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