Takanori Sekiguchi Status of Cryogenic Payload Overall Design 1 T. Sekiguchi, E. Hirose JGW-G1302072.

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Presentation transcript:

Takanori Sekiguchi Status of Cryogenic Payload Overall Design 1 T. Sekiguchi, E. Hirose JGW-G

Takanori Sekiguchi 2 KAGRA SAS status talk Simulink control model for aLIGO seismic isolation Reasons to design mechanics with control in mind Study from AEI-SAS, LIGO SEI, SUS Discussion: how to build type-A SAS design? how to set the requirement

Takanori Sekiguchi 3 Design Direction Suspension thermal noise from RM can be large. Fundamental noises (seismic, thermal noise) should be considered in first priority. Controllability is the second issue. LIGO-like design should be chosen.

Takanori Sekiguchi 4 Control Noise 1.Making SAS model, with top-stage (IP) control. 2.Designing control filters at the lower stages so that it meets the requirement. 3.Calculate the TF from sensor/actuator noise to the TM displacement. 4.Set the requirement on sensor/actuator noise

Takanori Sekiguchi 5 TM Requirement Seismic displacement noise – 2 x Hz, 3 x Hz : Longitudinal – 2 x Hz, 3 x Hz : Vertical – m RMS without global control (2.5 x m in adv. LIGO differential) – m/sec RMS without global control – (10 -5 m RMS in transversal motion in adv. LIGO) Angular noise – 2 x Hz, 3 x Hz : Pitch / Yaw – rad RMS without global control (10 -7 rad in adv. LIGO, ~10 -6 rad in iLIGO) Damping time – 1/e damping time: < 60 sec (10 sec in adv. LIGO)

Takanori Sekiguchi 6 aLIGO Quantitative Test Goals

Takanori Sekiguchi 7 Mon: Control model in Stanford (Brian) Tue: KAGRA overview talk (Eiichi) Study from AEI 10m SAS (Conor) KAGRA-SAS modeling (Takanori) Wed: Cryogenic payload design (Takanori) Thu: Reasons to design mechanics with control in mind (Jeff) Guardian (Charles) Prototype test plan in aLIGO (Jeff) Fri: Discussion How to build Type-A SAS design? How to set the requirement?