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The Pixie-4 is best operated through XIAs host
control software, the Pixie Viewer.
In the Viewer, users can set all parameters relevant to the data acquisition,
store them in settings files, and run the modules. Results can be displayed
from data files to provide instant feedback on the state of the experiment.
The Pixie Viewer is based on IGOR PRO, distributed
by WaveMetrics. IGOR PRO is a program package for data display, analysis,
and experiment control. It has a rich graphical interface, is documented
well and easy to program. Users can easily add their own data analysis
to the data acquisition software that XIA supplies.
A basic data acquisition system can consist of a 6-slot PXI crate, one Pixie module, a single board host computer, a preamplifier power supply and a high voltage module. The host computer is used to download software and settings to the Pixie module, start and stop runs, read out the data and write it to disk. This is a very compact standalone solution, for example for clover detectors.
Instead of a single board computer residing in the PXI crate, a regular desktop or laptop computer can act as a remote crate controller using a set of adapter cards with a high speed copper or fiber optic data link. Data readout speeds are somewhat lower (80 MByte/s) for remote controllers. For bigger detector arrays, a larger PXI crate (up to 18 slots) can be used.
The preamplifier power supply developed by XIA also includes an external trigger option. This allows the distribution of clocks and triggers between the PXI backplane and external electronics. Besides the system clock, distributed signals can include an external veto, run start synchronization, event triggers and timing signals.
|Inputs||Analog||Four preamplifier inputs, jumper-selectable input impedance:
50 Ohms or 10 kOhm. Not to exceed +/-3.5V if terminated with 50 Ohms and attenuation is not used. Works with common resistive feedback preamplifiers of either signal polarity.
|Digital||(TTL 3.3V) Each module has a single MMCX connector which can be programmed to be used for any of the following functions:
Veto: Logic input for externally timed data collection. Suppresses collection when actively held low.
External Trigger: Logic input for a digital trigger matching the delays in the module.
Status: Logic input adding to the recorded status bit pattern in list mode.
The Pixie-4 connects to the PXI backplane lines, including bussed, nearest neighbor and star trigger lines. All clock, trigger and synchronization signals are distributed over these lines.
A second MMCX connector can be used as output directly from the DSP in custom applications.
|Data I/O||Interface||Compact PCI standard, 33 MHz, 32-bit|
|Data Transfer Rate||Memory readout to host: 109 MB/sec|
|Digital Controls||Gain||Coarse gain from 0.97 to 11.3 in 64 steps
+/-10% digital gain adjustment for channel matching
Pulse amplitudes up to 2V (after termination) at gain=1
Proportionally lower at higher gain
|Offset||DC offset adjustment: -2.5V to +2.5V|
|Trigger||Adjustable trigger filter to suppress noise
Filter length: 0.053 to 0.838 us
Threshold range: 4 to 2000 ADC steps (after filter)
|Filtering||Trapezoidal filter with peaking times 0.08 to 106 us
Adjustable flat top to eliminate ballistic deficit effects
|Pileup||Options to reject (default), ignore, exclusively accept piled up pulses which follow too closely to measure pulse heights individually|
|Coincidence||Programmable coincidence window: 50 ns to 871 us
Reject unwanted hit patterns of the 4 channels
|Data collection||MCA limits and number of bins
Waveform lengths and pre-trigger delay
|Data Outputs||MCA||1024 to 32,768 channels (32 bits deep) per Pixie channel|
|List Mode||Time stamp, energy, optional waveforms for each event stored in 128K (32-bit) word buffer.|
|Timing||Events are time stamped with 75MHz clock in list mode.|
|Statistics||Livetime, runtime, input rate, output rate, filter dead time|
|Diagnostics||ADC trace, baseline distribution, baseline history, FFT noise spectrum|
XIA Home > Products > DGF Products > DGF Pixie-4
http://www.xia.com/DGF_Pixie-4.html, last updated
November 30, 2017