3 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights
6 * Latest changes by Christian Holm Christensen <cholm@nbi.dk>
8 * See cxx source for full Copyright notice
10 /** @mainpage ALICE FMD Off-line code
15 - @ref base (see also @ref FMD_base)
16 - @ref sim (see also @ref FMD_sim)
17 - @ref rec (see also @ref FMD_rec)
18 - @ref util (see also @ref FMD_util)
22 @section intro Introduction:
24 This file contains a short overview of the FMD code. It is by no
25 means authoritative - only the code is good for that. However,
26 I'll try to explain things a bit here.
28 @section structure Structure:
30 There are 4 libraries build for the FMD. These are
32 - libFMDbase: This contains the basic stuff, like data classes and
34 - libFMDsim: This contains code used by the simulation only. That
35 includes the detector class AliFMD and it's derivatives. It
36 also contains the code for building the geometry, as well as the
37 digitisers and raw data writer.
38 - libFMDrec: Code needed for the reconstruction. This include the
39 reconstruction code itself, as well as a raw data reader.
40 - libFMDutil: This is a special library that contains various
41 utility classes for the FMD expert/developer/tester. It
42 includes code to read all data produced by the FMD, a simple
43 event display, and code to make fake calibration and alignment
44 data. This library is @e not loaded by aliroot
45 automatically. The user has to load it herself:
47 gSystem->Load("libFMDutil.so");
49 The content of these libraries is detailed more below.
51 @subsection base libFMDbase:
53 This currently (18th or March 2006) contains the classes
55 - AliFMDBaseDigit, AliFMDDigit, AliFMDSDigit: Base class for
56 digits, real digits, and summable digits. The are all data
57 classes that holds the ADC value(s) for a single strip.
58 - AliFMDBoolMap: A map of booleans, one for each strip.
59 - AliFMDUShortMap: A map of unsigned short integers, one for each
61 - AliFMDDetector, AliFMD1, AliFMD2, AliFMD3: 3 classes that holds
62 the parameters for each of the 3 FMD sub-detectors. These
63 derive from AliFMDDetector, and are managed by AliFMDGeometry.
64 Each of these also contains the translation from sensor
65 reference frame to global reference frame.
66 - AliFMDRing: Parameters for the FMD rings (inner and outer type).
67 These are managed by AliFMDGeometry.
68 - AliFMDGeometry: Manager of FMD geometry data. All code queries
69 this manager for geometry parameters, so that the data is always
71 - AliFMDParameters: Manager of FMD parameters, like calibration
72 parameters. This class fetches data from CDB if necessary.
73 All code queries this manager for parameters, so that the data
75 - AliFMDCalibPedestal, AliFMDCalibGain, AliFMDCalibSampleRate,
76 AliFMDAltroMapping: Containers of calibration parameters. These
77 correspond to the pedestal and its width, the gain of each
78 strip, the oversampling rate used in read-out, and the map from
79 hardware address to detector.
80 - AliFMDAltroIO, AliFMDAltroReader, AliFMDAltroWriter: Low-level
81 classes to do input/output on ALTRO formated buffers.
85 @subsection sim libFMDsim:
87 This currently (18th or March 2006) contains the classes
89 - AliFMDEdepMap: Cache of energy deposited and total number of
90 hits for each strip. The digitiser AliFMDDigitizer uses this to
91 store simulation data before making digits.
92 - AliFMDHit: A hit in the FMD active elements, as described by the
93 simulation back-end during transport.
94 - AliFMD, AliFMDv0, AliFMDv1: Simulation drivers for the FMD.
95 AliFMD is the base class. AliFMDv0 corresponds to a simulation
96 where no hits are created, but the material distribution is
97 right. AliFMDv1 is like AliFMDv0, except that hits are
99 - AliFMDGeometryBuilder: Build the FMD geometry in terms of TGeo
100 objects. The information for building the geometry is retrieved
102 - AliFMDBaseDigitizer, AliFMDDigitizer, AliFMDSDigitizer: Base
103 class for the digitisers. AliFMDDigitizer makes `real' digits
104 (AliFMDDigit) from hits, and AliFMDSDigitizer makes summable
106 - AliFMDRawWriter: Writes a pseudo raw data file from the digits
107 created by the digitisers. It uses the AliFMDAltroMapping from
108 AliFMDParameters to make the mapping from detector coordinates
109 to hardware addresses.
111 @subsection rec libFMDrec:
113 This currently (18th or March 2006) contains the classes
115 - AliFMDReconstructor: Reconstruct (in a naiive way) the charged
116 particle multiplicity in the FMD strips. This also writes an
117 AliESDFMD object to the ESD files (that class is in libESD).
119 - AliFMDRecPoint: Reconstructed point in the FMD. These objects
120 are made AliFMDReconstructor.
122 - AliFMDRawReader: Classes to read raw data files.
124 @subsection util libFMDutil:
126 This currently (18th or March 2006) contains the classes
128 - AliFMDInput, AliFMDInputHits, AliFMDInputDigits,
129 AliFMDInputSDigits, AliFMDInputRecPoints: Base class, and
130 concrete classes to read in FMD generated data. These provide a
131 simple and unified way of getting the data. Hooks are defined
132 to process hits, tracks, digits, and reconstructed points, as
133 well as geometry and ESD data. See for example the scripts
134 @c DrawHits.C, @c DrawHitsDigits.C, @c DrawHitsRecs.C, @c
135 DrawDigitsRecs.C in the @c FMD/scripts sub-directory.
137 - AliFMDDisplay: Simple event display for FMD data, including
138 hits, digits, reconstructed points and ESD data.
140 - AliFMDCalibFaker, AliFMDAlignFaker: Classes to write fake (or
141 dummy) calibration and alignment data. These derive from
144 @section quick Quick start
146 First, install ROOT. Then Install TGeant3:
151 > cvs -d :pserver:cvs@root.cern.ch:/user/cvs login
153 > cvs -d :pserver:cvs@root.cern.ch:/user/cvs co geant3
158 Now you can install AliRoot
161 > cvs -d :pserver:cvs@alisoft.cern.ch:/soft/cvsroot login
163 > cvs -d :pserver:cvs@alisoft.cern.ch:/soft/cvsroot co AliRoot
165 > export ALICE_TARGET=`root-config --arch`
166 > export ALICE=${HOME}/alice
167 > export ALICE_ROOT=${ALICE}/AliRoot
168 > export ALICE_LEVEL=new
169 > export LD_LIBRARY_PATH=${ALICE_ROOT}/lib/tgt_${ALICE_TERGET}:${LD_LIBRARY_PATH}
170 > export PATH=${ALICE_ROOT}/bin/tgt_${ALICE_TERGET}:${PATH}
171 > export G3SYS=${ALICE}/geant3
175 To simulate one event, do something like
178 > aliroot ${ALICE_ROOT}/FMD/Simulate.C
181 To reconstruct the generated event, do
183 > aliroot ${ALICE_ROOT}/FMD/Reconstruct.C
186 Now, open the file `AliESDs.root' in AliRoot, and browse through that.
188 @section authors Authors:
190 - Alla Maevskaya <Alla.Maevskaia@cern.ch>
191 - Christian Holm Christensen <cholm@nbi.dk>
193 /** @defgroup FMD_sim Simulation */
195 //____________________________________________________________________
197 // Manager class for the FMD - Base class.
198 // AliFMDv1, AliFMDv0, and AliFMDAlla
199 // provides concrete implementations.
200 // This class is sooooo crowded
202 #ifndef ALIDETECTOR_H
203 # include <AliDetector.h>
206 # include <TBranch.h>
215 //____________________________________________________________________
216 /** @class AliFMD AliFMD.h <FMD/AliFMD.h>
217 @brief Forward Multiplicity Detector based on Silicon wafers.
218 This class is the driver for especially simulation.
220 The Forward Multiplicity Detector consists of 3 sub-detectors FMD1,
221 FMD2, and FMD3, each of which has 1 or 2 rings of silicon sensors.
223 This is the base class for all FMD manager classes.
225 The actual code is done by various separate classes. Below is
226 diagram showing the relationship between the various FMD classes
227 that handles the simulation
230 +----------+ +----------+
231 | AliFMDv1 | | AliFMDv0 |
232 +----------+ +----------+
233 | | +-----------------+
234 +----+--------------+ +--| AliFMDDigitizer |
235 | | +-----------------+
236 | +---------------------+ |
237 | +--| AliFMDBaseDigitizer |<--+
238 V 1 | +---------------------+ |
239 +--------+<>--+ | +------------------+
240 | AliFMD | +--| AliFMDSDigitizer |
241 +--------+<>--+ +------------------+
242 1 | +---------------------+
243 +--| AliFMDReconstructor |
244 +---------------------+
248 This defines the interface for the various parts of AliROOT that
249 uses the FMD, like AliFMDSimulator, AliFMDDigitizer,
250 AliFMDReconstructor, and so on.
252 This is a concrete implementation of the AliFMD interface.
253 It is the responsibility of this class to create the FMD
256 This is a concrete implementation of the AliFMD interface.
257 It is the responsibility of this class to create the FMD
258 geometry, process hits in the FMD, and serve hits and digits to
261 This is the base class for the FMD simulation tasks. The
262 simulator tasks are responsible to implment the geoemtry, and
264 - AliFMDReconstructor
265 This is a concrete implementation of the AliReconstructor that
266 reconstructs pseudo-inclusive-multiplicities from digits (raw or
269 Calibration and geometry parameters are managed by separate
270 singleton managers. These are AliFMDGeometry and
271 AliFMDParameters. Please refer to these classes for more
272 information on these.
274 class AliFMD : public AliDetector
277 /** Default constructor. Do not use. */
279 /** Normal constructor
280 @param name Name of object.
281 @param title Title of object. */
282 AliFMD(const char *name, const char *title);
284 @param other Object to copy from */
285 AliFMD(const AliFMD& other);
288 /** Assignment operator
289 @param other Object to assign from
290 @return Reference to this object */
291 AliFMD& operator=(const AliFMD& other);
292 /** Wheter to make a detailed geometry
293 @param use If true, make detailed geometry */
294 void UseDetailed(Bool_t use=kTRUE) { fDetailed = use; }
297 /** @name GEometry ANd Tracking (GEANT :-) */
298 /** Define the geometry. This is done by asking the manager
299 AliFMDGeometry to construct the geometry. This in turn calls
300 AliFMDGeometryBuilder. */
301 virtual void CreateGeometry();
302 /** Create the tracking mediums used by the FMD. This associates
303 the tracking mediums defined with the FMD in the
304 TVirtualMCApplication (AliMC).
306 The defined mediums are
307 - @c FMD @c Si$ Silicon (active medium in sensors)
308 - @c FMD @c C$ Carbon fibre (support cone for FMD3 and vacuum pipe)
309 - @c FMD @c Al$ Aluminium (honeycomb support plates)
310 - @c FMD @c PCB$ Printed Circuit Board (FEE board with VA1_3)
311 - @c FMD @c Chip$ Electronics chips (currently not used)
312 - @c FMD @c Air$ Air (Air in the FMD)
313 - @c FMD @c Plastic$ Plastic (Support legs for the hybrid cards)
315 virtual void CreateMaterials();
316 /** Initialize this detector */
318 /** This member function is called when ever a track deposites
319 energy (or similar) in an FMD tracking medium. In this base
320 class this member function is pure abstract. In concrete
321 sub-classes, the member function may make hits or other
323 virtual void StepManager() = 0;
324 /** Called at the end of each simulation event. If the debug level
325 is high enough a list of @e bad hits is printed. */
326 virtual void FinishEvent();
330 /** @name Graphics and event display */
331 /** Build simple ROOT TNode geometry for event display. With the new
332 geometry modeller, TGeoManager, this seems rather redundant. */
333 virtual void BuildGeometry();
334 /** Draw a shaded view of the Forward multiplicity detector. This
335 isn't really useful anymore. */
336 virtual void DrawDetector();
337 /** Calculate the distance from the mouse to the FMD on the screen
339 virtual Int_t DistanceToPrimitive(Int_t px, Int_t py);
340 /** Store x, y, z of all hits in memory for display.
341 Normally, the hits are drawn using TPolyMarker3D - however, that
342 is not very useful for the FMD. Therefor, this member function
343 is overloaded to make TMarker3D, via the class AliFMDPoints.
344 AliFMDPoints is a local class.
345 @param track the track number to load the hits for */
346 virtual void LoadPoints(Int_t track);
350 /** @name Hit and digit management */
351 /* Create Tree branches for the FMD.
353 - @c H Make a branch of TClonesArray of AliFMDHit's
354 - @c D Make a branch of TClonesArray of AliFMDDigit's
355 - @c S Make a branch of TClonesArray of AliFMDSDigit's */
356 virtual void MakeBranch(Option_t *opt=" ");
357 /** Set the TClonesArray to read hits into.
358 @param b The branch to containn the hits */
359 virtual void SetHitsAddressBranch(TBranch *b);
360 /** Set branch address for the Hits, Digits, and SDigits Tree. */
361 virtual void SetTreeAddress();
362 /** Get the array of summable digits
363 @return summable digits */
364 virtual TClonesArray* SDigits() { return fSDigits; }
365 /** Reset the array of summable digits */
366 virtual void ResetSDigits();
367 /** Add a hit to the hits tree
369 @param vol Volume parameters, interpreted as
370 - ivol[0] [UShort_t ] Detector #
371 - ivol[1] [Char_t ] Ring ID
372 - ivol[2] [UShort_t ] Sector #
373 - ivol[3] [UShort_t ] Strip #
374 @param hits Hit information
375 - hits[0] [Float_t ] Track's X-coordinate at hit
376 - hits[1] [Float_t ] Track's Y-coordinate at hit
377 - hits[3] [Float_t ] Track's Z-coordinate at hit
378 - hits[4] [Float_t ] X-component of track's momentum
379 - hits[5] [Float_t ] Y-component of track's momentum
380 - hits[6] [Float_t ] Z-component of track's momentum
381 - hits[7] [Float_t ] Energy deposited by track
382 - hits[8] [Int_t ] Track's particle Id #
383 - hits[9] [Float_t ] Time when the track hit */
384 virtual void AddHit(Int_t track, Int_t *vol, Float_t *hits);
385 /** Add a hit to the list
387 @param detector Detector # (1, 2, or 3)
388 @param ring Ring ID ('I' or 'O')
389 @param sector Sector # (For inner/outer rings: 0-19/0-39)
390 @param strip Strip # (For inner/outer rings: 0-511/0-255)
391 @param x Track's X-coordinate at hit
392 @param y Track's Y-coordinate at hit
393 @param z Track's Z-coordinate at hit
394 @param px X-component of track's momentum
395 @param py Y-component of track's momentum
396 @param pz Z-component of track's momentum
397 @param edep Energy deposited by track
398 @param pdg Track's particle Id #
399 @param t Time when the track hit
400 @param len Track length through the material.
401 @param stopped Whether track was stopped or disappeared */
402 virtual AliFMDHit* AddHitByFields(Int_t track,
417 Bool_t stopped=kFALSE);
418 /** Add a digit to the Digit tree
420 - digits[0] [UShort_t] Detector #
421 - digits[1] [Char_t] Ring ID
422 - digits[2] [UShort_t] Sector #
423 - digits[3] [UShort_t] Strip #
424 - digits[4] [UShort_t] ADC Count
425 - digits[5] [Short_t] ADC Count, -1 if not used
426 - digits[6] [Short_t] ADC Count, -1 if not used
427 @param notused Not used */
428 virtual void AddDigit(Int_t *digits, Int_t* notused=0);
430 @param detector Detector # (1, 2, or 3)
431 @param ring Ring ID ('I' or 'O')
432 @param sector Sector # (For inner/outer rings: 0-19/0-39)
433 @param strip Strip # (For inner/outer rings: 0-511/0-255)
434 @param count1 ADC count (a 10-bit word)
435 @param count2 ADC count (a 10-bit word), or -1 if not used
436 @param count3 ADC count (a 10-bit word), or -1 if not used */
437 virtual void AddDigitByFields(UShort_t detector=0,
444 /** Add a digit to the Digit tree
446 - digits[0] [UShort_t] Detector #
447 - digits[1] [Char_t] Ring ID
448 - digits[2] [UShort_t] Sector #
449 - digits[3] [UShort_t] Strip #
450 - digits[4] [UShort_t] ADC Count
451 - digits[5] [Short_t] ADC Count, -1 if not used
452 - digits[6] [Short_t] ADC Count, -1 if not used */
453 virtual void AddSDigit(Int_t *digits);
454 /** add a summable digit - as coming from data
455 @param detector Detector # (1, 2, or 3)
456 @param ring Ring ID ('I' or 'O')
457 @param sector Sector # (For inner/outer rings: 0-19/0-39)
458 @param strip Strip # (For inner/outer rings: 0-511/0-255)
459 @param edep Energy deposited
460 @param count1 ADC count (a 10-bit word)
461 @param count2 ADC count (a 10-bit word), or -1 if not used
462 @param count3 ADC count (a 10-bit word), or -1 if not used */
463 virtual void AddSDigitByFields(UShort_t detector=0,
474 /** @name Digitisation */
475 /** Create a digitizer object
476 @param manager Digitization manager
477 @return a newly allocated AliFMDDigitizer */
478 virtual AliDigitizer* CreateDigitizer(AliRunDigitizer* manager) const;
479 /** Create AliFMDDigit's from AliFMDHit's. This is done by creating
480 an AliFMDDigitizer object, and executing it. */
481 virtual void Hits2Digits();
482 /** Create AliFMDSDigit's from AliFMDHit's. This is done by creating
483 an AliFMDSDigitizer object, and executing it. */
484 virtual void Hits2SDigits();
488 /** @name Raw data */
489 /** Turn digits into raw data. This uses the class AliFMDRawWriter
490 to do the job. Please refer to that class for more
492 virtual void Digits2Raw();
497 /** Browse this object
498 @param b Browser to show this object in */
499 void Browse(TBrowser* b);
502 /** Initialize hit array if not already done, and return pointert.
504 TClonesArray* HitsArray();
505 /** Initialize digit array if not already done, and return pointert.
506 @return Digit array */
507 TClonesArray* DigitsArray();
508 /** Initialize summable digit array if not already done, and return
510 @return Summable digit array */
511 TClonesArray* SDigitsArray();
513 TClonesArray* fSDigits; // Summable digits
514 Int_t fNsdigits; // Number of digits
515 Bool_t fDetailed; // Use detailed geometry
516 Bool_t fUseOld; // Use old approx geometry
517 Bool_t fUseAssembly; // Use divided volumes
520 kSiId, // ID index of Si medium
521 kAirId, // ID index of Air medium
522 kPlasticId, // ID index of Plastic medium
523 kPcbId, // ID index of PCB medium
524 kSiChipId, // ID index of Si Chip medium
525 kAlId, // ID index of Al medium
526 kCarbonId, // ID index of Carbon medium
527 kCopperId, // ID index of Copper Medium
528 kKaptonId // ID index of Kapton Medium
531 TObjArray* fBad; //! debugging - bad hits
533 ClassDef(AliFMD,11) // Base class FMD entry point
537 //____________________________________________________________________