Cryogenic System Integration Meeting 2014 FY

2014.06.17

Management & Schedule (Suzuki)
- 大幅な予算削減が行われることになる。特推が使えるようになる。KEKで事務の準備が進んでいる。契約課からの発注。見積もりを鈴木経由で契約課へ。外国からの直接購入はしない。
- Kume-san supports to design of payload and so on. His authorship must be checked.
Installation (Tomaru, Suzuki)
- Y end installation (transportation) will start on 18th of July. At least 2 persons must be at site to check status. They must stay within one week. Probably, Suzuki-san and Kimura-san ?
- Test of truck for vacuum pipes will be done; instead of these pipes, 12m cryo duct will be used.
- Car leasing must be prepared.
Mirror Cryostat (Sakakibara, Kimura)
- Pipe for SAS : Discussion with Mechanical Engineering Center of KEK is in progress.
Duct Shield (Sakakibara, Kimura)
- Heat transfer measurement is in progress.
Cryocoolers (Tomaru, Suzuki)
Room temperature SAS (Sekiguchi, Takahashi)
Cryo-Payload
- Heat link (Sakakibara)
- Design (PF, IM, IMR) (Hirose, Sekiguchi, Rahul, Takahashi)
- Fabrication (PF, IM, IMR) (Tomaru):
- Moving Mass (Chen, Tomaru):
- Recoil mass
- Sapphire Mirror (Hirose)
  - CLIKでのサファイアサス試験の準備をひきつづき行っている
    - アセンブリ確認用のアルミパーツ（ロッドとヘッド）を製作した。
    - コイルアクチュエータ用ボビン、クランプなどは現在物性研工作室で製作中。
    - コーティングQ値測定で使用していたCLIKが温まり次第、レイアウトを最終確認してフレームなどを発注する。
  - Rahulが耳タイプのFEA計算をはじめた。（サイドフラット、耳、ヘッドはひっかけるタイプ）
- Sapphire Mirror Suspension (Chen, Sascha, Yamamoto)
  - Koike-san calculated deformation of sapphire bulk on Fe and Sn plate Slides(S. Koike). He takes flat cut on barrel surface of sapphire mirror into account. The result does not depend on the flat cut. In short, flat cut does not change stress distribution in sapphire bulk.
- Test
- Status of R&D (K. Yamamoto)
- Misc
Minutes(K. Yamamoto)

2014.06.10

Management & Schedule (Suzuki)
- 大幅な予算削減が行われることになる。
Installation (Tomaru, Suzuki)
Mirror Cryostat (Sakakibara, Kimura)
- Shield pipe for SAS with one pipe (Koike)
Duct Shield (Sakakibara, Kimura)
Cryocoolers (Tomaru, Suzuki)
Room temperature SAS (Sekiguchi, Takahashi)
Cryo-Payload
- Heat link (Sakakibara)
- Design (PF, IM, IMR) (Hirose, Sekiguchi, Rahul, Takahashi)
- Fabrication (PF, IM, IMR) (Tomaru):
- Moving Mass (Chen, Tomaru):
- Recoil mass
- Sapphire Mirror (Hirose)
- Sapphire Mirror Suspension (Chen, Sascha, Yamamoto)
  - Design of ears and flat cut is discussed.
- Test
- Status of R&D (K. Yamamoto)
- Misc
  - Ishizaki-san (on behalf of safety control office) would like to explain Hazard Analysis in this week (one or two weeks later).
Minutes(K. Yamamoto)

2014.06.03

Management & Schedule (Suzuki)
- 大幅な予算削減が行われることになる。内容の再考が必要。
- A drastic trimming of budget for Cryopayload will be happened.
  - We have to reconsider items.
Installation (Tomaru, Suzuki)
Mirror Cryostat (Sakakibara, Kimura)
Duct Shield (Sakakibara, Kimura)
Cryocoolers (Tomaru, Suzuki)
Room temperature SAS (Sekiguchi, Takahashi)
Cryo-Payload
- Heat link (Sakakibara)
- Design (PF, IM, IMR) (Hirose, Sekiguchi, Rahul, Takahashi)
- Fabrication (PF, IM, IMR) (Tomaru):
- Moving Mass (Chen, Tomaru):
- Recoil mass
- Sapphire Mirror (Hirose)
  - MIR
    - ETM研磨は来年度に繰り越した
    - CSIROと側面を円柱面で高精度に仕上げる方法について協議中
  - タイプA設計
    - プロトタイプ試験（信光社に依頼してあるブレード、TM、ロッドなどからなるシステム試験のこと）の準備をすすめている。フレーム、アクチュエータ（コイルボビンや磁石の選定）などの設計はほぼ終わり、ダイナミクスをモニターするための光の取り回しなどについて検討中。７月に試験開始予定。
    - Rahulがパーツ間でのボンディングロスなどを考慮したモデルで解析をすすめている
    - HPDとの件は財源を確保できるかどうか確認しないと話をすすめられないので現在ストップ。
    - 関口くんがPF用縦ばねの詳細設計を先週おこなった。
- Sapphire Mirror Suspension (Chen, Sascha, Yamamoto)
- Test
- Status of R&D (K. Yamamoto)
Minutes(K. Yamamoto)

2014.05.20

Management & Schedule (Suzuki)
- 大幅な予算削減が行われることになる。内容の再考が必要。
- A drastic trimming of budget for Cryopayload will be happened.
  - We have to reconsider items.
Installation (Tomaru, Suzuki)
- Design drawing of clean booth (CAD drawing for clean booth(Shinji Miyoki))
Mirror Cryostat (Sakakibara, Kimura)
Duct Shield (Sakakibara, Kimura)
Cryocoolers (Tomaru, Suzuki)
Room temperature SAS (Sekiguchi, Takahashi)
Cryo-Payload
- Heat link (Sakakibara)
- Design (PF, IM, IMR) (Hirose, Sekiguchi, Rahul, Takahashi)
- Fabrication (PF, IM, IMR) (Tomaru):
- Moving Mass (Chen, Tomaru):
- Recoil mass
- Sapphire Mirror (Hirose)
- Sapphire Mirror Suspension (Chen, Sascha, Yamamoto)
  - Outlines and strategies of sapphire mirror suspension (final version) is discussed in the payload meeting.
- Test
- Status of R&D (K. Yamamoto)
Minutes(K. Yamamoto)

2014.05.13

Management & Schedule (Suzuki)
- 大幅な予算削減が行われることになる。（~41%）内容の再考が必要。
- A drastic trimming of budget for Cryopayload will be happened.(~41% of the original)
  - We have to reconsider items.
Installation (Tomaru, Suzuki)
- Available angles on optical windows: Optical windows 2 (T.Tomaru)
Mirror Cryostat (Sakakibara, Kimura)
- Radiation shield pipes for SAS holes: Shield Pipe SAS (T.Tomaru)
Duct Shield (Sakakibara, Kimura)
Cryocoolers (Tomaru, Suzuki)
Room temperature SAS (Sekiguchi, Takahashi)
Cryo-Payload
- Heat link (Sakakibara)
- Design (PF, IM, IMR) (Hirose, Sekiguchi, Rahul, Takahashi)
- Fabrication (PF, IM, IMR) (Tomaru):
- Moving Mass (Chen, Tomaru):
- Recoil mass
- Sapphire Mirror (Hirose)
- Sapphire Mirror Suspension (Chen, Sascha, Yamamoto)
  - Report about outlines of sapphire mirror suspension (final version) should be written as soon as possible.
- Test
- Status of R&D (K. Yamamoto)
  - Control systems are absolutely necessary and could be expensive. We will discuss this topic in the payload meeting.
Misc (K. Yamamoto)
- Main closing item in A/I list
  - (#080) Kazuhiro checks whether 80 cables can be along the metal wire between Bottom filter and Platform. You can check in his office by today.
  - (#109) Bending length of thick fibers. In progress. Bending length of thick fibers
  - (#112)Kazuhiro summarize memo(Japanese). He add figure to show requirements of each part in cryo payload.Cryogenic payload requirement(English).
Minutes(K. Yamamoto)

2014.04.30

Management & Schedule (Suzuki)
Installation (Tomaru, Suzuki)
Mirror Cryostat (Sakakibara, Kimura)
Duct Shield (Sakakibara, Kimura)
Cryocoolers (Tomaru, Suzuki)
Room temperature SAS (Sekiguchi, Takahashi)
Cryo-Payload
- Heat link (Sakakibara)
- Design (PF, IM, IMR) (Hirose, Sekiguchi, Rahul, Takahashi)
- Fabrication (PF, IM, IMR) (Tomaru):
- Moving Mass (Chen, Tomaru):
- Recoil mass
- Sapphire Mirror (Hirose)
- Sapphire Mirror Suspension (Chen, Sascha, Yamamoto)
  - Report about outlines of sapphire mirror suspension (final version) should be written as soon as possible.
  - Round polish or Flat cut ? : Round polish (and ears) must be expensive and risk in manufacturing mirror is smaller. On the contrary, the cost of flat cut is not extremely expensive (about 3000 Euro, IMPEX. Flat cut is far from reflective surface) and risk in manufacturing mirror is larger. The deadline of decision is in June. What kinds of information is necessary ?
    - Round polish : Strength test of bonding (Yusuke asked quotation to Shinkosha ?)
    - Flat cut : ?
- Test
- Status of R&D (K. Yamamoto)
  - Kazuhiro Yamamoto takes over the cryogenic test of metal blade spring in PF although Takahashi-san and Ishizaki-san still are in charge of design and procurement. Kazuhiro has some questions.
    - When is the deadline of test ? End of June ?
    - Size in total (Kazuhiro would like to check whether it can be put in 1/4 cryostat)
    - Compensation system or something similar for vertical drift by cooling
Misc (K. Yamamoto)
- Meeting for layout around vacuum chamber (2nd of May, Ando lab). Mainly, layout (of mortar) in the center room will be discussed. Somebody in CRY attends ?
- Safety : We must take care of it in installation phase. Ohishi-san would like to discuss this topic in this meeting near future.
- Fresh persons : Toyoda-san joins. He comes every Tuesday at least. Two new graduate students (Prof. Kajita) join the cryogenic experiments every Thursday and Friday although they could change their topics later.
Minutes(K. Yamamoto)

2014.04.22

Management & Schedule (Suzuki)
Installation (Tomaru, Suzuki)
Mirror Cryostat (Sakakibara, Kimura)
Duct Shield (Sakakibara, Kimura)
- Duct Shield Test(Y. Sakakibara)
Cryocoolers (Tomaru, Suzuki)
Room temperature SAS (Sekiguchi, Takahashi)
Cryo-Payload
- Heat link (Sakakibara)
- Design (PF, IM, IMR) (Hirose, Sekiguchi, Rahul, Takahashi)
- 1) Finally Bill Hollander at HPD contacted me proposing a meeting in a couple of days.
- 2) Hirose visited Shinkosha to discuss ear configuration. I proposed a strength test with test pieces which is similar to what we have done at KEK. It is essentially a pulling test with R125 surfaces done by them. Yusuke made drawings and asked a quotation already.
- 3) Rahul is preparing models to predict performance of both cradle and ear configuration.
- 4) Vertical spring in PF: Takanori designed a prototype and we are asking Eric to review it and refine it.
- 5) Ryutaro is visiting Eric to discuss this.
- 6) Vertical spring test will be taken over by Kazuhiro?
- 7) Hirose will be absent due to attend a seminar in Tokyo.
- Fabrication (PF, IM, IMR) (Tomaru):
- Moving Mass (Chen, Tomaru):
- Recoil mass
- Sapphire Mirror (Hirose)
- Sapphire Mirror Suspension (Chen, Sascha, Yamamoto)
- Test
- Status of R&D (K. Yamamoto)

2014.04.15

Management & Schedule (Suzuki)
- First kick-off meeting with MESCO for cryostat installation at Apr. 10 at Kamioka. Slides.
Installation (Tomaru, Suzuki)
- Optical windows (T.Tomaru)
Mirror Cryostat (Sakakibara, Kimura)
- CAD_Top_shieldpipe (Koike)
  - Original CAD sever: http://wiki.kek.jp/display/gw/Cryogenics+CAD
Duct Shield (Sakakibara, Kimura)
Cryocoolers (Tomaru, Suzuki)
Room temperature SAS (Sekiguchi, Takahashi)
Cryo-Payload
- Heat link (Sakakibara)
- Design (PF, IM, IMR) (Hirose, Sekiguchi, Rahul, Takahashi)
  - 1) Planning to have a review meeting of vertical spring (date is not determined yet)
  - 2) A quote came for a prototype ear from Shinkosha
  - 3) No answer from HPD yet
  - 4) Prototype test plan (cradle) was discussed yesterday (Yusuke uploaded minutes on archive). We need to prepare things before sapphire parts arrive. What we want to make clear are, verification of hanging, bounce mode frequency, mirror temperature with/without thermal input (~1W), fiver quality factor (comparison with independent measurement), to check dynamics of the mirror when pushing it with actuators and so on.
  - 5) Trying to build a system model to study thermal noise.
- Fabrication (PF, IM, IMR) (Tomaru):
- Moving Mass (Chen, Tomaru):
- Recoil mass
- Sapphire Mirror (Hirose)
- Sapphire Mirror Suspension (Chen, Sascha, Yamamoto)
  - Quotation for round polish was asked and we wait reply. We have quotation of flat cut.
- Test
- Status of R&D (K. Yamamoto)
  - In the last cryo payload meeting, we picked up R&D items behind schedule Minutes(K. Yamamoto).
  - What is the first priority ? What kinds of information are necessary for design ?
  - Vertical metal spring : Temperature dependence of Young's modulus and resonant frequency. According to schedule, by the end of March, one blade spring cryogenic test and triple blades procurement are finished.But actually, not yet. Triple blades must be prepared soon.
  - Heat links : Measurement of thermal resistance at end of heat link. The result affect the number of heat links. Layout (geometry must be symmetric).
  - Control : Test for stepping motor and thrust bearing. Active damping system. Coil magnet actuator. Sizes of these systems are necessary for design (how accurate ?).
Baffle and Auxiliary Optics Subsystem (Akutsu)
Minutes(K. Yamamoto)

2014.04.07

Management & Schedule (Suzuki)
- First kick-off meeting with MESCO for cryostat installation at Apr. 10 at Kamioka. We will discuss about installation schedule of the end cryostats.
Installation (Tomaru, Suzuki)
- Cryo-installation (T.Tomaru)
Mirror Cryostat (Sakakibara, Kimura)
Duct Shield (Sakakibara, Kimura)
- We will release a specification document of duct shield in this week. Three duct shield will be fabricated in this FY.
Cryocoolers (Tomaru, Suzuki)
- We will release a specification document of first three low-vibration cryocoolers for the duct shields in this week. Now we discuss about the cost of one-stage pulse-tube cryocoolers with the cryocooler company since they are under considering the price down of the PTC. If the price is acceptable, we will not chose solvey cryocoolers but chose PTCs.
Room temperature SAS (Sekiguchi, Takahashi)
Cryo-Payload
- Heat link (Sakakibara)
- Design (PF, IM, IMR) (Hirose, Sekiguchi, Rahul, Takahashi)
  - A remote meeting was held on March 28th.
  - HPD gave us a quote for moving mass for PF and IM, and torsion adjustment
  - We gave them links to room-temperature VIS. They are looking into them to figure out an estimate for preparing necessary drawings for the modification.
  - We ordered sapphire parts for the cradle configuration to Shinkosha.
  - We would like to propose for an ear configuration (will explain it today). I asked a quotation about the ear to Shinkosha.
  - Rahul is preparing models for ANSYS.
  - Takanori is looking into control issues (sensors and actuators)
  - Takahashi-san started a cryogenic bade test
  - Need to prepare a solid test plan for the system (installation, strength, heat conductivity, controllability, and so on)
- Fabrication (PF, IM, IMR) (Tomaru): Suzuki-san and I had meeting with Mitaka-koki Co. for Cryo-pendulum fabrication. They have interesting in our cryo-payload fabrication and accepted the style that they fabricate the payload with R&D with us.
- Moving Mass (Chen, Tomaru): I got stepping motor which can work at cryogenic temperature but it didn't have driver. Can we get it?
- Recoil mass
- Sapphire Mirror (Hirose)
  - Contracts for FY2014 are in preparation.
- Sapphire Mirror Suspension (Chen, Sascha, Yamamoto) Yesterday, we discussed the strategy. Fiber nail head is hooked by blade spring which is similar to that from Shinkosha. For comparison, we must collect quotations for flat cut or round polish.
- Test
Baffle and Auxiliary Optics Subsystem (Akutsu)
- Location of a wide-angle baffle should be discussed.
- Interface parts between a wide-angle baffle and a cryo-duct shield should be discussed.
- Non-arm side, i.e. btwn BS-ITM, we need to consider the way to control stray light; as a reference, there are no baffles are installed closed to the ITM side in LIGO so far, but around BS, there is a baffle.
- The recoil mass of the ITMs/ETMs should have also a function of baffle. Let's consider about it.
Minutes(K. Yamamoto)