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R7780

CAEN Shift Register Multiplicity and Time Recorder

Datasheet

Home Modular Pulse Processing ElectronicsRead Out SystemsNeutron Detection R7780

Photo of R7780
  • 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 Shift Register readout software

  • Compliant to INCC software package

  • Fully remotely controllable by Web Interface

  • 19” rack mount capability

The CAEN Mod.R7780 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


Ordering Options

Code Description
WR7780AXAAAA

R7780A – CAEN Shift Register Multiplicity and Time Recorder

RoHS
WR7780XAAAAA

R7780 – CAEN Shift Register Multiplicity and Time Recorder (UDL1)

RoHS
WR7780XXAAAA

R7780X – CAEN Shift Register Multiplicity and Time Recorder

(Discontinued)

RoHS

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    Technical Specifications

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    Mechanical

    Form Factor: 1U width, 265mm depth compatible with 19” rack
    Weight: 2400 g

    Connectors

    Inputs 

    • 8 signal inputs

    • Single-ended TTL (Zin = 50 Ω)

    • LEMO 00 female socket 

    • Internal 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 receptacle 

    SD1, SD2 

    Memory slot for SD card 

    EXT 

    OTG USB2.0 port for USB stick
    Type-A socket 

    HDMI 

    Video monitoring output
    Type-A HDMI socket 

    USB 

    USB-2.0 port
    Type-B socket 

    ETHERNET 

    GbE port
    RJ45 shielded jack 

    Power 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%
    • Operating Humidity: up to 93% RH non condensing
    • Storage Humidity: up to 93% RH non condensing
    • Altitude: < 2000m
    • Pollution Degree: 2
    • Overvoltage Category: II
    • EMC Environment: Commercial and Light Industrial
    • IP Degree: IPX= Enclosure, not for wet location

    Regulatory Compliance

    EMC: CE 2014/30/EU Electromagnetic compatibility Directive
    Safety: CE 2014/35/EU Low Voltage Directive

    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 @500 μA, SBC on, fan on, USB stick in, 2 SD cards in, Ethernet link active)

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