Wire Number Function

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Function for the wire number in the detector frame for change in [math]\phi[/math] and constant [math]\theta[/math] in the lab frame

Using the expression for wire number n in terms of [math]\theta[/math] for the detector mid-plane where [math]\phi=0[/math]:

[math]n = \frac{-957.412}{\tan(\theta)+2.14437}+430.626[/math]

We can use the inverse of this function to find the neighboring wire's corresponding angle theta

[math]\theta\equiv 4.49876 +0.293001 n+0.000679074 n^2-3.57132\times 10^{-6} n^3[/math]

[math]\theta(n \pm 1)\equiv 4.49876 +0.293001 (n \pm 1)+0.000679074 (n \pm 1)^2-3.57132\times 10^{-6} (n \pm 1)^3[/math]

We also know what the x' function must follow dependent on phi in the detector plane



[math]x_{D1}=r_{D1}\ cos(\phi)\qquad y_{D1}=r_{D1}cos(\phi)\qquad z_{D1}=r_{D1} cot(\theta)[/math]

[math]x_{D2}=r_{D2} cos(\phi)\qquad y_{D2}=r_{D2} sin(\phi)\qquad z_{D2}=r_{D2} cot(\theta)[/math]



[math]r_{D1}=R_{Lower\ Dandelin}cos(\theta)=(ae-\Delta a) tan(65^{\circ})cos(\theta)\qquad \qquad r_{D2}=R_{Lower\ Dandelin}cos(\theta)=(ae+\Delta a) tan(65^{\circ})cos(\theta)[/math]

We can take this point to be the x axis intercept and use the fact that each wire is titled by 6 degrees to the horizontal in the plane of the detector to create an equation

[math]x_{wire\ n}'=tan(6^{\circ})y'+x_{n_0}[/math]

where the initial wire and x' position at the given theta is represented by [math]n_0[/math]

This equation can be solved for a hypothetical wire 0, which will allow the wire number to be the multiplicative factor for the change from the starting position.

[math]\frac{x_{n=1}}{sin 5.2311^{\circ}}=\frac{2.52934}{sin 109.7689^{\circ}} \Rightarrow x_{n=1}=.24505[/math]

Since each wire is separated by .01337 meters


Each wire becomes an equation of the form,

[math]x_{wire\ n}'=tan(6^{\circ})y'+.23168+.01337\ n[/math]

This agrees with CED simulation

DC geom.png


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