Large Scanning TCT System
Large Scanning-TCT aims for the same applications as Scanning TCT. The main difference with respect to the latter is the vertical placement of the optical system and larger and more robust stages that can carry heavy load.
The mounting surface is cooled by a combination of several Peltier elements with the combined power of 200W. The mounting plane is much larger and allows also for wider range of movements. Performance wise the properties of both systems are similar.
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.
Technical Specifications
Component |
Parameter |
Properties |
|---|---|---|
Laser |
Laser diode | |
| Wavelength | 660 nm or 1064 nm (optional others on demand) | |
| Pulse power | Few M.I.P. – 100 M.I.P. (equivalent in 300 micron Si) | |
| Pulse width | <350 ps – 4000 ps (tunable) | |
| Coupling | Single core fibre | |
Driver |
Control | With PC over USB |
| Running mode | Single pulse: 50 Hz – 1 MHz | |
| Pattern mode | mHz to 100 kHz | |
| Sequence | 1024 bits deep sequence of pulses | |
| Minimum distance between pulses | 440 ns | |
| External control | External NIM logical signal | |
| I/O | Ext. trigger in / Trigger out MC / Trigger out laser | |
Optics |
Beam spot (FWHM) | <11 μm @1064 nm, <8 μm @660 nm |
| Coupling | Fibre coupled | |
| Attenuation | Through collimator on beam-expander | |
Mechanics |
Experimental box | 78 × 60 × 60 cm (H × W × L) |
| Translation | 3-axis computer controlled | |
| Load / stage | 50 kg | |
| Moving range | 10 × 10 × 10 cm (X, Y, Z) | |
| Position resolution | <1 μm | |
| Control | Via USB | |
Electronics |
Amplifier | 53 dB |
| Bias-T range | >1000 V | |
| Frequency range | <0.3 MHz – >3000 MHz | |
Mounting table |
Cooling type | Peltier element |
| Heat remover | Water / inlets provided | |
| Cooling power | 200 W (4 × 50 W) – ΔT >40 °C | |
| Test sample box | 2.5 × 3 cm² – testing box | |
| Mounting plane | 20 × 20 cm² | |
Software |
Full DAQ | Adaptation for specific oscilloscope, power source on demand |
| Analysis software | ROOT based package |