math:`\Omega/m`] for transverse"""
return self._rshunt
@Rshunt.setter
def Rshunt(self, rshunt):
self._rshunt = rshunt
self.rebuild_wake()
@property
def Yokoya(self):
"""Resonator Yokoya factor"""
return self._yokoya
@Yokoya.setter
def Yokoya(self, yokoya):
self._yokoya = yokoya
self.rebuild_wake()
[docs]class LongResonatorElement(ResonatorElement):
"""Class to generate a longitudinal resonator, inherits from WakeElement
additional argument are frequency, qfactor, rshunt
"""
def __init__(self, family_name: str, ring: Lattice, srange,
frequency: float, qfactor: float, rshunt: float,
**kwargs):
r"""
Parameters:
family name: Element name
ring: Lattice in which the element will be inserted
srange: Vector of s position where to sample the wake
frequency: Resonator frequency [Hz]
qfactor: Q factor
rshunt: Shunt impedance, [:math:`\Omega`] for longitudinal,
[:math:`\Omega/m`] for transverse
Keyword Arguments:
yokoya_factor: Yokoya factor
Nslice (int): Number of slices per bunch. Default: 101
Nturns (int): Number of turn for the wake field. Default: 1
ZCuts: Limits for fixed slicing, default is adaptive
NormFact (Tuple[float,...]): Normalization for the 3 planes,
to account for beta function at the observation point for
example. Default: (1,1,1)
"""
super(LongResonatorElement, self).__init__(family_name, ring, srange,
WakeComponent.Z, frequency,
qfactor, rshunt, **kwargs)
[docs]class ResWallElement(WakeElement):
"""Class to generate a resistive wall element, inherits from WakeElement
additional argument are yokoya_factor, length, pipe radius, conductivity
"""
def __init__(self, family_name: str, ring: Lattice, srange,
wakecomp: WakeComponent, rwlength: float,
rvac: float, conduc: float, yokoya_factor=1, **kwargs):
"""
Parameters:
family name: Element name
ring: Lattice in which the element will be inserted
srange: Vector of s position where to sample the wake
wakecomp: Wake component
rwlength:
rvac:
conduc:
yokoya_factor: Yokoya factor
Keyword Arguments:
Nslice (int): Number of slices per bunch. Default: 101
Nturns (int): Number of turn for the wake field. Default: 1
ZCuts: Limits for fixed slicing, default is adaptive
NormFact (Tuple[float,...]): Normalization for the 3 planes,
to account for beta function at the observation point for
example. Default: (1,1,1)
"""
self._wakecomponent = wakecomp
self._rwlength = rwlength
self._rvac = rvac
self._conductivity = conduc
self._yokoya = yokoya_factor
self._beta = ring.beta
wake = Wake.resistive_wall(srange, wakecomp, rwlength, rvac, conduc,
ring.beta, yokoya_factor=yokoya_factor)
super(ResWallElement, self).__init__(family_name, ring, wake, **kwargs)
[docs] def rebuild_wake(self):
wake = Wake.resistive_wall(self.WakeT, self._wakecomponent,
self._rwlength, self._rvac,
self._conductivity, self._beta,
yokoya_factor=self._yokoya)
self._build(wake)
@property
def RWLength(self):
"""Length of the resistive wall"""
return self._rwlength
@RWLength.setter
def RWLength(self, length):
self._rwlength = length
self.rebuild_wake()
@property
def Conductivity(self):
"""Conductivity of the beam pipe [S/m]"""
return self._conductivity
@Conductivity.setter
def Conductivity(self, conduct):
self._conductivity = conduct
self.rebuild_wake()
@property
def Rvac(self):
"""Radius of the beam pipe [m]"""
return self._rvac
@Rvac.setter
def Rvac(self, rvac):
self._rvac = rvac
self.rebuild_wake()
@property
def Yokoya(self):
"""Yokoya factor for the reistive wall"""
return self._yokoya
@Yokoya.setter
def Yokoya(self, yokoya):
self._yokoya = yokoya
self.rebuild_wake()