Displaying reports 62661-62680 of 82999.Go to page Start 3130 3131 3132 3133 3134 3135 3136 3137 3138 End
Reports until 18:07, Tuesday 25 August 2015
H1 CDS (DAQ)
david.barker@LIGO.ORG - posted 18:07, Tuesday 25 August 2015 (20886)
DAQ Broadcaster reconfiguration

The H1BROADCAST0.ini file was modified this morning to:

fix a typo in one channel

remove obsolete channels which no longer exist in the H1 system.

full list is here.

here is the list of removed channels

H1 TCS
nutsinee.kijbunchoo@LIGO.ORG - posted 17:37, Tuesday 25 August 2015 (20885)
Cleaned both TCSX and TCSY chiller filters
H1 CDS (DAQ)
david.barker@LIGO.ORG - posted 16:23, Tuesday 25 August 2015 (20880)
CDS model and DAQ restart report, Monday 24th August 2015

ER8 Day 8. No restarts reported

H1 CDS (DAQ)
david.barker@LIGO.ORG - posted 16:21, Tuesday 25 August 2015 (20879)
CDS model and DAQ restart report, Sunday 23rd August 2015

ER8 Day 7. No restarts reported.

H1 CDS
patrick.thomas@LIGO.ORG - posted 16:21, Tuesday 25 August 2015 - last comment - 18:16, Tuesday 25 August 2015(20878)
updated Conlog channel list
Added 19 channels. Removed 16 channels.

The following channels remain unmonitored:

H1:GRD-SYS_DIAG_LOGLEVEL
H1:GRD-SYS_DIAG_MODE
H1:GRD-SYS_DIAG_NOMINAL_S
H1:GRD-SYS_DIAG_REQUEST
H1:GRD-SYS_DIAG_REQUEST_S
H1:GRD-SYS_DIAG_STATE_S
H1:GRD-SYS_DIAG_STATUS
H1:GRD-SYS_DIAG_TARGET_S
Comments related to this report
jameson.rollins@LIGO.ORG - 16:39, Tuesday 25 August 2015 (20883)

The SYS_DIAG node was removed this morning, so those channels will never exist.

There is now a DIAG_MAIN node, so new channels: H1:GRD-DIAG_MAIN...

patrick.thomas@LIGO.ORG - 18:16, Tuesday 25 August 2015 (20887)
Dave updated the guardian autoBurt files and I rescanned the channel list.

+ H1:GRD-DIAG_MAIN_LOGLEVEL
+ H1:GRD-DIAG_MAIN_MODE
+ H1:GRD-DIAG_MAIN_NOMINAL_S
+ H1:GRD-DIAG_MAIN_REQUEST
+ H1:GRD-DIAG_MAIN_REQUEST_S
+ H1:GRD-DIAG_MAIN_STATE_S
+ H1:GRD-DIAG_MAIN_STATUS
+ H1:GRD-DIAG_MAIN_TARGET_S
+ H1:GRD-SR3_CAGE_SERVO_LOGLEVEL
+ H1:GRD-SR3_CAGE_SERVO_MODE
+ H1:GRD-SR3_CAGE_SERVO_NOMINAL_S
+ H1:GRD-SR3_CAGE_SERVO_REQUEST
+ H1:GRD-SR3_CAGE_SERVO_REQUEST_S
+ H1:GRD-SR3_CAGE_SERVO_STATE_S
+ H1:GRD-SR3_CAGE_SERVO_STATUS
+ H1:GRD-SR3_CAGE_SERVO_TARGET_S
- H1:GRD-SYS_DIAG_LOGLEVEL
- H1:GRD-SYS_DIAG_MODE
- H1:GRD-SYS_DIAG_NOMINAL_S
- H1:GRD-SYS_DIAG_REQUEST
- H1:GRD-SYS_DIAG_REQUEST_S
- H1:GRD-SYS_DIAG_STATE_S
- H1:GRD-SYS_DIAG_STATUS
- H1:GRD-SYS_DIAG_TARGET_S
inserted 16 pv names
deleted 8 pv names
H1 CDS
patrick.thomas@LIGO.ORG - posted 16:16, Tuesday 25 August 2015 - last comment - 16:26, Tuesday 25 August 2015(20877)
ISC_LOCK guardian all states medm not opening
Kiwamu, Patrick

Neither of us can get the medm screen for all the ISC_LOCK guardian states to open.
Comments related to this report
jameson.rollins@LIGO.ORG - 16:26, Tuesday 25 August 2015 (20881)

That almost always means there's a syntax error with the ISC_LOCK guardian node:

jameson.rollins@operator1:/opt/rtcds/userapps/release 130$ guardutil print ISC_LOCK
ifo: H1
name: ISC_LOCK
Traceback (most recent call last):
  File "/ligo/apps/linux-x86_64/guardian-1485/bin/guardutil", line 396, in <module>
    args.func(args)
  File "/ligo/apps/linux-x86_64/guardian-1485/bin/guardutil", line 34, in sprint
    cli.print_system(system)
  File "/ligo/apps/linux-x86_64/guardian-1485/lib/python2.7/site-packages/guardian/cli.py", line 90, in print_system
    system.load()
  File "/ligo/apps/linux-x86_64/guardian-1485/lib/python2.7/site-packages/guardian/system.py", line 403, in load
    module = self._load_module()
  File "/ligo/apps/linux-x86_64/guardian-1485/lib/python2.7/site-packages/guardian/system.py", line 291, in _load_module
    self._module = self._import(self._modname)
  File "/ligo/apps/linux-x86_64/guardian-1485/lib/python2.7/site-packages/guardian/system.py", line 165, in _import
    module = _builtin__import__(name, globals, locals, fromlist, level)
  File "/opt/rtcds/userapps/release/isc/h1/guardian/ISC_LOCK.py", line 1339
    @nodes.checker().switch('SUS-PR2_M1_LOCK_P', 'INPUT', 'ON')
                    ^
SyntaxError: invalid syntax
jameson.rollins@operator1:/opt/rtcds/userapps/release 1$ 

H1 General
jeffrey.bartlett@LIGO.ORG - posted 16:00, Tuesday 25 August 2015 (20875)
Ops Day Shift Summary

LVEA: Laser Hazard

IFO: UnLocked

Observation Bit: Commissioning 

 

All Times in UTC

15:00 Take over from Ed

15:00 IFO Unlocked for maintenance

15:00 Hugh – Going to HAM2 to install STS A seismometer

15:00 Praxair N2 delivery to CP1

15:12 Christina & Karen – Cleaning in the LVEA

15:17 Gerardo & Kyle – Moving vacuum equipment between end stations

15:20 HFD – On site to work on alarms

15:22 Keita – Going to End-X to power cycle QPD

15:24 Joe – Escorting Sprague in LVEA

15:30 Jodi – Going to Y arm, X arm, & LVEA tagging vacuum equipment

15:33 Filiberto – Going to End-X to look into UIM problem

15:47 Joe & Sprague – Out of LVEA – Going to End-X and End-Y

15:50 Carlos – Going to End-X and End-Y to work on phones

15:54 Elli – Going to Hartman table at HAM4

15:56 Richard – Going into CER to work on PRM problem

16:01 Sudarshan – Going into LVEA to check on various PEM equipment

16:12 Nutsinee – TCS Temp Sensor swap

16:16 Elli – Out of LVEA

16:25 Filiberto – Finished at End-X

16:54 Joe & Sprague – Back from End Stations

16:55 Joe & Sprague – Going to the carpenter shop

16:59 Christina & Karen – Cleaning at End-X

17:00 Joe & Sprague – Back from carpenter shop

17:03 Sprague – Checking traps on the X-Arm  

17:05 Jodi – Finished at End Stations, going into the LVEA

17:19 Christina & Karen – Finished at End-X – Going to End-Y

17:29 Kiwamu – Going to PSL rack to measure ALS-Diff stuff

17:44 Keita – Finished at End-X

18:03 Keita – Starting model restarts

18:03 Christina & Karen Finished at End-Y

18:08 Sheila – Taking down the mode cleaner

18:24 Travis – Going into LVEA to get cables

18:26 Dave – Doing DAQ restart

18:29 Elli – Going into the LVEA to assist Nutsinee

18:32 Travis – Out of LVEA

18:38 Filiberto & Andres – Terminating cables near the PSL rack

18:41 Carlos – Back from the End Stations

18:42 Dave – Going into CER and both end stations to update drawings

18:55 Elli – Out of the LVEA

18:58 Nutsinee – Out of the LVEA

19:00 Kyle & Gerardo – Driving truck & trailer from End-Y past CS going to End-X

19:03 Jeff K. – Going into LVEA to check on cable work near PSL rack

19:05 Sprague – Back from both arms

19:10 Jeff K. – Out of LVEA

19:10 Filiberto & Andres – Out of LVEA – in CER terminating cables

19:20 Add 250ml water to PSL crystal chiller

19:35 Kyle & Gerardo – Finished moving vacuum equipment

20:22 HFD – Maintenance work at Mid-Y and End-Y

20:41 Joe & Chris – Removing birds nest from ladder

20:50 Richard – Going to the roof

21:06 Richard – Off the roof

21:12 Richard – Going into MSR

21:14 Joe & Chris – Back from Mid-X

22:16 IFO locked at NOMINAL_LOW_NOISE

 

Shift Summary & Observations:

   Start maintenance at 15:00. Working through the task list.

   No apparent issues with maintenance tasks

   Finished maintenance around 18:00, Leo and Kiwamu taking measurements until around 19:50

 

   Started to lock the IFO at 19:55. Green locking OK. The alignment on AS-Air did not look so good. Run an initial alignment and start locking the IFO.  Had to dress up the power by tweaking PRM (mostly in yaw). Commissioners were making fine adjustments, and the IFO locked at NOMINAL_LOW_NOISE with a 50Mpc range. After the initial alignment and a few adjustments by the commissioners, the IFO locked without much difficulty.   

 

   NOTE: The PSL crystal chiller was alarming with a low water level. Add 250ml of water to top off reservoir. According to the log on the chiller, water was last added on 08/05/15. The PSL chiller water levels need to be checked once per week.   

 

   Commissioners are working on calibration.  

H1 SUS (SUS, SYS)
leonid.prokhorov@LIGO.ORG - posted 15:21, Tuesday 25 August 2015 (20874)
OPLEV charge measurements
Charge measurements was done on both ETMs.
It seems like ETMY change the sign of charging after changing the bias sign on ETMY (see 20387) while ETMX charging is the same (as well as the bias sign).
Now (since Aug,10) both ETMX and ETMY Biases are -9.5V, 
Plots are in attachment.
Images attached to this report
H1 SYS
hugh.radkins@LIGO.ORG - posted 13:51, Tuesday 25 August 2015 - last comment - 14:46, Tuesday 25 August 2015(20870)
ODC Master model Updated per E1500352

w/conversations and email from Duncan,

Svn Up'd:  userapps/release/sys/common/models/ODC_MASTER_PARTS_V2.mdl

Svn Added:  userapps/release/sys/common/src/RIP_OBS_READY_FROM_MASTER.c

Modified: userapps/release/sys/h1/models/h1odcmaster.mdl from DCC E1500352 tarball.

recompiled, installed, started.

This presented two new channels:  H1:ODC-AUTO_UNSET_OBS_INTENT & H1:ODC-OBS_READY_BIT_NUMBER

These were set to be monitored in SDF and set their values to 1 & 2 respectively.  This means 1==> yes automatically unset the observation intent bit based on the value of bit number 2 in ODC MASTER.

The modified safe.snap has been commited to the svn.

Comments related to this report
jameson.rollins@LIGO.ORG - 14:13, Tuesday 25 August 2015 (20871)

I have updated and reloaded the guardian IFO top node such that it no longer unsets the 'ODC-OPERATOR_OBSERVATION_READY' (aka INTENT) bit after dropping from OK.  This logic is now handled in the ODC MASTER.

Please see LLO alog 19981 for information about how this affects operations.  Probably the most salient aspect of the change:

The INTENT (ODC-OPERATOR_OBSERVATION_READY) bit will not be allowed to be set by the operator unless the READY bit is True.

The READY bit is composed of two parts:

  • guardian IFO top node OK
  • No EXC channels active (as determined by ODC master)

If the INTENT bit can not be set, look at the state of both of these things to determine if there is an issue.

jameson.rollins@LIGO.ORG - 14:46, Tuesday 25 August 2015 (20872)

I also just removed the unsetting of ODC-OPERATOR_OBSERVATION_READY from ISC_LOCK (it shouldn't have been there in the first place).  ISC_LOCK was reloaded, so this change should have taken affect.

H1 TCS
nutsinee.kijbunchoo@LIGO.ORG - posted 13:44, Tuesday 25 August 2015 (20869)
TCS CO2X temp sensor installation

Elli, Nutsinee

The clamp turned out to be a little big so the sensor couldn't be firmly held to the mount but it is in place and won't go anywhere. The configuration is the same as how we installed it at the CO2Y.

H1 PEM
filiberto.clara@LIGO.ORG - posted 13:32, Tuesday 25 August 2015 (20868)
H1 PEM LVEA
Terminated bnc cables for the PEM-CS_RADIO_LVEA antenna. Cables are along west wall of HAM2.
Installed an 18 Bit DAC AI Chassis D1101785 in OAF-C1 rack, slot U22&U21. SN S1201691
Installed an Quad I&Q RF Demodulator D0902796 in OAF-C1 rack, slot U27. SN S1000981
Pulled 2 LMR cables from the OAF-C1 rack to ISC-C4 rack for the demodulator LO signals of 9MHz and 45MHz. The LO signals are connected to the follwing RF Distribution Amplifier units in ISC-C4:
9MHz U26 Port 4
45MHz U19 Port 4

H1 SUS
filiberto.clara@LIGO.ORG - posted 13:07, Tuesday 25 August 2015 (20867)
ETMX UIM Chassis
Replaced breaker on UIM chassis (S0900303) from a 1A to 3A. Nominal current draw with no load is ~0.5 amps. Will monitor to see if this resolves issue. 
H1 SYS
hugh.radkins@LIGO.ORG - posted 12:57, Tuesday 25 August 2015 (20866)
Maintenance Day Time Line

All times local PDT.

0728  IFO Dropped Lock

0755 Richard Starts on PRM -- Finished 1044 -- No obvious problem but Chassis changed.

0759 Hugh Installs STS2-A at HAM2 -- Finished 0825

0822 Keita to EndX for QPD checks-- Finished 1043--No obvious problem.

0833 Phil to EndX for UIM -- Upgraded breaker from 1 to 3Amps.  Done 0935

0835 Hugh updates ODC MASTER for Auto Intent_Bit Reset  ECR E1500352

0855 Ellie to TCS HWS Camera Power Supply, removes filter to EE Shop.  No good, revert to no-filter configuration.  Done 1033

0912 Nutsinee to TCSX for Temperature Sensor install--Finished 1158.

0930 Barker completes LSC/ASC/OAF/PEMEX  Model updates for SciFrame changes & others (see Kawabi=LSC)

1031 Kiwamu doing ALS Diff Electronic Measurements.  Done 1245

1000 SysDiag Guardian node down for rebuild finished 1723

1100 Leo starts ETM Charge Measurements.  Complete 1239.

1105 Model Restarts--H1OAF fails from Epics problem.  Halt model restarts.

1115 JimB fixes Epics problem.  Model Restarts resume.

1124 DAQ Restart

1130 Daniel & Sheila at AS WFS Electronic response  & dark noise  Done 1240.

~1100 Phil Terminating PEM Cables in LVEA and CER.  Installing 18bit DAC card.  Done 1244.

H1 SUS (ISC, SUS, SYS)
richard.mccarthy@LIGO.ORG - posted 12:38, Tuesday 25 August 2015 - last comment - 09:09, Wednesday 26 August 2015(20865)
PRM M3 LL coil investigation
Following up on Evan's investigation into the glitches from LL coil on the PRM M3.   I tried to monitor the output with a scope attached.  I was not looking for very big signals as the the noisemon indicated roughly 30mV signal and it has some gain associated with it. So I connected to scope probes to the LL coil drive signal and looked at it on a scope with a trigger set fairly low.(10s of milivolts).  I also looked at UL just for comparison.   I was able to get the signal to trigger on some events  on LL that were not seen at as high a level on UL.  This was with the DAC both connected and disconnected with small offset (20 counts) applied and a large offset (20,000 counts) applied.  After a couple of hours of investigation I decided there were some glitches present and seemed to be from the coil driver not the DAC.  I also looked at the DAC input to the coil driver and did not see the glitches.  In the end I swapped out the coil driver.  I am not 100% certain this will fix the problem as it was difficult to verify the glitches were present at all times.

Comments related to this report
filiberto.clara@LIGO.ORG - 09:09, Wednesday 26 August 2015 (20914)
Unit removed S1100045.
Unit installed S1100025.
H1 ISC
keita.kawabe@LIGO.ORG - posted 11:49, Tuesday 25 August 2015 (20864)
LSC and ASC science frame channels update

WP5452: New LSC and ASC models were made and built yesterday, and were installed today. ASC update also include one bug fix for ASC ODC (change one data type from cdsepicsout to cdsepicslong).

As for LSC, as per E1500343, 45MHz AM monitor channels was added to the science frame at 16kHz.

As for ASC, as per E1500348, input side of ASC feedback filters were added to ASC at 256Hz, and as per E1500349, ALS-C_TRX_A_LF_OUT_DQ and ALS-C_TRY_A_LF_OUT_DQ (both 2k) were removed.

After the installation, in chans/daq directory, LSC and ASC science frame channels were checked.

$ grep -B 1 "^acquire=3" H1LSC.ini|grep DQ

[H1:IMC-F_OUT_DQ]
[H1:IMC-I_OUT_DQ]
[H1:IMC-L_OUT_DQ]
[H1:IMC-REFL_DC_OUT_DQ]
[H1:IMC-TRANS_OUT_DQ]
[H1:LSC-ASAIR_B_RF90_I_ERR_DQ]
[H1:LSC-MCL_IN1_DQ]
[H1:LSC-MCL_OUT_DQ]
[H1:LSC-MICH_IN1_DQ]
[H1:LSC-MICH_OUT_DQ]
[H1:LSC-MOD_RF45_AM_AC_OUT_DQ]
[H1:LSC-ODC_CHANNEL_OUT_DQ]
[H1:LSC-POPAIR_B_RF18_I_ERR_DQ]
[H1:LSC-POPAIR_B_RF90_I_ERR_DQ]
[H1:LSC-POP_A_LF_OUT_DQ]
[H1:LSC-POP_A_RF45_I_ERR_DQ]
[H1:LSC-POP_A_RF45_Q_ERR_DQ]
[H1:LSC-POP_A_RF9_I_ERR_DQ]
[H1:LSC-POP_A_RF9_Q_ERR_DQ]
[H1:LSC-PRCL_IN1_DQ]
[H1:LSC-PRCL_OUT_DQ]
[H1:LSC-REFL_A_LF_OUT_DQ]
[H1:LSC-REFL_A_RF45_I_ERR_DQ]
[H1:LSC-REFL_A_RF45_Q_ERR_DQ]
[H1:LSC-REFL_A_RF9_I_ERR_DQ]
[H1:LSC-REFL_A_RF9_Q_ERR_DQ]
[H1:LSC-REFL_SERVO_ERR_OUT_DQ]
[H1:LSC-REFL_SERVO_SLOW_OUT_DQ]
[H1:LSC-SRCL_IN1_DQ]
[H1:LSC-SRCL_OUT_DQ]

 

$ grep -B 1 "^acquire=3" H1ASC.ini|grep DQ

[H1:ASC-AS_A_DC_PIT_OUT_DQ]
[H1:ASC-AS_A_DC_SUM_OUT_DQ]
[H1:ASC-AS_A_DC_YAW_OUT_DQ]
[H1:ASC-AS_A_RF36_I_PIT_OUT_DQ]
[H1:ASC-AS_A_RF36_I_YAW_OUT_DQ]
[H1:ASC-AS_A_RF36_Q_PIT_OUT_DQ]
[H1:ASC-AS_A_RF36_Q_YAW_OUT_DQ]
[H1:ASC-AS_A_RF45_I_PIT_OUT_DQ]
[H1:ASC-AS_A_RF45_I_YAW_OUT_DQ]
[H1:ASC-AS_A_RF45_Q_PIT_OUT_DQ]
[H1:ASC-AS_A_RF45_Q_YAW_OUT_DQ]
[H1:ASC-AS_B_DC_PIT_OUT_DQ]
[H1:ASC-AS_B_DC_SUM_OUT_DQ]
[H1:ASC-AS_B_DC_YAW_OUT_DQ]
[H1:ASC-AS_B_RF36_I_PIT_OUT_DQ]
[H1:ASC-AS_B_RF36_I_YAW_OUT_DQ]
[H1:ASC-AS_B_RF36_Q_PIT_OUT_DQ]
[H1:ASC-AS_B_RF36_Q_YAW_OUT_DQ]
[H1:ASC-AS_B_RF45_I_PIT_OUT_DQ]
[H1:ASC-AS_B_RF45_I_YAW_OUT_DQ]
[H1:ASC-AS_B_RF45_Q_PIT_OUT_DQ]
[H1:ASC-AS_B_RF45_Q_YAW_OUT_DQ]
[H1:ASC-AS_C_PIT_OUT_DQ]
[H1:ASC-AS_C_SUM_OUT_DQ]
[H1:ASC-AS_C_YAW_OUT_DQ]
[H1:ASC-CHARD_P_IN1_DQ]
[H1:ASC-CHARD_P_OUT_DQ]
[H1:ASC-CHARD_Y_IN1_DQ]
[H1:ASC-CHARD_Y_OUT_DQ]
[H1:ASC-CSOFT_P_IN1_DQ]
[H1:ASC-CSOFT_P_OUT_DQ]
[H1:ASC-CSOFT_Y_IN1_DQ]
[H1:ASC-CSOFT_Y_OUT_DQ]
[H1:ASC-DC1_P_IN1_DQ]
[H1:ASC-DC1_P_OUT_DQ]
[H1:ASC-DC1_Y_IN1_DQ]
[H1:ASC-DC1_Y_OUT_DQ]
[H1:ASC-DC2_P_IN1_DQ]
[H1:ASC-DC2_P_OUT_DQ]
[H1:ASC-DC2_Y_IN1_DQ]
[H1:ASC-DC2_Y_OUT_DQ]
[H1:ASC-DC3_P_IN1_DQ]
[H1:ASC-DC3_P_OUT_DQ]
[H1:ASC-DC3_Y_IN1_DQ]
[H1:ASC-DC3_Y_OUT_DQ]
[H1:ASC-DC4_P_IN1_DQ]
[H1:ASC-DC4_P_OUT_DQ]
[H1:ASC-DC4_Y_IN1_DQ]
[H1:ASC-DC4_Y_OUT_DQ]
[H1:ASC-DC5_P_IN1_DQ]
[H1:ASC-DC5_P_OUT_DQ]
[H1:ASC-DC5_Y_IN1_DQ]
[H1:ASC-DC5_Y_OUT_DQ]
[H1:ASC-DHARD_P_IN1_DQ]
[H1:ASC-DHARD_P_OUT_DQ]
[H1:ASC-DHARD_Y_IN1_DQ]
[H1:ASC-DHARD_Y_OUT_DQ]
[H1:ASC-DSOFT_P_IN1_DQ]
[H1:ASC-DSOFT_P_OUT_DQ]
[H1:ASC-DSOFT_Y_IN1_DQ]
[H1:ASC-DSOFT_Y_OUT_DQ]
[H1:ASC-INP1_P_IN1_DQ]
[H1:ASC-INP1_P_OUT_DQ]
[H1:ASC-INP1_Y_IN1_DQ]
[H1:ASC-INP1_Y_OUT_DQ]
[H1:ASC-INP2_P_IN1_DQ]
[H1:ASC-INP2_P_OUT_DQ]
[H1:ASC-INP2_Y_IN1_DQ]
[H1:ASC-INP2_Y_OUT_DQ]
[H1:ASC-MICH_P_IN1_DQ]
[H1:ASC-MICH_P_OUT_DQ]
[H1:ASC-MICH_Y_IN1_DQ]
[H1:ASC-MICH_Y_OUT_DQ]
[H1:ASC-ODC_CHANNEL_OUT_DQ]
[H1:ASC-OMC_A_PIT_OUT_DQ]
[H1:ASC-OMC_A_SUM_OUT_DQ]
[H1:ASC-OMC_A_YAW_OUT_DQ]
[H1:ASC-OMC_B_PIT_OUT_DQ]
[H1:ASC-OMC_B_SUM_OUT_DQ]
[H1:ASC-OMC_B_YAW_OUT_DQ]
[H1:ASC-POP_A_PIT_OUT_DQ]
[H1:ASC-POP_A_SUM_OUT_DQ]
[H1:ASC-POP_A_YAW_OUT_DQ]
[H1:ASC-POP_B_PIT_OUT_DQ]
[H1:ASC-POP_B_SUM_OUT_DQ]
[H1:ASC-POP_B_YAW_OUT_DQ]
[H1:ASC-POP_X_RF_I_PIT_OUT_DQ]
[H1:ASC-POP_X_RF_I_YAW_OUT_DQ]
[H1:ASC-POP_X_RF_Q_PIT_OUT_DQ]
[H1:ASC-POP_X_RF_Q_YAW_OUT_DQ]
[H1:ASC-PRC1_P_IN1_DQ]
[H1:ASC-PRC1_P_OUT_DQ]
[H1:ASC-PRC1_Y_IN1_DQ]
[H1:ASC-PRC1_Y_OUT_DQ]
[H1:ASC-PRC2_P_IN1_DQ]
[H1:ASC-PRC2_P_OUT_DQ]
[H1:ASC-PRC2_Y_IN1_DQ]
[H1:ASC-PRC2_Y_OUT_DQ]
[H1:ASC-REFL_A_DC_PIT_OUT_DQ]
[H1:ASC-REFL_A_DC_SUM_OUT_DQ]
[H1:ASC-REFL_A_DC_YAW_OUT_DQ]
[H1:ASC-REFL_A_RF45_I_PIT_OUT_DQ]
[H1:ASC-REFL_A_RF45_I_YAW_OUT_DQ]
[H1:ASC-REFL_A_RF45_Q_PIT_OUT_DQ]
[H1:ASC-REFL_A_RF45_Q_YAW_OUT_DQ]
[H1:ASC-REFL_A_RF9_I_PIT_OUT_DQ]
[H1:ASC-REFL_A_RF9_I_YAW_OUT_DQ]
[H1:ASC-REFL_A_RF9_Q_PIT_OUT_DQ]
[H1:ASC-REFL_A_RF9_Q_YAW_OUT_DQ]
[H1:ASC-REFL_B_DC_PIT_OUT_DQ]
[H1:ASC-REFL_B_DC_SUM_OUT_DQ]
[H1:ASC-REFL_B_DC_YAW_OUT_DQ]
[H1:ASC-REFL_B_RF45_I_PIT_OUT_DQ]
[H1:ASC-REFL_B_RF45_I_YAW_OUT_DQ]
[H1:ASC-REFL_B_RF45_Q_PIT_OUT_DQ]
[H1:ASC-REFL_B_RF45_Q_YAW_OUT_DQ]
[H1:ASC-REFL_B_RF9_I_PIT_OUT_DQ]
[H1:ASC-REFL_B_RF9_I_YAW_OUT_DQ]
[H1:ASC-REFL_B_RF9_Q_PIT_OUT_DQ]
[H1:ASC-REFL_B_RF9_Q_YAW_OUT_DQ]
[H1:ASC-SRC1_P_IN1_DQ]
[H1:ASC-SRC1_P_OUT_DQ]
[H1:ASC-SRC1_Y_IN1_DQ]
[H1:ASC-SRC1_Y_OUT_DQ]
[H1:ASC-SRC2_P_IN1_DQ]
[H1:ASC-SRC2_P_OUT_DQ]
[H1:ASC-SRC2_Y_IN1_DQ]
[H1:ASC-SRC2_Y_OUT_DQ]
 

H1 CAL
kiwamu.izumi@LIGO.ORG - posted 01:15, Tuesday 25 August 2015 - last comment - 18:08, Tuesday 25 August 2015(20851)
OMC DCPD calibration in single bounce configuration

This is just a quick report about one of today's calibration activities.

I made a measurement to help understanding the OMC DCPD response by having intensity modulated light on OMC in a simple configuration. At the beginning I was going to use ISS PD arrays to calibration the intensity noise, but it turned out that they were not accurate enough to get 1 % accuracy due to mismatched dewhitening filters in the digital system. Seeking for alternatives, I finally ended up with ASC AS_C. Data and analysis to come later.

Comments related to this report
kiwamu.izumi@LIGO.ORG - 18:08, Tuesday 25 August 2015 (20876)

The frequency response of OMC DCPDs (A and B) are checked using ASC-AS_C as a intensity noise monitor in the single bounce configuration. Even though the response of ASC-AS_C is not well known, the result shows an almost flat response as expected with a deviation of 6% at most which is encouraging.

In order to improve the accuracy of the measurement, we should prepare a well-calibrated photo detector, probably placed at ISCT6, and make the same comparison measurement with the OMC DCPDs.

 

Method:

The interferomter was in a single-bounce configuration where the beam bounces off of ITMX and goes to the AS port without any recycling. Also ETMs are misaligned as well in order to avoid flash from the arm cavities. The PSL power was intentionally set to the maximum in order to get the maximum signal to noise ratio everywhere. The OMC is locked to the carrier 00 mode with a OMC-LSC_GAIN of 20. I forgot the UGF of the OMC length loop, but it was on the order of 100 Hz, I believe. The OMC alignment was done by the QPD loops with a overall gain of 0.1. For some reason, I needed to engage DC centering loops for the AS WFS A and B, otherwise it would saturate the OMC suspension. The photo current on each OMC DCPD was about 17 mA, which is a bit too high compared with the nominal full lock photo current of 10 mA.

I injected swept sine signal to the ISS inner loop from 7 kHz to 10 Hz. Then I measured a relative response between ASC-AS_C segment 3 and two OMC DCPDs. One trick in doing this is that I had to use an IOP signal to measure the response of ASC-AS_C because the ASC front end runs at only 2 kHz. Also, since I used the IOP signal, I was not able to grab summed QPD signals, and that's why I ended up with one of the QPD segments. Segment 3 happened to receive the highest power and therefore I chose this for the final analysis.

The dtt file and its ascii formated data are checked into the SVN at

/CalSVN/aligocalibration/trunk/Runs/ER8/H1/Measurements/OMCDCPDs/2015-08-24_omc_dcpd_and_asc_pd.xml

/CalSVN/aligocalibration/trunk/Runs/ER8/H1/Measurements/OMCDCPDs/2015-08-24_asc_to_omc_dcpds_tfs.txt

/CalSVN/aligocalibration/trunk/Runs/ER8/H1/Measurements/OMCDCPDs/2015-08-24_asc_to_omc_dcpds_coh.txt

Also the analysis code can be found in SVN at

CalSVN/aligocalibration/trunk/Runs/ER8/H1/Scripts/OMCDCPDs/analyze_asc_to_omc_dcpds.m

 

Results:

The result is shown in the attached pdf. It is relative gain (or transfer function) between OMC DCPDs and ASC-AS_C. The red dots are for DCPD A and blue for DCPD B. The following frequency responses are taken into account:

  • OMC DCPD pre-amp high freq poles (13.7 kHz and 17.8 kHz) (alog 18008
  • OMC DCPD pre-amp audio freq zpk (alog 17647) which are compensated in the OMC front end model.
  • IOP down sampling filter (64 kHz -> 16 kHz)

Note that since AS_C is acquired at 64 kHz without any downsampling, I did not apply any digital low pass for it. Aside from these known parameters, I had to make some assumptions as follows.

  • Analog antialiasing filters are the same between all the PDs and therefore they cancel when taking a ratio of any two PDs.
  • ASC-AS_C has a built in whitening with zpk([0.39], [39.8; 79.6e3] ) according to D1001974.
  • The response of ASC-AS_C is flat in frequency.

Obviously, the key points to success this method is to reduce the number of the assumptions, but this time I simply attempted with ASC-AS_C, which I had to make multiple assumptions, to get some idea of how the measurement would go.

As shown in the upper panel, the absolute magnitude is almost flat with a trend in which the DCPD response higher at high frequencies. The error bars are placed by using the usual coherence technique (see alog 10506). The low frequency part below 20 Hz is clearly limited by low coherence, but it seems to consistently show lower response at low frequencies. If we take a peak to peak of the variation, it is going to be roughly 1.04 / 0.94 ~ 10 %. Looking at the phase, shown in the lower panel, the phase seems to diverge as it goes to high frequencies such as AS_C response. I don't think it can be explained by mismatch in the analog anti-aliasing filters because they are usually well matched. At this point, we can not really say if the high frequency deviation is from the real DCPD response of some artifact from unidentified uncompensated AS_C response.

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