h 16:00 CEST

Calling instructions:

Title:        AdV-squeez
Description:
Community:    Virgo - LSC
Password:    Adv-squeez
Meeting type: Open Meeting (Round Table)

Meeting Access Information:
     SeeVoghRN Application 
http://research.seevogh.com/joinSRN?meeting=MeMMMu2a2tD8DI9D9uDv9e
     WebStart (Java) 
http://research.seevogh.com/join?meeting=MeMMMu2a2tD8DI9D9uDv9e
     Mobile App :  Meeting ID: 708 9462   or  Link: 
http://research.seevogh.com/join?meeting=MeMMMu2a2tD8DI9D9uDv9e

Minutes by J.-P. Zendri

Back to TopPage.

AGENDA

Announcements

Topics

General discussion about the TDR.

MINUTES

Attendance

Chua, Degallaix, DeLaurentis, Gemme, Naticchioni, Rocchi, Sequino,  Zendri

Announcements

Topics

Sensitivity curve:

The GWINC simulations are confirmed to have been correctly made using the updated (expected) AdV parameters. (Sheon)

From early simulations, it seems that at low frequency (say below 100 Hz in the case of AdV), the squeezed light can only worsen the sensitivity (due to the antisqueezing) even using the filter cavity the sensitivity does not improve significantly (Jean-Pierre). This aspect needs to be studied further (Sheon).

The signal recycling mirror optimization of the reflectivity with squeezing should not substantially change the sensitivity curve (Sheon).

Despite that, compared to LIGO, our goal is less ambitious we cannot think to do a shorter monolithic filter cavity. This is because the filter cavity length, together with the cavity optical losses determines the frequency where we rotate the squeezing ellipse. With rotation needed at about 100 Hz for both Virgo and LIGO, shorter filter cavity lengths make the cavity mirror requirements extremely challenging. (Sheon).

The chapter of the simulations will be initially focused on the “risk mitigation”. (Jean-Pierre, Jerome, Gianluca)

SHG

For the next week a new updated version of the SHG chapter will be delivered (Martina).

OPO

The chapter on OPO has yet to be presented. For next week is expected the first version (Valeria).

Homodyne

For the next week a new updated version of the Homodyne chapter will be delivered (Luca).

Electronic and controls

In the next meeting Jean-Pierre will present the state of the chapter electronic and controls (Jean-Pierre).

Question (Jean-Pierre): Do we have to include in the TDR a detailed design of the squeezer optical bench (lens position and focal length, mirrors reflectivity, ROC, position..). Perhaps we don’t need to specify all the details because it's probably something we'll have to change during construction (Jerome).  (Jean-Pierre) In agreement with Jerome for the injection but perhaps for the squeezer we are already able to give all the details. Decision postponed.

Injection

PROBLEM to be addressed: The people currently in charge to write this chapter are all heavily involved in the AdV construction and commissioning. So who will write the chapter?

Next meeting

Presentation  of chapter 6 (J.P. Zendri)

Draft of chapter 3 (OPO) and chapter 1 (Sensitivity)

Improved version of chapter SHG and Homodyne

Back to TopPage.