Configurable Multi-Tap and Multi-Range Precision Digital Quench Detection System (QDS) for Superconducting magnet protection applications with 10/100/1000 Mbit Ethernet connectivity
The QDS (“Quench Detection System”) is the new solution for any type of quench detection on superconducting magnets. It is composed by 4 independent channels, each one floating up to 100 V, that can be connected to voltage taps. The quench detection can be performed both in an absolute or differential way and the detection window can be configured from 1 ms to 1 s.
Each channel has eleven (11) different full-scale ranges, the largest one up to ±20 V (2.4 uV resolution) and the smallest one up to ±20 mV (2.5 nV resolution). The range of each channel can be set independently.
Each channel can float up to 100 V from ground and it is fed to a signal conditioning network that converts it with a 24-bit resolution and a 100-kHz sampling rate.
Interlock signals as well as output status signals are available for different uses – e.g. interfacing to a power supply for the superconducting magnet.
The embedded FPGA can perform quench detection over different-scaled time windows (from 1 ms to 1 s).
A 10/100/1000 Mbit Ethernet connection (TCP-IP or UDP) allows for very fast data transmission and easy instrument control with several operating systems and programming languages. The internal firmware can be remotely updated, please check our website www.caenels.com in order to have the last available version installed on your QDS device.
A software application is provided with the QDS unit: the configuration of different time windows as well as absolute and relative quench thresholds can be set straighforward.
Two power outputs, one rated at 12 V and the other one at 24 V, can be used to drive a Persistent Switch.
Input Channel Type
Floating - up to 100 V
Voltage Measuring Range
RNG0: ±20 V
RNG1: ±10 V
RNG2: ±5 V
RNG3: ±2.5 V
RNG4: ±1.25 V
RNG5: ±625 mV
RNG6: ±312.5 mV
RNG7: ±156.25 mV
RNG8: ±78.125 mV
RNG9: ±39.0625 mV
RNG10: ±19.53125 mV
Voltage Resolution (LSB)
RNG0: 2.4 uV
RNG10: 2.5 nV
Internal Sampling Frequency
Integration Time (T)
from 1 ms to 1 s
Equivalent Input Bandwidth
(T =10 ms) 45 Hz
(T =50 ms) 9 Hz
(T =100 ms) 5 Hz
(T =500 ms) 1 Hz
(T =1 s) 0.55 Hz
Temperature Coeffi cient
Ethernet 10/100/1000 TCP-IP or UDP
Internal Processing Unit
FPGA and soft-processor
2 x External Interlocks
12-V and 24-V persistent switch power
Twin (“Twinax”) BNC
(mating: Weidmueller 1277900000)
Firmware Remote Upgrade
Confi gurable Integration Time
Confi gurable absolute and differential quench thresholds
174 x 175 x 44 mm
< 850 g
4-channel Quench Detection System with Persistent Switch Heater – Ethernet-controlled
Last reviewed: 2023-02-09 ⓘ More infoRevision: 0.4
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