source: PSPA/madxPSPA/doc/usrguide/ptc_auxiliaries/PTC_SetCavities.html

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12<title>PTC_SetCavities</title>
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20<center>
21  EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH
22  <IMG SRC="http://cern.ch/madx/icons/mx7_25.gif" align="right">
23  <h1>PTC_SetCavities</h1>
24  <h2> f90 routine that adjusts cavities and sets appropriate reference momenta
25       for a layout containing traveling wave cavities
26  </h2>
27</center>
28</div>
29
30
31<!--  ##########################################################              -->
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33<div class="madxdocContent">
34
35
36
37<h3> PROGRAMMERS MANUAL </h3>
38
39<p> <strong> CAUTION </strong> For the time being cavities MUST not be placed
40one after another, and at least a marker must be inserted between two
41neighboring accelerating structures.
42Otherwise, program will stop with the error message.
43
44<h4> Description </h4>
45
46<p> This routine sets up the properties of a layout and traveling wave cavities.
47The main goal is to update  reference beam energy for the elements
48that follow a traveling wave cavity.
49It traces the synchronous particle, i.e. one that has
50all its parameters set to zero at the beginning
51of the layout under study. At the point it arrives to a cavity,
52the parameters of the latter one are adjusted according to the switches
53defined by the user. There are 2 cases
54
55<ol>
56 <li> <b>Leaves all parameters untouched</b></li>
57 <li> <b>Phase of cavity is adjusted so it gives the maximum acceleration </b> 
58         Afterwards to the calculated phase the lag is added.
59         This setting is acquired using set_switch command, setting maxaccel
60         parameter to true.
61 </li>
62</ol>
63Afterwards,  the synchronous particle is tracked through traveling wave cavity
64and its energy gain is known.
65This energy becomes the reference one for all the elements downstream of the cavity.
66The particle is tracked further to the next cavity,
67for which the procedure described above is repeated.
68
69<p> Parameters of the cavities are dumped to the file named twcavsettings.txt.
70
71<p> At the end patches at the ends of the cavities are set,
72so the parameters after them are
73calculated taking to the account reference energy increase.
74
75<p> The exact program behavior depends on the
76<a href="PTC_SetSwitch.html"> PTC switches settings</a>.
77
78<p> Please note that in PTC phase velocity of a cavities wave is always equal to speed of light.
79Hence, if PTC internal state TIME is TRUE, what is the most correct setting,
80then voltage seen by a particle is varying along the structure. If TIME is FALSE,
81track is assumed to fly with speed of light
82and in such case a particle moves together with the wave front.
83
84
85</div>
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87</body>
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89</html>
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