Mössbauer Spectrometer

  • Electromagnetic Mössbauer velocity transducer for two gamma-sources
  • Scintillation probes for gamma detection
  • Optional equipment like ovens, cryostat, vacuum system, PC-based MCA
  • Analog electronics in NIM mechanics
  • Duplicated inputs/outputs for two-sided measurement
  • Multifunction Velocity Control Electronics

A complete line of detectors, CAMAC and later PC based NIM electronics for Mössbauer driving and data acquisition system, Mössbauer analysis softwares and accessories have been developed, applied by the Central Research Institute for Physics (KFKI) and are nowadays produced and configured by the KFKI-RegTron Co., Ltd.

The main components of the Mössbauer laboratory are the following:

  • Velocity transducer, simple and combined benches, CAMAC crate, data way and power supply or NIM-BIN, scintillation detector, HV power supply, linear amplifier and differential discriminator or single channel analyzer, velocity driver, PC based data processor and velocity control, vacuum and temperature controller, vacuum system, disc oven, cryostat.
  • NP-255-D or enhanced ND-255-DM Velocity Transducer is used for the precise motion of the gamma source(s). Maximum deflection is ±8 mm. It is mounted either on NM-224 or NP-255-S benches.
  • NM-224 Simple Bench is used to hold the NP-255-D Velocity Transducer, gamma detectors and the absorbents at adjustable distances, horizontally.
  • NP-255-S Combined Bench facilitates the instrumentation, whether at room-, low- or high temperatures, holded the velocity transducer, gamma detectors and absorbers, either horizontally or vertically, the vacuum system, the oven or cryostat.
  • NB-275 CAMAC crate, data way, power supply with monitor
  • NZ-640/2 Velocity Control Driver (a 10-module wide CAMAC unit) connected to PC-MDP, MCA or single channel analyzers, drives the NP-255-D transducer. The required velocity can be adjusted from ±2 mm/s to ±300 mm/s. It generates triangular velocity waveform. The modes of operations: constant velocity, constant acceleration and velocity window.
  • ND-220/M Scintillation Detector is capable of detecting low energy gamma rays in the range of 6 to 120 keV. It can be mounted on either NM-224 or NP-255-S benches and is supplied by NB-257 or M-3102D modules. The output signal has a maximum of 200mV amplitude.
  • NB-257 High Voltage Power Supply (a 3-module wide CAMAC unit) is capable of operating with two scintillation detectors. The HV output can be adjusted by a helipot from 0 to 2kV.
  • NV-261 Double Linear Amplifier (a 3-module wide CAMAC unit) consists of two independent amplifier for shaping signals from scintillation or proportional detectors.
  • NK-226 Double Differential Discriminator (a 2-module wide CAMAC unit) has two independent channels to process the amplified signals. The window width can be regulated by a helipot.
  • NZ-663/1 Digital Temperature Controller has a cascaded control loop. Its resolution is 0.1 °C.
    Note: Types CAMAC are not recommended for new applications
  • M-2000 NIM Bin/Power Supply provides mounting space and power sources for up to 12 standard Nuclear Instrument Modules (NIM). It is equipped with a selection of 115 V AC and 235 V AC (nominal) input power (60/50Hz).
  • M-2015A Spectroscopy grade Amplifier with high count rate restoration. It combines, in one single NIM module, a spectroscopy amplifier with gated baseline restoration and a timing single channel pulse height analyzer. Outputs: SCA and ULD or LLD. Designed for use with scintillation detectors, proportional counters.
  • M-3102D High Voltage Power Supply is a single width NIM module designed for use with photo multiplier and electron multiplier tubes.
  • HV OUTPUT: ±15 to ±2000 V DC, continuously adjustable.
  • (The latter three units, obtained from other manufacturers, are integrated into the Mössbauer system by KFKI-RegTron)
  • NZ-640/PC Velocity Control Driver consists of a plug-in printed circuit board (VCU) for any IBM compatible PC and a single width NIM module (VDU). It drives the NP-255-D/DM transducer.
    Operation mode:  constant acceleration
    Velocity signals:  triangular or sinusoidal
    Velocity range:  ± 2 to 300 mm/s
    Velocity linearity:  0.3% up to 30 mm/s
      1% up to 100 mm/s
  • PC-MDP Mössbauer Data Processor is a full length, single-slot plug-in board for IBM PC compatibles. It turns the professional PC into an integrated data acquisition and processing system equipped with a user-friendly software running under PC-DOS. MDP collects spectral data from the velocity control driver. The host PC acts as a real-time display among others. Single key commands (zoom facilities, data transfer, hard copy) make MDP easy to use.
  • MDEP 2.0 Mössbauer Data Evaluation Program is used for the off-line evaluation of Mössbauer spectra. Measurement data can be loaded from diskette, can be displayed, corrected and stored on disk/diskette. The Mössbauer spectra can be fitted directly by magnetically split six-line spectra and/or quadruple doublets. The hyperfine field or quadruple splitting distribution by several methods (window, binomial distribution, Fourier deconvolution) can be determined.
  • MTC-1000 Digital Temperature Controller maintains the temperature of the NP-255-CF cryostat or the NP-255-DF oven of relatively large time constant, having a cascaded control loop.
  • Range:  70 to 1000 K
    Resolution:  0.1 K
  • Sensors for which calibrations are included:
  • Copper/Constantan thermocouple type T,
    Chrome/Alumel thermocouple type K
  • Cold junction compensation
  • Vacuum System Controller and Power Stage has a dual function. First, it controls the valves and pumps of the NP-255-VA Vacuum System and indicates its actual state. Second it drives the heating element of the oven or cryostat.
  • NP-255-DF Disc Oven can be used in either air, a protective gas or vacuum operation mode, between 300 and 1000 K.
  • NP-255-CF Continuous Flow Cryostat is used to hold the sample, to control and maintain the temperature of sample within wide limits and great accuracy. The temperature of the sample can be 77 to 350 K.