Get documents about "Monolithic suspensions
Shared by: dffhrtcv3
-
Stats
- views:
- 2
- posted:
- 10/7/2012
- language:
- Latin
- pages:
- 24
Document Sample
Monolithic
suspensions in Virgo
Helios Vocca
Dipartimento di Fisica & INFN di Perugia
LIGO-G070347-00-Z
Status
• Two fibre pulling machines available (in Perugia and
Cascina);
• One laser CO2 machine available in Cascina (developed
by the Glasgow group);
• A validation procedure for fibre production has been
defined;
• Good results and reproducibility of the silicate bonding
technique;
• The project of the present structure of the dummy
suspension has been defined (mirror, inserts, ears,
clamps, marionetta… in collaboration with the Rome and
Florence groups);
• … few tests have been made;
Fiber production machines
1600
1400
1200
1000
diameter [um]
800
600
400
200
0
0 50 100 150
distance along the fibre [mm]
Fiber production procedure
Main steps:
Fused silica RODs: supply and storage.
Fiber pulling
Fiber validation
Handling and Storage
Validation procedure
We improved our control on the
80 mm fiber
fiber surface quality using a
portable very thin flame welding
machine. It is possible to check
and repair the fiber surface and
increase the validated fiber
It is possible to: quality.
• rearrange the surface defects and cracks;
• weld fibers in the low diameter part accurately;
We are evaluating the optimum diameter for the
welding to minimize the losses induced.
Validation procedure (2)
A 3D Laser Caliper is used
to measure the diameter
and shape of the fiber
produced.
It is possible to verify the
circularity of the fiber
section and to measure the
diameter with a precision
up to 0.1 microns.
Potassium silicate bonding
Silicate bonding procedure has been validated and tested on different
substrates.
Breaking strength versus time of samples with different flatness quality has
been investigated (l/4, l/7 and l/10).
- Tests have been made in a class 10000 clean room, under a class 100 laminar
flux.
Other tests are ongoing for the bonding of Si-Si,
Al2O3-Al2O3 and Si-Al2O3 samples of different
crystal orientations with better results respect
to FS.
Structure of the trial suspension
In October 2006 a trial suspension has
been made using an aluminum mirror
with two FS inserts with a l/10 surface
on which two ears have been bonded.
The upper part of the wire is
welded to a FS clamp fixed to the
dummy marionetta.
Dummy Marionetta
Slit to position the silica
clamps above the mirror
Silica Fiber Clamps
Dummy Mirror
Procedure
Upper clamps
fiber
clamping
fibers system
Procedure
Procedure
Procedure
Procedure
Procedure
Procedure
Procedure
Et voilà…
Thanking the important EGO support and the very hard
work made by the Perugia and Roma technicians:
Antonfranco Piluso, Lucio Farnesini and Maurizio
Perciballi…
We Suspended!!!
Next evolution:
• New upper clamp geometry has been
tested;
• The lower ears has been changed to
better control the positioning of the
bending points;
Stress comparison
Ears geometry:
The lateral flats on the mirrors are centred and have a vertical dimension
of 4 cm.
The bending point has to be fixed on the barycentric plane of the mirror:
we have 2 cm below that point to be used for the bonding and the welding…
For this aim we tested a “lateral” welding on the fiber instead of the “tip-to-tip”
one
Stress on the bonding surface:
2007 2008
05 06 07 08 09 10 11 12 01 02 03 04 05 06 07 08 09 10 11 12
REALIZATION OF A STATIC SUSPENSION
Fibre production
HO2 line
2
CO line
2
Young's modulus test machine develop.
P
Fibres without neck reduction
Selection and production of right profile
Storage box development
Bending point machine
Violin and longitudinal modes test machine 2007 2008
implementation 07
Upper clamp design and 05 06 08 09 10 11 12 01 02 03 04 05 06 07 08 09 10 11 12
l
REALIZATION OF A STATIC SUSPENSION Welding procedure with flame
Welding procedure with CO2 laser
Fibre production
Lower clamping system design and implementation
HO2 line
2 Welding procedure with flame
CO line
2 Welding procedure with CO2 laser
Bending point machine T silica flats
a
Ears realization
Upper clamp design and implementation
Stregth test design
Lower clamping system design and implementation and implementation of a dummy marionette
Development
Development and implementation of a dummy marionette and design
Upper clamp development
Suspension of a dummy mirror M achining
Suspension of a dummy mirror
Definition of the reference solutions and procedures
n
Definition of the reference solutions and procedures
Development and design of a steel marionette
Development and design of a steel marionette
Development of a dielectric reaction massDevelopment of a dielectric reaction mass
MECHANICHAL REALIZATION, RESPONSE CHARACTERIZATION AND CONTROL TEST Design
Purchaising
Realization of a steel marionette
M achining
Realization of a dielectric reaction mass Test and integration
n Assembly of a payload with a dummy mirror glass test (backup solution)
MECHANICHAL
Water
Transportation test REALIZATION, RESPONSE CHARACTERIZATION AND CONTROL TEST
Payload suspension
Local control facility implementation
Realization of a steel marionette
Realization of a dielectric reaction mass
Assembly of a payload with a dummy mirror
Payload control and robustness test
i
Transportation test
READY FOR A DECISION Payload suspension
Local control facility implementation
DEFINITION AND TEST OF THE M OUNTING PROCEDURES
Position sensing marker designing
M irror preparation procedures Position sensing and HW installations
Payload assembling and transportation procedures and robustness test
Payload control
READY FOR A DECISION
n
PRODUCTION AND INSTALLATION OF THE FOUR PAYLOAD COM PONENTS
DEFINITION AND TEST OF THE M OUNTING PROCEDURES
Four mirror preparation
M irror preparation procedures
Preparation of the four marionette Payload assembling and transportation procedures
PRODUCTION reaction masses
Preparation of the four AND INSTALLATION OF THE FOUR PAYLOAD COM PONENTS
M irror safety structure Four mirror preparation
g
Ears purchasing
New assembling structure
Ears, markers and magnets bonding
Fibre production and characterization
Preparation of the four marionette
M arionettes production
M arionettes assembling and cabling
Preparation of the four reaction masses
Coils and cables purchasing
Reference masses production
Reference masses cabling
M irror safety structure
New assembling structure
Thanks
for your
attention!
