FINESSE +
future plans and work in progress
Andreas Freise 22nd July 2006
A. Freise 22.07.2006
FINESSE
http://www.rzg.mpg.de/~adf/
A. Freise 22.07.2006
Which Version to Use?
0.99.3 -> current (22.07.2006)
fixed bugs:
o several memory/pointer errors but none showed any difference
when running test examples
A. Freise 22.07.2006
Which Version to Use?
0.99.2 -> 0.99.3 (25.02.2006)
fixed bugs:
o 'cav' tracing did not find its way through a BS when approaching
it from node 4.
A. Freise 22.07.2006
Which Version to Use?
0.99.1 -> 0.99.2 (26.10.2005)
fixed bugs:
o a 'retrace' on an unstable cavity or 'retrace' with no 'cav'
nor 'gauss' command caused a "bug found" message.
o the 'func' command could not parse function strings with
multiple occurences of the same variable name.
o the phase delay on propagation through a 'space' component
had the wrong sign. This basically flipped the frequency
dependence, e.g. upper sidebands were behaving like
lower sidebands and vice-versa. This must have been
wrong since the beginning of Finesse. Should affect
almost all results but mostly by only switching frequency signs.
A. Freise 22.07.2006
Which Version to Use?
0.99 -> 0.99.1 (26.08.2005)
fixed bugs:
o inconsistency in definition of demodulation phase
o a pointer error in the function call for the evaluation
of 'func' commands caused some arbitrary results when
more than one argument was used
o a memory allocation error occurred when 'bp' detectors were used
together with other detector types
o demodulating at a signal frequency introduced a factor of 0.5
for all demodulations except for the standard transfer function
with a pd2.
A. Freise 22.07.2006
Ways to Improve FINESSE
collect simualtion examples for validation/verification
develop and collect tools for automation and data
post-processing
improve performance, flexibility of the FINESSE binary
add new components, mainly for non-classic interferometry
gratings
quantum noise
polarisation
A. Freise 22.07.2006
The FINESSE Test Suite
Testing:
--------
Nightly run of the latest version
against several hundret example Thu Jul 20 10:46:08 BST 2006
Entering physics ...
files. OK: darkf-comp.kat
OK: grating1.kat
Entering random ...
What is missing, is a set of files OK: 00all_gouy.kat
OK: 00first.kat
which have been checked by an OK: 01cavity-mode.kat
independent user against OK: 01resoances.kat
OK: 01tilt.kat
calculation OK: 02fringes-pm.kat
OK: 02fringes-untuned.kat
and/or experimental data OK: 02fringes.kat
OK: 03mode-separation.kat
OK: 04modulation-b.kat
OK: 04modulation-c.kat
OK: 04modulation.kat
OK: 05IB.kat
OK: 06matching.kat
OK: 07CCD.kat
OK: 08telescope.kat
….
A. Freise 22.07.2006
Data Post-Processing
Automate certain simulation tasks
Perform data mining, data preparation
Example 1: complex control matrices
Example 2: „tolerancing“
A. Freise 22.07.2006
Getting More out of FINESSE
Change FINESSE input/output so that the binary can be called
as a function from other programs, e.g. Matlab/Octave
started by Martin Hewitson, copying the idea of his
data server:
TCP/IP
Client1
Threaded server
‘katd’
Client2
Client3
Server ‘katd’ started with input file, without ‘xaxis’
Clients send commands like: component parameter value
and receive one result (data point) per command
A. Freise 22.07.2006
Going Parallel
Beowulf Cluster:
Python script reads input file, „understand“ the dimension
of the parameter space (I.e. xaxis, x2axis) and creates
N new input files, submits them via Condor to the cluster
and then merges the N output files
(student project, first examples work!)
MPI Cluster (true parallel computing)
FINESSE spends 90% of its time in the Sparse routines
„solving“ the set of linear equations. This package can be
replaced by a modern one which can be optimised for
MPI compilers. Then each data point is computed on
aparallel computer.
(another student project?)
A. Freise 22.07.2006
Quantum Noise in FINESSE
Quantum noise can be computed after the standard
calculation has been completed.
An almost identical procedure is used for building the
the quantum noise matrix
A. Freise 22.07.2006
Quantum Noise in FINESSE
Quantum noise can be computed after the standard
calculation has been completed.
An almost identical procedure is used for building the
the quantum noise matrix
A. Freise 22.07.2006
Quantum Noise in FINESSE
Prepared a second interferometer matrix to compute
quantum noise couplings
use field amplitudes and mirror masses as input
parameters
treat every port as a potential input of vacuum
vacuum can be squeezed
Missing:
coupling equations (exist)
some understanding of how to work with multiple fields
testing!
A. Freise 22.07.2006
Conclusion
FINESSE is alive and changing
A communty effort would make it better (especially
with respect to add-on tools)
Simulation work for commissioning might be the
best way to document and preserve knowledge.
Don‘t build an interferometer that way next time!
A. Freise 22.07.2006
End
A. Freise 22.07.2006