[u/mrichter/AliRoot.git] / PHOS / PHOS-HTML / geometry.html

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    <title>PHOS Geometry in AliRoot</title>
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  <body>
    
    <h1 class="page-header">
      Geometry & Materials
    </h1>
    <h1>
      Simulation
    </h1>
    The simulation is done in two steps, one which describes the detector geometry
    and material and one which does the particle tracking and stores the hits
    and digits in a  <a href="http://root.cern.ch/root/html/TTree.html">TTree</a> itself written on a disk file. These two steps are
    steered through the Config.C file(<a href="PHOSConfig_Central.C">example</a>), 
    a root macro launched at the AliRoot prompt. To customize this file you must:
    <br><br>
    <ol>
      <li>
	select a file name for the root output:
	<pre class="code">
	//=======================================================================
	//  Create the output file
	sprintf(filename,"<b>myfilename</b>.root");
	</pre>
	</li>
      <li>
	Define your event generator and simulations parameters:
	<pre class="code">
         AliGenCocktail *gener = new AliGenCocktail(); // Cocktail class
         gener->SetPtRange(.02,10.00);                 // Transverse momentum range   
         gener->SetPhiRange(180.,360.);                // Azimuthal angle range  
         gener->SetYRange(-0.25,0.25);                 // Pseudorapidity range
         gener->SetOrigin(0,0,0);                      // Vertex position
         gener->SetSigma(0,0,5.6);                     // Sigma in (X,Y,Z) (cm) on IP position
         gener->Init();                                // Initialize the generator
	</pre>
      </li>
      <li>
	Select the detector seen by the tracking:
	<pre class="code">
         Int_t iPHOS=1;    // PHOS is in
         Int_t iPMD=0;     // PMD  is out
	</pre>
      </li>
      <li>
	Create a PHOS object (<b>GPS2</b> is so far the unique configuration option, see below):
	<pre class="code"> 
         if(iPHOS) {
         //=================== PHOS parameters =========================== 
         AliPHOS *PHOS  = new AliPHOSv0("PHOS","<b>GPS2</b>");
	</pre>
      </li>
    </ol>
    <p>
      You van now run the simulation by entering the following command at the aliroot prompt:
      <pre class="code">
       aliroot> gAlice->Run(1,"PHOSConfig_Central.C");  
    </pre>
    <h1>
      Geometry
    </h1>
    <h4>
      Definition
    </h4>
    PHOS consists of two distinct parts. The calorimeter, named EMCA, consists
    of the PbW04 crystals within their housing. The crystals are assembled
    in <i>fNModules</i> modules of <i>fNPhi </i>rows along the x-axis direction
    and <i>fNZ</i> modules along the z-axis direction. Since the total number
    of crystals and their layout within ALICE is presently (11/11/1999) not
    final it was decided to fully parametrize the geometry. A change in any
    of the three previously defined parameters will provide automatically a
    new layout of the modules.
    <br>The second part of PHOS is the charged particle identifier. Since until
    end of 2000 no decision will be taken on the final design of this element
    two or more versions can be considered. Today (11/11/1999) only one version
    is implemented and is named PPSD for PHOS Pre-Shower Detector. It consists
    of a first layer of <i>fNumberOfModulesPhi</i> x <i>fNumberOfModulesZ </i>gas
    detectors per PHOS module, each detectors being subdivided into <i>fNumberOfPadsPhi</i>
    x <i>fNumberOfPadsZ </i>gas cells, a Lead converter and a second layer
    of gas detectors identical to the first layer. This second part is positionned
    on top of the EMCA module.
    <p>
      The class <a href="./html/AliPHOSv0.html"> AliPHOSv0 </a> ( <a href="./html/AliPHOSv0_Tree.ps"> inheritance tree </a>) 
      describes this geometry. We have defined also a class 
      <a href="./html/AliPHOSv1.html"> AliPHOSv1 </a> ( <a href="./html/AliPHOSv1_Tree.ps"> inheritance tree </a>) 
      which in addition contains the photodiode response and the light transport through the crystal.
    <p>
      The parameters of the geometry are given in class  <a href="./html/AliPHOSGeometry.html"> AliPHOSGeometry </a>( <a href="./html/AliPHOSGeometry_Tree.ps"> inheritance tree </a>)
      <br><br>
    <center>
      <img SRC=" images/EMCinAlice.gif" ALT="Geant Tree for PHOS" >
      <br><br>
      <b> Figure 1.a: </b> <i> GEANT Tree which describes the EMC-PHOS geometry </i>
    </center>
    <P>
    <center>
      <img SRC=" images/PPSDinAlice.gif" ALT="Geant Tree for PHOS" >
      <br><br>
      <b> Figure 1.b: </b> <i> GEANT Tree which describes the PPSD-PHOS geometry </i>
    </center>
    <h4>
      Implementation
    </h4>
    <p>
    <center>
      <img SRC="./images/aliphossimulation.gif" ALT="Geom/Simul class diagram" >
      <br><br>
      <b> Figure 2.: </b> <i> Class diagram for the geometry/simulation package </i>
    </center>
    <p>
      <a href="./html/AliPHOS.html"><i><u>AliPHOS</u></i></a>: This is the base class. It derives from <i>AliDetector.
      </i>It's only purpose is to describe the materials
      (&agrave; la <i>AliMC</i>) needed for the EMCA and PPSD construction.
    <p>
      <a href="./html/AliPHOSv0.html"><i><u>AliPHOSv4</u></i></a>: It derives from <i>AliPHOS</i>.
      <br>
    <ul>
      <li>
	It sets up the geometry for the Root display (<i>AliPHOSv4::BuildGeometry()</i>)
	and for the GEANT tracking (<i>AliPHOSv4::CreateGeometry()</i>).
      </li>
      <li>
	It watches the tracks passing through the active media of EMCA and PPSD
	(<i>AliPHOSv4::StepManager()</i>).
      </li>
      <li>
	It stores the hits (<i>AliPHOSv4::AddHit()</i>), using the <i>AliPHOSHit</i>
	class.
      </li>
      <li>
	It stores the digits (<i>AliPHOSv4::FinishEvent()</i>), using the <i>AliPHOSDigit</i>
	class.
      </li>
    </ul>
    <p>
      <a href="./html/AliPHOSv1.html"><i><u>AliPHOSv1</u></i></a> : derives from <i>AliPHOSv0</i> and includes the light transport 
      in the crystal and the response of the PIN photodiode &agrave; la O. H. Oddland.
    <p>
      <a href="./html/AliPHOSvFast.html"><i><u>AliPHOSvFast</u></i></a> : used for <a href="fastsimulation.html">fast simulation</a>.
    <p>
      <a href="./html/AliPHOSGeometry.html"><i><u>AliPHOSGeometry</u></i></a> : It derives from <i>TObject</i> to make it
	persistent. It is a singleton, i.e., a pointer to the unique instance of
	this class is obtained by:
    <center>
      <pre class="code">
        AliPHOSGeometry * Geom = AliPHOSGeometry::GetInstance()
      </pre>
    </center>
    <ul>
      <li>
	It sets the various parameters for the geometry description and provides
	the method to access all the parameters. To avoid cumbersome macros at
	run time these parameters can only be changed manually in the source code.
      </li>
      <li>
	It provides the method to convert the absolute detector Id (crystal in
	EMCA or pad in PPSD) into a relative Id : PHOS module number, PPSD module
	number, row, column (<i>AliPHOSGeometry::AbsToRelNumbering()</i>) and the
	reverse operation (<i>AliPHOSGeometry::RelToAbsNumbering()</i>).
      </li>
      <li>
	It provides the method to convert an absolute Id into a three-vector giving
	the position of the detector in ALICE (<i>AliPHOSGeometry::RelPosInAlice()</i>).
      </li>
    </ul>
    <p>
       <a href="./html/AliPHOSHit.html"><i><u>AliPHOSHit</u></i></a>: It derives from <i>AliHit</i>. It stores the
	hits as the pair (absolute Id, deposited energy). The hits presently are stored  in the hit TTree 
	as one hit per elementary cell (EMC crystal or PPSD gas cell) (See the 
	the AddHit() method in <i>AliPHOSv0</i>).
    <p>
       <a href="./html/AliPHOSDigit.html"><i><u>AliPHOSDigit</u></i></a> : It derives from <i>AliDigit</i>. It stores
      the digits as the pair (absolute Id, energy) in the digit Tree (see 
      the FinishEvent() method in <i>AliPHOSv0</i>).
    <h1>
      Usage
    </h1>
    <p>
    <pre class="code">
     Int_t iPHOS=1;
     if(iPHOS) {
     AliPHOS * phos = new AliPHOSv4("PHOS", char * name) ;
    </pre>
    <br>
    where name can take the following values:
    <ul>
      <li>
	<i>GPS2</i>: will create EMCA plus PPSD
	<br><br>
	<center>
	  <img SRC="images/AliPHOSv0AllViews.gif" ALT="ROOT display of PHOS: All Views" >
	  <b> Figure 3a.: </b> <i> ROOT Display of ALICE: All Views   </i>
	  <p>
	    <img SRC="images/AliPHOSv0FrontView.gif" ALT="ROOT display of PHOS: Front View" >
	    <b> Figure 3b.: </b> <i> ROOT Display of ALICE: Front Views   </i>
	  <p>
	    <img SRC="images/AliPHOSv03DView1.gif" ALT="ROOT display of PHOS: 3D View" >
	    <b> Figure 3c.: </b> <i> ROOT Display of ALICE: All View3   </i>
	  <p>
	    <img SRC="images/AliPHOSv0PPSDFrontView.gif" ALT="Zoom on PPSD: Front View " >
	    <b> Figure 4.a: </b> <i> ROOT Display of ALICE: zoom on PPSD, Front Views  </i>
	  <p>
	    <img SRC="images/AliPHOSv0PPSDPerspectiveView.gif" ALT="Zoom on PPSD: Perspective View " >
	    <b> Figure 4.b: </b> <i> ROOT Display of ALICE: zoom on PPSD, Perspective View  </i>
	</center> <br><br>
      </li>
      <li>
	more to come from Protvino (EMCA plus other CPV type)</li>
    </ul>
    <br>
    EMCA consists of 5 modules of 64x64 modules each, positionned at
    azimuthal angles -40, -20, 0, +20, +40 (see figures). PPSD consists per
    EMCA module of 2 layers of 4x4 gas detectors each, each detector having
    24x24 gas cells. 
<hr>
<address class="left">
      &copy; <a href="mailto:schutz@in2p3.fr">>Groupe Photons Subatech (Yves SCHUTZ)</a>
      <a href="http://www-subatech.in2p3.fr/~photons/subatech/en_index.shtml">[Go
	to the GPS Home Page]</a>
</address>
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Commit	Line	Data
65163b68	1	<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"
	2	"http://www.w3.org/TR/REC-html40/loose.dtd">
	3	<html>
c2583e52	4	<head>
	5	<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
	6	<meta name="GENERATOR" content="Mozilla/4.51 [en] (X11; I; Linux 2.2.5-15 i686) [Netscape]">
	7	<title>PHOS Geometry in AliRoot</title>
	8	<link REL="stylesheet" href="http://www-subatech.in2p3.fr/~photons/gps_alice.css" type="text/css">
b2a60966	9	<body>
b2a60966	10
c2583e52	11	<h1 class="page-header">
	12	Geometry & Materials
	13	</h1>
	14	<h1>
	15	Simulation
	16	</h1>
	17	The simulation is done in two steps, one which describes the detector geometry
	18	and material and one which does the particle tracking and stores the hits
e126816e	19	and digits in a <a href="http://root.cern.ch/root/html/TTree.html">TTree</a> itself written on a disk file. These two steps are
c2583e52	20	steered through the Config.C file(<a href="PHOSConfig_Central.C">example</a>),
	21	a root macro launched at the AliRoot prompt. To customize this file you must:
	22	<br><br>
	23	<ol>
	24	<li>
	25	select a file name for the root output:
e126816e	26	<pre class="code">
c2583e52	27	//=======================================================================
	28	// Create the output file
	29	sprintf(filename,"<b>myfilename</b>.root");
	30	</pre>
	31	</li>
	32	<li>
	33	Define your event generator and simulations parameters:
e126816e	34	<pre class="code">
c2583e52	35	AliGenCocktail *gener = new AliGenCocktail(); // Cocktail class
	36	gener->SetPtRange(.02,10.00); // Transverse momentum range
	37	gener->SetPhiRange(180.,360.); // Azimuthal angle range
	38	gener->SetYRange(-0.25,0.25); // Pseudorapidity range
	39	gener->SetOrigin(0,0,0); // Vertex position
	40	gener->SetSigma(0,0,5.6); // Sigma in (X,Y,Z) (cm) on IP position
	41	gener->Init(); // Initialize the generator
	42	</pre>
	43	</li>
	44	<li>
	45	Select the detector seen by the tracking:
e126816e	46	<pre class="code">
c2583e52	47	Int_t iPHOS=1; // PHOS is in
	48	Int_t iPMD=0; // PMD is out
	49	</pre>
	50	</li>
	51	<li>
	52	Create a PHOS object (<b>GPS2</b> is so far the unique configuration option, see below):
e126816e	53	<pre class="code">
c2583e52	54	if(iPHOS) {
	55	//=================== PHOS parameters ===========================
	56	AliPHOS *PHOS = new AliPHOSv0("PHOS","<b>GPS2</b>");
	57	</pre>
	58	</li>
	59	</ol>
	60	<p>
	61	You van now run the simulation by entering the following command at the aliroot prompt:
e126816e	62	<pre class="code">
c2583e52	63	aliroot> gAlice->Run(1,"PHOSConfig_Central.C");
c2583e52	64	</pre>
c2583e52	65	<h1>
	66	Geometry
	67	</h1>
	68	<h4>
	69	Definition
	70	</h4>
	71	PHOS consists of two distinct parts. The calorimeter, named EMCA, consists
	72	of the PbW04 crystals within their housing. The crystals are assembled
	73	in <i>fNModules</i> modules of <i>fNPhi </i>rows along the x-axis direction
	74	and <i>fNZ</i> modules along the z-axis direction. Since the total number
	75	of crystals and their layout within ALICE is presently (11/11/1999) not
	76	final it was decided to fully parametrize the geometry. A change in any
	77	of the three previously defined parameters will provide automatically a
	78	new layout of the modules.
	79	<br>The second part of PHOS is the charged particle identifier. Since until
	80	end of 2000 no decision will be taken on the final design of this element
	81	two or more versions can be considered. Today (11/11/1999) only one version
	82	is implemented and is named PPSD for PHOS Pre-Shower Detector. It consists
	83	of a first layer of <i>fNumberOfModulesPhi</i> x <i>fNumberOfModulesZ </i>gas
	84	detectors per PHOS module, each detectors being subdivided into <i>fNumberOfPadsPhi</i>
	85	x <i>fNumberOfPadsZ </i>gas cells, a Lead converter and a second layer
	86	of gas detectors identical to the first layer. This second part is positionned
	87	on top of the EMCA module.
	88	<p>
e126816e	89	The class <a href="./html/AliPHOSv0.html"> AliPHOSv0 </a> ( <a href="./html/AliPHOSv0_Tree.ps"> inheritance tree </a>)
c2583e52	90	describes this geometry. We have defined also a class
e126816e	91	<a href="./html/AliPHOSv1.html"> AliPHOSv1 </a> ( <a href="./html/AliPHOSv1_Tree.ps"> inheritance tree </a>)
c2583e52	92	which in addition contains the photodiode response and the light transport through the crystal.
c2583e52	93	<p>
e126816e	94	The parameters of the geometry are given in class <a href="./html/AliPHOSGeometry.html"> AliPHOSGeometry </a>( <a href="./html/AliPHOSGeometry_Tree.ps"> inheritance tree </a>)
c2583e52	95	<br><br>
65163b68	96	<center>
6596dd3e	97	<img SRC=" images/EMCinAlice.gif" ALT="Geant Tree for PHOS" >
b2a60966	98	<br><br>
	99	<b> Figure 1.a: </b> <i> GEANT Tree which describes the EMC-PHOS geometry </i>
	100	</center>
	101	<P>
	102	<center>
6596dd3e	103	<img SRC=" images/PPSDinAlice.gif" ALT="Geant Tree for PHOS" >
65163b68	104	<br><br>
b2a60966	105	<b> Figure 1.b: </b> <i> GEANT Tree which describes the PPSD-PHOS geometry </i>
65163b68	106	</center>
c2583e52	107	<h4>
	108	Implementation
	109	</h4>
	110	<p>
65163b68	111	<center>
e126816e	112	<img SRC="./images/aliphossimulation.gif" ALT="Geom/Simul class diagram" >
65163b68	113	<br><br>
	114	<b> Figure 2.: </b> <i> Class diagram for the geometry/simulation package </i>
	115	</center>
c2583e52	116	<p>
e126816e	117	<a href="./html/AliPHOS.html"><i><u>AliPHOS</u></i></a>: This is the base class. It derives from <i>AliDetector.
c2583e52	118	</i>It's only purpose is to describe the materials
	119	(à la <i>AliMC</i>) needed for the EMCA and PPSD construction.
	120	<p>
e126816e	121	<a href="./html/AliPHOSv0.html"><i><u>AliPHOSv4</u></i></a>: It derives from <i>AliPHOS</i>.
c2583e52	122	<br>
	123	<ul>
	124	<li>
	125	It sets up the geometry for the Root display (<i>AliPHOSv4::BuildGeometry()</i>)
	126	and for the GEANT tracking (<i>AliPHOSv4::CreateGeometry()</i>).
	127	</li>
	128	<li>
	129	It watches the tracks passing through the active media of EMCA and PPSD
	130	(<i>AliPHOSv4::StepManager()</i>).
	131	</li>
	132	<li>
	133	It stores the hits (<i>AliPHOSv4::AddHit()</i>), using the <i>AliPHOSHit</i>
	134	class.
	135	</li>
	136	<li>
	137	It stores the digits (<i>AliPHOSv4::FinishEvent()</i>), using the <i>AliPHOSDigit</i>
	138	class.
	139	</li>
	140	</ul>
	141	<p>
e126816e	142	<a href="./html/AliPHOSv1.html"><i><u>AliPHOSv1</u></i></a> : derives from <i>AliPHOSv0</i> and includes the light transport
c2583e52	143	in the crystal and the response of the PIN photodiode à la O. H. Oddland.
c2583e52	144	<p>
e126816e	145	<a href="./html/AliPHOSvFast.html"><i><u>AliPHOSvFast</u></i></a> : used for <a href="fastsimulation.html">fast simulation</a>.
c2583e52	146	<p>
e126816e	147	<a href="./html/AliPHOSGeometry.html"><i><u>AliPHOSGeometry</u></i></a> : It derives from <i>TObject</i> to make it
c2583e52	148	persistent. It is a singleton, i.e., a pointer to the unique instance of
c2583e52	149	this class is obtained by:
65163b68	150	<center>
c2583e52	151	<pre class="code">
	152	AliPHOSGeometry * Geom = AliPHOSGeometry::GetInstance()
	153	</pre>
	154	</center>
	155	<ul>
	156	<li>
	157	It sets the various parameters for the geometry description and provides
	158	the method to access all the parameters. To avoid cumbersome macros at
	159	run time these parameters can only be changed manually in the source code.
	160	</li>
	161	<li>
	162	It provides the method to convert the absolute detector Id (crystal in
	163	EMCA or pad in PPSD) into a relative Id : PHOS module number, PPSD module
	164	number, row, column (<i>AliPHOSGeometry::AbsToRelNumbering()</i>) and the
	165	reverse operation (<i>AliPHOSGeometry::RelToAbsNumbering()</i>).
	166	</li>
	167	<li>
	168	It provides the method to convert an absolute Id into a three-vector giving
	169	the position of the detector in ALICE (<i>AliPHOSGeometry::RelPosInAlice()</i>).
	170	</li>
	171	</ul>
	172	<p>
e126816e	173	<a href="./html/AliPHOSHit.html"><i><u>AliPHOSHit</u></i></a>: It derives from <i>AliHit</i>. It stores the
c2583e52	174	hits as the pair (absolute Id, deposited energy). The hits presently are stored in the hit TTree
	175	as one hit per elementary cell (EMC crystal or PPSD gas cell) (See the
	176	the AddHit() method in <i>AliPHOSv0</i>).
	177	<p>
e126816e	178	<a href="./html/AliPHOSDigit.html"><i><u>AliPHOSDigit</u></i></a> : It derives from <i>AliDigit</i>. It stores
e126816e	179	the digits as the pair (absolute Id, energy) in the digit Tree (see
c2583e52	180	the FinishEvent() method in <i>AliPHOSv0</i>).
	181	<h1>
	182	Usage
	183	</h1>
	184	<p>
	185	<pre class="code">
	186	Int_t iPHOS=1;
	187	if(iPHOS) {
	188	AliPHOS * phos = new AliPHOSv4("PHOS", char * name) ;
	189	</pre>
	190	<br>
	191	where name can take the following values:
	192	<ul>
	193	<li>
	194	<i>GPS2</i>: will create EMCA plus PPSD
	195	<br><br>
	196	<center>
6596dd3e	197	<img SRC="images/AliPHOSv0AllViews.gif" ALT="ROOT display of PHOS: All Views" >
b2a60966	198	<b> Figure 3a.: </b> <i> ROOT Display of ALICE: All Views </i>
c2583e52	199	<p>
	200	<img SRC="images/AliPHOSv0FrontView.gif" ALT="ROOT display of PHOS: Front View" >
	201	<b> Figure 3b.: </b> <i> ROOT Display of ALICE: Front Views </i>
	202	<p>
	203	<img SRC="images/AliPHOSv03DView1.gif" ALT="ROOT display of PHOS: 3D View" >
	204	<b> Figure 3c.: </b> <i> ROOT Display of ALICE: All View3 </i>
	205	<p>
	206	<img SRC="images/AliPHOSv0PPSDFrontView.gif" ALT="Zoom on PPSD: Front View " >
	207	<b> Figure 4.a: </b> <i> ROOT Display of ALICE: zoom on PPSD, Front Views </i>
	208	<p>
	209	<img SRC="images/AliPHOSv0PPSDPerspectiveView.gif" ALT="Zoom on PPSD: Perspective View " >
	210	<b> Figure 4.b: </b> <i> ROOT Display of ALICE: zoom on PPSD, Perspective View </i>
65163b68	211	</center> <br><br>
c2583e52	212	</li>
	213	<li>
	214	more to come from Protvino (EMCA plus other CPV type)</li>
	215	</ul>
	216	<br>
	217	EMCA consists of 5 modules of 64x64 modules each, positionned at
	218	azimuthal angles -40, -20, 0, +20, +40 (see figures). PPSD consists per
	219	EMCA module of 2 layers of 4x4 gas detectors each, each detector having
	220	24x24 gas cells.
65163b68	221	<hr>
	222	<address class="left">
	223	© <a href="mailto:schutz@in2p3.fr">>Groupe Photons Subatech (Yves SCHUTZ)</a>
	224	<a href="http://www-subatech.in2p3.fr/~photons/subatech/en_index.shtml">[Go
	225	to the GPS Home Page]</a>
	226	</address>
	227	<!-- Created: Wed Nov 17 12:16:58 CET 1999 -->
	228	<!-- hhmts start -->
e126816e	229	Last modified: Sun Mar 26 17:31:13 CEST 2000
65163b68	230	<!-- hhmts end -->
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65163b68	232
	233
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	235	</html>
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