ILIAS WG1 meeting Han/Ruthe

Harald LückHarald Lück

ILIAS WG1 meeting, Sep. 2004, Hannover/Ruthe

GEO Status (Update)

ILIAS WG1 meeting Han/Ruthe

Installation Status

12W lasermode cleaner

interferometer with dual recycling

output mode cleaner

detector

attenuated to 2W

MPR ~1% Transmissi

on

ILIAS WG1 meeting Han/Ruthe

Sensitivity changes between WG1 meetings

ILIAS WG1 meeting Han/Ruthe

Changes since last meeting

• installation of suspended output optics

• HPD in separate vacuum vessel

• new sensor (HPD) for MI length control

• 2f local oscillator (optional)

• new gain distribution in MI length control

ILIAS WG1 meeting Han/Ruthe

Output optics / vacuum tank high-power diode - TCOc

MSR

BDO2

BDO1

BDO3

BDOMCa

BDOMCb

OMC

PDO

PDOMCa

PDOMCb

PDOT

Output MC not installed (yet?)

ILIAS WG1 meeting Han/Ruthe

central building / control room

W/O output optics Stomp in Ctrl. room

ILIAS WG1 meeting Han/Ruthe

Noise Projections: the analytical way

102

103

10-22

10-21

10-20

10-19

10-18

10-17

Frequency [Hz]

hP(f)MID IM FBMID AA ROTMID AA TILTMID CAL InjMID elec FBMID FB HVAHPD darkSRC FB MSRShot DC IPDPR ampPDOHP amp

ILIAS WG1 meeting Han/Ruthe

Changing MID loop electronics

ILIAS WG1 meeting Han/Ruthe

Changing SR loop – UG ~35Hz

ILIAS WG1 meeting Han/Ruthe

‘2f LO’ for MID Demodulation

ILIAS WG1 meeting Han/Ruthe

Laser amplitude noise & stab.

Red = Inner and outer loop running Blue = only inner loop running Green = both loops off

ILIAS WG1 meeting Han/Ruthe

Variation of SR Modulation Index

ILIAS WG1 meeting Han/Ruthe

Effect of changing the heater power

ILIAS WG1 meeting Han/Ruthe

ROC- Correction of MFe

71W

OptimalCompensationContrast enhanced

ILIAS WG1 meeting Han/Ruthe

Sensitivity for changing ROC of MFE

ILIAS WG1 meeting Han/Ruthe

GEO600 next steps

repairing leak in central building Set up new office container improve sensitivity towards S4 increase injected power increase power recycling factor

lock acquisition might cause problems simulations and testing needed, maybe OMC

required

ILIAS WG1 meeting Han/Ruthe

construction work

ILIAS WG1 meeting Han/Ruthe

Central Building

new office container

6 desks, common area

toillets

ILIAS WG1 meeting Han/Ruthe

GEO600 next steps

repairing leak in central building (almost done) Set up new office container improve sensitivity towards S4 increase injected power implement segmented heater increase power recycling factor (300 -> 2000)

lock acquisition might cause problems simulations and testing needed, maybe OMC

required