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dynamics_Boris_f2py.py
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dynamics_Boris_f2py.py
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#----------------------------------------------------------------------
#
# CERN
#
# European Organization for Nuclear Research
#
#
# This file is part of the code:
#
# PyECLOUD Version 5.0.2
#
#
# Author and contact: Giovanni IADAROLA
# BE-ABP Group
# CERN
# CH-1211 GENEVA 23
# SWITZERLAND
# giovanni.iadarola@cern.ch
#
# contact: Giovanni RUMOLO
# BE-ABP Group
# CERN
# CH-1211 GENEVA 23
# SWITZERLAND
# giovanni.rumolo@cern.ch
#
#
#
# Copyright CERN, Geneva 2011 - Copyright and any other
# appropriate legal protection of this computer program and
# associated documentation reserved in all countries of the
# world.
#
# Organizations collaborating with CERN may receive this program
# and documentation freely and without charge.
#
# CERN undertakes no obligation for the maintenance of this
# program, nor responsibility for its correctness, and accepts
# no liability whatsoever resulting from its use.
#
# Program and documentation are provided solely for the use of
# the organization to which they are distributed.
#
# This program may not be copied or otherwise distributed
# without permission. This message must be retained on this and
# any other authorized copies.
#
# The material cannot be sold. CERN should be given credit in
# all references.
#----------------------------------------------------------------------
from numpy import array, cross, sum, squeeze
import scipy.io as sio
import int_field_for as iff
from boris_step import boris_step
def crprod(bx, by, bz, cx,cy,cz):
ax = by*cz-bz*cy
ay = bz*cx-bx*cz
az = bx*cy-by*cx
return ax, ay, az
class B_none():
def __init__(self, B0x, B0y, B0z):
self.B0x=B0x
self.B0y=B0y
self.B0z=B0z
def get_B(self, xn,yn):
Bx_n = 0*xn + self.B0x
By_n = 0*xn+ self.B0y
Bz_n = 0*xn + self.B0z
return Bx_n, By_n, Bz_n
class B_quad():
def __init__(self, B0x, B0y, B0z, fact_Bmap):
self.B0x=B0x
self.B0y=B0y
self.B0z=B0z
self.fact_Bmap = fact_Bmap
def get_B(self,xn,yn):
Bx_n = self.fact_Bmap*yn.copy()
By_n = self.fact_Bmap*xn.copy()
Bx_n = Bx_n + self.B0x
By_n = By_n + self.B0y
Bz_n = 0*xn + self.B0z
return Bx_n, By_n, Bz_n
class B_file():
def __init__(self, B0x, B0y, B0z, fact_Bmap, B_map_file):
print 'Loading B map'
dict_Bmap=sio.loadmat(B_map_file)
self.Bmap_x = fact_Bmap*squeeze(dict_Bmap['Bx'].real)
self.Bmap_y = fact_Bmap*squeeze(dict_Bmap['By'].real)
self.xx=squeeze(dict_Bmap['xx'].T)
self.yy=squeeze(dict_Bmap['yy'].T)
self.B0x=B0x
self.B0y=B0y
self.B0z=B0z
self.xmin=min(self.xx);
self.ymin=min(self.yy);
self.dx=self.xx[1]-self.xx[0];
self.dy=self.yy[1]-self.yy[0];
def get_B(self, xn,yn):
Bx_n,By_n = iff.int_field(xn,yn,self.xmin,self.ymin,\
self.dx,self.dy,self.Bmap_x,self.Bmap_y)
# the rescaling factor has already been applied to the map
Bx_n = Bx_n + self.B0x
By_n = By_n + self.B0y
Bz_n = 0*xn + self.B0z
return Bx_n, By_n, Bz_n
class pusher_Boris():
def __init__(self, Dt, B0x, B0y, B0z, \
B_map_file, fact_Bmap, Bz_map_file, N_sub_steps=1):
print "Tracker: Boris"
self.N_sub_steps = N_sub_steps
self.Dtt = Dt / float(N_sub_steps)
self.B0x = B0x
self.B0y = B0y
self.B0z = B0z
self.fact_Bmap = fact_Bmap
if B_map_file is None:
self.B_ob = B_none(B0x, B0y, B0z)
elif B_map_file is 'analytic_qaudrupole_unit_grad':
print "B map analytic quadrupole"
self.B_ob = B_quad(B0x, B0y, B0z, fact_Bmap)
else:
self.B_ob = B_file(B0x, B0y, B0z, fact_Bmap, B_map_file)
print "N_subst_init=%d"% self.N_sub_steps
#@profile
def step(self, MP_e, Ex_n,Ey_n, Ez_n=0.):
if MP_e.N_mp>0:
xn1 = MP_e.x_mp[0:MP_e.N_mp]
yn1 = MP_e.y_mp[0:MP_e.N_mp]
zn1 = MP_e.z_mp[0:MP_e.N_mp]
vxn1 = MP_e.vx_mp[0:MP_e.N_mp]
vyn1 = MP_e.vy_mp[0:MP_e.N_mp]
vzn1 = MP_e.vz_mp[0:MP_e.N_mp]
if Ez_n==0.:
Ez_n = 0.*xn1
for ii in range(self.N_sub_steps):
Bx_n, By_n, Bz_n = self.B_ob.get_B(xn1,yn1)
boris_step(self.Dtt,xn1,yn1,zn1,vxn1,vyn1,vzn1,
Ex_n,Ey_n,Ez_n,Bx_n,By_n,Bz_n)
MP_e.x_mp[0:MP_e.N_mp] = xn1
MP_e.y_mp[0:MP_e.N_mp] = yn1
MP_e.z_mp[0:MP_e.N_mp] = zn1
MP_e.vx_mp[0:MP_e.N_mp] = vxn1
MP_e.vy_mp[0:MP_e.N_mp] = vyn1
MP_e.vz_mp[0:MP_e.N_mp] = vzn1
return MP_e
def stepcustomDt(self, MP_e, Ex_n,Ey_n, Ez_n=0., Dt_substep=None, N_sub_steps=None):
if MP_e.N_mp>0:
xn1 = MP_e.x_mp[0:MP_e.N_mp]
yn1 = MP_e.y_mp[0:MP_e.N_mp]
zn1 = MP_e.z_mp[0:MP_e.N_mp]
vxn1 = MP_e.vx_mp[0:MP_e.N_mp]
vyn1 = MP_e.vy_mp[0:MP_e.N_mp]
vzn1 = MP_e.vz_mp[0:MP_e.N_mp]
if Ez_n==0.:
Ez_n = 0.*xn1
for ii in range(N_sub_steps):
Bx_n, By_n, Bz_n = self.B_ob.get_B(xn1,yn1)
boris_step(Dt_substep,xn1,yn1,zn1,vxn1,vyn1,vzn1,
Ex_n,Ey_n,Ez_n,Bx_n,By_n,Bz_n)
MP_e.x_mp[0:MP_e.N_mp] = xn1
MP_e.y_mp[0:MP_e.N_mp] = yn1
MP_e.z_mp[0:MP_e.N_mp] = zn1
MP_e.vx_mp[0:MP_e.N_mp] = vxn1
MP_e.vy_mp[0:MP_e.N_mp] = vyn1
MP_e.vz_mp[0:MP_e.N_mp] = vzn1
return MP_e