Range Selection

EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH

Range and Class Selection Format

RANGE: A range can be defined starting at a given element and ending at another element, both elements included. Two forms exist:
```
range=position;
range=position1/position2;
```
In the first case, only one element is selected; in the second case, one or several elements are selected. NOTE: position1 must not be behind position2 in the sequence.
"position" is composed of the element name and an optional occurrence count in the sequence:
```
mq.ir5.l6..1          ! no occurrence count given
mb[17]                ! occurrence count given
```
There are two predefined MAD indices:
- #S. The start of the beam line expanded by USE,
- #E. The end of the beam line expanded by USE.
If, in the USE statement, only a range is selected:
```
use,period=lhcb1,range=ir1/ir5;
```
then "#s" and "#e" refer to the start and end of the expanded range, of course.
Examples for ranges:
```
..,range=#s;           ! first element
..,range=#s/#e;        ! full expansion range
..,range=mb[5]/#e;     ! from mb 5 to end
..,range=mq.ir5.l6..1; ! first occurrence of element mq.ir5.l6..1
```
CLASS: The single name of a class (no occurrence counts). A class is the name of an element (or basic type) from which other elements have been derived. Example:
```
mq:quadrupole;
q1:mq;
q2:mq;
q1..a:q1;
q2..b:q2;
```
makes classes from mq, q1, and q2. Selection class="mq" will actually select q1, q2, q1..a, and q2..b in the above example.
hansg, June 17, 2002