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Hitachi

Hitachi High-Technologies Science America, Inc.

Vortex®-ME4 X-ray Detector

General Description

General Description - Vortex®-ME4

Vortex®-ME4 is a four-element silicon drift detector (SDD) X-ray detection system with a total active area of 120 mm2 - 200 mm2.

The Vortex®-ME4 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®-ME4 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®-ME4 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)
  • Available in thickness of 0.5 and 1 mm
  • Large area, four-element silicon drift detector (120 mm2 - 200 mm2)
  • Superb energy resolution
  • Detector temperature stabilization
  • Additional sizes are available under special contracts
  • Small and compact package for minimum vibration
  • Xmap or Mercury 4 - multi element processor

Specifications

Specifications
Name Silicon Drift X-Ray Detector
Type Vortex®-ME4
Overview Vortex®-ME4 is a four-element silicon drift detector (SDD) X-ray detection system feature active areas of up to 200 mm2.
The Vortex®-ME4 offers superior energy resolution and high throughput performance to enhance the total analytical performance of the X-ray spectrometry system.
The Vortex®-ME4 (Model number 267-VTX-ME4) is composed of the following components, which are supplied as a package:
  • Power supply: Model number MMVI-PS-1
  • Detector Cable
  • Power Cable
  • Xmap XIA or Mercury 4, four-channel digital pulse processor (optional)
Component Specifications
  • Detector material: Silicon
  • Detector sensitive thickness: 0.5 mm and 1 mm
  • Detector total active area (for 4SDDs) 120 mm2 - 200 mm2
  • Window material: 12.5 µm thick Beryllium, or ATW (Moxtek MP3)
  • Preamplifiers 1 per SDD for a total of 4):
    • 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 1µs 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 +30oC) using 55Fe: <200ppm/oC
Peak position stability with temperature (+5 to +30 oC) using 55Fe: <20eVat 200kcps ICR

Operating Environment

Operating Environment
Ambient Temperature +5 to +30 oC
Humidity 20 to 80% RH (no condensation)
Operating Position Horizontal, or tilted from 0 – 90o 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): 100V+15%, 115V+15%, 230V+20% single phase Detector power consumption: <40 W Xmap unit power consumption: <20 W

Vortex CUBE Count Rate; XIA Mercury DPP

Vtx QE