&FIELD: SELECT

selection

• wire labels,
• labels of complete planes,
• strip_labels for parts of planes,
• the tube label,
• strip_labels for the tube,
• labels of weighting field maps,
• labels of SOLIDS,
• numeric identifications of wires, planes, tube and field maps,
• separators (blank, comma, colon and equal sign),
• round brackets.

A wire, a plane, the tube, a strip and a weighting field map are selected if their label appears in the selection string.

Solids with a label identical to that of a weighting field map are associated with the weighting field map. When an electron or ion hits one of these solids, the signal is classified as "direct" by the SIGNAL command, otherwise the signal is classified as "cross induced" - and it would not be computed unless the CROSS-INDUCED option has been switched on.

One can also select solids with labels that do not match a weighting field map - such solids are not linked with a read-out group, but they are taken into account by such instructions as ARRIVAL-TIME-DISTRIBUTION and DRIFT SOLIDS.

Separators need to be placed only between numeric identifiers, not between labels.

Brackets are used to group electrodes that need collective treatment. For instance, signals are summed over groups of electrodes.

An electrode may be selected only once, further selections are ignored in order to avoid ambiguities in group assignment.

Wires, planes, the tube and weighting field maps can also be selected by numeric identifications as follows:

[An initial selection is made in which all electrodes with an "S" label are assigned to a group of their own.]

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