Differences between revisions 34 and 123 (spanning 89 versions)
⇤ ← Revision 34 as of 2013-09-30 12:13:17 →
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Editor: OsamuMiyakawa
Comment:
← Revision 123 as of 2020-01-31 14:07:44 → ⇥
Size: 9074
Editor: MasahiroKamiizumi
Comment:
Deletions are marked like this. Additions are marked like this.
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||<style="background-color: #E08030;text-align: center;">'''Members'''||<style="background-color: #E08030;text-align: center;">'''Meetings'''||<style="background-color: #E08030;text-align: center;">'''Logs'''||<style="background-color: #E08030;text-align: center;">'''Wikis'''||
||[[KAGRA/Subgroups/AEL/Members|Members of AEL]]||[[KAGRA/Subgroups/AEL/meeting|AEL meeting]]||[[http://gwclio.icrr.u-tokyo.ac.jp/lcgtsubgroup/electronics/|AEL Blog]]||[[KAGRA|KAGRA wiki]]||
||[[KAGRA/Subgroups/Members|KAGRA subgroup members]]||[[http://gwcenter.icrr.u-tokyo.ac.jp/conference/calendar|KAGRA calendar]]||[[http://gwclio.icrr.u-tokyo.ac.jp/lcgtsubgroup/|KAGRA blog]]|| ||
|| || || || ||		  * [[KAGRA/Subgroups/AEL/RequestOfProduction|Procedure for requesting circuit production]]([[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2527|Request form]])
Line 8: Line 5:
||<style="background-color: #E08030;text-align: center;">'''Documents'''||<style="background-color: #E08030;text-align: center;">'''Projects'''||
||[[KAGRA/Subgroups/AEL/Documents|AEL related documents]]||[[KAGRA/Subgroups/AEL/Projects/TTFSS|TTFSS]]||
||[[KAGRA/Terminology#DGS|KAGRA Acronyms]]||[[KAGRA/Subgroups/DGS/Projects/LVDT|LVDT driver]]||
||[[http://gwdoc.icrr.u-tokyo.ac.jp|JGWdoc]]||[[KAGRA/Subgroups/DGS/Projects/CoilDriver|Coil driver]]||
||[[http://www.google.com/cse/home?cx=017444024272121679524:7p2pwvc2k2c|JGW document search by google]]||[[KAGRA/Subgroups/DGS/GEOPhone|GEO phone interface]]||
|| ||[[KAGRA/Subgroups/DGS/Projects/SteppingMotor|Stepping motor]]||
|| ||[[KAGRA/Subgroups/DGS/Projects/OpLev|Optical lever]]||		  * [[KAGRA/Subgroups/AEL/PlaceOfCoilDriver|Place of coil driver]]
Line 16: Line 7:
==== Places of various circuit Chassis ====
[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=11438|E2011438]]
Line 17: Line 10:
== Meeting == ||<style="background-color: #80E030;text-align: center;">'''Members'''||<style="background-color: #80E030;text-align: center;">'''Meetings'''||<style="background-color: #80E030;text-align: center;">'''Logs'''||<style="background-color: #80E030;text-align: center;">'''Documents'''||<style="background-color: #80E030;text-align: center;">'''Projects'''||
||[[KAGRA/Subgroups/AEL/Members|Members of AEL]]||[[KAGRA/Subgroups/AEL/meeting|AEL meeting]]||[[http://gwclio.icrr.u-tokyo.ac.jp/lcgtsubgroup/electronics/|AEL Blog]]||[[KAGRA/Subgroups/AEL/Documents|AEL related documents]]||[[KAGRA/Subgroups/AEL/Circuits/DCPowerSupply|DC power supply]]||
||[[KAGRA/Subgroups/Members|KAGRA subgroup members]]||[[http://gwcenter.icrr.u-tokyo.ac.jp/conference/calendar|KAGRA calendar]]||[[http://gwclio.icrr.u-tokyo.ac.jp/lcgtsubgroup/|KAGRA blog]]||[[KAGRA/Terminology#DGS|KAGRA Acronyms]]||[[KAGRA/Subgroups/DGS/Projects/STDA/Dsub9|D-SUB cable]]||
||[[KAGRA/Subgroups/AEL/ContactPerson|Contact person in subsystem]]|| ||[[KAGRA|KAGRA wiki]]||[[http://gwdoc.icrr.u-tokyo.ac.jp|JGWdoc]]||[[KAGRA/Subgroups/AEL/Circuits/RF|RF electronics]]||
|| || || ||[[http://www.google.com/cse/home?cx=017444024272121679524:7p2pwvc2k2c|JGW document search by google]]||[[KAGRA/Subgroups/AEL/Circuits/List|Circuits list]]||
|| || || ||[[KAGRA/Subgroups/AEL/ToBuy|To buy list]]|| [[KAGRA/Subgroups/AEL/Rackcheck|Rack check ]] ||

------
<<Anchor(list)>>
== List of manufactured/currently being manufactured circuits ==
Line 19: Line 21:
=== 2013/9/2 15:00~ === ||<style="background-color: #80E030;text-align: center;">Group||<style="background-color: #80E030;text-align: center;">Name||<style="background-color: #80E030;text-align: center;">Lot No.||<style="background-color: #80E030;text-align: center;">必要数||<style="background-color: #80E030;text-align: center;">JGWDoc No.||<style="background-color: #80E030;text-align: center;">受付日||<style="background-color: #80E030;text-align: center;">受渡し(予定)日||<style="background-color: #80E030;text-align: center;"> ||<style="background-color: #80E030;text-align: center;">Design||<style="background-color: #80E030;text-align: center;">製作||<style="background-color: #80E030;text-align: center;">Chassis||<style="background-color: #80E030;text-align: center;">組込み||<style="background-color: #80E030;text-align: center;"> ||<style="background-color: #80E030;text-align: center;">完了日||
||VIS||[[KAGRA/Subgroups/AEL/Circuits/LVDT|Coil driver]]||001||5|| ||2013/5/29|| || ||o||-||o||-|| ||2014/1/15||
||VIS||[[KAGRA/Subgroups/AEL/Circuits/LVDTDistributor|LVDT signal distributor]]||001||1||[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2124|D1402124]]||2013/11/18||2014/1/31|| ||o||o||o||o|| ||2014/2/4||
||VIS||[[KAGRA/Subgroups/AEL/Circuits/LVDTDistributor|LVDT signal distributor]]||[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=3398|002]]||20||[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2124|D1402124]]||2015/3/12||2015/5/31|| ||o||o||o|| || ||2014/2/4||
||VIS||[[KAGRA/Subgroups/AEL/Circuits/GeoPhoneDistributor|Geo Phone signal distributor]]||001||1||[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2120|D1402120]]||2013/11/18||2014/1/31|| ||o||o||o||o|| ||2014/2/4||
||VIS||[[KAGRA/Subgroups/AEL/Circuits/LVDT|LVDT driver]]||001||8||[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2826|D1402826]]||2013/2/15||2014/11/30|| ||o||o||o||o|| ||2015/6/11||
||VIS||High Power Coil Driver||[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=3822|001]]||5||[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=3502|D1503502]]||2014/9/8||2014/12|| ||o||o||o||△|| || ||
||VIS||Low Power Coil Driver||001||22||[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=3506|D1503506]]||2014/9/8||2015/1~徐々に|| ||o||o||o||△|| || ||
||VIS||Satellite Box||001||1?||[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2809|D1402809]]||2014/10/2|| || ||o||o||o||△|| || ||
||VIS||[[KAGRA/Subgroups/AEL/Circuits/SteppingMotor|Stepper Motor Chassis]]||001|| || || || || || || || || || || ||
|| |||||||||||| || |||||||| || || ||
||IOO||[[KAGRA/Subgroups/AEL/Ciorcuits/TTFSS|TTFSS]]||001||1||[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=1751|D1301751]]||2013/1/28||2013/8/1|| ||o||o||o||o|| ||2013/9/13||
||IOO||[[KAGRA/Subgroups/AEL/Ciorcuits/TTFSS|TTFSS interface]]||001||1||[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=1752|D1301752]]||2013/1/28||2013/8/1|| ||o||o||o||o|| ||2013/9/13||
||IOO||[[KAGRA/Subgroups/AEL/Ciorcuits/CM|MC servo]]||[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=3243|001]]||1||[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=3705|D1503705]]||2015/1/23||2015/6/15|| ||o||o||o||o|| ||2015/7/15||
||IOO||[[KAGRA/Subgroups/AEL/Ciorcuits/TTFSS|PMC servo(TTFSS)]]||[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=3928|001]]||1||[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=1751|D1301751]]||2015/8/6||2015/9/7|| ||-||-||o||o|| ||2015/9/7||
||IOO||[[KAGRA/Subgroups/AEL/Ciorcuits/TTFSS|PMC servo(TTFSS) interface]]||[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=3928|001]]||1||[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=1752|D1301752]]||2015/8/6||2015/9/7|| ||-||-||o||o|| ||2015/9/7||
|| |||||||||||| || |||||||| || || ||
||MIF||RF PD||001||2|| ||2012/7/9||2012/10/31|| ||o||o||-||-|| ||2012/10/31||
||MIF||RF PD||002||40([[KAGRA/Subgroups/MIF/AEL/Photodetectors/RFPDList|List]])|| || || || ||o||o||-||-|| ||2015/10/19||
||MIF||RF PD interface||[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=3388|001]])||基板は20枚製作、12枚使って6台作る||[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=3818|D1503818]]||2015/5/9||(2015/8->)2015/10/19|| ||o||o||o||o|| ||2015/9/28||
||MIF||[[KAGRA/Subgroups/AEL/Circuits/IQdemod|I&Q demodulator]]||001||5||[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2412|D1402412]]||2013/9/2||2014/3/31|| ||o||o||o||o|| ||2014/10/31||
||MIF||RF QPD||001||5(基板は20枚)||[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2631|D1402631]]||2014/8/25||2015年8月|| ||○||△||-||-|| || ||
||MIF||RF QPD intercace||[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=3388|001]]||基板は10枚製作、10枚使って5台作る||[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=3818|D1503818]]||2015/5/9||(2015/8->)2015/10/19|| ||o||o||o||o|| ||2015/9/28||
|| |||||||||||| || |||||||| || || ||
||AOS||[[KAGRA/Subgroups/AEL/Circuits/OpLev|Optical lever]]||001||5||[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2411|D1402411]]||2013/7/4||2014/7/31|| ||o||o||-||-|| ||2014/7/31||
|| |||||||||||| || |||||||| || || ||
||DGS||[[KAGRA/Subgroups/DGS/Circuits/AntiAliasImage|AI filter]]||001||6|| ||2011/5/1||2012/3/31|| ||o||o||o||-|| ||2012/12/16||
||DGS||[[KAGRA/Subgroups/DGS/Circuits/AntiAliasImage|AA filter]]||001||6|| ||2011/5/1||2012/3/31|| ||o||o||o||-|| ||2012/12/16||
||DGS||[[KAGRA/Subgroups/DGS/Circuits/AntiAliasImage|AA filter]]||002||60|| ||2012/11/30||2013/3/31|| ||o||-||-||-|| ||2013/7/18||
||DGS||[[KAGRA/Subgroups/DGS/Circuits/AntiAliasImage|AI filter]]||002||40|| ||2012/11/30||2013/3/31|| ||o||-||-||-|| ||2013/7/18||
||DGS, MIF, GIF||[[KAGRA/Subgroups/DGS/Circuits/Whitening|whitening filter]]||001||10||[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2082|D1402082(9pin)]]<<BR>>[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2087|D1402087(15pin)]]||2012/11/1||2014/2/28|| ||o||o||o||o|| ||2014/10/24||
|| |||||||||||| || |||||||| || || ||
||AEL||Relay Control Box||001||4||[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2601|D1402601]]||2014/8/6||2014/8/21|| ||o||o||-||-|| ||2014/8/21||
||AEL||18V DC power strip||001||30||[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2390|D1402390]]||2014/4/1||2014/11/30|| ||o||-||o||o|| ||2015/1/9||
||AEL||12V DC power strip||001||30||[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2600|D1402600]]||2014/8/6||2015/8/20|| ||o||-||o||△|| || ||
Line 21: Line 57:
 . Files:

 . [[KAGRA/Subgroups/AEL/meeting/20130902|Minutes]]


=== 2013/8/19 15:00~ ===

 . Files:
  * [[attachment:KAGRA/Subgroups/AEL/private/OpLev_System Wiring052611-1.pdf|Oplev top view]]
  * [[https://dcc.ligo.org/LIGO-D1100290-v1/public|Oplev pre-amp]]
  * [[https://dcc.ligo.org/LIGO-D1100013-v1/public|Whitening filter]]

 . [[KAGRA/Subgroups/AEL/meeting/20130819|Minutes]]


=== 2012/11/9 10:00~ How to make a circuit using AEL ===
 . Files: [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/DocDB/ShowDocument?docid=1384|AELの方針と
AELを利用しての回路制作]]
 . [[KAGRA/Subgroups/AEL/meeting/20121109|Minutes]]


------

== Circuits for subsystem ==

----

== VIS ==
<<Anchor(VIS)>>
=== LVDT driver ===
 * [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=1253|D1201253]] Test Circuit of Voice Coil Driver
 * [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=1253|D1201251]] Presentation for MIF meeting
 * [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/DocDB/ShowDocument?docid=1255|D1201255]] LVDT-Actuator Driver Electronics
 * [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/DocDB/ShowDocument?docid=1467|JGW-D1201467]]: LVDT and Voice Coil Drivers Electric Circuits (1/5/2013

 * [[attachment:KAGRA/Subgroup/AEL/VIS/LVDT.zip|LVDT pictures]]

==== 2013/2/15 meeting (高橋、宮川、上泉) ====
 *何ch必要か -> 100ch -> 基板24枚
  * 8ch単位で一箱 -> 計12箱
 * 基板はニケフから購入することを考える
  * 基板の箱詰めを考える
   * 安定化電源内臓のため、外部から18Vを直結
   * インターフェース -> 要検討
    * 位相ねじにフロントパネルからアクセス(穴をあける)
    * テストピンが必要かどうか確認
 * 変調信号出力を箱の中に内臓
  * 変調周波数は固定（TAMAの回路図参考)
  * 外部から変調周波数を入れるのも作っておく
 * 箱詰めした回路の完成8月完成を目処

----
== Common Circuits or related things ==
=== DC Power Supply ===
 * '''Bipolar 24 Volt power supply'''
  . 24V power supplier / [[attachment:LCGT/subgroup/Electronics/DC_power_supply.pdf|selection report]]
 * '''Connector and cable'''
  . Cables for DC24V [[attachment:LCGT/subgroup/Electronics/DC_power_plan.pdf|selection report]]
 * '''[[attachment:LCGT/subgroup/Electronics/low_noise_regulator.pdf|+15V regulator (ultra low noise)]]'''
 * '''High voltages'''
  . QPD vias voltage (In TAMA case, 180V)
  . Coil driver (LIGO High-Voltage type: >140V)
  . PZT driver (DC >100V or AC power supply)

=== RF electronics ===
 * '''Oscillator'''
  . [[attachment:LCGT/subgroup/Electronics/SG010M3R0GB_test_sheet.pdf]]
  . [[CLIO/Technicals/OSCdata|CLIO related]]
  . [[attachment:LCGT/subgroup/Electronics/wenzel_500_13757B.pdf|Wenzel 500 of TAMA]]
    . reference: [[attachment:LCGT/subgroup/Electronics/TAMA_RF_2010.pdf|LO signal distribution for TAMA RSE]]
 * '''RF Photo detector'''
  . N. Mio [[http://iopscience.iop.org/1742-6596/122/1/012014|JPCS, 122, (2008) 012014]]
  . H. Grote [[http://rsi.aip.org/resource/1/rsinak/v78/i5/p054704_s1|RSI, 78, (2007), 054704]]
 * '''RF QPD detector'''
 * '''Demodulator'''
 * '''EOM driver'''

=== Audio Frequency electronics ===
 . As a general rule, differential signal transfer should be applied.
 . Dsub 9-pin connector and cable

 * '''[[CLIO/Tasks/DigitalControl|Digital front-end circuits]]'''
  * Anti-Alias / Anti-Imaging filter
  * Differential signal buffer Amp.
  * Whitening / De-whitening filter

 * '''Coil driver'''
 * '''AF photo detector for DC readout'''
 * '''Optical lever sensor'''

 * '''Ultra-Low-Noise Amp.'''
  . [[attachment:LCGT/subgroup/Electronics/SA200F3_noise.pdf|NF SA-200F3]]

=== Safety Control ===
 * '''Mechanical shutter for photo detector protection'''
 * '''Interlock switch'''		  . o: done
 . △: being processed
 . -: no task

Analog Electronics

Places of various circuit Chassis

E2011438

Members

Meetings

Logs

Documents

Projects

Members of AEL

AEL meeting

AEL Blog

AEL related documents

DC power supply

KAGRA subgroup members

KAGRA calendar

KAGRA blog

KAGRA Acronyms

D-SUB cable

Contact person in subsystem

KAGRA wiki

JGWdoc

RF electronics

JGW document search by google

Circuits list

To buy list

Rack check



List of manufactured/currently being manufactured circuits

Group

Name

Lot No.

必要数

JGWDoc No.

受付日

受渡し(予定)日

Design

製作

Chassis

組込み

完了日

VIS

Coil driver

001

5

2013/5/29

o

-

o

-

2014/1/15

VIS

LVDT signal distributor

001

1

D1402124

2013/11/18

2014/1/31

o

o

o

o

2014/2/4

VIS

LVDT signal distributor

002

20

D1402124

2015/3/12

2015/5/31

o

o

o

2014/2/4

VIS

Geo Phone signal distributor

001

1

D1402120

2013/11/18

2014/1/31

o

o

o

o

2014/2/4

VIS

LVDT driver

001

8

D1402826

2013/2/15

2014/11/30

o

o

o

o

2015/6/11

VIS

High Power Coil Driver

001

5

D1503502

2014/9/8

2014/12

o

o

o

△

VIS

Low Power Coil Driver

001

22

D1503506

2014/9/8

2015/1~徐々に

o

o

o

△

VIS

Satellite Box

001

1?

D1402809

2014/10/2

o

o

o

△

VIS

Stepper Motor Chassis

001

IOO

TTFSS

001

1

D1301751

2013/1/28

2013/8/1

o

o

o

o

2013/9/13

IOO

TTFSS interface

001

1

D1301752

2013/1/28

2013/8/1

o

o

o

o

2013/9/13

IOO

MC servo

001

1

D1503705

2015/1/23

2015/6/15

o

o

o

o

2015/7/15

IOO

PMC servo(TTFSS)

001

1

D1301751

2015/8/6

2015/9/7

-

-

o

o

2015/9/7

IOO

PMC servo(TTFSS) interface

001

1

D1301752

2015/8/6

2015/9/7

-

-

o

o

2015/9/7

MIF

RF PD

001

2

2012/7/9

2012/10/31

o

o

-

-

2012/10/31

MIF

RF PD

002

40(List)

o

o

-

-

2015/10/19

MIF

RF PD interface

001)

基板は20枚製作、12枚使って6台作る

D1503818

2015/5/9

(2015/8->)2015/10/19

o

o

o

o

2015/9/28

MIF

I&Q demodulator

001

5

D1402412

2013/9/2

2014/3/31

o

o

o

o

2014/10/31

MIF

RF QPD

001

5(基板は20枚)

D1402631

2014/8/25

2015年8月

○

△

-

-

MIF

RF QPD intercace

001

基板は10枚製作、10枚使って5台作る

D1503818

2015/5/9

(2015/8->)2015/10/19

o

o

o

o

2015/9/28

AOS

Optical lever

001

5

D1402411

2013/7/4

2014/7/31

o

o

-

-

2014/7/31

DGS

AI filter

001

6

2011/5/1

2012/3/31

o

o

o

-

2012/12/16

DGS

AA filter

001

6

2011/5/1

2012/3/31

o

o

o

-

2012/12/16

DGS

AA filter

002

60

2012/11/30

2013/3/31

o

-

-

-

2013/7/18

DGS

AI filter

002

40

2012/11/30

2013/3/31

o

-

-

-

2013/7/18

DGS, MIF, GIF

whitening filter

001

10

D1402082(9pin)
D1402087(15pin)

2012/11/1

2014/2/28

o

o

o

o

2014/10/24

AEL

Relay Control Box

001

4

D1402601

2014/8/6

2014/8/21

o

o

-

-

2014/8/21

AEL

18V DC power strip

001

30

D1402390

2014/4/1

2014/11/30

o

-

o

o

2015/1/9

AEL

12V DC power strip

001

30

D1402600

2014/8/6

2015/8/20

o

-

o

△

  • o: done
  • △: being processed
  • -: no task

KAGRA/Subgroups/AEL (last edited 2020-01-31 14:07:44 by MasahiroKamiizumi)