How to collect data

Japan Atomic Energy Agency
Hiroyuki Makii

What is a data collection device?
→ A device that selects and records the necessary information from thesignals output from the detector A device that selects and records thenecessary information
In this exercise, in addition to the elastic scattering monitor installed in thetarget scattering tank , installed at the focus of the JAEA-RMS,
MCP detector• Si Strip detector
The information necessary to identify what nuclei (isotopes) and how manyof them were formed by the evaporated residual nuclei that flew byprocessing the analog signal from the I will record the information needed
to determine what kind of nuclei (isotopes) were created by theevaporated residuals.
Let us consider what information is actually needed.

What information do you need for thisexercise?
Systematics of alpha decay (from Ricardo's data)
Energy of emitted alpha particles
Elapsed time until emitted
From this information, it is possible to280Rg

260Sg

estimate what nuclides (isotopes) wereproduced in the reaction.
The energy and time information of the alphaAs indicated in the previous lecture, there isparticles emitted by the residual nuclei anda correlation between the energy and half-life their daughter nuclei separated by theof the emitted α-particles, which we would
JAEA-RMS are recorded to find out what kindlike to exploit.

and how many nuclei were produced.

JAEA-RMS
Residual nuclei produced in the reaction being separated by JAEA-RMS
Residual nucleus
Carbon Reset Foil

Slit 0 ~ 200㎜

Beam0 ~ 200㎜

Data concentrator

Target
Q1,2

Electric Magnetic Electricfield ED1 field MD field ED2

Elastic scattering monitor

Q3,4EnergyTime

MCP Detector

Residual nucleus

Si Strip detector

Data Acquisition Equipment - Appearance
Data concentrator
Oscilloscope

Si Strip detector

INMCPCI

Elastic scattering monitor

OUTOUT

OUTWaveform monitor output

Focus Detector - "Striking Event"
MCP Detector + Si Strip detector

Observing the signal output with an oscilloscope...

Evaporation Residual nuclei

MCPDetectors

Si Stripdetector

Signal voltage

MCP

Si StripTime

Actual waveforms may be seen at the time of measurement...

Focus Detector - "Alpha Decay Event"
MCP Detector + Si Strip detector

信号出力をオシロスコープで観察すると…
MCP

Alpha decay

MCPDetectors

Si Stripdetector

Signal voltage(No output)

Si StripTime

Data Acquisition Equipment - Signal Processing(Input)
For MCP detector (just need to know if there is a signal...)Input analog signals, Convert to digital data↓

MCP (Analog signal)

The input voltage is measured every

Signal voltage

1 nanosecond and stored in memory.
※ 1 nanosecond: one billionth of a second↓
Processes analog circuits in memory
to simulate analog circuits.

TimeData Acquisition Equipment - Signal Processing (Information Extraction)
For MCP detector (just need to know if there is a signal...)Signal voltage

Of the input whose voltage exceeds the thresholdvalue is recorded

Threshold ・Elapsed time from the start of measurement（Time stamp）

・The area of the waveform（Energy information）
Elapsed time

Timeis recorded.
The area of the waveform is recorded to distinguish

Signal voltage

between noise and signal that cannot be removed
by simply setting the threshold.

Threshold ←Noise signal area is small.
TimeData Acquisition Equipment - Signal Processing(Input)
Si Strip detector - I want to obtain energy information with high accuracy.
To improve energy accuracy, the signal
decay time is increased.
Signal voltage

Inputs analog signals andconverts them to digital data↓
The input voltage is measured
every 10 nanoseconds andstored in memory.
↓Time

Signal processing in memory

Data Acquisition Equipment - Signal Processing (Signal Processing)
Si Strip detector - I want to obtain energy information with high accuracy.
Elapsed time

To improve energy accuracy,Signal voltage

the signal decay time is increased.
Threshold

Since signal processing istime-consuming as it is, it isconverted to pseudo-triangular
waveform pulses.
↓Energy information is recorded
from the height of the triangular
waveform together with theTime
acquisition time stamp.
Height of triangular waveform is proportional to energy

Data Acquisition Equipment - Software
For MCP detector (for specific use, etc., in actual measurement.)

Data Acquisition Equipment - Software
For Si strip detector (for specific use, etc., in actual measurement.)

Data Acquisition Equipment - Software
At the time of measurement

Data Acquisition Equipment - Examples of data
to be acquired
Record energy and time stamps for each detector
Have the PC record the list data including information on which detector it is.
Data is expressed in binary numbers (one event is 80 binary digits)
80 bits per event
Time stamp (3)Time stamp (2)48 digits in total

Time stamp (integer part 1)
Time stamp (decimal portion)

Detector No. (4 digits)
Board number (3 digits)

Energy information (14 digits)(Reading the list data is difficult, so I will omit it this time...)Data Collection Equipment - Examples ofInformation Obtained
Time difference between MCP and strip detector Wave Height Distribution of MCPCountStriking event + noise
Striking event

Wave height distribution of elastic scattering monitor

TimeEnergyCount※ Sharp peaks strike event

Sharp peaks are elastic scattering events
EnergyData Collection Equipment - Examples ofInformation Obtained
We will give you the information obtained by organizing the list data.
Striking event(5.4 seconds after thestart of measurement)
Time until alphaparticles are emitted (ns)Strip No.

Evaporation Residual
Nucleus Launch(Next event)

Evaporation Residual
Nucleus Launch(Next event)
Energy Information(Digital value)

The strip detector
is always 1.

Data Acquisition Equipment - Example of DataAnalysis

alpha collapse (seconds)

Energy of alpha ray (keV)Count(/5keV)

Elapsed time toA good organization of the data you have given us will provide the following
information.

Energy of alpha ray (keV)
Let's count how many nuclei of any kind were made in the actual measurement.