&DRIFT: DRIFT: TRACK

graph

The following graphs can be produced:

TIME-GRAPH: the drift time from the starting point on the track until the particle hits an electrode, leaves the drift area etc.;
VELOCITY-GRAPH: the ratio of the length of the drift path and the drift time;
DIFFUSION-GRAPH: the integrated diffusion computed by propagating a probability cloud along the drift path if both transverse and longitudinal diffusion coefficients are known, and computed integrating the longitudinal coefficient if the transverse coefficient is not known;
AVALANCHE-GRAPH: the multiplication over the drift path.

The graphs can be customised with the FUNCTION-GRAPH option which takes as argument a function of the following parameters:

Variable	Meaning	Unit
`AVALANCHE`	Gain over the drift path	numeric
`LENGTH`	Drift-line path length	cm
`DIFFUSION`	Integrated diffusion	\μsec
`LOSS`	Survival probability	numeric
`TIME`	Total drift time	\μsec
`X_END or R_END`	x Or r at drift-line end	cm
`Y_END or PHI_END`	y Or \φ at drift-line end	cm or degrees
`Z_END`	z At drift-line end	cm
`X_START or R_START`	x Or r at drift-line start	cm
`Y_START or PHI_START`	y Or \φ at drift-line start	cm or degrees
`Z_START`	z At drift-line start	cm

Further details on the survival probability can be found under the method used to integrate the attachment coefficients.

Care should be taken that the AREA is chosen sufficiently large to let the particles reach their target.

You may switch off the printing and plotting of both drift-lines and the plotting of isochrons if you're only interested in the graph.

The graph is drawn either as a line or as a set of markers, depending on the setting of the MARKER and SOLID options.

[By default, no graphs are produced. The set of requested graphs is remembered from one call to the next.]

MARKER

The options MARKER and SOLID determine the way the graphs are plotted.

MARKER means that all points are represented by small symbols, e.g. crosses. The symbol that is chosen, as well as its size and colour are taken from polymarker representation FUNCTION-1.

SOLID means that points for drift-lines that reach the same end point are joined by straight line segments. The line type, width and colour are taken from polyline representation FUNCTION-1. Sections of the graph where the drift-lines reach a different end point are separated by vertical lines drawn with the COMMENT polyline representation.

[The initial default is SOLID.]

Go to the top level, to &DRIFT, to DRIFT, to TRACK, to the topic index, to the table of contents, or to the full text.

Formatted on 21/01/18 at 16:55.