The Neutron Separation, Timing and Spectroscopy System

The Neutron Separation, Timing And Spectroscopy System

Required Equipment

• Liquid Scintillator NE-213 Detector
• PMT Bias
• Preamplifier Model 3001
• Bin Power Supply Model 8000
• High Voltage Power Supply Model 8100
• Preamplifier Model 3001
• Delay Line Amplifier (DLA)
• Timing Single Channel Analyzer(TSCA)-2575
• Analog-to-Digital Converter Model 4010 (ADC)
• Gate & Delay Generator
• Constant Fraction Discriminator(CFD)
• Multi-Parameter Analyzer
• BNC and SHV Cables

This set is described in the following figure.

 

All products are provided by Iman Gostar Raman Kish company.

 

Instruments Used In Spectroscopy System 

1.Liquid Scintillator NE-213

The NE-213 is an organic liquid scintillator detector with excellent efficiency and quality for neutron-gamma separation and is well known and used in neutron-gamma separation experiments. This detector is currently being manufactured at different sizes and with suitable PMTs for the bias.

 

2. PMT Base

A photomultiplier tube (PMT) consists of a photosensitive cathode, several dynodes and a collection anode. The dynodes are responsible for the increase in signal by electron multiplication. Detection signals and also the feeding of PMT require a base. At present, it is possible to produce various types of bases for different applications at Iman Gostar Ramman Kish Company.

 

3. BIN Power Supply Model 8000

The 8000 power supply is a 19 inch rack with a power supply of 160 watts, and all of its connectors have the standard voltage of a NIM bin.

Specifications

• Input: 220 or 115 Vac,
• Output impedance: at any frequency up to 100 KHZ for the dc output.
• Temperature coefficient: < 0.02%/°C, 0 to 60 °C
• Output ripple: < 3 mV
• Voltage adjustment: ±2% minimum range

 

4. High Voltage Power Supply Model 8100

The  8100 high voltage power supply is used for biasing various detectors.

Specifications

• Output polarity: positive or negative
• Output voltage: 0 to 5 KV
• Output current: 0- 10 mA
• Output ripple: < 10 mV
• Regulation: < 0.0025%
• Power: 220 Vac

 

5. Preamplifier Model 3001

The IAP 3001 scintillation preamplifier is an all-transistor preamplifier designed for use with photomultiplier tubes. It is non inverting preamplifier with no provisions for pulse shaping excepts the variation of fall time. A diode network prevents destruction of the input transistor if a sudden positive or negative high voltage is applied to the input.

Specification

Rise time: < 60 ns

Fall time: fall time constant is designed for 50 μs , assuming a signal source impedance of MΩ.

• Internal nonlinearity: ≤ 0.02%
•  Power required: +24 Vdc, 17mA; -24Vdc, 17mA; supplied from any IAP  transistor main amplifier or an IAP preamplifier power supply through 10-ft captive cable.
• Input: BNC connector; isolated for 1000 V; positive or negative polarity, 1 MΩ impedance shunted by 45 pF plus the capacity selected by jumper S1 (0,100, 200, 500, or 1000 pF).
• Test pulse: BNC connector; accepts a pulse generator output with fast rise and slow decay to check operation of the electronics; input impedance

 

6. Delay Line Amplifier (DLA)

DLA is intended for energy and time spectroscopy with scintillation detectors. Its delay-line shaped output signal is particularly suitable for timing and high-counting rate applications. This output signal offers a more rapid baseline recovery than is possible with Semi-Gaussian shaping amplifiers.

Specifications

• Gain range: from 10 to 1000
• Shaping filter: front-panel switch permits selection of integration time constant with 0.04, 0.1 or 0.25 μs

• Integral nonlinear: less than ± 0.05%
• Temperature ability: gain ≤ ± 0.01% / ° C, 0 to 50 ° C and DC level ≤ ± 0.1 mV / ° C, 0 to 50 ° C

 

7. Timing Single Channel Analyzer (TSCA)

The TSCA device is used as a single-channel analyzer (SCA) or a discriminator. Its main output is a fast negative signal and a slow positive pulse. Two separate outputs are considered for low and high level analyzers in this device.

Specifications

• Dynamic range: 1-200
• Pulse pair resolving time: minimum pulse-pair resolving time for negative and positive output is 200 ns.
• Temperature instability: less than ± 0.01 %/° C
• Discriminator nonlinear: less than ± 0.25%
• Delay temperature instability: less than ± 0.03 %/°C
• Delay nonlinear: less than ±2 %

 

8. Analog-to-Digital Converter Model 4010 (ADC)

The IAP model 4010 ADC is a high resolution Wilkinson type analog to digital converter with 13 bit conversion range.

Specification

• Accepts signal: positive or bipolar pulses (positive portion leading).
• Input range: 25 mV to 10 V.
• Input impedance: 1000 Ω.
• Rise time: 100 ns to 100 μs.
• Fall time: 200 ns to 100 μs.
• Width: 0.5 μs minimum.

 

9. Constant Fraction Discriminator (CFD)

A constant fraction discriminator (CFD) allows good time resolution to be obtained from all detectors.

Specifications

• Count rate: 100 MHz
• Dynamic range: 1- 1000
• Five modes of operation
• Two negative outputs and two positive outputs, simultaneously
• Multi-color counting rate display
• Dc collapse

 

10. Cables

• SHV and BNC

 

Long Term Warranty And After Sales Service