Difference between revisions of "Sadiq Thesis"
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Example of error propagation for the above | Example of error propagation for the above | ||
+ | |||
+ | == Raw counts target in and out == | ||
+ | |||
+ | |||
+ | {| border="1" | ||
+ | |- | ||
+ | |run in||run out || NaI Left: image with cut || NaI Right: image with cut | ||
+ | |3735||3736 | ||
+ | ||[[File:hrrl_pos_27jul2012_data_ana_with_Cuts_r3735_ove_r3736_No_Norm_DL.png|100 px]] | ||
+ | ||[[File:hrrl_pos_27jul2012_data_ana_with_Cuts_r3735_ove_r3736_No_Norm_DR.png|100 px]] | ||
+ | |- | ||
+ | |} | ||
+ | |||
+ | Reprate = 300 Hz | ||
+ | |||
+ | Run time = 1002 s | ||
+ | |||
+ | Pulses = 301462 | ||
+ | |||
+ | Events = 9045 (Hz) | ||
+ | |||
+ | e+ rate NaI Left = 256 +- 16 (Hz). | ||
+ | |||
+ | {| border="1" | ||
+ | |- | ||
+ | |run in||run out || NaI Left: image with cut || NaI Right: image with cut | ||
+ | |3737||3736||[[File:hrrl_pos_27jul2012_data_ana_with_Cuts_r3737_ove_r3736_No_Norm_DL.png|100 px]] | ||
+ | ||[[File:hrrl_pos_27jul2012_data_ana_with_Cuts_r3737_ove_r3736_No_Norm_DR.png|100 px]] | ||
+ | |- | ||
+ | |} | ||
+ | |||
+ | Reprate = 300 Hz | ||
+ | |||
+ | Run time = 1094 s | ||
+ | |||
+ | Pulses = 329368 | ||
+ | |||
+ | Events = 15361 (Hz) | ||
+ | |||
+ | e+ rate NaI Left = 276 +- 16.6132 (Hz). | ||
==Background subraction== | ==Background subraction== |
Revision as of 03:03, 21 September 2012
Introduction
Positron
Positron is the antimatter of electron. Positrons have same mass as electron (
), carries positive charge, and it is noted as " ".Positrons predicted by Paul Dirac in 1928, <ref name="Dirac1928"> The Quantum Theory of the Electron, P. A. M. Dirac, Proc. R. Soc. Lond. A February 1, 1928 117 778 610-624;</ref>, and experimentally observed by Dmitri Skobeltsyn in 1929 and by Carl D. Anderson in 1932 <ref name="e+_discover"> General Chemistry, Taylor and Francis. p. 660. </ref>. Anderson also coined the term positron and he won the Nobel Prize for Physics in 1936.
<ref name="name"> BOOK_Gernal, Auther, Month_Year,issue,page </ref>
Positron Beamline History
Theory
positron creation from Bremsstrahlung
Positron rate prediction
Apparatus
HRRL Positron Beamline
Beam properties
Emittance Measurement
Energy Spread Measurement
Current, rep-rate
Radiation Footprint
Positron detection
DAQ setup
Data Analysis
Signal extraction
For 3 MeV and on detector show all the steps
- Raw counts target in and out (calibrated energy)
- Normalized counts
- background subtracted
- Integral (zoomed in and with error)
Example of error propagation for the above
Raw counts target in and out
run in | run out | NaI Left: image with cut | NaI Right: image with cut | 3735 | 3736 | ![]() |
![]() |
Reprate = 300 Hz
Run time = 1002 s
Pulses = 301462
Events = 9045 (Hz)
e+ rate NaI Left = 256 +- 16 (Hz).
run in | run out | NaI Left: image with cut | NaI Right: image with cut | 3737 | 3736 | ![]() |
![]() |
Reprate = 300 Hz
Run time = 1094 s
Pulses = 329368
Events = 15361 (Hz)
e+ rate NaI Left = 276 +- 16.6132 (Hz).
Background subraction
Sources of Systematic Errors
Efficiency measurement
acceptance, quad collection efficiency,
Conclusion
References
<references/>