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 PresentationTRANSCRIPT
Nuclear Instrumentation
CEU 2014 Waikoloa Resort Hawaii
Nuclear Instrumentation & Signal Processing
Mohammad W. Ahmed
TUNL REU Lecture
What is all this mess ?
Closer Look
Seems to be some organization in this mess
Instrumentation
InstrumentationDetectors
Electronic Modules
Computers
Instrumentation
Signal Processing & Logic
Event Reconstruction
Signal
10010011010010111
Interaction Picture
Signal
Signal Processing
Event Reconstruction
Positive
TTLNIM
LongShortNegative
Bi-polarDC
ECL
• 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
Gamma-Ray of 1.46 MeV Gamma-Ray of 2.61 MeV
V
T
V
T
VV
V
Example 1
Cou
nts
Energy (MeV)1.46 2.61
Energy = Constant X V Acquiring the Constant is calledEnergy calibration
d1
d2
Example 2
d0
T
Time-of-Flight (TOF) is differnt
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
Making Copies
Passive Splitting Active Splitting
Simple “T”
ElectronicModule
Linear/LogicFan In/Out
Linear Fan In/Out Modules
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
Logic Modules
Gain
INCG
FG
T
Out
Spectroscopy Amplifier “SpecAmp”
Amplifiers
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
Coincidence
IN
Outputs
ABCD
Logic InputsLogic Output
Coincidence Unit
Analog to Digital Convt (ADC) / DAC
0110010100111101ADC
0110010100111101
(to computer)(From device)
(From computer)DAC
(To device)
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 !!!
Logic Gate
ADC
Linear Inputs
ADC
• Scalers;•Gate & Delay Generators;•Pulse Generators;•Filters;•High Voltage Generators;•Level Adaptors• etc.
Fan IN/OUT, Disc., Amplifiers, etc
ADCs, TDC, Scalers, etc
BNC “T” BNC Term.LEMO “T” LEMO Term.
BNC Barrel BNC to LEMOLEMO Barrel
Where are all the cables and connectors in the Control Room ?
Acquire and process data
DAQ and Analyzer
DAQ is responsible of taking data from the electronics