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Minutes of the INTAS meeting, Amsterdam, October 28 2000.
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Present: Alfons Hoekstra, Carsten Dominik, Ludmilla Astaviefa,
Nicolai Voshchinikkov, Anri Perelman, Viktor Tiskovets, Thomas
Henning, Hester Volten, Karine Chamaillard, Rens Waters.


Purpose of the meeting was to introduce the members of the INTAS
team and to define some short-term programmes that we can finish
in the first year of the programme. At 10:35 the meeting started
with a welcome from RW, followed by introductions of all
participants. After this, the different groups participating in
the INTAS programme presented their interests and expertise within
the light scattering context. A brief summary of the different
presentations is given below. When names are mentioned, the whole
research group is implied.

Alfons Hoekstra, UvA informatics (not formally taking part in
INTAS): expertise on theory of light scattering and numerical
treatment using the DDA technique. Also working on radiation
forces on small non-spherical particles.

Hester Volten, VU (not formally taking part in INTAS): Expertise
on light scattering experiments in the laboratory using the VU
set-up (lead by Joop Hovenier).

Ludmilla Astavieva (Minsk): matrix calculations for non-spherical
particles, algotithm development and comparison with e.g. T matrix
calculations. Model calculations for the fields inside particles.

Viktor Tiskovets (Kharkov): Expertise in the theory of light
scattering (e.g. applications to Saturn's rings polarisation).
Observations and modeling of comets; fractal particles.

Nicolai Voshchinikkov (St. Petersburg): multilayered particles,
scattering calculations of spheroids with extreme axial ratios,
axisymmetric layered particles, spherical multilayered particles,
effective medium theory and monte carlo simulations, radiative
transfer.

Thomas Henning (Jena): Many activities!! Within the INTAS
programme the following activities are in particular mentioned:
(1) light scattering experiment, (2) electronic database of
optical constants (3) laboratory measurements of optical
constants, (4) radiative transfer of polarized light.

Anri Perelman (St. Petersburg): non-spherical particles where
optical properties depend on distance from the centre only.
Particle systems, and non-spherical particles.

Carsten Dominik (Amsterdam, not formally taking part in INTAS):
Coagulation calculations, collisional debris disk evolution,
physics and chemistry of dust, radiative transfer.

Karine Chamaillard (Paris, not formally taking part in INTAS):
light scattering of rough surface spherical particles, DDA method.

Rens Waters (Amsterdam): Observational studies of circumstellar
matter in young and evolved stars, mineralogy, radiative transfer
(with Alex de Koter).

At 12:55 a simple lunch was served. The meeting continued at 13:45
with a presentation by RW of the financial status of the project.
Euro 60,000 has been put to our disposal, and about Euro 44,000
has been allocated to the NIS partners in the project. The
proposal is to allocate Euro 7200 to Jena and Amsterdam each for
travel and other expenses, leaving about Euro 2000 for emergencies
in the first year. This proposal was agreed upon by all present.

The meeting then proceeded with a discussion on possible projects
to be done within the coming 6 months to 1 year. These projects
can then be reported on in the progress report with has to be
written after the first year of our project. This is important in
order to obtain the second money batch of the project. The
following list was agreed upon:

1. Verify Viktor's code using generalized theory (see e.g. Michel
et al 1995 ApJ).

2. Calculate the effect of grain shape and size of the emission
peaks of olivines and pyroxenes, using rather extreme values of
the shape and size parameters. These calculations should be done
for different Fe/Mg ratios and compared to the observed band
positions. Nicolai's code can be used.

3. Investigate the effect of different crystallographic axes on
overall optical constants of mineral materials and on the emergent
infrared spectrum.

4. Monitor variations in photometry and polarimetry of UX Ori
stars (Crimea observatory).

5. Compare internal field calculations of Ludmilla with those of
Alfons.

6. Continue the building of the web-page with optical constants,
light scattering codes, benchmark results, etc etc which is based
in St. Petersburg (has link to Jena webpage).

7. Make a new webpage for the INTAS project with electronic
version of the papers published so far in the context of INTAS and
links to relevant other pages.

The following action items (AIs) resulted from the meeting:

AI1: project 1: will be taken up by Viktor.

AI2: project 2: will be taken up by Nicolai, Thomas and Rens.

AI3: project 5: will be taken up by Ludmilla, Carsten and Alfons.

AI4: project 6: is being done by Nicolai.

AI5: project 7: will be done by Rens.

(projects 3, 4 need no immediate action.)

AI6: to ALL: send Rens electronic versions of papers published
with INTAS acknowledgements.

AI7: to Rens: find out what INTAS needs in terms of receipts of
purchases done with INTAS money.

AI8: to ALL: inform Rens of presentations done with INTAS
involvement at conferences.

The meeting ends at 16:00 with a discussion of the time and
location of the next meeting. It was agreed that we should meet at
the end of 2001 or spring of 2002, and meeting places suggested
are Jena and St. Petersburg. A final decision will be taken autumn
2001.

Amsterdam, October 30, 2000
Rens Waters