3.3.19 line

Elements are grouped into sequences by the line command.

line_name : line=(element_1,element_2,...);

where element_n can be any element or another line. Lines can also be reversed using line_name : line=-(line_2), or within another line by line=(line_1,-line_2). Reversing a line also reverses all nested lines within.

Example :

A sequence of FODO cells can be defines as

     
     qf: quadrupole, l=0.5, k1=0.1;
     qd: quadrupole, l=0.5, k1=-0.1;
     d: drift, l=0.5;
     fodo : line=(qf,d,qd,d);
     section : line=(fodo,fodo,fodo);
     beamline : line=(section,section,section);