GeoServer Class Reference

The GeoServer class reads, stores, and applies alignment constants. More...

#include <GeoServer.h>

List of all members.

Public Member Functions
	GeoServer ()
	Constructor for intialization.
	~GeoServer ()
	Destructor.
int	ReadFile (char *filename)
	Reads all constants from a text file.
void	ReadArray (double *a)
	Reads all constants from an array.
void	Print ()
	Prints all alignment values for debugging.
double	GetPitch (CSCHit *hit)
	Provides the Pitch value of the strips in mm for X and Y hits in small and large chambers.
double	GetZ (double x, double y, int phi, int layer)
	Provides the Z coordinate in mm for a chamber and layer.
double	GetY (double y, double x, int phi, int layer, int isLargeChamber)
	Provides the Y coordinate in mm for a Y hit.
double	GetX (double x, double y, int phi, int layer, int isLargeChamber)
	Provides the X coordinate in mm for a X hit.
double	GetYStrip (double y, double x, int phi, int layer, int isLargeChamber)
	Provides the Y strip that corresponds to the given Y coordinate.
double	GetXStrip (double x, double y, int phi, int layer, int isLargeChamber)
	Provides the X strip that corresponds to the given X and Y coordinate.

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Detailed Description

The GeoServer class reads, stores, and applies alignment constants.

Currently, there is an X and Y offset for each chamber, and a rotation angle. There is also a layer thickness parameter and the z position of the 2nd and 3rd chamber. The first chamber has z=0 and the last one z=441*3mm. The data is read from text files written by the align.cpp program.

Lookup of constants uses the channelID of a strip, which makes it independent of the chamber number and readout order.

This is meant to work only for the fixed chambers in the cosmic stand.

Status:

just written.

Todo:

test this scheme and improve it if necessary.

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Constructor & Destructor Documentation

GeoServer::GeoServer (   )

Constructor for intialization. All offsets and angles are zero, z values are set to defaults.

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Member Function Documentation

double GeoServer::GetPitch (  CSCHit *  hit  )

Provides the Pitch value of the strips in mm for X and Y hits in small and large chambers. Parameters: hit  a pointer to the hit. Returns: the stip Pitch in mm.

double GeoServer::GetX (  double  x, double  y, int  phi, int  layer, int  isLargeChamber )

Provides the X coordinate in mm for a X hit. The rotation is applied and a Y coordinate must be supplied. Use this form if the y coordinate comes from a line fit and not from a Y hit. Parameters: x  the X reconstruction result in (fractional) strips. y  the Y reconstruction result in (fractional) strips. layer  the layer number between 0 and 3. isLargeChamber  is 0 for small chambers and 1 for large ones. Returns: the X coordinate in mm relative to the center of the chamber.

double GeoServer::GetXStrip (  double  x, double  y, int  phi, int  layer, int  isLargeChamber )

Provides the X strip that corresponds to the given X and Y coordinate. The rotation is applied, so a Y coordinate is needed. Parameters: x  the x coordinate in mm, relative to the center of the detector. y  the y coordinate in mm, relative to the center of the detector. phi  the phi number between 0 and 3 of the chamber. layer  the layer number between 0 and 3. isLargeChamber  is 0 for small chambers and 1 for large ones. Returns: the fractional X strip number between 0 and 191.

double GeoServer::GetY (  double  y, double  x, int  phi, int  layer, int  isLargeChamber )

Provides the Y coordinate in mm for a Y hit. No rotation is applied. Parameters: y  the reconstructed fractional strip number. x  the reconstructed fractional strip number. phi  the phi number between 0 and 3 of the chamber. layer  the layer number between 0 and 3. isLargeChamber  is 0 for small chambers and 1 for large ones. Returns: the Y coordinate in mm relative to the center of the chamber.

double GeoServer::GetYStrip (  double  y, double  x, int  phi, int  layer, int  isLargeChamber )

Provides the Y strip that corresponds to the given Y coordinate. No rotation is applied. Parameters: y  the y coordinate in mm, relative to the center of the detector. x  the x coordinate in mm, relative to the center of the detector. phi  the phi number between 0 and 3 of the chamber. layer  the layer number between 0 and 3. isLargeChamber  is 0 for small chambers and 1 for large ones. Returns: the fractional Y strip number between 0 and 48.

double GeoServer::GetZ (  double  x, double  y, int  phi, int  layer )

Provides the Z coordinate in mm for a chamber and layer. Parameters: phi  the phi value of a chamber from 0 to 3. layer  the layer number of a chamber from 0 to 3. x  the x coordinate in strip numbers. y  the y coordinate in strip numbers. Returns: the Z coordinate in mm relative to the leftmost chamber.

void GeoServer::ReadArray (  double *  a  )

Reads all constants from an array. This call can be used to read constants from Minuit. Parameters: a  the array of double prec. values to read from.

int GeoServer::ReadFile (  char *  filename  )

Reads all constants from a text file. This call can be skipped for Monte Carlo data, since the constructor already initializes the values. Parameters: filename  the name of the text file. Returns: 1 if there was no error, otherwise 0.

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The documentation for this class was generated from the following files:

• GeoServer.h
• GeoServer.cpp

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