Contents

List of Common Mode Servo Boards
Block Diagram
Oscillation Issue
List of variants
History
Old information (before O4a)

List of Common Mode Servo Boards

This is a list of Common Mode Servo Boards (JGW-D1503567). Here, several different variants of CMSB are summarized.

Board S/N	Chassis S/N	CMS Board JGW	Assembled Chassis JGW	Use	Version	Additional Changes	Current Place	Confirmed Date	Remarks
	001		S1503859	MZI	Default?	unknown	PSL room
003	002	JGW-S1605803	S1605810	IMC	Default	no changes made in signal path	IOO rack	2018.08.21(Nakano, Enomoto) 2021.04.15(YamaT)
004	003	JGW-S1605803	S1605811	CARM (tentative) FIB X	CARM ver1		Circuit Room (Mozumi) ALS0 rack	2018.08.16 (Enomoto)
005	004	JGW-S1605804	S1605812	PLL X (tentative) FIB Y	PLL ver1		ALS0 rack	2018.09.28 (Enomoto)
006	005	JGW-S1605805	S1605813	Gr PDH X (tentative) Gr PDH Y	Gr PDH ver1		LSC0 rack	2018.09.28 (Enomoto)
???	???	JGW-S1809472	S1809500	Gr PDH X			LSC0 rack
???	???	JGW-S1809460	S1809505	PLL X			ALS0 rack
???	???	JGW-S???????	S1809501	PLL Y			ALS0 rack
???	???	JGW-S???????	S1809504	CARM			ALS1 rack
???	???	JGW-S1809477	S1809503	Summing node			ALS1 rack

Block Diagram

CMSB Block Diagram

LIGO-D1002416

Oscillation Issue

Oscillation issue

List of variants

JGW-D1503705: CM Servo Chassis Assembly
JGW-D1503567: CM Servo Board
JGW-G1808540: Modification for CARM
JGW-G1808482: Modification for PLL and GrPDH

	IMC	CARM	PLL	FIB	GrPDH	Summing
Chassis	S1605810 (002)	S1809504 (???)	S1809501 (???) for X	S1605811 (003) for X	S1809506 (???) for X	S1809503 (???)
Chassis	S1605810 (002)	S1809504 (???)	S2415893 (???) for Y	S1809509 (???) for Y	S1809500 (???) for Y	S1809503 (???)

Board	S1605802 (003)	Sxxxxxxx (???)	Sxxxxxxx (???) for X	S1605803 (004) for X	S1809465 (???) for X	S1809477 (???)
Board	S1605802 (003)	Sxxxxxxx (???)	S1809467 (???) for Y	S1809464 (???) for Y	S1809472 (???) for Y	S1809477 (???)
Mixer DAQ
Generic	g:100	g:100	g:100	g:100	g:100	g:100
	`default`	`default`	`default`	`default`	`default`	`default`

Common
Compensation	p:40Hz / z:4kHz	p:40Hz / z:4kHz	p:40Hz / z:4kHz	p:40Hz / z:4kHz	p:40Hz / z:400Hz	p:40Hz / z:48kHz
	`default`	`default`	`default`	`default`	`R70:12k`	`R68:12k, R70:100, C121:33n`
					klog#5804

Boost 1	p:1kHz / z:20kHz	p:10Hz / z:1kHz	p:0Hz / z:10Hz	p:10Hz / z:1kHz	p:10Hz / z:1kHz	p:10Hz / z:1kHz
	`default`	`R72:15k, R77:165, C118:1000n`	`R72:omit, R77:15k, C118:1000n`	`R72:15k, R77:165, C118:1000n`	`R72:15k, R77:165, C118:1000n`	`R72:15k, R77:165, C118:1000n`
		klog#5815	klog#5671	klog#5815	klog#5804

Boost 2	p:1kHz / z:20kHz	p:10Hz / z:1kHz	p:20Hz / z:2kHz	p:10Hz / z:1kHz	p:100Hz / z:1kHz	p:10Hz / z:1kHz
	`default`	`R74:15k, R78:165, C119:1000n`	`R74:8.06k, C119:1000n`	`R74:15k, R78:165, C119:1000n`	`R78:165, C119:1000n`	`R74:15k, R78:165, C119:1000n`
		klog#5815	klog#5671	klog#5815	klog#5804

Boost 3	p:300Hz / z:4.5kHz	p:300Hz / z:4.5kHz	p:20Hz / z:2kHz	p:300Hz / z:4.5kHz	p:300Hz / z:4.5kHz	p:300Hz / z:4.5kHz
	`default`	`default`	`R76:8.06k, R79:82, C120:1000n`	`default`	`default`	`default`
			klog#5671
Slow
Boost	p:4Hz / z:400kHz	p:4Hz / z:400kHz	p:4Hz / z:400kHz	p:4Hz / z:400kHz	p:4Hz / z:400kHz	p:4Hz / z:400kHz
	`default`	`default`	`default`	`default`	`default`	`default`


Compensation	p:4Hz	p:4Hz	p:4Hz	p:4Hz	p:4Hz	p:4Hz
	`default`	`default`	`default`	`default`	`default`	`default`


Generic	g:-0.1	g:1.0	g:1.0	g:1.0	g:1.0	g:1.0
	`R134:0, R138:NL, R141:1k`	`default`	`default`	`default`	`default`	`default`
	klog#11454

Output Offset	g:0.5	g:0.5	g:0.5	g:0.5	g:0.1	g:0.1
	`default`	`default`	`default`	`default`	`R173:91k`	`R173:91k`
					klog#12594	klog#12677

Low pass	p:30kHz	p:100kHz	p:500kHz	p:100kHz	p:500kHz	p:100kHz
	`C261:1.5n`	`default`	`C261:100p`	`default`	`C261:100p`	`default`
	klog#11454		klog#9203
Slow DAQ
Generic	p:100Hz;100Hz / z:10Hz;10Hz	p:100Hz;100Hz / z:10Hz;10Hz	p:100Hz;100Hz / z:10Hz;10Hz	g:1.0	p:100Hz;100Hz / z:10Hz;10Hz	p:100Hz;100Hz / z:10Hz;10Hz
	`default`	`default`	`default`	`C245:NL, C246:NL, C248:NL, C249:NL`	`default`	`default`
				klog#21146
Fast
High pass 1	p:2kHz / z:0Hz	p:5Hz / z:0Hz	p:5Hz / z:0Hz	p:5Hz / z:0Hz	p:5Hz / z:0Hz	g:1.0
	`C275:NL, C279:0.047u`	`default`	`default`	`default`	`default`	`R178:NL, C275:NL, C279:0`
	klog#11454					klog#9921

High pass 2	p:36kHz	p:5Hz / z:0Hz	p:5Hz / z:0Hz	p:5Hz / z:0Hz	p:5Hz / z:0Hz	g:1.0
	`R179:0, R184:0, R187:2k, R188:2k, C290:2.2n`	`default`	`default`	`default`	`default`	`R179:NL, C276:NL, C280:0`
	klog#11454					klog#9921
Fast DAQ
Generic	p:100Hz;100Hz / z:10Hz;10Hz	p:100Hz;100Hz / z:10Hz;10Hz	p:100Hz;100Hz / z:10Hz;10Hz	p:100Hz;100Hz / z:10Hz;10Hz	p:100Hz;100Hz / z:10Hz;10Hz	p:100Hz;100Hz / z:10Hz;10Hz
	`default`	`default`	`default`	`default`	`default`	`default`

Others
modify 1						cut connection between COMMON and FAST
						`cut #4 and #7 pins of U47`
						klog#9921

modify 2						bypass from IN2 to FAST path
						`connected TP4 and TP27`
						klog#9921
	IMC	CARM	PLL	FIB	GrPDH	Summing

History

date	comment	klog
2024.09.06	Replaced chassis for PLLY S180905 -> S2415893	klog#31013

Old information (before O4a)

List of Common Mode Servo Boards

This is a list of Common Mode Servo Boards (JGW-D1503567). Here, several different variants of CMSB are summarized.

Board S/N	Chassis S/N	CMS Board JGW	Assembled Chassis JGW	Use	Version	Additional Changes	Current Place	Confirmed Date	Remarks
	001		S1503859	MZI	Default?	unknown	PSL room
003	002	JGW-S1605803	S1605810	IMC	Default	no changes made in signal path	IOO rack	2018.08.21(Nakano, Enomoto) 2021.04.15(YamaT)
004	003	JGW-S1605803	S1605811	CARM (tentative) FIB X	CARM ver1		Circuit Room (Mozumi) ALS0 rack	2018.08.16 (Enomoto)
005	004	JGW-S1605804	S1605812	PLL X (tentative) FIB Y	PLL ver1		ALS0 rack	2018.09.28 (Enomoto)
006	005	JGW-S1605805	S1605813	Gr PDH X (tentative) Gr PDH Y	Gr PDH ver1		LSC0 rack	2018.09.28 (Enomoto)
???	???	JGW-S1809472	S1809500	Gr PDH X			LSC0 rack
???	???	JGW-S1809460	S1809505	PLL X			ALS0 rack
???	???	JGW-S???????	S1809501	PLL Y			ALS0 rack
???	???	JGW-S???????	S1809504	CARM			ALS1 rack
???	???	JGW-S1809477	S1809503	Summing node			ALS1 rack

List of Variants

Red highlighted part: Exceptional Changes

Default

Common Part

	Common Compensation		Common Boost 1			Common Boost 2			Common Boost 3
pole/zero	40Hz/4kHz		1kHz/20kHz			1kHz/20kHz			300Hz/4.5kHz
Parts	R70:1.2k	C121:33n	R72:1.5k	R77:82	C118:100n	R74:1.5k	R78:82	C119:100n	R76:4.99k	R79:374	C120:100n

Slow Part

	Slow Boost	Slow Compensation	Slow Generic	LPF at the last stage
pole/zero	4Hz/400Hz	4Hz pole	gain as -0.1 (klog#11454)	100kHz pole --> 500kHz pole in ver2 --> 30kHz pole (klog#11454)
Parts	C225:330n	C220:330n	R134:0, R138:NL, R141:1k (klog#11454)	C261: 470p --> 100p in ver2 --> C261:1.5n (klog#11454)

Fast Part

	Fast HPF 1	Fast HPF 2
pole/zero	5Hz High pass --> 2kHz High pass (klog#11454)	5Hz High pass --> 36kHz Low pass (klog#11454)
Parts	C275:20u --> C275:NL, C279:0.047u (klog#11454)	C276:20u --> R179:0, R184: 0, R187:2k, R188: 2k, C290: 2.2n (klog#11454)

MZI

Common Part

	Common Compensation		Common Boost 1			Common Boost 2			Common Boost 3
pole/zero	40Hz/4kHz		10Hz/400Hz			10Hz/400Hz			1Hz/100Hz
Parts	R70:1.2k	C121:33n	R72:15k	R77:390	C118:1000n	R74:15k	R78:390	C119:1000n	R76:150k	R79:1.5k	C120:1000n

Slow Part

	Slow Boost	Slow Compensation
pole/zero	4Hz/400Hz	4Hz pole
Parts	C225:330n	C220:330n

Fast Part

	Fast HPF 1	Fast HPF 2
pole/zero	5Hz High pass	5Hz High pass
Parts	C275:20u	C276:20u

CARM (ver1)

Common Part

	Common Compensation		Common Boost 1			Common Boost 2			Common Boost 3
pole/zero	40Hz/4kHz		10Hz/1kHz			10Hz/1kHz			300Hz/4.5kHz
Parts	R70:1.2k	C121:33n	R72:15k	R77:165	C118:1000n	R74:15k	R78:165	C119:1000n	R76:4.99k	R79:374	C120:100n

Slow Part

	Slow Boost	Slow Compensation
pole/zero	4Hz/400Hz	4Hz pole
Parts	C225:330n	C220:330n

Fast Part

	Fast HPF 1	Fast HPF 2
pole/zero	5Hz High pass	5Hz High pass
Parts	C275:20u	C276:20u

PLL (ver1)

Common Part

	Common Compensation		Common Boost 1			Common Boost 2			Common Boost 3
pole/zero	40Hz/4kHz		0Hz/10Hz			20Hz/2kHz			20Hz/2kHz
Parts	R70:1.2k	C121:33n	R72:omit	R77:15k	C118:1000n	R74:8.06K	R78:82	C119:1000n	R76:8.06K	R79:82	C120:1000n

Slow Part

	Slow Boost	Slow Compensation	LPF at the last stage
pole/zero	4Hz/400Hz	4Hz pole	100kHz pole --> 500kHz in ver2
Parts	C225:330n	C220:330n	C261: 470p --> 100p in ver2

Fast Part

	Fast HPF 1	Fast HPF 2
pole/zero	5Hz High pass	5Hz High pass
Parts	C275:20u	C276:20u

Gr PDH (ver1)

Common Part

	Common Compensation		Common Boost 1			Common Boost 2			Common Boost 3
pole/zero	40Hz/400Hz		10Hz/1kHz			100Hz/1kHz			300Hz/4.5kHz
Parts	R70:12k	C121:33n	R72:15k	R77:165	C118:1000n	R74:1.5k	R78:165	C119:1000n	R76:4.99k	R79:374	C120:100n

Slow Part

	Slow Boost	Slow Compensation	LPF at the last stage	Slow offset
pole/zero	4Hz/400Hz	4Hz pole	100kHz pole --> 500kHz in ver2	1/10 attenuation
Parts	C225:330n	C220:330n	C261: 470p --> 100p in ver2	R173: 10k --> 91k in ver3

Fast Part

	Fast HPF 1	Fast HPF 2
pole/zero	5Hz High pass	5Hz High pass
Parts	C275:20u	C276:20u

Summing Node (ver1)

Common Part

Common Compensation

Common Boost 1

Common Boost 2

Common Boost 3

pole/zero

40Hz/48kHz

10Hz/1kHz

300Hz/4.5kHz

Parts

R68:120k

R70:100

C121:33n

R72:15k

R77:165

C118:1000n

R74:15k

R78:165

C119:1000n

R76:4.99k

R79:374

C120:100n

Slow Part

	Slow Boost	Slow Compensation
pole/zero	4Hz/400Hz	4Hz pole
Parts	C225:330n	C220:330n

Fast Part

	Fast HPF 1	Fast HPF 2
pole/zero	5Hz High pass	5Hz High pass
Parts	C275:20u	C276:20u

Additional Changes

	Common Excitation
pole/zero	Differential Amp
Parts	R82:10k	R91:10k

Summing Node (ver2)

Common Part