LIGO-G070xxx-00-M December 19, 2007 Single Stage ISI Electronics Overview Ben Abbott Mohana Mageswaran December 19, 2007.

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Presentation transcript:

LIGO-G070xxx-00-M December 19, 2007 Single Stage ISI Electronics Overview Ben Abbott Mohana Mageswaran December 19, 2007

LIGO-G070xxx-00-M December 19, Single Stage ISI

LIGO-G070xxx-00-M December 19, HAM views springs and sensors under the table top access to a vertical sensor

LIGO-G070xxx-00-M December 19, HAM ISI Sensors

LIGO-G070xxx-00-M December 19, HAM 6 Drive

LIGO-G070xxx-00-M December 19, Stage 2 Control at Stanford stage 1 motion stage 2 motion w/ feedback isolation stage 2 motion w/ damping HAM req Preliminary data

LIGO-G070xxx-00-M December 19, Seismic Isolation Electronics HAM 6 Racks

LIGO-G070xxx-00-M December 19, Seismic Isolation Electronics Seven kinds of Electronics modules are needed for the HAM ISI Installation. » Binary I/O Interface » Anti-Image Chassis » Anti-Alias Chassis Rev.7B » STS-2 Interface » ISI Interface Chassis » ISI Coil Driver » Capacitive Position Sensor Field Interface Box » LSU Locker/Unlocker CDS Electronics Modules Some Electronics are shared in the HAM6 rack. » Timing Board » PCIX I/O Chassis » Anti-Alias Chassis Rev.10

LIGO-G070xxx-00-M December 19, Single Stage ISI Interface Inputs come from 4 GS-13 seismometers, and 4 Capacitive position Sensors. Chassis interfaces signals with ADCs, DACs and Binary I/O modules. GS-13 Interface has switchable x1 and x10 gain, and two stages of simultaneously switchable whitening with 0.1 Hz zeroes, and 1 Hz poles. Capacitive Position Interface Card supplies power, and routs signals. It has no gain or filtration. ISI Interface Block Diagram

LIGO-G070xxx-00-M December 19, Capacitive Position Sensor Interface Box

LIGO-G070xxx-00-M December 19, Capacitive Position Sensor Noise

LIGO-G070xxx-00-M December 19, Capacitive Position Sensor Interface

LIGO-G070xxx-00-M December 19, Seismic Isolation Electronics ISI Information Block Diagram

LIGO-G070xxx-00-M December 19, Actuator Electronics 1.The Coarse and Fine actuators used in the ISI are custom manufactured by PSI (Planning Systems Inc.). 2.The coarse actuators are used to actuate in the horizontal and vertical directions at each of the three locations around the HAM. 3.Coarse actuator is capable of generating a continuous force of maximum 20 lb and the Coil Driver is capable of providing the current to produce this force.

LIGO-G070xxx-00-M December 19, Actuators CoarseFine Magnitude Wire Gauge18 AWG round wire24 AWG round wire Continuous Force20 lb10 lb deg C)6.1 ohm9.3 ohm Inductance~5 mH~3 mH Self-resonant frequency~200 KHz~275 KHz Hi-Pot Test(500 VDC for 60 sec)>500 MOhm Force Constant at Central Position6.74 lb/amp6.9 lb/amp Imax = (20 lb) / (6.74 lb/amp) = 3A Vmax = (3 A) * (6.1 ohm) = 18.3 volts (neglect the cable loss)

LIGO-G070xxx-00-M December 19, Noise Specifications The output current noise requirements are most restrictive for the Fine driver and are as follows: FrequencyNoise Requirement Freq > 30 Hz3nA/sqrt(Hz) 10 Hz < freq < 30 Hz8 nA/sqrt(Hz) 1 Hz < freq < 10 Hz45 nA/sqrt(Hz) freq < 1Hz(45 nA/sqrt(Hz) * (1/freq)

LIGO-G070xxx-00-M December 19, The DAC input is +/- 20 V and noise level is 5µV/sqrt(Hz). The DAC stage is surrounded by a digital whitening and analog de whitening filter to address the noise associated with the DAC. De whitening Filter Hz and Hz is added to lower the noise after the differential DAC Input.

LIGO-G070xxx-00-M December 19, Noise measured using the SR785

LIGO-G070xxx-00-M December 19, Complete assembled chassis