Takanori SekiguchiALPS Report, Dec. 26th, 2013 1
Prototype Test of Type-B
Takanori Sekiguchi
KAGRA F2F MEETINGFeb. 2015
Takanori SekiguchiALPS Report, Dec. 26th, 2013 2
• Overview of SAS prototype test• Payload prototype test• Status & plan of full type-B test
Contents
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Prototype Test Status
Assembly Performance
Pre-isolator
GAS filter
Payload
Full System Undergoing TBD
Pre-isolator
GAS filter
Payload
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Payload Prototype Test
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Payload Prototype Test in NAOJPurpose:• Check the assemblability
and feasibility• Test the local control using
OSEMs
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Structure of payload
Bottom Filter
Intermediate Mass/Intermediate Recoil Mass
Mirror / Recoil Mass
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(Rough) Assembly ProcedureSuspend mirror & RM
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(Dummy) mirror suspended by φ0.2 steel wires
Recoil mass suspended by φ0.6 tungsten wires
Winches to suspend masses
Height measure to check the wire length
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(Rough) Assembly ProcedureSuspend IM from BF
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Tuning masses(weight control & balancing)
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Screw to change the suspension point
Tuning pitch frequency~0.2 Hz
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(Rough) Assembly ProcedureSuspend IRM
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IRM (without OSEMs)Suspended by 3 wires
Screws for changing suspension points
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Cable clip
Cabling of electrical wires
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• Compensation masses to get enough weight for GAS filter
Feedback to the design• Separate OSEM parts for easier
assembly
… and so on.
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Control Test
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OSEMUnit of a shadow sensor and a coil-magnet actuator
(Current Design)
LED
PD
flag
coil
magnetlens
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OSEMCalibration results of shadow sensors of 4 prototype units
Sensitivity: ~6.5 V/mm
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OSEMShadow sensor noise
~ 5e-10 m/√Hz @ 10 Hz
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OSEMActuation force by an OSEM actuator
~1.7 [N/A]
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Actuator Diagonalization (Mirror)
X Y
Z
3 DoFs we want to sense with 4 sensors:
4 actuators we use to actuate 3 DoFs:
The actuation matrix D is improved by measurement.
1st guess
(Actuator Diagonalization)
1
2
3
4
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Actuator Diagonalization (IM)
Z
6 DoFs we want to sense with 6 sensors:
1st guess
X
Y
5
6
78
9 10
6 actuators we use to actuate 6 DoFs:
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Implementation in Digital SystemMEDM Screen for type-B SAS control (under development)
Sensor Matrix Actuator Matrix
Signal Flow
Signals from shadow sensors
ActuationSignals
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Transfer functions (Mirror)
Pitch
Yaw
Length
White noise is injected to virtual actuators
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Transfer functions (IM)
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Damping ControlDamping servo is applied to the 6-DoF motion of IM and 3-DoF motion of the mirror
Derivative filter(viscous damping)
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In-loop performanceOSEM signal of IM longitudinal motion
OSEM signal of IM yaw motion
3 μm 0.6 μm
30 μrad 2 μrad
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Optical LeverOptical levers to monitor mirror angles / displacement
1W SLD
Half Mirror
QPD2
QPD1 Collimator
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Out of loop performanceOptical lever signals about mirror pitch motion
Optical lever signals about mirror yaw motion
35 μrad 13 μrad
50 μrad 12 μrad
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Full Type-B Test
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Full Type-B Test@TAMA West-End Room
• Full type-B prototype will be assembled and tested in vacuum
• Overall performance is to be checked by using optical lever
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Current Status• Vacuum system preparation• Height of the chamber is to be checked
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Current Status• Cleaning and remanufacturing of IP base• Finished on Jan. 28
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Current Status• Vacuum pod for geophone (seismometer) manufactured• Assembling and cabling should be done
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Current Status• An assembly frame is designed.
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Schedule• According to KAGRA schedule, prototype test is to
be finished until the end of March.
• Extremely tight!
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Main Tasks
• Consider assembly procedure.• Do mechanical tuning (leveling, weight control, etc.)• Make an assembly manual (for installation of actual system)• Manufacture in-vacuum electrical cables• Design servo filter in mathematical model• Prepare digital system interface
Red: Important for KAGRAViolet: Time-consuming tasks
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We need your help!!
• We call for KAGRA-shift
• This prototype test is an absolutely important stepin considering installation procedure of actual system, and getting more realistic plan/schedule of VIS installation
39
iKAGRA schedule 2014 2015 10 11 12 1 2 3 4 5 6 7 8 9 10 11 12Fabry-Perot-Michelson
VIS installation
Stack install Stack
MC suspension install MC
PR2 & PR3 frame/payload procurement
PR2 & PR3
IXA & EXA (Xarm cavity)
frame/payload procurement
IXA & EXA
IYA & EYA (Yarm cavity)
frame/payload procurement IYA & EYA
BS modifying prototype
payload procurement
BS
Xarm commissioning
Xarm commissioning
Full commissioning Full commissioning
Observation
Obs.
Michelson
VIS installation
Stack install Stack
MC suspension install MC
PR2 & PR3 frame/payload procurement
PR2 & PR3
IXA & IYA
EXA & EYA frame/payload procurement
EXA & EYA
BS modifying prototype payload
procurementBS
Michelson commissioning
Michelson commissioning
Observation Obs.
Schedule of VIS installation: iKAGRA
Dec 2015 operation
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END
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Appendix
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Close Loop TF
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