A. Freise 22.07.2006

FINESSE +FINESSE +

future plans and work in progress

Andreas Freise 22nd July 2006

A. Freise 22.07.2006

FINESSEFINESSE

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

Nightly run of the latest version

against several hundret example

files.

What is missing, is a set of files

which have been checked by an

independent user against calculation

and/or experimental data

Testing: -------- Thu Jul 20 10:46:08 BST 2006Entering physics ... OK: darkf-comp.kat OK: grating1.katEntering random ... OK: 00all_gouy.kat OK: 00first.kat OK: 01cavity-mode.kat OK: 01resoances.kat OK: 01tilt.kat OK: 02fringes-pm.kat OK: 02fringes-untuned.kat 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:

Threaded server‘katd’

Client3

Client2

Client1

Server ‘katd’ started with input file, without ‘xaxis’Clients send commands like: component parameter valueand receive one result (data point) per command

TCP/IP

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