Data acquisition and data processing software for magnetic measurements for NICA magnets Alexander Bychkov LHEP, JINR 2017

Contents Main Measurement Program Filtering and smoothing system based on wavelets and splines

Measurement test bench Computer Rack Cabinet Controlled Power Supply

Main Measurement Program

System Characteristics Automated system (minimal operator actions) Cold and warm measurements 24-bit ADC/DAC 200 000 samples/s per channel Saving data - RAW Sensor positioning <1⋅10-4 220 steps/rot

Signal form and Data acquisition NI DAQmx chassis base signal Synchronized DACs data Synchronized ADCs execution Main Measurement Program LabView triggering triggering

Sensor position management Main Measurement Program LabView LAN Real-Time controller EtherCat Servo drive Sensor position

Functions of Main Measurement Program base signal Synchronized DACs NI DAQmx chassis data Synchronized ADCs base signal execution triggering Current supply triggering data Main Measurement Program LabView current impulse COM GPIB Sensor coils switch Magnet coils switch LAN Real-Time controller data GPIB Current Supply controller Sensor EtherCat position Servo drive Superconducting Magnet

Measurement data collection Measurement Data flow Data storage Temporal files Preprocessing data Filtering Smoothing Integration Measurement data collection Processing data Results

Wavelet peak detection Preprocessing data Complex noise Minimal noise Wavelet filtering Wavelet peak detection Spline smoothing Integration Integration

RAW data I(t)

Power spectrum

Wavelet filtration I(t)

Peak detection (wavelet)

Spline smoothing

Comparison: RAW and filtered data (1)

Comparison: RAW and filtered data (2) Average error ~10-6 Worst situation error ~10-3

Thank you!