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| = Green Laser Injection for Arm Pre-Lock = | ## page was renamed from Upgrade 09/GreenLock <<Anchor(TOP)>> |
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| We plan to install green lasers, which are phase locked to the PSL laser, at each end station to pre-lock the arm cavities before the lock acquisition. | . attachment:god_of_green.png |
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| == Basic Concept == == Noise Requirements == I'd say the arm cavity length should not change more than 1/100 of the resonance width in the time scale of 10sec. For this to be fulfilled, the RMS change of the cavity length must be suppressed below 1e-11m level. Does this make sense ? |
= Overview = The diagrams below show a conceptual design of the green locking technique <<ImageLink(green_vertex_preliminary_design.png,Upgrade 09/GreenLock/Preliminary design for the vertex,height=200)>> <<ImageLink(green_ETM_preliminary_design.png,Upgrade 09/GreenLock/Preliminary design for the end,height=200)>> = Plans = ||<|3> ''' long term plans ''' || ''' action item list ''' || [:Upgrade 09/GreenLock/action_item_list] || ||- - - - || - - - - || ||- - - - || - - - - || ||<|3> ''' near term plans ''' ||'''January 2011''' || [:Upgrade 09/GreenLock/January_2011] || ||- - - - || - - - - || ||- - - - || - - - - || ||<|3> ''' past plans ''' ||''' October 2010''' || [:Upgrade 09/GreenLock/October_2010] || || ''' November 2010 '''||[:Upgrade 09/GreenLock/October_2010] || || - - - - || - - - - || [[BR]] = Developer's page = ||''' Optical Layout '''|| ([attachment:green_optics.png Table]/ In-vac) || || ''' end table ''' || [[Upgrade 09/GreenLock/end table|ETM / end table]] || || ''' end table ''' || <<ImageLink(endtable.jpg,Upgrade 09/GreenLock/end_table)>> || || ''' Lasers ''' || [[Advanced_Techniques/Green_Locking|Lasers]] || || ''' wedge effect ''' || [[Upgrade 09/Optical Layout#wedge|ITM wedge effect]] || || ''' in-vac ''' || [[Upgrade 09/Optical Layout|Periscopes for beam steering from PR3/SR3 transmissions to the PSL viewport]] || || ''' Mode matching ''' || ([attachment:modematch_END.png mode matching at end table]) || || ''' Electronics ''' || [:Upgrade 09/GreenLock/Electronics] || || ''' sensing and control ''' || [:Upgrade 09/GreenLock/Control Information] || || ''' about the doubling oven ''' || [attachment:PV40.pdf drawing of PV40 oven], [attachment:PVP2.pdf drawing of the base plate PVP2], [attachment:manual_oven.pdf manual for the covesion oven] || || ''' noise requirements ''' ||[:Upgrade 09/GreenLock/Noise Requirement] || || ''' purchase list ''' || [:Upgrade 09/Purchase List/Green Locking] || = Links = || ''' aLIGO ALS wiki ''' || http://ilog.ligo-wa.caltech.edu:7285/advligo/Arm_Length_Stabilisation || || ''' Description of the optical / servo configuration ''' || https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=6888 || || ''' Servo modeling (!SimLink) ''' || https://nodus.ligo.caltech.edu:30889/svn/trunk/docs/upgrade08/Green_Locking/Servo_modeling/ || |
- attachment:god_of_green.png
Overview
- The diagrams below show a conceptual design of the green locking technique
Plans
long term plans |
action item list |
[:Upgrade 09/GreenLock/action_item_list] |
- - - - |
- - - - |
|
- - - - |
- - - - |
|
near term plans |
January 2011 |
[:Upgrade 09/GreenLock/January_2011] |
- - - - |
- - - - |
|
- - - - |
- - - - |
|
past plans |
October 2010 |
[:Upgrade 09/GreenLock/October_2010] |
November 2010 |
[:Upgrade 09/GreenLock/October_2010] |
|
- - - - |
- - - - |
Developer's page
Optical Layout |
([attachment:green_optics.png Table]/ In-vac) |
end table |
|
end table |
|
Lasers |
|
wedge effect |
|
in-vac |
Periscopes for beam steering from PR3/SR3 transmissions to the PSL viewport |
Mode matching |
([attachment:modematch_END.png mode matching at end table]) |
Electronics |
[:Upgrade 09/GreenLock/Electronics] |
sensing and control |
[:Upgrade 09/GreenLock/Control Information] |
about the doubling oven |
[attachment:PV40.pdf drawing of PV40 oven], [attachment:PVP2.pdf drawing of the base plate PVP2], [attachment:manual_oven.pdf manual for the covesion oven] |
noise requirements |
[:Upgrade 09/GreenLock/Noise Requirement] |
purchase list |
[:Upgrade 09/Purchase List/Green Locking] |
Links
aLIGO ALS wiki |
http://ilog.ligo-wa.caltech.edu:7285/advligo/Arm_Length_Stabilisation |
Description of the optical / servo configuration |
https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=6888 |
Servo modeling (SimLink) |
https://nodus.ligo.caltech.edu:30889/svn/trunk/docs/upgrade08/Green_Locking/Servo_modeling/ |