Scanning TCT System

 

Particulars Scanning TCT System is a complete setup for measurements of transient currents generated in semiconductor sensors with narrow laser beam. It can be used for standard and Edge-TCT measurements. Edge-TCT enables measurements of charge collection and carrier velocity profiles – crucial for understanding the performance of heavily irradiated detectors.

SCANNING-TCT-SYSTEM

Features

  • Wide band current amplifier
  • Bias-T
  • High voltage low pass filter
  • Laser diode (650 nm, 1064 nm)
  • Programmable laser driver for sub-nanosecond laser pulses
  • Laser beam optics, beam spot 8 μm FWHM
  • XYZ moving stages for precise DUT positioning in the beam and focus tuning
  • Water cooled Peltier mounting block for DUT temperature control 
  • Aluminium closure for light and RF shielding and atmosphere control 
  • Dimensions: 80x40x40 cm
  • Weight: 20 kg
  • Hardware control software (connection via USB)
  • Data acquisition software
  • ROOT based package for data analysis

 

Scanning-TCT-amplifier

Amplifier

• Bandwidth 0.01 - 2000 MHz
• Bias 6 - 15 V
• Amplification 35 dB or 53 dB
• Input, output impedance: 50 Ω
• Dimensions: 7x5x1.5 cm3

Scanning-TCT-biast

Bias-T

• Max voltage 1 kV
• Freq. range: 0.01 - 2000 MHz
• Input, output impedance: 50 Ω
• Dimensions: 7x5x1.5 cm3

Scanning-TCT-HVlowpassfilter

HV Low-pass filter

• Filter high frequency
  interferences from HV power
  supplies
• Max voltage 2 kV

Fibre coupled laser with optics on translation stage

• Laser diode 660 nm or 1064 nm 

Scanning-TCT-fiber• Tunable pulse width 0.4 ns - 4 ns

• Tunable pulse power equivalent to 10 MIP - 100 MIP in Si

• Single pulse mode 50 Hz to 1 MHz

• 1024 bits deep pulse sequence

• NIM logic trigger output

• NIM external trigger

• USB control

 

Sample mounting

• Aluminium support block on XY translation stage:
< 1 μm precision, 2 kg load, 5 cm range
• Block fixed to water cooled Peltier element
(40 W, ΔT ~ 40 °C)
• PT100 for temperature measurement

Scanning-TCT-sample-mounting

 

Software

Executables with GUI for complete measurement

control: Laser control, stage movement, data
acquisition
ROOT based package for analysis of TCT signals

Scanning-TCT-software