Difference between revisions of "Sadiq Thesis"

From New IAC Wiki
Jump to navigation Jump to search
Line 39: Line 39:
  
 
==Signal extraction==
 
==Signal extraction==
 +
 +
#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
 +
 
==Background subraction==
 
==Background subraction==
  

Revision as of 17:53, 20 September 2012

Introduction

Positron

Positron is the antimatter of electron. Positrons have same mass as electron ( [math]511~\frac{keV}{c^2}[/math]), carries positive charge, and it is noted as "[math]e^+[/math]".

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

  1. Raw counts target in and out (calibrated energy)
  2. Normalized counts
  3. background subtracted
  4. Integral (zoomed in and with error)

Example of error propagation for the above

Background subraction

Sources of Systematic Errors

Efficiency measurement

acceptance, quad collection efficiency,

Conclusion

References

<references/>