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Proposal by the new members from Toyama university
Fusakazu Matsushimaand
Yukinori Ono
University of Toyama, Japan
KAGRA face to face meeting,,Kashiwa, Feb. 14, 2013
in this talk
1. OverviewUniversity of ToyamaHistory with KAGRAMembers of colaboration: 4 groups
2. Inroduction to each group Laser: Matsushima et al.
Signal analysis: Hirobayashi et al.Theory: KakizakiSapphire 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 Location of Toyama
Kamioka
Toyama
Tokyo
NagoyaKamioka – Toyama St. about 30km (about 40min. driving on Root 41)from city border: only few km
Root 41 : called as “Nobel road”Toyama
Osawano
Kamioka
Takayama
Nagoya
90kmR
oo
t 41
K.Tanaka (chem.)
S. Tonegawa (med.)
M. Koshiba (phys.)
H. Shirakawa (chem.)
R. Noyori (chem.) O. Shimomura (chem.)M. Kobayashi (phys.) T. Masukawa (phys.)
& more !
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 memberShigeki Hirobayashi (P)collaborator: M1 student: 1, M2 student: 1
3. Theory: 1 member Mitsuru Kakizaki (A)
4. Sapphire Mirror: 2 membersYukinori Ono (P), Tadahiro Hori (A)
(P:professor, AS:associate professor, A: assistant professor)
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 electrontime 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
1: Laser Input/Output system
Organization:Shigeki Hirobayashi
(University of Toyama)
Collaborators:Seiji Kawamura (Tokyo)
Hideyuki Tagoshi (Osaka)
Gravitational Wave Detection Using Non-Harmonic Analysis
2. Signal Analysis
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.
Method Accuracy
DFT 1 order of magnitude
NHA 10 or more orders of magnitude
The square error of each estimated parameter.
Better axail resolution can be expected when NHA is used.
The accuracy of DFT analysis is relatively low when the objective signal is not a multiple of the fundamental frequency.
Gravitational Wave Detection Using Non-Harmonic Analysis
151515
Advantages of NHA (contd.)
3NHA
DFT
Spectral components smaller than the sidelobe can be extracted independently.
2 Waveform
1 Original spectrum
NHA
High Coherence Source Probe Arm
c/⊿L
t ➔ f
FFTOCT signal
z
Δλ
⊿L1 ⊿L2
Scan
Depth
Reference Arm
Fixed mirror
Coupler
Sample
16
OCT Image Based on NHA
(a) DFT( FFT)
(b) NHAOCT cross-sectional images of onion skin.
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"
Characterization of sapphire mirror for KAGRAusing electron spin resonance
Yukinori Ono
University of Toyama
Laser MC1
MC2
MC3 PRM PR2
PR3BS
SR3
SR2
SRM
ITMX
ITMY
ETMX
ETMY
MT1
MT2
37cm
10cm
Core optics of KAGRA
Mirrors for Main cavitiesInitial: Silica
Final: Sapphire
20
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。
酸化アルミニウム( Al2O3)
Single crystal with diameter 25㎝ , thickness 10㎝ and Mass 20kg.
Optical property fluctuation Sapphire
2121
Requirements for Sapphire
Sapphire
• C-axis mirrors (25cm x t15cm) .– Current: 22cm、 t15cm
• Absorption Cofficient: < 20 ppm/cm – Current 50-100 ppm/cm?
22
AA149 48 47
AC150 229 138 682 687
P401 34 32 65 67
Name Absorption [ppm/cm]
10 Samples from CSI have been measured
Sapphire: Preliminary results
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)
1000 2000 3000 4000 5000 6000
- 0.15
- 0.10
- 0.05
0.00
0.05
0.10 AC150- A1 P401- A9
(a.u.)
信号強度
Field (G)
Signal A
Signal B
Signal C
Ip-p
Preliminary results
Collaborators
Dr. Masahiro Hori, University of Toyama
Prof. Norikatsu Mio, The university of TokyoProf. Seiji Kawamura, The university of TokyoMr. Nobuhiro Fukumoto, The university of Tokyo