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Nuclear Instrumentation

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Nuclear Instrumentation. CEU 2014 Waikoloa Resort Hawaii. Nuclear Instrumentation & Signal Processing. TUNL REU Lecture. Mohammad W. Ahmed. What is all this mess ?. Closer Look. Seems to be some organization in this mess. Interaction. Instrumentation. Analysis/Results. Interaction. - PowerPoint PPT Presentation

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Page 1: Nuclear Instrumentation

Nuclear Instrumentation

Page 2: Nuclear Instrumentation

CEU 2014 Waikoloa Resort Hawaii

Page 3: Nuclear Instrumentation

Nuclear Instrumentation & Signal Processing

Mohammad W. Ahmed

TUNL REU Lecture

What is all this mess ?

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Closer Look

Seems to be some organization in this mess

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Instrumentation

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InstrumentationDetectors

Electronic Modules

Computers

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Instrumentation

Signal Processing & Logic

Event Reconstruction

Signal

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10010011010010111

Interaction Picture

Signal

Signal Processing

Event Reconstruction

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Positive

TTLNIM

LongShortNegative

Bi-polarDC

ECL

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• Amplitudes (Pulse Height = Peak Voltage);• Time (Duration = dt, Start time, t0; • Charge Q

iR + Q/C = Vo

dQ/dT + Q/RC = Qo/RC

Q = (V0/R e – t/RC) t

Page 13: Nuclear Instrumentation

Gamma-Ray of 1.46 MeV Gamma-Ray of 2.61 MeV

V

T

V

T

VV

V

Example 1

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Cou

nts

Energy (MeV)1.46 2.61

Energy = Constant X V Acquiring the Constant is calledEnergy calibration

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d1

d2

Example 2

d0

T

Time-of-Flight (TOF) is differnt

Page 16: Nuclear Instrumentation

Example 3 Pulse Shape

Gamma-Ray neutron

Start Time is the same, Amplitude is also same

Charge (Q) is different (Pulse Shape Discrimination PSD)

T

V

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Making Copies

Passive Splitting Active Splitting

Simple “T”

ElectronicModule

Linear/LogicFan In/Out

Page 18: Nuclear Instrumentation

Linear Fan In/Out Modules

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Logic Creation (Yes/No)

Presence of a signal

Define the condition for a signal to be valid

e.g., If the absolute amplitude is greater than 0.5 V than the signal is good

= - 0.5 V

Test Result

YES !

INOut

YES NO

Discriminator

the

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Logic Modules

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Gain

INCG

FG

T

Out

Spectroscopy Amplifier “SpecAmp”

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Amplifiers

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Coincidence

Did the two gamma-rays originate from the same source at the same time ?

A B

A

B

A+B

A

B

FalseTrue

A+B

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Coincidence

IN

Outputs

ABCD

Logic InputsLogic Output

Coincidence Unit

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Analog to Digital Convt (ADC) / DAC

0110010100111101ADC

0110010100111101

(to computer)(From device)

(From computer)DAC

(To device)

Page 26: Nuclear Instrumentation

ADC

Mask the signal by Bits

0 bit

8 bit

Amplitude (0 to 10 V) is ranged from 0 to 8192 ADC Counts(for the case of 13 bits)

0 bit

13 bit

More bits means better resolution !!!

Page 27: Nuclear Instrumentation

Logic Gate

ADC

Linear Inputs

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ADC

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• Scalers;•Gate & Delay Generators;•Pulse Generators;•Filters;•High Voltage Generators;•Level Adaptors• etc.

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Fan IN/OUT, Disc., Amplifiers, etc

ADCs, TDC, Scalers, etc

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BNC “T” BNC Term.LEMO “T” LEMO Term.

BNC Barrel BNC to LEMOLEMO Barrel

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Where are all the cables and connectors in the Control Room ?

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Acquire and process data

DAQ and Analyzer

DAQ is responsible of taking data from the electronics

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