source: PSPA/madxPSPA/doc/usrguide/threader/threader.html @ 430

Last change on this file since 430 was 430, checked in by touze, 11 years ago

import madx-5.01.00
File size: 1.6 KB
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1<html>
2<head>
3<title>Threader</title>
4</head>
5
6<body bgcolor="#ffffff">
7
8EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH
9<IMG SRC=../icons/mx7_25.gif align=right>
10<h2>Beam Threader</h2>
11</center>
12<!p>
13<!H4><!IMG ISMAP SRC="http://cern.ch/Frank.Schmidt/dynap/icons/at_work.gif"height=90><!Under construction and not yet reliable!!!!!><!/A><!/H4>
14<!/P>
15
16The <b>threader</b> simulates beam steering through a machine with field and
17alignment errors in situations where the beam does not circulate and the
18closed orbit cannot be measured.
19<p>
20If enabled, threading is executed whenever a trajectory or closed orbit search is
21carried out by the
22<A HREF="../twiss/twiss.html">TWISS</A> module.
23<p>
24The following MAD-X commands control the action of the threader :
25
26<p><br><br><pre>
27<b>option, threader ;</b>
28</pre>
29
30enables the threader
31<p>
32when set, the threader checks at all monitors the difference with
33respect to the stored orbit there (from
34<A HREF="../twiss/twiss.html">keeporbit</A>) if
35<A HREF="../twiss/twiss.html">useorbit</A> is
36present. The threader then provides kicks (if possible) to reduce
37the orbit difference below the maxima specified on the threader
38command. This procedure allows to thread with orbit bumps present
39
40<p><br><br><pre>
41<b>threader, vector = {xmax, ymax, att} ;</b>
42</pre>
43
44sets the parameters for the threader
45<pre>
46xmax, ymax : orbit excursion (at a monitor) at which threader acts
47att        : attenuation factor for the kicks applied by the threader
48defaults   : {0.005, 0.005, 1.000}
49</pre>
50
51<p><br><br>
52<HR><address>
53Hans Grote, 31.10.2008
54</address>
55
56</body>
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