►Suspension records

ITMX

attachment:ITMX_OSEM.png

Satellite Box #105

ITMY

Satellite Box #???

attachment:ITMY_OSEM.png

PRM

Short OSEMs

Satellite Box #???

attachment:PRM_OSEM.png

SRM

Short OSEMs

Satellite Box #???

attachment:SRM_OSEM.png

►ITM Suspensions

The ITMs are being changed into SOS. For this we will need to fab 2 SOS towers. We will re-use existing OSEMs and misc in-vac hardware.

SOS Updates (Mostly ITMs, but where applicable, extra parts for other new Optics):

• 29 Oct 2009 - Most of the parts are here, only the EQ stops are left to be dealt with. Most of this stuff needs to visit Bob's lab for cleaning.
• 30 Oct 2009 - Screws for EQ stops ordered. Also, fixtures should be sent from MIT ~today, so we should get them soon.
• 3 Nov 2009 - Most of the screws for EQ stops have arrived (a few were backordered, and will be here shortly). Now I need to drill them / have the shop drill them for the viton.
• 5 Nov 2009 - Most of the 6-32 screws have been drilled for the viton. The 1/4-20 3/4" screws have arrived, but the 1/4-20 1.5" screws won't be here until early December.
• 17 Nov 2009 - 50 of the 1/4-20 3/4" screws have been drilled. The 1/4-20 1.25" screws arrived, and need drilling. Also, the wire standoffs and guiderods have arrived from the shop. They just need to be cleaned (just like all the other stuff).
• 20 Dec 2009 - All of the remaining needed EQ stop screws have been drilled.
• 28 Dec 2009 - Another email sent to Tim @ MIT to check on the status of the Guide Rod fixture...he said he has it and would send it, but it hasn't arrived here yet.
• 4 Jan 2010 - Bob has started cleaning all of the suspension hardware. Guide Rod Fixture from MIT has arrived.
• 6 Jan 2010 - Since the ETMs will also be SOS, we need to have 2 more towers fabricated, and then cleaned. Some of the hardware (washers, screws etc) we have enough for all 4 new towers, but much of it will need to be manufactured. Koji is in charge of this.
• 11 Jan 2010 - All the SOS stuff is cleaned and baked, ready to start gluing and assembling. We need to get EPOXY and a WINCH FIXTURE, but other than that we're pretty much ready to start assembling the 2 ITM towers.

Gluing configuration

attachment:mirror_gluing.png

►Tip/Tilt Suspensions

For the PRC/SRC folding we will use Tip/Tilt stages modified to be used passively. No active damping, no coil drive. Just magnets and natural eddy current damping.

We have got five initial TT delivery. 4 is for the PRC/SRC folding. 1 is for tests/spare. We would employ 4 more TTs for the Input/Output steering, though we should seriously consider the foot prints of them.

[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=7074 Bram's TT assembly document on the dcc]

[http://ilog.ligo-wa.caltech.edu:7285/advligo/Tip-Tilt_Stage/Tip-Tilt_Mechanical_Design Bram's TT wiki / drawings]

We will employ vertical springs designed by Valera@LLO. Mike@LLO suggested the items additionally needed for attaching the vertical springs.

There was a problem of the backplane. A beam of the backplane blocked the laser light goes through the TT optic. attachment:TT_crosssection.png

The design has been modified to address this issue. The modified design is here. attachment:TT_ECD_Drawings_for_40m_100215.pdf

Baking order to Bob: attachment:TTparts_2010-03-11_K_Arai.xls

Magnets: 10mm dia. 10mm thick SmCo magnet pressed in the mirror holder.

Wires: <200um musical wire for the mirror suspension / Bram will give us tungsten wires.

Titanium screws: We try grade 3 cheap Ti screws (#2-56 3/8") ~$1.3ea (c.f. McMaster ~$15ea)

To Do: Wire Jig drawing

►Other suspensions

We will realign the MC suspensions so that we are centered on the mirrors this time.

The PRM, SRM, and BS will remain SOS. No new towers.The ETMs will be replaced to the SOSs later. They exist on the flow bench at the Yend.