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HAMC = H all A M onte C arlo PowerPoint PPT Presentation


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HAMC = H all A M onte C arlo. C. Contributors: Dustin McNulty, Diancheng Wang. ROOT / C++ Design Somewhat like “SAMC” & “genercone” For HRS only. Uses LeRose transfer functions. Abstract classes: Experiment, Physics, Target

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HAMC = H all A M onte C arlo

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Hamc h all a m onte c arlo

HAMC = Hall AMonte Carlo

C

Contributors: Dustin McNulty, Diancheng Wang

  • 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

or matrices, or “Guido” fcn.


Hamc h all a m onte c arlo

Applications of HAMC

C

  • 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.


Hamc h all a m onte c arlo

HAMC Events

Objects

  • 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.


Hamc h all a m onte c arlo

Transport PolynomialsfromJohn LeRose

(same)


Transport polynomials part 2

Transport Polynomials (part 2)

thanks, John LeRose

Was used to check where electrons scrape; e.g. not in iron of dipole ?


Hamc h all a m onte c arlo

Cross Section Input

Shown here for Lead


Hamc h all a m onte c arlo

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.


Hamc h all a m onte c arlo

Comparing HAMC to Real Data

This was done for HAPPEX-1, HAPPEX-2, and a Lead test run


Hamc h all a m onte c arlo

More Comparisons …


Hamc h all a m onte c arlo

A Lead Test run in 2005

(using old septum magnet)


Hamc h all a m onte c arlo

PREX Design : At 50the Optimal FOM is at 1.05 GeV (+/- 0.05)

RN

1% @ ~1 GeV


Hamc h all a m onte c arlo

Collimator at entrance to spectrometer

 Suppressing A_T systematics

Paul Souder

Aligned in spectrometers to define identical Left / Right scattering angles as well as good up / down symmetry

A_T hole

Be degrader

Insertable blocker

to block Be


Hamc h all a m onte c arlo

HAMC Design of Collimator

All Events

Collimator


Hamc h all a m onte c arlo

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


Hamc h all a m onte c arlo

Sieve Slit Design

Few more holes drilled to improve coverage and accuracy.


Hamc h all a m onte c arlo

Analysis for Workshops and Future Publication

Acceptance Function

Credit:

C. J. Horowitz


Hamc h all a m onte c arlo

Conclusions re: HAMC

C

The GOOD

  • 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 BAD


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