robert michaels hamc hall a analysis workshop 09 c hamc = hall a monte carlo root / c++ design...
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Hall A Analysis Workshop 09
Robert Michaels HAMC
C
HAMC = Hall A Monte Carlo
• ROOT / C++ Design
• Somewhat like “SAMC” & “genercone”
• For HRS only. Uses LeRose transfer functions.
• Abstract classes: Experiment, Physics, Target
• Used by HAPPEX-3, PVDIS, and PREX.
A. Deur, V. Sulkosy D. Lhuillier, K. Paschke, B. Moffit
Contributors: Dustin McNulty, Diancheng Wang
or matrices, or “Guido” fcn.
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Hall A Analysis Workshop 09
Robert Michaels HAMC
CApplications of HAMC
• Estimate Rates, Asymmetry, Sensitivity to Physics
• Design Collimator, Sieve, “A_T” detector.
• Design integrating detector & focus at detector
• Estimate sensitivities to beam parameters.
• Effects of radiative corrections, acceptance.
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Hall A Analysis Workshop 09
Robert Michaels HAMC
HAMC Events
• Generate beam
• Target position uniformly sampled (raster option)
• Fill solid angle uniformly
• Cross-section computed for rates and weighting
• Asymmetry computed (for Parity Expts)
• Energy losses (Brehms and dE/dX) with MC methods
• Multiple Scattering
• Transport to various points in HRS and Septum
• Acceptance cuts applied at apertures
• Event Analysis on accepted events.
Objects
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Hall A Analysis Workshop 09
Robert Michaels HAMC
Transport Polynomials from John LeRose
(same)
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Hall A Analysis Workshop 09
Robert Michaels HAMC
Transport Polynomials (part 2) thanks, John LeRose
Was used to check where electrons scrape; e.g. not in iron of dipole ?
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Hall A Analysis Workshop 09
Robert Michaels HAMC
Cross Section Input
Shown here for Lead
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Hall A Analysis Workshop 09
Robert Michaels HAMC
Does HAMC work ? Yes, well enough for our goals.
A problem: Radiative tail out to high loss is underestimated. Use “effective target” size to adjust (reduce) predicted rates.
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Hall A Analysis Workshop 09
Robert Michaels HAMC
Comparing HAMC to Real Data
This was done for HAPPEX-1, HAPPEX-2, and a Lead test run
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Hall A Analysis Workshop 09
Robert Michaels HAMC
More Comparisons …
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Hall A Analysis Workshop 09
Robert Michaels HAMC
A Lead Test run in 2005(using old septum magnet)
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Hall A Analysis Workshop 09
Robert Michaels HAMC
PREX Design : At 50 the Optimal FOM is at 1.05 GeV (+/- 0.05)
1% @ ~1 GeV
RN
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Hall A Analysis Workshop 09
Robert Michaels HAMC
Collimator at entrance to spectrometer
Be degrader
Insertable blockerto block Be
Aligned in spectrometers to define identical Left / Right scattering angles as well as good up / down symmetry
A_T hole
Suppressing A_T systematics
Paul Souder
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Hall A Analysis Workshop 09
Robert Michaels HAMC
HAMC Design of Collimator
All Events
Collimator
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Hall A Analysis Workshop 09
Robert Michaels HAMC
Events from A_T hole (Be plug)
Main detector
A_T detector
Measures horizontal A_T systematic.
(Vertical is measured from Left/Right spectrometers)
Thanks:
Dustin McNulty
Krishna Kumar
Paul Souder
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Hall A Analysis Workshop 09
Robert Michaels HAMC
Sieve Slit Design
Few more holes drilled to improve coverage and accuracy.
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Hall A Analysis Workshop 09
Robert Michaels HAMC
),(
),(
dd
d
Add
dA
physics
measured),(
Acceptance Function
Analysis for Workshops and Future Publication
Credit:
C. J. Horowitz
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Hall A Analysis Workshop 09
Robert Michaels HAMC
CConclusions re: HAMC
• Reproduces data -- well enough.
• Has aided in several estimates and design efforts.
• Underestimates radiative losses -- maybe another MC better ?
• Restricted to HRS and single-arm at the moment.
• Might be easy to make a coincidence base class.
The GOOD
The BAD