BigBite Analytical Model (12/14/10)

Here is my currently best analytical model of a BigBite spectrometer. The code is written in Cern ROOT. Please download it from the following link:

BigBiteAnalyticalModel.C

The model assumes that BigBite consists of a single ideal dipole magnet, followed by the hadron-detector-package. The "effective" dimensions of the magnet and "effective" distances between various parts of the spectrometer can be found here:

Positions.pdf

To compile the code, use the following ROOT command:

.L BigBiteAnalyticalModel.C++

The program has two functions. First function draws 2D track through the BigBite for any valid combination of the Focal-Plane coordinates (x,th,y,ph). An example is shown here:

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To draw track, use the following command:

BigBiteAnalyticalModelTrack(x,y,ph,th)

The second function does the analysis of the real data, using the analytical model to calculate BigBite target variables (y,th,ph,delta). Please see the code, for the ROOT variables, that are needed by this code. To run it, use the following command:

BigBiteAnalyticalModelAnalysis(number_of_events)

Here are some analysis results, using analytical model:

Results for elastic Deuterium run #2413

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Results for production 3He runs:

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Results for 12C sieve run #3491:

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Results for Hydrogen sieve run #3488:

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Last modified: 12/14/10