def test_linopt_matching(test_ring):
# Define the location of constraint
sf = at.get_refpts(test_ring, 'SF*')[1::2]
center = at.get_refpts(test_ring, 'CellCenter')
# Define the variables
names = ['QF1*', 'QD2*', 'QD3*', 'QF4*', 'QD5*', 'QF6*', 'QF8*']
bounds = [[0, 5], [-5, 0], [-5, 0], [0, 5], [-5, 0], [0, 5], [0, 5]]
variables = [
at.ElementVariable(at.get_refpts(test_ring, nm),
'PolynomB',
index=1,
name=nm) for nm, bnd in zip(names, bounds)
]
# Define an evaluation function for the phase advance (both planes)
# noinspection PyUnusedLocal
def mu_diff(lindata, tune, chrom):
delta_mu = (lindata[1].mu - lindata[0].mu) / (2 * np.pi)
return delta_mu % 1.0
# Define the constraints
cst1 = at.LinoptConstraints(test_ring)
cst1.add('tunes', [0.38, 0.85], name='tunes')
# Start of the ring
cst1.add('alpha', [0.0, 0.0], refpts=0, name='alpha_0')
cst1.add('dispersion', 0.0, refpts=0, index=1, name="eta'_0")
# Center of the cell
cst1.add('beta', 4.69999257, refpts=center, index=1, name='betay_c')
cst1.add('alpha', [0.0, 0.0], refpts=center, name='alpha_c')
cst1.add('dispersion', 0.0, refpts=center, index=1, name="eta'_c")
# Focusing sextupoles
cst1.add('beta', [5.40000677, 5.39998124],
refpts=sf,
index=1,
name='betay_sf')
cst1.add('alpha', [0.68000392, -0.67999686],
refpts=sf,
index=1,
name='alphay_sf')
cst1.add('dispersion', [0.08820002, 0.08819999],
refpts=sf,
index=0,
name="eta_sf")
# Phase advance
cst1.add(mu_diff, [0.49721338, 0.48228011], refpts=sf, name='delta phi')
# Perform the fit
newring = at.match(test_ring, variables, (cst1, ), method='lm', verbose=1)
# check the residuals
assert_close(cst1.evaluate(newring), 0, rtol=0.0, atol=1e-4)
def test_envelope_matching(test_ring):
# Define the variables
names = ['QF1*', 'QD2*']
variables = [at.ElementVariable(at.get_refpts(test_ring, nm), 'PolynomB',
index=1, name=nm) for nm in names]
variables += [at.ElementVariable([0], 'Voltage', name='voltage')]
# [0] instead of 0 because of bug in utils.py
# Define the constraints
lopcst = at.EnvelopeConstraints(test_ring)
lopcst.add('tunes', [0.38, 0.85, 1.1e-4])
# Perform the fit
newring = at.match(test_ring, variables, (lopcst,), verbose=1)
# check the residuals
residual = lopcst.evaluate(newring.radiation_on(copy=True))
assert_close(residual, 0, rtol=0.0, atol=6e-9)
# Define the constraints
lincst = at.LinoptConstraints(test_ring)
lincst.add('tunes', [0.38, 0.85], name='tunes')
lopcst = at.EnvelopeConstraints(test_ring)
lopcst.add('tunes', 1.1e-4, index=2, name='sync. tune')
# Perform the fit
newring = at.match(test_ring, variables, (lincst, lopcst), verbose=1)
# check the residuals
linresidual = lincst.evaluate(newring)
lopresidual = lopcst.evaluate(newring.radiation_on(copy=True))
assert_close(linresidual, 0, rtol=0.0, atol=3e-9)
assert_close(lopresidual, 0, rtol=0.0, atol=3e-8)
def test_ring():
path = os.path.realpath(os.path.join(os.path.dirname(__file__),
'../test_matlab/hmba.mat'))
ring = at.load_mat(path)
sf = at.get_refpts(ring, 'SF*')
sf1 = ring[sf[0]].divide([0.5, 0.5])
sf2 = ring[sf[1]].divide([0.5, 0.5])
ring.pop(sf[1])
ring.insert(sf[1], sf2[1])
ring.insert(sf[1], sf2[0])
ring.pop(sf[0])
ring.insert(sf[0], sf1[1])
ring.insert(sf[0], sf1[0])
return ring