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| 11 | <link rel="stylesheet" type="text/css" href="../ptc_general/madxdoc_ps.css" /> |
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| 12 | <title>PTC_SELECT</title> |
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| 13 | <style> |
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| 14 | </style> |
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| 15 | </head> |
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| 17 | <body bgcolor="#ffffff"'> |
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| 18 | |
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| 19 | <div style="text-align:center;"> |
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| 20 | <center> |
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| 21 | EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH |
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| 22 | <IMG SRC="http://cern.ch/madx/icons/mx7_25.gif" align="right"> |
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| 23 | <h1>PTC_SELECT</h1> |
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| 24 | |
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| 25 | </center> |
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| 26 | </div> |
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| 27 | |
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| 28 | |
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| 29 | <!-- ########################################################## --> |
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| 30 | |
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| 31 | <div class="madxdocContent"> |
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| 32 | |
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| 33 | |
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| 34 | <!-- ########################################################## --> |
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| 35 | <!-- ########################################################## --> |
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| 36 | <!-- ########################################################## --> |
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| 37 | |
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| 38 | <h3 align=center style='margin-top:0cm;text-align:left;text-indent:0cm'> |
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| 39 | <span> |
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| 40 | USER MANUAL |
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| 41 | </span> |
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| 42 | </h3> |
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| 43 | |
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| 44 | <div> |
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| 45 | |
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| 46 | <!-- ########################################################## --> |
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| 47 | |
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| 48 | <h4>SYNOPSIS</h4> |
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| 49 | |
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| 50 | <pre> |
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| 51 | <big> |
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| 52 | PTC_SELECT, |
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| 53 | table = [s, none, none], |
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| 54 | column = [s, none, none], |
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| 55 | polynomial = [i, none] , |
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| 56 | monomial = [s, none] , |
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| 57 | parametric = [l, false, true], |
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| 58 | quantity = [s, none] ; " |
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| 59 | |
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| 60 | </big> |
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| 61 | </pre> |
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| 62 | |
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| 63 | </div> |
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| 64 | |
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| 65 | <!-- ########################################################## --> |
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| 66 | |
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| 67 | <h4> Description </h4> |
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| 68 | |
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| 69 | <div> |
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| 70 | Selects map elements to be: |
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| 71 | <p> |
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| 72 | a) <b>Stored in a user specified table and column.</b> <i>Table</i> and <i>column</i> must be specified than, |
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| 73 | and such table with such column must exists. |
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| 74 | <p> |
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| 75 | b) <b>Stored as a function (taylor series) of |
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| 76 | <a href="PTC_Knob.html">knobs</a>, if any is defined.</b> |
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| 77 | Than, <i>parametric</i> should be set to true. |
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| 78 | |
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| 79 | Both a) and b) can be joined in one command. |
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| 80 | |
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| 81 | |
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| 82 | </div> |
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| 83 | |
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| 84 | <h4> Examples</h4> |
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| 85 | |
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| 86 | <p> |
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| 87 | <a href="http://cern.ch/frs/mad-X_examples/ptc_madx_interface/ptc_secordmatch/chicane.madx"> dog leg chicane </a> : |
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| 88 | strength of quads is matched to obtain required T112 value. |
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| 89 | |
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| 90 | |
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| 91 | <p> |
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| 92 | <a href="http://cern.ch/frs/mad-X_examples/ptc_madx_interface/eplacement/chicane.madx"> dog leg chicane </a> : |
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| 93 | postion of quads is matched to obtain required T566 value. |
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| 94 | |
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| 95 | <p> |
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| 96 | <a href="http://cern.ch/frs/mad-X_examples/ptc_madx_interface/matchwithknobs/matchwithknobs.madx"> dog leg chicane </a> : |
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| 97 | dipols and quads strengths are matched with the help of knobs to obtain required momentum compaction and Twiss functions. |
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| 98 | |
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| 99 | <!-- ########################################################## --> |
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| 100 | |
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| 101 | <h4> Command parameters and switches </h4> |
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| 102 | <div> |
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| 103 | |
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| 104 | <dl> |
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| 105 | <dt><b> table </b></dt> |
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| 106 | <dd> |
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| 107 | <i> string, </i> |
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| 108 | <p> Specifies name of the table where values should be stored. |
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| 109 | </dd> |
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| 110 | |
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| 111 | |
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| 112 | <dt><b> column </b></dt> |
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| 113 | <dd> |
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| 114 | <i> string, </i> |
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| 115 | <p> Specifies name of the table where values should be stored. |
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| 116 | </dd> |
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| 117 | |
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| 118 | <dt><b> polynomial </b></dt> |
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| 119 | <dd> |
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| 120 | <i> integer, </i> |
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| 121 | <p> Specifies row of the map. |
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| 122 | </dd> |
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| 123 | |
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| 124 | |
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| 125 | <dt><b> monomial </b></dt> |
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| 126 | <dd> |
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| 127 | <i> string composed of digits </i> |
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| 128 | <p> Defines monomial of the polynomial in PTC nomenclature. |
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| 129 | Its lengh should be equal to number of variables. Each of digits corresponds |
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| 130 | to the exponent of a variable. Monomial 'ijklmn' defines |
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| 131 | x<sup>i</sup>p<sub>x</sub><sup>j</sup>y<sup>k</sup>p<sub>y</sub><sup>l</sup> |
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| 132 | ΔT<sup>m</sup>(Δp/p)<sup>n</sup>. |
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| 133 | For example, element=2 and monomial=1000000 |
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| 134 | defines coefficient of the second polynomial (that defines p<sub>x</sub>) |
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| 135 | close to x, in the other words it is R21. |
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| 136 | |
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| 137 | </dd> |
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| 138 | |
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| 139 | |
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| 140 | <dt><b> parametric </b></dt> |
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| 141 | <dd> |
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| 142 | <i> logical, default false, if value explicitly not specified then true</i> |
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| 143 | <p> If it is true, and any |
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| 144 | <a href="PTC_Knob.html">knobs</a> |
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| 145 | are defined the map element is stored as the parametric result. |
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| 146 | |
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| 147 | </dd> |
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| 148 | |
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| 149 | |
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| 150 | |
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| 151 | </dl> |
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| 152 | |
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| 153 | |
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| 154 | |
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| 155 | <!-- ############################################################ --> |
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| 156 | <!-- ############################################################ --> |
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| 157 | <!-- ############################################################ --> |
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| 158 | <h4> PROGRAMMERS MANUAL </h4> |
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| 159 | |
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| 160 | <p> |
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| 161 | The command is implemented pro_ptc_select function in madxn.c and |
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| 162 | by subroutine addpush in madx_ptc_knobs.f90, that is part of |
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| 163 | madx_ptc_knobs_module |
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| 164 | |
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| 165 | <p> |
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| 166 | On the very beginning the existance of the table and within column is checked. |
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| 167 | In the case of failure, error message is printed and the function is abandoned. |
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| 168 | |
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| 169 | <p> |
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| 170 | The command parameters are passed as the arguments of addpush Fortran routine. |
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| 171 | A selection is stored in a type called tablepush_poly defined madx_ptc_knobs.inc. |
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| 172 | A newly created object is added to array named pushes. |
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| 173 | |
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| 174 | <p> |
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| 175 | More then one element might be stored in a single table, so the module must assure that |
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| 176 | each of tables is augmented only ones for each magnet (or integration slice). |
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| 177 | For that purpose array of tables to be augmented (named tables) is stored separately and |
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| 178 | we assure that a table is listed here only ones. This is simply done by checking |
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| 179 | if a table name is not already listed before adding a new element to the array. |
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| 180 | |
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| 181 | <p> |
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| 182 | In case the user requested an element to be stored in the paramteric format, |
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| 183 | and column in the array of parametric results is reserved and the index of the column is |
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| 184 | remembered in index field of tablepush_poly type is filled. In the other case this field |
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| 185 | is equal to zero. |
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| 186 | |
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| 187 | <p> |
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| 188 | The routine ptc_twiss (defined in file madx_ptc_twiss.f90), after tracking each of magnets |
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| 189 | in the sequence, calls putusertable routine. This routine loops over selected elemetns defined |
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| 190 | in the pushes table. For each of them it extracts the requested element from the map using .sub. |
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| 191 | operator of PTC and stores it in the defined table and column. |
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| 192 | If index field is not zero and any knob is defined, it extracts the polynomial using .par. |
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| 193 | operator, and stores it in the 2D array called results, in the row corresponding to the number |
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| 194 | of the magnet (or integration step) and column defined by the index field. |
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| 195 | |
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| 196 | |
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| 197 | |
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| 198 | </div> |
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| 199 | |
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| 200 | </body> |
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| 201 | |
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| 202 | </html> |
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