def loadLatticeFormat_dat(filename, lattice):
try:
f = open(filename, 'r')
latticeString = f.read()
except:
print 'Bad datafile! From loadLatticeFormat_dat...'
return 0
# Useful parameters from lattice
beamdata = lattice.getBeamdata()
m_0 = beamdata[2]
beta = beamdata[0]
gamma = gammaFromBeta(beta)
q = beamdata[3]
newLattice = Lattice("Loaded Lattice", beamdata, lattice.getTwiss(), lattice.getMultipart())
try:
# Parsing
for line in iter(latticeString.splitlines()):
words = line.split()
typeOfElem = words[0]
if typeOfElem == "DRIFT":
# Useful params
L = float(words[1])/1000 # /1000 is for converting mm to m
# Useless params
R = float(words[2])
Ry = float(words[3])
# Params not stated that I need to construct the element
name = "d"
# Create the element
newLattice.createDrift(name, L)
elif typeOfElem == "QUAD":
# Useful params
L = float(words[1])/1000
G = float(words[2]) # They say G I say K, what is the difference? Ans: See TraceWin documentation page 102 my K is their -k
# Indirect params
Brho = m_0*constants.c*beta*gamma/q
k = np.sqrt(float(abs(G/Brho))) # For some reason abs(...) is a sympy float and np.sqrt just can't handle that
if q*G > 0:
K = -k # focus in horiz (x)
else:
K = k # defocus in horiz (x)
# Useless params
R = float(words[2])
# Params not stated that I need construct the element
name = "q"
# Create the element
newLattice.createQuadrupole(name, K, L)
elif typeOfElem == "MULTIPOLE":
if int(words[1]) == 3: # sextupole
L = float(words[2])/1000
k = float(words[4])
order = 2 # for the lie transform
name = "s"
newLattice.createSextupolerel(name, k, L, order)
elif typeOfElem == "ROTATION":
nu_x = float(words[1])
nu_y = float(words[2])
name = "r"
newLattice.createRotation(name, nu_x, nu_y)
elif typeOfElem == "END":
continue
#if typeOfElem == "":
# Useful params
# Useless params
# Params not stated that I need construct the element
# Create the element
return newLattice
except:
print "Parsing failed" + str(sys.exc_info()[-1].tb_lineno)
return 0
