XHEXP1-Floor-Discussion_MLx

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Nov 26, 2013 (3 years and 6 months ago)

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Discussion: Floor Layout of XHEXP1

7. September 2010, 10:00


11:00

Albert
-
Einstein
-
Ring 19, 2.26




Present

Christian Bressler


Tobias Haas

Max Lederer

Anders Madsen

Adrian Mancuso

Michael Meyer

Serguei Molodtsov



T. Haas presents the input information
for this discussion. This is




General layout of experimental hall floor



Spatial requirements for control rooms and rack rooms from Chris
Youngman



Footprint of the SQS instrument from the CDR by M. Meyer



Presentation by M. Lederer on spatial requirements an
d possible
placement options for the laser hutches



Investigation of vibrational properties of laser platform done by a
summer student


He states that it should be the goal of this discussion to converge on one of four
general options for placing the laser
hutches:

1.

Placement on the ground floor of XHQ

a.

Issues: vibrations, long optical path, tight space requirements on
the ground floor of XHQ

2.

Placement inside the experimental areas

a.

Issues: possibly unresolvable conflict with a third beam
line/instrument

3.

Placement between two experimental areas

a.

Issues: escape route would need to contain stairs to get over the
laser hutch

4.

Placement on a platform above the instruments

a.

Issues: vibrations

M. Lederer supplements this information by stating the requirements for
the
laser setup and the basic principles employed to fulfill these:




as muc
h passive stability as possible => l
aser should be as close as
possible to the experimen
t
.



highly vibration
-
stable ground and

close proximity to experiments to
prevent pointing (
fem
to
-
LASIK
-
type installation

desirable, 1m concrete
slab) and timing drift error. E. g., a temperature
differential
swing of 0.1°C
between 2 points on concrete separated by 50m distance corresponds to
a linear expansion of about 50µm or about 10 pulsewidths
of a 15fs
pulse…



A
pply active stabilisatio
n means („Aligna“, XCORR, etc.) last,
where
necessary.



Central
local (sub
-
)hutch for sync
-
distribution

as close to all lasers as
possible

due to jitter and drift minimization with regards to machine
clock.


From t
he discussion there emerges a very strong preference for option 3. T. Haas
states that
the related safety question whether the modified escape route would
be acceptable can only be reliably answered once a schematic floor plan is
available both for the sof
t x
-
ray beam line as well as for at least one hard x
-
ray
beam line.

It is decided that option 3 should be considered the working assumption for the
moment and that floor plans should be drawn up by the instrument scientists
based on the existing informati
on concerning sizes of laser and rack hutches as
well as control rooms. This should be done by



4 November 2011


This gives enough time to take into account the results from the up coming CDR
presentations.




Protocol by T. Haas and M. Lederer