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= Plan for January =
== GOAL of this month ==
 . to stabilize the arm displacement using the green beat note		 ## page was renamed from Upgrade 09/GreenLock/January 2011
= GOALs of this month =
 . '''1. to stabilize the PSL by taking the green beat note signal and actuating the MC length while assuming the X arm is a stable reference '''
 . '''2. to measure the stability of the beat note and to compare it with that of the IR PDH signal '''
 . ''' => above two actions finally answer the question : the green locking is stable enough to hand off the control servo to IR or not ?'''
[[BR]]


= Action Items =

||||||||<tablestyle="width: 80%">'''''Indicators'''''||
||attachment:green.png '''complete'''|| attachment:orange.png '''intermediate state ''' || attachment:red.png '''nothing happened''' || attachment:black.png gave up||

[[BR]]
[[BR]]
||||||||||<tablestyle="width: 80%">'''''Step 1. X arm alignment for IR '''''||
|| ||<:>''''' action ''''' ||<:>''''' description ''''' ||<:> ''''' status ''''' ||<:> ''''' notes '''''||
|| 1-A ||setup DC_PD at an available port || to find a fringe ||<:>attachment:green.png || attachment:help.png put Thorlabs PDA255 at AS ||
|| 1-B || align BS, ITMX and ETMX ||to have TEM00 flash ||<:>attachment:green.png || put a camera at ETMX_TRANS ||
|| 1-C || place TRANS_MON_PD and QPD|| ||<:>attachment:orange.png || ||
|| 1-D || hook it up TRANS_MON and QPD to ADC|| {{{ c1iscex }}}||<:>attachment:green.png || ||
|| 1-E ||make a simple mod/demod system || to lock the IR ||<:>attachment:green.png ||attachment:help.png ||
|| 1-F || feeding back the signal to MCL || to lock the IR ||<:>attachment:green.png || attachment:help.png ||
|| 1-G || add a ''LOCKIN'' module into {{{c1sus}}} and {{{c1iscex}}}|| for A2L ||<:>attachment:orange.png || ||
|| 1-H || A2L for IR || for precise alignment ||<:>attachment:green.png || C1ASS does||

[[BR]][[BR]]


||||||||||<tablestyle="width: 80%">'''''Step 2. Re-alignment of green '''''||
|| ||<:>''''' action ''''' ||<:>''''' description ''''' ||<:>''''' status ''''' ||<:> ''''' notes '''''||
|| 2-A ||change beam axis ||steer the mirrors at X end ||<:>attachment:green.png || attachment:help.png ||
|| 2-B || rearrange the optical setup at X end || if necessary ||<:>attachment:green.png || ||
|| 2-C || lock the green to X arm || ||<:>attachment:green.png || ||
|| 2-D || more precisely overlap the green beam axis to the IR || using A2L ||<:>attachment:green.png || ||

[[BR]][[BR]]


||||||||||<tablestyle="width: 80%">'''''Step 3. Beat note detection '''''||
|| ||<:>''''' action ''''' ||<:>''''' description ''''' ||<:>''''' status ''''' ||<:> ''''' notes '''''||
|| 3-A ||finalize the setup at PSL table || Electronics, cables and etc.,.. ||<:>attachment:orange.png || we need some dedicated power cables ||
|| 3-B ||alignment of optics at PSL table || ||<:>attachment:green.png || ||
|| 3-C ||temperature tuning of the lasers || ||<:>attachment:green.png || attachment:help.png ||
|| 3-D || check frequency counter || ||<:>attachment:orange.png || attachment:help.png frequency resolution not sufficient (~ 7.5kHz) ||
|| 3-E || phase lock the VCO || ||<:>attachment:green.png || ||


[[BR]][[BR]]


||||||||||<tablestyle="width: 80%">'''''Step 4. Digital control to stabilize the PSL '''''||
|| ||<:>''''' action ''''' ||<:>''''' description ''''' ||<:>''''' status ''''' ||<:>''''' notes '''''||
|| 4-A ||connect VCO signal to ADC || {{{ c1ioo }}} or {{{ c1lsc }}} ||<:>attachment:green.png|| attachment:help.png ||
|| 4-B || connect some monitor signals to ADC || green refl, trans, ..etc., ||<:>attachment:red.png || ||
|| 4-B ||simulink model refinement || ||<:>attachment:green.png|| ||
|| 4-C || DAQ setting || ||<:>attachment:green.png || ||
|| 4-D || add RFM for feedingback to MC2 || ||<:>attachment:red.png|| ||
|| 4-E || medm screen || ||<:>attachment:orange.png|| ||
[[BR]]
[[BR]]

||||||||||<tablestyle="width: 80%">'''''Step 5. measurement '''''||
|| ||<:>''''' action ''''' ||<:>''''' description ''''' ||<:>''''' status ''''' ||<:>''''' notes '''''||
|| 5-A || cavity scan || adding offsets onto MC2 feedback ||<:>attachment:green.png|| ||
|| 5-B || measure the stability of beat note and IR PDH || ||<:>attachment:green.png|| ||
|| 5-C || perform the same measurement while X arm is locked to IR || ||<:>attachment:prange.png || what is the dominant noise source ||
||||||||||<tablestyle="width: 80%">'''''Step 5. measurement '''''||
|| ||<:>''''' action ''''' ||<:>''''' description ''''' ||<:>''''' status ''''' ||<:>''''' notes '''''||
|| 5-A || cavity scan || adding offsets onto MC2 feedback ||<:>attachment:green.png|| ||
|| 5-B || measure the stability of beat note and IR PDH || ||<:>attachment:green.png|| ||
|| 5-C || perform the same measurement while X arm is locked to IR || ||<:>attachment:prange.png || what is the dominant noise source ||

GOALs of this month

  • 1. to stabilize the PSL by taking the green beat note signal and actuating the MC length while assuming the X arm is a stable reference

  • 2. to measure the stability of the beat note and to compare it with that of the IR PDH signal

  • => above two actions finally answer the question : the green locking is stable enough to hand off the control servo to IR or not ?

BR

Action Items

Indicators

attachment:green.png complete

attachment:orange.png intermediate state

attachment:red.png nothing happened

attachment:black.png gave up

BR BR

Step 1. X arm alignment for IR

action

description

status

notes

1-A

setup DC_PD at an available port

to find a fringe

attachment:green.png

attachment:help.png put Thorlabs PDA255 at AS

1-B

align BS, ITMX and ETMX

to have TEM00 flash

attachment:green.png

put a camera at ETMX_TRANS

1-C

place TRANS_MON_PD and QPD

attachment:orange.png

1-D

hook it up TRANS_MON and QPD to ADC

 c1iscex 

attachment:green.png

1-E

make a simple mod/demod system

to lock the IR

attachment:green.png

attachment:help.png

1-F

feeding back the signal to MCL

to lock the IR

attachment:green.png

attachment:help.png

1-G

add a LOCKIN module into c1sus and c1iscex

for A2L

attachment:orange.png

1-H

A2L for IR

for precise alignment

attachment:green.png

C1ASS does

BRBR

Step 2. Re-alignment of green

action

description

status

notes

2-A

change beam axis

steer the mirrors at X end

attachment:green.png

attachment:help.png

2-B

rearrange the optical setup at X end

if necessary

attachment:green.png

2-C

lock the green to X arm

attachment:green.png

2-D

more precisely overlap the green beam axis to the IR

using A2L

attachment:green.png

BRBR

Step 3. Beat note detection

action

description

status

notes

3-A

finalize the setup at PSL table

Electronics, cables and etc.,..

attachment:orange.png

we need some dedicated power cables

3-B

alignment of optics at PSL table

attachment:green.png

3-C

temperature tuning of the lasers

attachment:green.png

attachment:help.png

3-D

check frequency counter

attachment:orange.png

attachment:help.png frequency resolution not sufficient (~ 7.5kHz)

3-E

phase lock the VCO

attachment:green.png

BRBR

Step 4. Digital control to stabilize the PSL

action

description

status

notes

4-A

connect VCO signal to ADC

 c1ioo  or  c1lsc 

attachment:green.png

attachment:help.png

4-B

connect some monitor signals to ADC

green refl, trans, ..etc.,

attachment:red.png

4-B

simulink model refinement

attachment:green.png

4-C

DAQ setting

attachment:green.png

4-D

add RFM for feedingback to MC2

attachment:red.png

4-E

medm screen

attachment:orange.png

BR BR

Step 5. measurement

action

description

status

notes

5-A

cavity scan

adding offsets onto MC2 feedback

attachment:green.png

5-B

measure the stability of beat note and IR PDH

attachment:green.png

5-C

perform the same measurement while X arm is locked to IR

attachment:prange.png

what is the dominant noise source

Step 5. measurement

action

description

status

notes

5-A

cavity scan

adding offsets onto MC2 feedback

attachment:green.png

5-B

measure the stability of beat note and IR PDH

attachment:green.png

5-C

perform the same measurement while X arm is locked to IR

attachment:prange.png

what is the dominant noise source

Advanced_Techniques/Green_Locking/January_2011 (last edited 2012-01-03 23:02:44 by localhost)