National Instruments NI PXI-1042 Quick Start Manual
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Summary of Contents for National Instruments NI PXI-1042
- Page 1 STJ / MPX-32D Quick Start Guide Version 2.01 This document describes XIA’s instrumentation system for setting up an STJ system with one or more MPX-32D 32-channel modular digital processors.
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Page 2: Table Of Contents
STJ Quick Start Guide v 2.01 April 1, 2021 CONTENTS Contents ................................. 1 Overview of the System ..........................3 MPX-32D Digitizer Module ......................... 3 Inputs and Outputs ..........................3 Banks and Channels ..........................4 Variable Gain ............................4 Sample Rate ............................4 STJ Analog Module ............................. - Page 3 STJ Quick Start Guide v 2.01 April 1, 2021 Scope Panel ............................18 Measure the RC Decay Time ......................18 Adjust the ADC Offset ........................20 MCA Panel ............................20 Preset Run Constraint ........................21 Statistics ............................21 Region of Interest (ROI) and Calibration................... 22 GainMatch Panel ..........................
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Page 4: Overview Of The System
STJ Quick Start Guide v 2.01 April 1, 2021 OVERVIEW OF THE SYSTEM The typical STJ system includes a cryostat with STJ detectors and associated control equipment provided by a 3 party combined with the following equipment provided by XIA: •... -
Page 5: Banks And Channels
STJ Quick Start Guide v 2.01 April 1, 2021 Analog Inputs 16-31 SAMTEC 16 differential-pair analog inputs VRDPC-50-01-M- LVDS I/O Harting 1 diff-pair analog output is driven by a 14-bit high-speed 27 21 121 8006 DAC, i.e. the built-in pulser signal 3 LVDS digital outputs –... - Page 6 STJ Quick Start Guide v 2.01 April 1, 2021 XIA’s STJ Analog module is a 32-channel preamplifier card, with an associated software-controlled STJ bias voltage DAC and input connection relay for each channel. A backplane diagnostic pulser signal is routed to each channel via a separate relay.
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Page 7: Preamplifier Schematic
STJ Quick Start Guide v 2.01 April 1, 2021 PREAMPLIFIER SCHEMATIC The basic preamplifier circuit is shown below. The primary feedback elements are a 1 MΩ resistor (which yields the transimpedance gain = 1 mV/nA) in parallel with a 1 pF capacitor. A secondary low-frequency feedback loop maintains the software-selected bias voltage at the STJ input. -
Page 8: Stj I/O Module
STJ Quick Start Guide v 2.01 April 1, 2021 The jumpers at location J400 are set by default, as shown at left below, to connect the preamplifiers to the built-in diagnostic pulser from the MPX-32D module via a software-controlled relay. To select the user pulser input connected to the STJ I/O front-panel SMA connector, move both jumpers towards the backplane connector, as shown at right below. -
Page 9: Custom Crate
STJ Quick Start Guide v 2.01 April 1, 2021 CUSTOM CRATE XIA provides a custom crate designed to house up to four STJ Analog modules (up to 128 STJ detector channels) and the STJ I/O module. INPUTS AND OUTPUTS Name Connector Type Description HDDSUB-78 x4... -
Page 10: Quick Start Guide
STJ Quick Start Guide v 2.01 April 1, 2021 QUICK START GUIDE STJ OR DIAGNOSTIC PULSER INPUT? The STJ Analog preamplifiers accept inputs both from the STJ detectors and from a diagnostic input, which is connected to either the built-in software-controlled pulser or a user-provided signal. We recommend starting with the built-in pulser to first familiarize the user with the software, settings and data acquisition procedures. -
Page 11: Review Pci Bus Connections
STJ Quick Start Guide v 2.01 April 1, 2021 REVIEW PCI BUS CONNECTIONS Open the Windows Device Manager (right-click on My Computer, select Manage, and then select Device Manager in left panel) and scroll down to and expand the Other Devices section. There should be a “XIA MPX-32D Digitizer and Pulse Processor”... -
Page 12: Using The Prospect Software
STJ Quick Start Guide v 2.01 April 1, 2021 USING THE PROSPECT SOFTWARE ProSpect is a Windows application that runs with XIA’s Handel drivers. It is primarily intended as a platform for system configuration, but ProSpect can also be used to acquire and save data. Fig 6: ProSpect is organized into three main areas: Channel Selection, Settings and the Data Panel. -
Page 13: Channel Selection
STJ Quick Start Guide v 2.01 April 1, 2021 CHANNEL SELECTION The Channel Selection tool applies to all panels and tools. The “Apply to All” check-box ensures that any changes to settings are applied to all modules in the system. •... - Page 14 STJ Quick Start Guide v 2.01 April 1, 2021 Fig 7: The Auxiliary tab with an STJ Analog auxiliary module connected to the currently selected MPX-32D module. STJ RELAY The most important setting on this panel is the STJ Relay Enable/Disable button. By default, STJ Analog on-board relays are open (as shown above): The STJ detectors are terminated with 1MΩ...
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Page 15: Detector Tab
STJ Quick Start Guide v 2.01 April 1, 2021 The PULSERATE setting controls the rate at which the DAC is updated: update rate = 20 ns * • 2^PULSERATE. Note that this setting affects the rise time and decay time! With the default value 0, the waveform spans 80 µs, with a 1 µs risetime and 5 µs decay time. -
Page 16: Acquisition Tab
STJ Quick Start Guide v 2.01 April 1, 2021 Note that with these settings, the built-in pulser (with default settings as shown in Figure 7) • should generate events with energy roughly equal to 1 keV and a count rate of 1 kcps. ACQUISITION TAB The Peaking Time and other Filter Parameter settings control the trapezoidal digital filtering algorithms. -
Page 17: Biasscan Panel
STJ Quick Start Guide v 2.01 April 1, 2021 These settings control the output scaling of the energy measurement, which correspond to the X-axis scaling and granularity in the MCA panel. We recommend always using the maximum Number of Bins: 8192 bins •... -
Page 18: Set Stj Zero
STJ Quick Start Guide v 2.01 April 1, 2021 Fig 8: The BiasScan panel acquires and displays the STJ I-V curve. The cursors are used to set the zero-point and bias voltage. Here are the typical settings used in our prior work with Tantalum STJ detectors: •... -
Page 19: Set Stj Bias
STJ Quick Start Guide v 2.01 April 1, 2021 centroid of the inflection point in the green (bias current) plot. Note that the value in the Zero Adjust changes with the cursor selection, and is highlighted yellow if the value is different from the saved STJ Zero. - Page 20 STJ Quick Start Guide v 2.01 April 1, 2021 Fig 9: The Scope panel showing a pulse from the built-in pulser (with default settings), with the Polarity set correctly As a check, change the Trace Type to Scaled Energy and acquire more traces. The output of the energy filter should be a trapezoid with slightly curved edges.
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Page 21: Adjust The Adc Offset
STJ Quick Start Guide v 2.01 April 1, 2021 Fig 10: This plot shows the Scaled Energy response to the on-board pulser signal with the Decay Time set properly: The waveform is trapezoidal, and properly damped ADJUST THE ADC OFFSET Each ADC channel has a dedicated DAC which operates under computer control to set the ADC offset. -
Page 22: Preset Run Constraint
STJ Quick Start Guide v 2.01 April 1, 2021 Check the Resume box to add data to the pre-existing histogram and statistics, or un-check the • box to start first clear the histogram and statistics before acquisition begins Check the Continuous box to have ProSpect automatically refresh the display at regular •... -
Page 23: Region Of Interest (Roi) And Calibration
STJ Quick Start Guide v 2.01 April 1, 2021 REGION OF INTEREST (ROI) AND CALIBRATION The ROI tool below the histogram is used to select peaks of interest and calibrate the gain on a per- channel basis. • Note that for multi-channel systems we recommend using the GainMatch tool instead of the ROI tool to calibrate all active channels at once Edit the Lower and Upper fields to place an ROI that encloses the peak of interest. -
Page 24: Mapping Panel: List-Mode Data Acquisition
STJ Quick Start Guide v 2.01 April 1, 2021 Enter the desired Calibration Energy and Acquisition Time(s). Note that the Acquisition Time • should be sufficient, based on the Input Count Rate, to acquire a peak whose Mean and FWHM can be measured;... -
Page 25: Mapping Options
STJ Quick Start Guide v 2.01 April 1, 2021 Enter to modify the setting. Press the Refresh button to make sure that the setting was modified properly. • To save the List Mode Variant setting, you must manually edit the INI file. Add the following line above “END #0”... -
Page 26: Acquiring List Mode Data
STJ Quick Start Guide v 2.01 April 1, 2021 discarded. Note that the binary file is stored in the folder selected in the Mapping Data tab of the ProSpect Options dialog, which is accessible under the Tools menu, as shown below. Fig 15: The binary file folder location can be changed in the Mapping Data tab of the ProSpect Options dialog, accessible under the Tools menu ACQUIRING LIST MODE DATA... -
Page 27: Save The Ini File
STJ Quick Start Guide v 2.01 April 1, 2021 SAVE THE INI FILE! At this point you should have all the settings correct. It’s time to save the modified settings to your INI file. • Select File: Save Configuration (or Ctrl+S) to overwrite the current INI file •...
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