Information of the Type-A Seismic Attenuation System (SAS). This page wants information about not only room-temperature parts but also cryogenic vibration isolation system.

• Working log

Drawings

• Type-A SAS whole assy
• Vacuum chamber

  • Vertical (IXV, EXV, IYV, EYV)

  • Cryostat

Room-temperature parts

• Earthquake stop - Security frame

• Pre-Isolator

  • Top Filter (TF)

  • Inverted Pendulum (IP)

  • F0 LVDT-actuator unit

  • Blade spring for static position adjustment

• Magnetic Damper (MD)

• Standard Filter (SF)

• Bottom Filter (BF)

  • BF LVDT and Attachments

• Fishing rod

• Maraging wire

• Dummy Payload

• Hoist's tools

Cryogenics

• Cryo-Payload assy
• Platform (PF)
• Marionette (MT)
• Marionette Recoil Mass
• Intermediate Mass (IM)
• Intermediate Recoil Mass
• Test Mass (TM) - Sapphire Mirror
• Recoil Mass
• Heat link
  • Heat link suspension

Documents

Reports

• Requirements for Type-A SAS

Installation Procedure

• Initial concept

• Installation procedure of Type-A system

Measurement and Analysis

• Type-A Control Simulation

  • Parameters for simulation

    • Shared with Google spread sheet (Browsing and commenting are permitted. Please contact to Okutomi for editing permission.)
    • Under checking the parameters to be more realistic based on measurements and drawings

• [2016.08.15] Measurements of Standard Filter

  • Data of weight, optimal load, GAS resonant frequency, keystone height
  • Combination of the standard filters for Type-A with ID
    • Heavy set: 3-2(F1), 2-2(F2), 1-4(F3)
    • Light set: 3-3(F1), 2-1(F2), 1-3(F3)

• [2016.09.30] Measurements of BF LVDT Prototype

• [2016.11.15] Bottom filter optimal wight re-measurement

Electronics

• General

  • List of drivers for VIS

  • Lecture of Standalone Digital system for VIS

• LVDT

  • LVDT Driver

  • LVDT-coil distributor

  • LVDT-coil combiner
• Accelerometer
  • ACC driver
• Coil-magnet actuator

  • High power coil driver

  • Low power coil driver

• Optical lever
  • QPD board
• Stepper motor
  • Stepper motor driver
• Picomotor
  • Picomotor driver
• Cabling

Members of Type-A Team

• Ryutaro TAKAHASHI (Leader)
• Hideharu ISHIZAKI
• Naohisa SATO
• Koki OKUTOMI

Schedule

Task list

Meeting

• NAOJ VIS Meeting Minutes

• Type-A team meeting Minutes

See also

• JGW-E1504005: VIS Document and Drawing Tree (Type-A)

• KAGRA Dropbox > Subsystems > VIS > TypeA

• KAGRA/Subgroups/CRY