Document

Proposal by
the new members from Toyama university
Fusakazu Matsushima
and
Yukinori Ono
University of Toyama, Japan
KAGRA face to face meeting,,
Kashiwa, Feb. 14, 2013
in this talk
1. Overview
University of Toyama
History with KAGRA
Members of colaboration: 4 groups
2. Inroduction to each group
Laser:
Matsushima et al.
Signal analysis: Hirobayashi et al.
Theory:
Kakizaki
Sapphire Mirror: Ono et al.
University of Toyama
Faculty
------------Science
82 staffs
Engineering
112 staffs
Humanities
Human Development
Economics
Art and Design
Pharmacy
Medicine
many centers
total
903 staffs
1.Overview
ＬｏｃａｔｉｏｎｏｆＴｏｙａｍａ
Toyama
Kamioka
Tokyo
Nagoya
Kamioka – Toyama St.
about 30km
(about 40min. driving on Root 41)
from city border: only few km
Root 41 : called as “Nobel road”
K.Tanaka (chem.)
Osawano
S. Tonegawa (med.)
Kamioka
M. Koshiba (phys.)
Takayama
& more
!
H. Shirakawa (chem.)
Root 41
90km
Toyama
Nagoya
R. Noyori (chem.) O. Shimomura (chem.)
M. Kobayashi (phys.) T. Masukawa (phys.)
History of Toyama university and KAGRA
about 10 years ago
CLIO member (Prof. Ohashi et al) had a lecture.
Students (Nagano, Hayakawa, ..) work in this field.
2012 Jan.
KAGRA member (Prof. Kawamura et al.) had lectures.
2012 July
“Univ. of Toyama and KAGRA Group Joint workshop”.
Campus mailing list “toyama-kagra” starts.
Univ. of Toyama and KAGRA Group Joint workshop
July 7, 2012 in Toyama
Many staffs in the faculties of science and engineering have
much interest in KAGRA project.
2012 Sept.
About 50 students of the
physics department visited
Kamioka.
2012 Oct.
Demonstration of
interferometer in Campus
Festival.
President of Toyama Univ.
visited Kamioka.
2013 fiscal year
Course lecture in the physics dept. by Prof. Kawamura
Four groups are now preparing
1. Laser: 4 members
Fusakazu Matsushima (P), Yoshiki Moriwaki (P)
Kaori Kobayashi (AP), Katsunari Enomoto (AP)
collaborator: M1 students: 2, M2 students: 2
2. Signal analysis: 1 member
Shigeki Hirobayashi (P)
collaborator: M1 student: 1, M2 student: 1
3. Theory: 1 member
Mitsuru Kakizaki (A)
4. Sapphire Mirror: 2 members
Yukinori Ono (P), Tadahiro Hori (A)
(P:professor, AS:associate professor, A: assistant professor)
1: Laser Input/Output system
Matsushima, Moriwaki, Kobayashi, Enomoto
(Microwave Laboratory, Laser Physics Laboratory)
Daily work:
Control of motion of molecules → ultracold molecule
→precise spectroscopy→ fundamental physics→
electric dipole moment of electron
time evolution of fundamental constants
Spectroscopy of interstellar molecules
Collaboration with KAGRA:
2012 Dec.: Discussion with Prof. Terada and Prof. Kawamura
→ 2013 Collaboration title: "R&D for the intensity stabilization
of the laser system in KAGRA"
To obtain more concrete information on I/O system:
→ planning to visit LIGO Hanford in this March
(with the budget by president of Univ. Toyama)
1: Laser Input/Output system
2. Signal Analysis
Gravitational Wave Detection Using
Non-Harmonic Analysis
Organization:
Shigeki Hirobayashi
(University of Toyama)
Collaborators:
Seiji Kawamura (Tokyo)
Hideyuki Tagoshi (Osaka)
Background
• Signal processing
– Audio and speech signals
– Images
– Signals used in medical engineering
• Optical coherence tomography
• Invention
– New frequency analysis method
Non-harmonic analysis (NHA)
Gravitational Wave Detection Using Non-Harmonic Analysis
Advantages of NHA 1
We compared the accuracy of frequency analysis achieved by two approaches.
The accuracy of DFT analysis is
relatively low when the objective
signal is not a multiple of the
fundamental frequency.
The square error of each estimated parameter.
Method
Accuracy
DFT
1 order of
magnitude
NHA
10 or more orders
of magnitude
Better axail resolution can be expected when NHA is used.
Gravitational Wave Detection Using Non-Harmonic Analysis
Advantages of NHA (contd.)
1
2
Original spectrum
Waveform
NHA
DFT
3
NHA
15
Spectral components smaller than the sidelobe can be extracted independently.
15
OCT Image Based on NHA
Fixed mirror
Reference Arm
⊿L1
⊿L2
(a) DFT（FFT）
Probe Arm
High Coherence Source
Sample
Coupler
Δλ
l
c/⊿L
l Scan
t➔f
(b) NHA
FFT
OCT signal
dz
Depth
16 skin
OCT cross-sectional images of onion
Motivation
• Visualization of a gravitational wave
• Separation of gravitational waves from noise
Time-Frequency Distribution
Gravitational Wave Detection Using Non-Harmonic Analysis
3. Theory
M. Kakizaki (Theoretical Physics Laboratory)
Collaborate as a member of Prof. Kanda's Group
2013 thema
"Study for KAGRA data analysis and research for its system"
Ｃｈａｒａｃｔｅｒｉｚａｔｉｏｎｏｆ sａｐｐｈｉｒｅ
ｍｉｒｒｏｒｆｏｒＫＡＧＲＡ
ｕｓｉｎｇｅｌｅｃｔｒｏｎｓｐｉｎｒｅｓｏｎａｎｃｅ
Yukinori Ono
University of Toyama
Core optics of KAGRA
ETMY
f10cm
Laser
MC1
MC3
Mirrors for Main cavities
Initial: Silica
Final: Sapphire
MT1
PRM
PR2
ITMY
ITMX
MT2
BS
PR3
SR2
MC2
f37cm
20
SR3
SRM
ETMX
Mirror for KAGRA
• 温度を下げると物質の性質が変わる。
• 常温（300K）で使用される鏡の材料（合成
石英）が利用できない。
• 光学的に透明な単結晶が望ましい。
Sapphire 2O3)
酸化アルミニウム（Al
Optical property fluctuation
Single crystal with diameter 25㎝,
thickness 10㎝ and Mass 20kg.
21
21
Requirements for
Sapphire
Sapphire
• C-axis mirrors (f25cm x t15cm) .
– Current: f22cm、t15cm
• Absorption Cofficient: < 20 ppm/cm
– Current 50-100 ppm/cm?
22
Sapphire:
Preliminary results
10 Samples from CSI have been measured
Name
Absorption [ppm/cm]
AA149
48
47
AC150
229
138
682
687
P401
34
32
65
67
Purpose of this project
• Clarifying the origin by ESR
ESR: Electron spin resonance
Detecting unpaired spins > 1010
→Sensitive to impurity and defects
in single crystal
24
Electron Spin Resonance
• X-band (Bruker)
• 3 – 300 K Cryostat (Oxford)
Preliminary results
0.10
AC150-A1
P401-A9
信号強度
p-p (a.u.)
0.05
0.00
I
-0.05
Signal A
-0.10
Signal B
-0.15
1000
Signal C
2000
3000
4000
Field (G)
5000
6000
Collaborators
Dr. Masahiro Hori, University of Toyama
Prof. Norikatsu Mio, The university of Tokyo
Prof. Seiji Kawamura, The university of Tokyo
Mr. Nobuhiro Fukumoto，The university of Tokyo

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