ANASEN Monte Carlo (anasenMS.cpp)

Overview

anasenMS.cpp is a standalone Monte Carlo simulation for an ANASEN-style detector setup. It generates transfer reaction kinematics, propagates products to a wire chamber (PW) and a silicon array (SX3), reconstructs tracks, and writes output to a ROOT tree.

Requirements

ROOT (e.g. root-config for compile flags)
C++ compiler (gcc/g++)
Project includes: ClassTransfer.h, ClassAnasen.h, plus their dependent implementation files.

Build

In Armory directory:

g++ -O2 -o anasenMS anasenMS.cpp ClassTransfer.cpp ClassAnasen.cpp ... `root-config --cflags --libs`

(Adjust source file list based on actual project layout.)

Run

./anasenMS [numEvents]

numEvents: optional integer, default 1000000
Outputs: SimAnasen1.root containing tree

What the code does

Initializes reaction: TransferReaction transfer
- SetA(24,12,0) target
- SetIncidentEnergyAngle(10,0,0) beam energy and direction
- Seta, Setb reaction fragment indices
Sets excitation lists: ExAList, ExList
Vertex and resolution settings:
- vertexX/Y/Z ranges
- sigmaSX3_W, sigmaSX3_L, sigmaPW_A, sigmaPW_C
Loads energy loss tables from ../ELoss/ using TGraph for interpolation
Prepares ROOT output tree and branches for truth/reconstructed
Loop over events:
- Sample excitation and CM direction
- transfer.Event(thetaCM, phiCM) outputs TLorentzVector products
- Compute lab angles/energies
- Random vertex inside target volume
- Run detector response:
  - pw->FindWireID(...)
  - sx3->FindSX3Pos(...)
- Read out wire hits and SX3 channel + depth
- Apply position smearing for SX3
- Apply energy loss to light particle using interpolated dE/dx from table, based on path length from vertex to hit
- Reconstruct track via pw->CalTrack and pw->CalTrack2
- Fill ROOT tree
At end: write tree, close file, clean up

Notes

The code now has expanded inline comments explaining each stage.
Important methods are from:
- ClassTransfer (SetA, SetIncidentEnergyAngle, Seta, Setb, SetExA, SetExB, CalReactionConstant, Event)
- ClassAnasen / SX3 / PW (FindWireID, FindSX3Pos, GetHitInfo, CalTrack, CalTrack2, GetTrackTheta, GetTrackPhi, GetZ0, GetHitPosWithSigma, GetID, etc.)
Optional: change excitation lists, vertex spread, and sigma values to mimic different beam/target conditions.

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