adding example for parallel work

examples/parallel/parallel_test.py

+from __future__ import absolute_import
+from __future__ import division
+from __future__ import print_function
+from __future__ import unicode_literals
+from pykat import finesse
+from pykat.detectors import *
+from pykat.components import *
+from pykat.commands import *
+from pykat.structs import *
+import pylab as pl
+import numpy as np
+from pykat.parallel import parakat
+
+# file uses parakat, start cluster with
+# ipcluster-3.4 start -n=4
+# or similar
+
+# xbeta or ybeta
+dof = "ybeta"
+
+# switch between mirror and beamsplitter cavity
+use_bs = True
+
+ybeta = np.logspace(-8,-5, 100)
+
+kat = finesse.kat()
+kat.verbose = False
+kat.maxtem = 4
+kat.noxaxis = True
+
+code_m = """
+const fm 9M
+l psl 1.0 0 npsl 
+mod EOM $fm 0.001 1 pm 0 npsl nEOM1
+s s1 0 nEOM1 nITM1
+
+m1 ITM 0.02 0 0 nITM1 nITM2	 
+attr ITM Rc -2500 
+s s_cav 5000 nITM2 nETM1	
+m1 ETM 0 0 0 nETM1 dump
+attr ETM Rc 2700
+cav c1 ITM nITM2 ETM nETM1
+
+pd1 pdh1 $fm 0 nITM1
+pd2 tf1 $fm 0 $fs nITM1
+deriv_h 1e-13
+"""
+
+code_bs = """
+const fm 9M
+l psl 1.0 0 npsl 
+mod EOM $fm 0.001 1 pm 0 npsl nEOM1
+s s1 0 nEOM1 nITM1
+
+# Cavity
+# -------
+bs1 ITM 0.02 0 0 0 nITM1 nITM1r nITM2 nITM2b  
+attr ITM Rc -2500
+s s_cav_a 5000 nITM2 nETM1
+s s_cav_b 5000 nITM2b nETM1b	
+bs1 ETM 0 0 0 10 nETM1 nETM1b dump dump
+attr ETM Rc 2700 
+cav c1 ITM nITM2 ITM nITM2b
+
+# Output
+# --------
+pd1 pdh1 $fm 0 nITM1r
+pd2 tf1 $fm 0 $fs nITM1r
+deriv_h 1e-13
+"""
+
+if use_bs:
+	kat.parseCommands(code_bs)
+else:
+	kat.parseCommands(code_m)
+
+	
+tf = np.zeros(len(ybeta))
+pdh = np.zeros(len(ybeta))
+
+pk = parakat()
+
+for k, beta in enumerate(ybeta):
+	setattr(kat.ETM, dof, beta)
+	
+	k1 = kat.deepcopy()
+	k1.parseCommands('diff ETM %s' % dof)
+	pk.run(k1, cmd_args=["-cr=on"])
+	
+	k2 = kat.deepcopy()
+	k2.parseCommands('fsig sig1 ETM %s 1e-3 0 1' % dof)
+	pk.run(k2, cmd_args=["-cr=on"])
+	
+outs = pk.getResults()
+pk.close()
+
+for k, beta in enumerate(ybeta):
+	out1, out2 = outs[2*k:(2*k+2)]
+	tf[k] = out2['tf1']
+	pdh[k] = out1['pdh1']
+	
+# Plotting
+# --------------------------------------------------
+
+fig = pl.figure()
+
+pl.loglog(ybeta, np.abs(pdh), label='Slope')
+pl.loglog(ybeta, np.abs(tf),  label='TF(DC)')
+
+pl.xlabel('Misalignment offset [rad] (divergence ~20urad)')
+pl.ylabel('Error signal slope [W/rad]')
+pl.legend(loc=0)
+
+pl.title("%s - %s: signal frequency = %g Hz, maxtem = %i" % (("Beamsplitter" if use_bs else "Mirror"), dof, k2.signals.f.value, kat.maxtem))
+pl.tight_layout()
+pl.grid()
+pl.show()