The AEI 10 m prototype interferometer Stefan Goßler for the 10 m prototype team DPG, March 2009
Jan 13, 2016
The AEI10 m prototype interferometer
Stefan Goßler for the 10 m prototype team
DPG, March 2009
203.03.2009 The AEI 10 m prototype interferometer
Purpose of our prototype
Ultra-low displacement noise test environment to probe at and beyond the Standard Quantum Limit (SQL)
for of order 100 g to kilogram scale masses
Maximal overlap with GEO-HF subsystems develop and prove as many of the techniques needed for GEO 600
upgrades as possible (e.g. laser, digital control infrastructure) provide training for people who will install and run GEO-HF
303.03.2009 The AEI 10 m prototype interferometer
Vacuum system
Roughing: One 170 l/s screw pumpMain pumps: Two 2000 l/s turbo-molecular pumps
Backing and differential pumping: Two scroll pumps10-6
mbar after about 12 hours
Tanks:3 m diameter, 3.4 m tall
Tubes:1.5 m diameter
Volume ca. 100 m3 22 t stainless steel
403.03.2009 The AEI 10 m prototype interferometer
In the prototype hall
180° view
503.03.2009 The AEI 10 m prototype interferometer
603.03.2009 The AEI 10 m prototype interferometer
Walk-in tanks
03.03.2009
600 mm flangesto fit viewports
100 mm flangesto fit feed throughs
100 mm flangesto fit feed throughs
703.03.2009 The AEI 10 m prototype interferometer
Isolated optical tables
GAS Filters
Inverted pendulum legs
Experimental platform
See next talk by Katrin Dahl
for full detailsPrototype of passive isolation table at MIT
LASTI HAM-SAS
803.03.2009 The AEI 10 m prototype interferometer
Suspension platform interferometer
Digital signals from FPGAs need custom interface to digital control system
Based on LISA Pathfinder phase meter
Mach-Zehnder interferometer with unequal arm length (by 20 m), requires stable laser to reach design sensitivity of 100 pm/sqrt(Hz) @ 10 mHz: Iodine-stabilised Nd:YAG
Thermal drift requires components to be bonded onto plate with low CTE
See talk by Oliver Kranz
Q31.4 for full details
903.03.2009 The AEI 10 m prototype interferometer
Mirror suspensions
Uppermass
Secondmass
Penultimatemass
MirrorPre-installed suspension
cartridgeMonolithic last stage
100 g mirror, four 20 µm silica fibres
1003.03.2009 The AEI 10 m prototype interferometer
• Crystals: 3 x 3 x 10 mm3 Nd:YVO4 8 mm 0,3 % dot.2 mm undoped endcap
• Pump diode: 808 nm, 45 W400 µm fiber diameterNA=0,22
• Amplifier: 38 W for 2 W seed and 150 W pump
/4
/2
NPRO
Isolator
Nd:YVOcrysta ls
4
pum poptics
/4
/2
NPRO
Isolator
Nd:YVOcrysta ls
4
pum poptics
Light source: 35 W @ 1064 nm
1103.03.2009 The AEI 10 m prototype interferometer
Digital control
Based on real-time Linux system and EPICS software
Experiment
sensors &
actuators
Field box Front end WorkstationExpansionchassis
Timing slave
Timing master
GPS clock
6 x 32 channel PCI-X DA/AD & DIO
Opteron based,64bit real-time Linux
Framebuilder
Fibre link forreal-time network
Signal conditioningAA/AI
Linux,Simulink
based input
10 GHz
1203.03.2009 The AEI 10 m prototype interferometer
Optical layout
Frequency reference cavityLength: 12 m
Finesse: ca. 7500Triple pendulum suspension
Mirror mass: 860 g
10 m Fabry-Perot arm cavityFinesse ca. 700
100 g Mirrorsmonolithic silica suspensions
Optional:Power recycling
~35 W input @ 1064 nmOptional:
Signal recycling
Anti-resonantFabry-Perot cavity
as compound end mirror
Tap off~130 mW
See talk by Fumiko Kawazoe
about reference cavity
Noise budget
1303.03.2009 The AEI 10 m prototype interferometer
1403.03.2009 The AEI 10 m prototype interferometer
The teamKen Strain: Scientific leaderStefan Goßler: CoordinatorKasem Mossavi: Vacuum system and pumps controlJens Breyer: Mechanical designBenno Willke: High power laserGerhard Heinzel: LISA/LPF related experimentsYanbei Chen, Kentaro Somiya, Stefan Danilishin, Henning Rehbein, Helge Müller-Ebhardt: Noise analysis, experiment designRoman Schnabel: Squeezing and QND experimentsHarald Lück: Vacuum system and GEO 600 related experimentsHartmut Grote: Electronics and GEO 600 related experimentsGerrit Kühn, Michael Born, Martin Hewitson: Real time control systemGEO operators: Filter design and construction, environmental monitoring Andreas Weidner: Electronics designHenning Ryll: Laser and fibre-modecleanerKatrin Dahl (PhD), Oliver Kranz (diploma): Suspension platform interferometer Bob Taylor (postdoc): Seismic isolation and controlAlexander Wanner (PhD): Inertial controlFumiko Kawazoe (postdoc): Frequency reference cavity and global controlAlessandro Bertolini: Seismic isolationTobias Westphal (PhD): Monolithic suspensionsChristian Gräf (PhD): RT controlThomas Brockt (Diploma): Power supplies and voltage distributionDaniel Gering (Diploma): Interface Phase Meter - CDS