KAGRA F2F MEETING
Feb. 2015
Prototype Test of Type-B
Takanori Sekiguchi
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
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Contents
• Overview of SAS prototype test
• Payload prototype test
• Status & plan of full type-B test
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
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Pre-isolator
Prototype Test Status
Assembly
Pre-isolator
GAS filter
Payload
Full System
Performance






Undergoing
TBD
GAS filter
Payload
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
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Payload Prototype Test
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
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Payload Prototype Test in NAOJ
Purpose:
• Check the assemblability
and feasibility
• Test the local control using
OSEMs
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
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Structure of payload
Bottom Filter
Intermediate Mass/
Intermediate Recoil Mass
Mirror / Recoil Mass
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
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(Rough) Assembly Procedure
Suspend mirror & RM
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
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Winches to suspend masses
Height measure to check the
wire length
(Dummy) mirror suspended
by φ0.2 steel wires
Recoil mass suspended by
φ0.6 tungsten wires
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
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(Rough) Assembly Procedure
Suspend IM from BF
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
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Tuning masses
(weight control & balancing)
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
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Screw to change the
suspension point
Tuning pitch frequency
~0.2 Hz
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
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(Rough) Assembly Procedure
Suspend IRM
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
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IRM (without OSEMs)
Suspended by 3 wires
Screws for changing
suspension points
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
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Cabling of electrical wires
Cable clip
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
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Feedback to the design
• Compensation masses to get
enough weight for GAS filter
• Separate OSEM parts for easier
assembly
… and so on.
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
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Control Test
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
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OSEM
Unit of a shadow sensor and a coil-magnet actuator
LED
coil
lens
magnet
flag
(Current Design)
PD
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
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OSEM
Calibration results of shadow sensors of 4 prototype units
Sensitivity: ~6.5 V/mm
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
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OSEM
Shadow sensor noise
~ 5e-10 m/√Hz @ 10 Hz
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
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OSEM
Actuation force by an OSEM actuator
~1.7 [N/A]
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
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Actuator Diagonalization (Mirror)
3 DoFs we want to sense with 4 sensors:
Z
1
4
4 actuators we use to actuate 3 DoFs:
2
X
Y
3
1st guess
The actuation matrix D is improved by measurement.
(Actuator Diagonalization)
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
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Actuator Diagonalization (IM)
6 DoFs we want to sense with 6 sensors:
6
9
Z
10
8
6 actuators we use to actuate 6 DoFs:
Y
X
7
5
1st guess
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
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Implementation in Digital System
MEDM Screen for type-B SAS control (under development)
Sensor Matrix
Signals from
shadow sensors
Actuator Matrix
Actuation
Signals
Signal Flow
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
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Transfer functions (Mirror)
White noise is injected to virtual actuators
Length
Pitch
Yaw
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
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Transfer functions (IM)
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
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Damping Control
Damping servo is applied to
the 6-DoF motion of IM and 3DoF motion of the mirror
Derivative filter
(viscous damping)
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
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In-loop performance
OSEM signal of IM longitudinal motion
3 μm  0.6 μm
OSEM signal of IM yaw motion
30 μrad  2 μrad
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
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Optical Lever
Optical levers to monitor mirror angles / displacement
Collimator
QPD1
Half
Mirror
QPD2
1W SLD
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
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Out of loop performance
Optical lever signals about mirror pitch motion
35 μrad  13 μrad
Optical lever signals about mirror yaw motion
50 μrad  12 μrad
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
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Full Type-B Test
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
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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
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
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Current Status
•
•
Vacuum system preparation
Height of the chamber is to be checked
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
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Current Status
•
•
Cleaning and remanufacturing of IP base
Finished on Jan. 28
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
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Current Status
•
•
Vacuum pod for geophone (seismometer) manufactured
Assembling and cabling should be done
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
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Current Status
•
An assembly frame is designed.
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
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Schedule
•
According to KAGRA schedule, prototype test is to
be finished until the end of March.
•
Extremely tight!
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
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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 KAGRA
Violet: Time-consuming tasks
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
37
We need your help!!
•
We call for KAGRA-shift
• This prototype test is an absolutely
important step
in considering installation procedure of actual system, and
getting more realistic plan/schedule of VIS installation
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
38
Schedule of VIS installation: iKAGRA
iKAGRA schedule
10
Fabry-Perot-Michelson
VIS installation
Stack install
MC suspension install
2014
11
2015
12
1
2
3
4
5
6
7
8
9
10
11
Stack
MC
frame/payload
procurement
PR2 & PR3
IXA & EXA (Xarm
cavity)
IYA & EYA (Yarm
cavity)
modifying
prototype
BS
PR2 & PR3
frame/payload
IXA & EXA
procurement
frame/payload
procurement
payload
BS
procurement
IYA & EYA
Xarm
commissioning
Xarm commissioning
Full
commissioning
Full commissioning
Observation
Michelson
VIS installation
Stack install
MC suspension install
PR2 & PR3
12
Obs.
Stack
MC
frame/payload
procurement
PR2 & PR3
IXA & IYA
EXA & EYA
BS
Michelson
commissioning
Observation
modifying
prototype
frame/payload
procurement
payload
procurement
EXA & EYA
BS
Michelson commissioning
Obs.
39
Dec 2015 operation
END
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
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Appendix
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
41
Close Loop TF
Takanori Sekiguchi
ALPS Report, Dec. 26th, 2013
42