Differences between revisions 45 and 47 (spanning 2 versions)

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
attachment:green.png complete	attachment:orange.png intermediate state	attachment:red.png nothing happened	attachment:black.png 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	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

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

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

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

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:orange.png	what is the dominant noise source

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

-  ⇤ ← Revision 45 as of 2011-09-23 05:44:50 → 
  Size: 4321
  Editor: KiwamuIzumi
  Comment:
+   ← Revision 47 as of 2011-09-23 05:46:53 → ⇥
  Size: 4345
  Editor: KiwamuIzumi
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 26:
-||||||||||||
+[[BR]][[BR]]
-Line 33:
+Line 36:
-||||||||||||
+[[BR]][[BR]]
-Line 41:
+Line 47:
-||||||||||||
+[[BR]][[BR]]
-Line 50:
+Line 60:
-||||||||||||
+[[BR]]
[[BR]]
-Line 55:
+Line 67:
-|| 5-C || perform the same measurement while X arm is locked to IR || ||<:>attachment:prange.png || what is the dominant noise source ||
+|| 5-C || perform the same measurement while X arm is locked to IR || ||<:>attachment:orange.png || what is the dominant noise source ||