R7780
Unattended Data Acquisition Module for Unattended Monitoring Systems (UMS)
Features
- Neutron Coincidence Analyzer and Multiplicity module combining the Shift Register and Pulse Train Recorder functions
- Neutron counting capability on multiple detectors
- Dedicated to Nuclear Safeguards and nuclear material process monitoring in its life cycle
- Up to 512-channel histogram of multiplicity data (Real+Accidentals and Accidentals)
- Time-stamped lists saved to PTR-32 compatible file format
- Unattended operation with data logging capability (two removable SD cards and USB stick)
- Redundant storing mechanism implemented for higher reliability in unattended operation
- Minimum pulse width detection of 10 ns
- Pulse pair resolution: 10 ns + pulse width
- 8 inputs on LEMO connectors (TTL, 50 Ω) with independent counting capability
- Special video output (HDMI) to externally monitor the state-of-health of the device
- Single high-power high-voltage supply output (+2000 V @ 500 μA)
- Two high-power low-voltage outputs (+5V / +12V @ 1 A)
- 1 GbE and USB-2.0 interfaces
- Fully controlled by CAEN ShiftRegister readout software
- Compliant to INCC software package
- Fully remotely controllable by Web Interface
- 19” rack mount capability
Overview
The R7780 device manages the acquisition and analysis over up to 8 neutron detectors that can work in unattended mode. Mechanics are compliant to 19” racks, and it can be operated also as stand-alone.
This is a Neutron Coincidence Analyzer and Multiplicity module combining the functions of a Shift Register and a Pulse Train Recorder. The eight single-ended TTL inputs (LEMO) feature independent counting capability. Moreover, adjustable input thresholds give the possibility to compensate TTL signal voltage drops in case of long-distance use.
The internal 100MHz sampling clock fits for high count-rate applications and the on-board intelligence synergy of a FPGA and a Single Board Computer (an ARM CPU running Linux) makes it possible to provide time-stamped lists and the overall neutron counting information (coincidence timing, multiplicity distributions of coincident events, etc.) required for the analysis in Nuclear Safeguards and nuclear material process monitoring.
After the start-up sequence based on a programmable configuration file, the device can collect data without external control on a local non-volatile memory. Two SD cards, externally accessible for insertion/extraction, store all measurement results and log information in two identical copies for redundancy reasons. The presence of a OTG USB port allows the automatic data retrieval by a USB stick.
The device can also operate in attended mode controlled by an external host computer using the USB port as virtual point-to-point serial connection (reserved for INCC software(1)) and a remote network connection through the ethernet port.
The R7780 is equipped with a video output (HDMI) to connect an external display for monitoring the state of the device and acquisition information.
High power outputs are available as well: one high-voltage channel for the detector biasing and two different low-voltage channels (+5V and +12V) to power the front-end electronics such as preamplifiers and discriminators.
The R7780 is fully supported by CAEN ShiftRegister control software which configures the device and handles the data acquisition. In attended mode, the raw data can be saved to binary files on the host computer for offline analysis (supported PTR-32 format compatible with the INCC software). Complete device control, including firmware upgrade, is also possible by Web Interface.
(1) INCC Software Users Manual: http://lib-www.lanl.gov/la-pubs/00326587.pdf
Technical Specifications
- PHYSICAL
From Factor 1U width, 265mm depth
compatible with 19” rackWeight 2400 g
- CONNECTORS
Inputs 8 signal inputs
Single-ended TTL (Zin = 50 Ω)
LEMO 00 female socketInternal fast comparator with a software-programmable TTL threshold (from 0.1 V to 4.3 V with a resolution of 0.01 V) common to each group of 4 channels to compensate for cable length signal attenuation
HV High Voltage output
SHV plug+5V, +12V
Low voltage outputs
BNC jack receptacleSD1, SD2
Memory slot for SD card
EXT
OTG USB2.0 port for USB stick
Type-A socketHDMI Video monitoring output
Type-A HDMI socketUSB
USB-2.0 port
Type-B socketETHERNET
GbE port
RJ45 shielded jackPower In
9-36V DC rack power input
- MINIMUM PULSE WIDTH
10 ns
- PULSE PAIR RESOLUTION
Pulse width + 10 ns
- HVPS OUTPUT
Single channel for the detector power supply:
- Output Bias Voltage (Vset) = 0 to + 2000 V
- Vset Resolution = 1 V
- Vmon Resolution = 1 V
- Vout/Vset (Vout > 200 V) Accuracy = 1.5%
- Vout/Vmon (Vout > 200 V) Accuracy = 1.5%
- Ramp‐Up/Ramp‐Down = 1 to 500 V/s in steps of 1V
- Maximum Output Bias Current (Iset) = 500μA
- Imon Resolution = 1 μA
- Imax_out/Iset (Vout > 500 V) Accuracy = 3%
- Iout/Imon (Vout > 500 V) Accuracy = 3%
- LOW VOLTAGE OUTPUTS
Two channels for the preamplifier power supply:
- +5 V @ 1 A
- +12 V @ 1 A
- ON‐BOARD CPU
SBC ARM Cortex‐A9 quad core @ 1 GHz running Linux®
FPGA Cyclone V GX
- OPERATING MODES
- UNATTENDED: After the start‐up sequence, all data are logged on‐board without external intervention
- ATTENDED: The device works under full control of an external PC (INCC software compliance) transmitting raw data for further analysis; time‐stamped lists are saved to binary files compatible with PTR‐32 format
- LIST: Like the attended mode, but raw data are saved on the SD cards to PTR‐32 files under the user external control
- DATA LOGGING ON SD CARD
- Local storage on non-volatile memory of log files and analysis results (Coincidence and Multiplicity data) in unattended mode, while log files and raw data (time-stamped pulses) in list mode
- Two removable 32GB SD cards replicate same folder structure and contains same data for redundancy reasons to prevent from non-volatile memory device failures
- LED indicators inform on the SD card state
- Attaching a USB stick to the OTG USB port activates the fully automatic copy of all data from non-volatile memory; a LED indicator shows the state of the process
- PROGRAMMABLE PARAMETERS
- Gate width from 10 ns to 1.3 ms in steps of 10 ns
- Pre-delay: from 0 to 100 μs in steps of 10 ns
- Long delay (the delay between the Reals+Accidentals gate and the Accidentals gate) from 0 to 5 ms in steps of 1 μs
- Measurement time between 0.1 s and 43600 s (12 h)
- Reals+Accidentals and Accidentals on 64-bit counters
- Number of multiplicity bins for Accidentals and Reals+Accidentas up to 512 (32 bits per each bin)
- SYSTEM PERFORMANCES
- Internal clock = 100 MHz
- Timestamp resolution = 10 ns
- Pulse pair resolution = pulse width + 10 ns
- Maximum rate in coincidence/multiplicity mode = 7 Mcps (measured at constant rate)
- Maximum rate in counting mode = 16.6 Mcps (measured at constant rate)
- COMMUNICATION INTERFACES
Ethernet - 1 Gbit Ethernet,
- 1000Base-T
- Configuration, operation, and data taking in attended mode
USB - USB 2.0 version
- Virtual COM port reserved for local communication through the INCC software protocol with a Windows-based computer
- Configuration, operation and data taking in attended mode
- SOFTWARE
- Windows® and Linux® support
- CAEN Shift Register control software
- Compatibility with INCC software
- Web Interface (Board information retrieval and configuration, files management, data readout, firmware upgrade)
- ENVIRONMENTAL
- Operating temperature: -10°C to +55°C
- Storage temperature: -10°C to +85°C
- Operating humidity: up to 93%
- Storage humidity: up to 93%
- POWER REQUIREMENTS
Integrated primary power supply unit 9-36V DC:
- 1 A @ 28 V
- 1.17 A @ 24 V
- 2.4 A @ 12 V
- 3.22 A @ 9 V
Measured in full load conditions (12V and 5V preamplifier outputs on 1A, HVPS output on 2kV@500μA, SBC on, fan on, USB stick in, 2 SD cards in, Ethernet link active)

- Documentation
- Software
- Firmware
Manuals
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Ordering Options
Code | Description |
---|---|
WR7780XXAAAA | R7780X - CAEN Shift Register Multiplicity and Time Recorder RoHS |