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Hitachi

Hitachi High Technologies in America

Vortex®-ME7 Silicon Drift X-ray Detector

General Description

General Description—ME7 Silicon Drift Detector (SDD)

Vortex®-ME7 is a seven-element silicon drift detector (SDD) X-ray detection system with a total active area of 210 mm2 - 350 mm2 design with a probe diameter of only 1.5" (38.1 mm).

The Vortex®-ME7 offers superior energy resolution and high-throughput performance to enhance the total analytical performance of the X-ray spectrometry system.

Typical Applications

  • X-ray fluorescence (XRF) spectroscopy, both bulk- and micro-fluorescence
  • Synchrotron radiation applications
  • Process control
  • Fast X-ray mapping

The Vortex®-ME7 SDD is operated at near room temperature and cooled by a thermoelectric cooler (TEC), and can be cycled as frequently as needed without any degradation in detector performance. Cool-down times are typically less than 3 minutes.

The Vortex®-ME7 X-ray spectroscopy systems include a detector unit and control box which includes power supplies for the detector, TEC, and an optional digital pulse processor.

The complete detector also contains charge-sensitive preamplifiers and temperature-stabilization system, which eliminates concerns of varying ambient temperature.

Features

  • Extended probe (300 mm - 600 mm)
  • Large-area, seven-element silicon drift detector (210 mm2 - 350 mm2)
  • Superb energy resolution
  • Detector temperature stabilization
  • Additional sizes available under special contracts
  • Small and compact package for minimum vibration
  • XMap, Mercury 4, or advanced DXP such as Xspress3 or Falcon X multi element processor
  • Equipped with an ion pump
  • RoHS
  • Probe diameter: 1.5" (38.1 mm)
  • Excellent resolution (Mn Kα) at ultra-high count rates

    Resolution vs. Output Count Rate for Vortex® SDD sensors
    Resolution vs. Output Count Rate for Vortex® SDD sensors

  • Exceptional throughput

    Throughput (OCR vs ICR) for Vortex® SDD sensors
    Throughput (OCR vs ICR) for Vortex® SDD sensors

  • Quantum Efficiency of Vortex® SDD sensors and X-ray transmission of Be Windows

    Quantum Efficiency for Vortex® SDD sensors and X-ray transmission for Be x-ray windows
    Quantum Efficiency for Vortex® SDD sensors and
    X-ray transmission for Be x-ray windows

Specifications

Name Silicon Drift X-Ray Detector
Type Vortex®-ME7
Overview
  • Vortex®-ME7 is a seven-element silicon drift detector (SDD) X-ray detection system featuring active areas of up to 350 mm2.
  • Vortex®-ME7 offers superior energy resolution and high-throughput performance to enhance the total analytical performance of the X-ray spectrometry system.
  • Vortex®-ME7 is composed of the following components, which are supplied as a package:
    • Power supply: Model number MMVI-PS-1
    • Detector cable
    • Power cable
    • XMap, Mercury 4, or advanced DXP such as Xspress3 or Falcon X multi element processor (optional)
Component Specifications
  • Detector material: Silicon
  • Detector sensitive thickness: 0.5 mm
  • Detector total active area (for 7 SDDs) 210 mm2 - 350 mm2
  • Window material: 12.5 or 25 µm thick Beryllium
  • Preamplifiers 1 per SDD for a total of 7:
    • Type: Charge sensitive
    • Gain: 1.5 mV/keV +/-10%
    • Signal polarity: Positive
    • Reset: Electrical, synchronized for all channels, <1 µs duration
  • Cooling: Air cooling. Sufficient airflow needed. Do not obstruct cooling fan vent.
Spectrometer Performance (each channel) using the Xmap Energy resolution using 55Fe isotope:
FWHM(eV) at 5.9 keV
Peaking Time 1 µs, Typical <145 eV Maximum 155 eV
Peaking Time 0.5 µs, Typical < 150 eV Maximum 170 eV
Peaking Time 0.25 µs Typical < 165 eV Maximum 185 eV
Peaking Time 0.1 µs Typical < 220 eV Maximum 260 eV
Output count rate (OCR) of each channel at 50% dead time, with optimum pileup rejection performance, measured with X-ray tube excitation of a Mn sample
Peaking Time: 1 µs 0.5 µs 0.25 µs 0.1 µs
OCR(kcps) per Channel: >130 >250 >400 >700
Peak-to-background ratio (peak count at 5.9 keV divided by average counts between 1.6 keV and 3.2 keV background using 55Fe): >1000:1 at 1 µs peaking time
Counting efficiency stability for 8 hours using 55Fe isotope: < +/-0.5% rms Counting efficiency stability with temperature (+5 to +30 °C) using 55Fe: < 200 ppm/°C
Peak position stability with temperature (+5 to +30 °C) using 55Fe: < 20 eVat 200 kcps ICR

Operating Environment

Ambient Temperature +5 to +30 °C
Humidity 20 to 80% RH (no condensation)
Operating Position Horizontal, or tilted from 0 – 90° with the detector end pointing down
Physical Specifications Weight: 4.3kg
Length × Height × Width: 425 mm × 165 mm 82 mm
Standard cable length: 3 m
4-channel digital pulse processor (Xmap from XIA) Digitization: 14 bit, 50 MHz Gain: 16 bit, Gain DAC control Peaking Time: 0.1 – 100 µs Pileup rejection: Pulse pair resolution (PPR) better than 100ns ROIs: Up to 32 ROIs can be defined Timing: Multiple spectra, or ROIs can be stored with continuous operation using dual memory bank configuration. Integral non- linearity: <= 0.1% over the full scale output range
Data output Spectrum size: 1024, 2048, 4096, 8192
Channel size: 10 eV
Software xManager (from XIA)
Power Requirement and Consumption Inlet line voltage (Inlet key selectable): 100 V+15%, 115 V+15%, 230 V+20% single phase
Detector power consumption: < 40 W
Xmap unit power consumption: < 20 W
Ion Pump Requires power, when the system is OFF or in storage, to maintain vacuum.