Differences between revisions 47 and 48

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 ?

Action Items

Indicators
complete	intermediate state	nothing happened	gave up

Step 1. X arm alignment for IR
	action	description	status	notes
1-A	setup DC_PD at an available port	to find a fringe		put Thorlabs PDA255 at AS
1-B	align BS, ITMX and ETMX	to have TEM00 flash		put a camera at ETMX_TRANS
1-C	place TRANS_MON_PD and QPD
1-D	hook it up TRANS_MON and QPD to ADC	`c1iscex`
1-E	make a simple mod/demod system	to lock the IR
1-F	feeding back the signal to MCL	to lock the IR
1-G	add a LOCKIN module into `c1sus` and `c1iscex`	for A2L
1-H	A2L for IR	for precise alignment		C1ASS does

Step 2. Re-alignment of green
	action	description	status	notes
2-A	change beam axis	steer the mirrors at X end
2-B	rearrange the optical setup at X end	if necessary
2-C	lock the green to X arm
2-D	more precisely overlap the green beam axis to the IR	using A2L

Step 3. Beat note detection
	action	description	status	notes
3-A	finalize the setup at PSL table	Electronics, cables and etc.,..		we need some dedicated power cables
3-B	alignment of optics at PSL table
3-C	temperature tuning of the lasers
3-D	check frequency counter			frequency resolution not sufficient (~ 7.5kHz)
3-E	phase lock the VCO

Step 4. Digital control to stabilize the PSL
	action	description	status	notes
4-A	connect VCO signal to ADC	`c1ioo` or `c1lsc`
4-B	connect some monitor signals to ADC	green refl, trans, ..etc.,
4-B	simulink model refinement
4-C	DAQ setting
4-D	add RFM for feedingback to MC2
4-E	medm screen

Step 5. measurement
	action	description	status	notes
5-A	cavity scan	adding offsets onto MC2 feedback
5-B	measure the stability of beat note and IR PDH
5-C	perform the same measurement while X arm is locked to IR			what is the dominant noise source

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

-  ⇤ ← Revision 47 as of 2011-09-23 05:46:53 → 
  Size: 4345
  Editor: KiwamuIzumi
  Comment:
+   ← Revision 48 as of 2012-01-03 23:02:44 → ⇥
  Size: 4493
  Editor: localhost
  Comment: converted to 1.6 markup
-Deletions are marked like this.
+Additions are marked like this.
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-[[BR]]
+<<BR>>
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-||attachment:green.png '''complete'''|| attachment:orange.png '''intermediate state ''' || attachment:red.png '''nothing happened''' || attachment:black.png gave up||
+||{{attachment:green.png}} '''complete'''|| {{attachment:orange.png}} '''intermediate state ''' || {{attachment:red.png}} '''nothing happened''' || {{attachment:black.png}} gave up||
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-[[BR]]
[[BR]]
+<<BR>>
<<BR>>
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-|| 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||
+|| 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||
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-[[BR]][[BR]]
+<<BR>><<BR>>
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-|| 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 || ||
+|| 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}} || ||
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-[[BR]][[BR]]
+<<BR>><<BR>>
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-|| 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 ||  ||
+|| 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}} ||  ||
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-[[BR]][[BR]]
+<<BR>><<BR>>
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-|| 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]]
+|| 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>>
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-|| 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:orange.png || what is the dominant noise source ||
+|| 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:orange.png}} || what is the dominant noise source ||