KAGRA2013-0926-Final

Report
Sapphire mirror suspended by sapphire fibers
Key component of KAGRA
(a)Sapphire fiber with nail head :
Quality check is in progress
(support by ELiTES)
(b)Drilled prototype sapphire bulk
will be delivered soon (Shinkosha).
(c)Frame for suspension :
Large parts were delivered.
1
1
KAGRA Baffle system
Example of a large baffle
#3 Narrow-angle baffle
Material: A5052
400 mm radius
Surface: electro-chemical buffed (ECB)
ECB: low scattering
Solblack: Vacuum Compatibility (10-7 Pa),
Cryogenic compatibility (<8K), Low reflectivity
([email protected]), Applicable for a large work
LSC meeting
xxx
Blackened
surface: Solblack
3
Vacuum System
Vacuum chamber on the machining bed
Surface of the vacuum components after
Vacuum chamber on the surface plateECB
5
KAGRA Laser system
Requirements for the laser
• Power > 180 W
• Single frequency
• Linear polarization
• Single transverse mode
• Wide-band control for stabilization systems
• About 1MHz for frequency control
• About 100kHz for intensity control
Schematic view of the laser system
NPRO-> Fiber amplifiers-> Solid state amplifiers
Mitsubishi laser modules
200 W
80 W
Fiber laser amplifiers
40 W
NPRO(500mW)
40 W
Current status
Coherent addition of two laser outputs
Result of the coherent addition
Bright port 78W
Fiber amplifiers
40W x2 (Nufern)
Dark port 4W
41W×2 =>78W Efficiency 95%
Data analysis
Data Analysis Subsystem
(Leader: H.Tagoshi, sub-leaders: Y.Itoh, H.Takahashi)
Current members: 16 people
+ Korean subgroup (Leader: Hyung Won Lee, 3 people)
Current activities:
 Writing the data analysis white paper
 Development of data analysis package for KAGRA
 We have determined the name of data analysis
library for KAGRA.
"KAGALI": KAGRA Algorithmic Library
篝
KAGALI is Japanese word and it means frame for fire using search and discovery.
7
CDS development for KAGRA
First test in CLIO (2009~)
DTT
Reflective memory test
Timing master
(2011~)
Dolphin’s RFM
GE’s RFM
10Gb DAQ router
MEDM
Master PC
Dataviewer
Standalone test
for local control(2010~)
RT front-end 1
RT front-end 2
IO chassis
Real time PC
CentOS 5.2+Wind River
Anti Imaging filters
Anti Alias filters
Server switch
Real Time PC
Gentoo + RT patch
IO chassis
ADC/DAC in IO Chassis
AA/AI filter
Client WS
Large scale setup
for KAGRA(2012~)
Client WSs
Server racks for
RT control
Control ON
Summary
• KAGRA is a unique GW interferometer
with the underground site and the cryogenics
technology.
• The KAGRA construction is in progress.
• Initial operation (iKAGRA) will start in late 2015.
• Cryogenic system for the (bKAGRA) is also in progress.
• Full cryogenic operation will starts in 2017.
• Observation in the global network since 2018
• KAGRA has close collaborations with LIGO/LSC and
EGO/Virgo.
GWADW 2014 in Japan
Date: 2014.5.26-5.30
(reception on 5.25)
Location: Takayama
(~3hrs from Nagoya)
KAGRA site tour will be scheduled.
Conference will be held in the Hida Hotel Plaza.
Takayama
KAGRA
Tokyo
Nagoya
Shirakawago (world heritage)

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