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)
19 - @ref script (see also @ref FMD_script)
23 @section intro Introduction:
25 This file contains a short overview of the FMD code. It is by no
26 means authoritative - only the code is good for that. However,
27 I'll try to explain things a bit here.
29 @section structure Structure:
31 There are 4 libraries build for the FMD. These are
33 - libFMDbase: This contains the basic stuff, like data classes and
35 - libFMDsim: This contains code used by the simulation only. That
36 includes the detector class AliFMD and it's derivatives. It
37 also contains the code for building the geometry, as well as the
38 digitisers and raw data writer.
39 - libFMDrec: Code needed for the reconstruction. This include the
40 reconstruction code itself, as well as a raw data reader.
41 - libFMDutil: This is a special library that contains various
42 utility classes for the FMD expert/developer/tester. It
43 includes code to read all data produced by the FMD, a simple
44 event display, and code to make fake calibration and alignment
45 data. This library is @e not loaded by aliroot
46 automatically. The user has to load it herself:
48 gSystem->Load("libFMDutil.so");
50 The content of these libraries is detailed more below.
52 @subsection base libFMDbase:
54 This currently (18th or March 2006) contains the classes
56 - AliFMDBaseDigit, AliFMDDigit, AliFMDSDigit: Base class for
57 digits, real digits, and summable digits. The are all data
58 classes that holds the ADC value(s) for a single strip.
59 - AliFMDBoolMap: A map of booleans, one for each strip.
60 - AliFMDUShortMap: A map of unsigned short integers, one for each
62 - AliFMDDetector, AliFMD1, AliFMD2, AliFMD3: 3 classes that holds
63 the parameters for each of the 3 FMD sub-detectors. These
64 derive from AliFMDDetector, and are managed by AliFMDGeometry.
65 Each of these also contains the translation from sensor
66 reference frame to global reference frame.
67 - AliFMDRing: Parameters for the FMD rings (inner and outer type).
68 These are managed by AliFMDGeometry.
69 - AliFMDGeometry: Manager of FMD geometry data. All code queries
70 this manager for geometry parameters, so that the data is always
72 - AliFMDParameters: Manager of FMD parameters, like calibration
73 parameters. This class fetches data from CDB if necessary.
74 All code queries this manager for parameters, so that the data
76 - AliFMDCalibPedestal, AliFMDCalibGain, AliFMDCalibSampleRate,
77 AliFMDAltroMapping: Containers of calibration parameters. These
78 correspond to the pedestal and its width, the gain of each
79 strip, the oversampling rate used in read-out, and the map from
80 hardware address to detector.
81 - AliFMDAltroIO, AliFMDAltroReader, AliFMDAltroWriter: Low-level
82 classes to do input/output on ALTRO formated buffers.
86 @subsection sim libFMDsim:
88 This currently (18th or March 2006) contains the classes
90 - AliFMDEdepMap: Cache of energy deposited and total number of
91 hits for each strip. The digitiser AliFMDDigitizer uses this to
92 store simulation data before making digits.
93 - AliFMDHit: A hit in the FMD active elements, as described by the
94 simulation back-end during transport.
95 - AliFMD, AliFMDv0, AliFMDv1: Simulation drivers for the FMD.
96 AliFMD is the base class. AliFMDv0 corresponds to a simulation
97 where no hits are created, but the material distribution is
98 right. AliFMDv1 is like AliFMDv0, except that hits are
100 - AliFMDGeometryBuilder: Build the FMD geometry in terms of TGeo
101 objects. The information for building the geometry is retrieved
103 - AliFMDBaseDigitizer, AliFMDDigitizer, AliFMDSDigitizer: Base
104 class for the digitisers. AliFMDDigitizer makes `real' digits
105 (AliFMDDigit) from hits, and AliFMDSDigitizer makes summable
107 - AliFMDRawWriter: Writes a pseudo raw data file from the digits
108 created by the digitisers. It uses the AliFMDAltroMapping from
109 AliFMDParameters to make the mapping from detector coordinates
110 to hardware addresses.
112 @subsection rec libFMDrec:
114 This currently (18th or March 2006) contains the classes
116 - AliFMDReconstructor: Reconstruct (in a naiive way) the charged
117 particle multiplicity in the FMD strips. This also writes an
118 AliESDFMD object to the ESD files (that class is in libESD).
120 - AliFMDRecPoint: Reconstructed point in the FMD. These objects
121 are made AliFMDReconstructor.
123 - AliFMDRawReader: Classes to read raw data files.
125 @subsection util libFMDutil:
127 This currently (18th or March 2006) contains the classes
129 - AliFMDInput, AliFMDInputHits, AliFMDInputDigits,
130 AliFMDInputSDigits, AliFMDInputRecPoints: Base class, and
131 concrete classes to read in FMD generated data. These provide a
132 simple and unified way of getting the data. Hooks are defined
133 to process hits, tracks, digits, and reconstructed points, as
134 well as geometry and ESD data. See for example the scripts
135 @c DrawHits.C, @c DrawHitsDigits.C, @c DrawHitsRecs.C, @c
136 DrawDigitsRecs.C in the @c FMD/scripts sub-directory.
138 - AliFMDDisplay: Simple event display for FMD data, including
139 hits, digits, reconstructed points and ESD data.
141 - AliFMDCalibFaker, AliFMDAlignFaker: Classes to write fake (or
142 dummy) calibration and alignment data. These derive from
145 @section script Scripts
147 Most scripts live in @c FMD/scripts. The notiable exceptions are
148 @ref Simulate.C, @ref Reconstruct.C, and @ref Config.C
150 @section quick Quick start
152 First, install ROOT. Then Install TGeant3:
157 > cvs -d :pserver:cvs@root.cern.ch:/user/cvs login
159 > cvs -d :pserver:cvs@root.cern.ch:/user/cvs co geant3
164 Now you can install AliRoot
167 > cvs -d :pserver:cvs@alisoft.cern.ch:/soft/cvsroot login
169 > cvs -d :pserver:cvs@alisoft.cern.ch:/soft/cvsroot co AliRoot
171 > export ALICE_TARGET=`root-config --arch`
172 > export ALICE=${HOME}/alice
173 > export ALICE_ROOT=${ALICE}/AliRoot
174 > export ALICE_LEVEL=new
175 > export LD_LIBRARY_PATH=${ALICE_ROOT}/lib/tgt_${ALICE_TERGET}:${LD_LIBRARY_PATH}
176 > export PATH=${ALICE_ROOT}/bin/tgt_${ALICE_TERGET}:${PATH}
177 > export G3SYS=${ALICE}/geant3
181 To simulate one event, do something like
184 > aliroot ${ALICE_ROOT}/FMD/Simulate.C
187 To reconstruct the generated event, do
189 > aliroot ${ALICE_ROOT}/FMD/Reconstruct.C
192 Now, open the file `AliESDs.root' in AliRoot, and browse through that.
194 @section authors Authors:
196 - Alla Maevskaya <Alla.Maevskaia@cern.ch>
197 - Christian Holm Christensen <cholm@nbi.dk>
199 /** @defgroup FMD_sim Simulation */
201 //____________________________________________________________________
203 // Manager class for the FMD - Base class.
204 // AliFMDv1, AliFMDv0, and AliFMDAlla
205 // provides concrete implementations.
206 // This class is sooooo crowded
208 #ifndef ALIDETECTOR_H
209 # include <AliDetector.h>
212 # include <TBranch.h>
221 //____________________________________________________________________
222 /** @class AliFMD AliFMD.h <FMD/AliFMD.h>
223 @brief Forward Multiplicity Detector based on Silicon wafers.
224 This class is the driver for especially simulation.
226 The Forward Multiplicity Detector consists of 3 sub-detectors FMD1,
227 FMD2, and FMD3, each of which has 1 or 2 rings of silicon sensors.
229 This is the base class for all FMD manager classes.
231 The actual code is done by various separate classes. Below is
232 diagram showing the relationship between the various FMD classes
233 that handles the simulation
236 +----------+ +----------+
237 | AliFMDv1 | | AliFMDv0 |
238 +----------+ +----------+
239 | | +-----------------+
240 +----+--------------+ +--| AliFMDDigitizer |
241 | | +-----------------+
242 | +---------------------+ |
243 | +--| AliFMDBaseDigitizer |<--+
244 V 1 | +---------------------+ |
245 +--------+<>--+ | +------------------+
246 | AliFMD | +--| AliFMDSDigitizer |
247 +--------+<>--+ +------------------+
248 1 | +---------------------+
249 +--| AliFMDReconstructor |
250 +---------------------+
254 This defines the interface for the various parts of AliROOT that
255 uses the FMD, like AliFMDSimulator, AliFMDDigitizer,
256 AliFMDReconstructor, and so on.
258 This is a concrete implementation of the AliFMD interface.
259 It is the responsibility of this class to create the FMD
262 This is a concrete implementation of the AliFMD interface.
263 It is the responsibility of this class to create the FMD
264 geometry, process hits in the FMD, and serve hits and digits to
267 This is the base class for the FMD simulation tasks. The
268 simulator tasks are responsible to implment the geoemtry, and
270 - AliFMDReconstructor
271 This is a concrete implementation of the AliReconstructor that
272 reconstructs pseudo-inclusive-multiplicities from digits (raw or
275 Calibration and geometry parameters are managed by separate
276 singleton managers. These are AliFMDGeometry and
277 AliFMDParameters. Please refer to these classes for more
278 information on these.
280 class AliFMD : public AliDetector
283 /** Default constructor. Do not use. */
285 /** Normal constructor
286 @param name Name of object.
287 @param title Title of object. */
288 AliFMD(const char *name, const char *title);
290 @param other Object to copy from */
291 AliFMD(const AliFMD& other);
294 /** Assignment operator
295 @param other Object to assign from
296 @return Reference to this object */
297 AliFMD& operator=(const AliFMD& other);
298 /** Wheter to make a detailed geometry
299 @param use If true, make detailed geometry */
300 void UseDetailed(Bool_t use=kTRUE) { fDetailed = use; }
303 /** @name GEometry ANd Tracking (GEANT :-) */
304 /** Define the geometry. This is done by asking the manager
305 AliFMDGeometry to construct the geometry. This in turn calls
306 AliFMDGeometryBuilder. */
307 virtual void CreateGeometry();
308 /** Create the tracking mediums used by the FMD. This associates
309 the tracking mediums defined with the FMD in the
310 TVirtualMCApplication (AliMC).
312 The defined mediums are
313 - @c FMD @c Si$ Silicon (active medium in sensors)
314 - @c FMD @c C$ Carbon fibre (support cone for FMD3 and vacuum pipe)
315 - @c FMD @c Al$ Aluminium (honeycomb support plates)
316 - @c FMD @c PCB$ Printed Circuit Board (FEE board with VA1_3)
317 - @c FMD @c Chip$ Electronics chips (currently not used)
318 - @c FMD @c Air$ Air (Air in the FMD)
319 - @c FMD @c Plastic$ Plastic (Support legs for the hybrid cards)
321 virtual void CreateMaterials();
322 /** Initialize this detector */
324 /** This member function is called when ever a track deposites
325 energy (or similar) in an FMD tracking medium. In this base
326 class this member function is pure abstract. In concrete
327 sub-classes, the member function may make hits or other
329 virtual void StepManager() = 0;
330 /** Called at the end of each simulation event. If the debug level
331 is high enough a list of @e bad hits is printed. */
332 virtual void FinishEvent();
336 /** @name Graphics and event display */
337 /** Build simple ROOT TNode geometry for event display. With the new
338 geometry modeller, TGeoManager, this seems rather redundant. */
339 virtual void BuildGeometry();
340 /** Draw a shaded view of the Forward multiplicity detector. This
341 isn't really useful anymore. */
342 virtual void DrawDetector();
343 /** Calculate the distance from the mouse to the FMD on the screen
345 virtual Int_t DistanceToPrimitive(Int_t px, Int_t py);
346 /** Store x, y, z of all hits in memory for display.
347 Normally, the hits are drawn using TPolyMarker3D - however, that
348 is not very useful for the FMD. Therefor, this member function
349 is overloaded to make TMarker3D, via the class AliFMDPoints.
350 AliFMDPoints is a local class.
351 @param track the track number to load the hits for */
352 virtual void LoadPoints(Int_t track);
356 /** @name Hit and digit management */
357 /* Create Tree branches for the FMD.
359 - @c H Make a branch of TClonesArray of AliFMDHit's
360 - @c D Make a branch of TClonesArray of AliFMDDigit's
361 - @c S Make a branch of TClonesArray of AliFMDSDigit's */
362 virtual void MakeBranch(Option_t *opt=" ");
363 /** Set the TClonesArray to read hits into.
364 @param b The branch to containn the hits */
365 virtual void SetHitsAddressBranch(TBranch *b);
366 /** Set branch address for the Hits, Digits, and SDigits Tree. */
367 virtual void SetTreeAddress();
368 /** Get the array of summable digits
369 @return summable digits */
370 virtual TClonesArray* SDigits() { return fSDigits; }
371 /** Reset the array of summable digits */
372 virtual void ResetSDigits();
373 /** Add a hit to the hits tree
375 @param vol Volume parameters, interpreted as
376 - ivol[0] [UShort_t ] Detector #
377 - ivol[1] [Char_t ] Ring ID
378 - ivol[2] [UShort_t ] Sector #
379 - ivol[3] [UShort_t ] Strip #
380 @param hits Hit information
381 - hits[0] [Float_t ] Track's X-coordinate at hit
382 - hits[1] [Float_t ] Track's Y-coordinate at hit
383 - hits[3] [Float_t ] Track's Z-coordinate at hit
384 - hits[4] [Float_t ] X-component of track's momentum
385 - hits[5] [Float_t ] Y-component of track's momentum
386 - hits[6] [Float_t ] Z-component of track's momentum
387 - hits[7] [Float_t ] Energy deposited by track
388 - hits[8] [Int_t ] Track's particle Id #
389 - hits[9] [Float_t ] Time when the track hit */
390 virtual void AddHit(Int_t track, Int_t *vol, Float_t *hits);
391 /** Add a hit to the list
393 @param detector Detector # (1, 2, or 3)
394 @param ring Ring ID ('I' or 'O')
395 @param sector Sector # (For inner/outer rings: 0-19/0-39)
396 @param strip Strip # (For inner/outer rings: 0-511/0-255)
397 @param x Track's X-coordinate at hit
398 @param y Track's Y-coordinate at hit
399 @param z Track's Z-coordinate at hit
400 @param px X-component of track's momentum
401 @param py Y-component of track's momentum
402 @param pz Z-component of track's momentum
403 @param edep Energy deposited by track
404 @param pdg Track's particle Id #
405 @param t Time when the track hit
406 @param len Track length through the material.
407 @param stopped Whether track was stopped or disappeared */
408 virtual AliFMDHit* AddHitByFields(Int_t track,
423 Bool_t stopped=kFALSE);
424 /** Add a digit to the Digit tree
426 - digits[0] [UShort_t] Detector #
427 - digits[1] [Char_t] Ring ID
428 - digits[2] [UShort_t] Sector #
429 - digits[3] [UShort_t] Strip #
430 - digits[4] [UShort_t] ADC Count
431 - digits[5] [Short_t] ADC Count, -1 if not used
432 - digits[6] [Short_t] ADC Count, -1 if not used
433 @param notused Not used */
434 virtual void AddDigit(Int_t *digits, Int_t* notused=0);
436 @param detector Detector # (1, 2, or 3)
437 @param ring Ring ID ('I' or 'O')
438 @param sector Sector # (For inner/outer rings: 0-19/0-39)
439 @param strip Strip # (For inner/outer rings: 0-511/0-255)
440 @param count1 ADC count (a 10-bit word)
441 @param count2 ADC count (a 10-bit word), or -1 if not used
442 @param count3 ADC count (a 10-bit word), or -1 if not used */
443 virtual void AddDigitByFields(UShort_t detector=0,
450 /** Add a digit to the Digit tree
452 - digits[0] [UShort_t] Detector #
453 - digits[1] [Char_t] Ring ID
454 - digits[2] [UShort_t] Sector #
455 - digits[3] [UShort_t] Strip #
456 - digits[4] [UShort_t] ADC Count
457 - digits[5] [Short_t] ADC Count, -1 if not used
458 - digits[6] [Short_t] ADC Count, -1 if not used */
459 virtual void AddSDigit(Int_t *digits);
460 /** add a summable digit - as coming from data
461 @param detector Detector # (1, 2, or 3)
462 @param ring Ring ID ('I' or 'O')
463 @param sector Sector # (For inner/outer rings: 0-19/0-39)
464 @param strip Strip # (For inner/outer rings: 0-511/0-255)
465 @param edep Energy deposited
466 @param count1 ADC count (a 10-bit word)
467 @param count2 ADC count (a 10-bit word), or -1 if not used
468 @param count3 ADC count (a 10-bit word), or -1 if not used */
469 virtual void AddSDigitByFields(UShort_t detector=0,
480 /** @name Digitisation */
481 /** Create a digitizer object
482 @param manager Digitization manager
483 @return a newly allocated AliFMDDigitizer */
484 virtual AliDigitizer* CreateDigitizer(AliRunDigitizer* manager) const;
485 /** Create AliFMDDigit's from AliFMDHit's. This is done by creating
486 an AliFMDDigitizer object, and executing it. */
487 virtual void Hits2Digits();
488 /** Create AliFMDSDigit's from AliFMDHit's. This is done by creating
489 an AliFMDSDigitizer object, and executing it. */
490 virtual void Hits2SDigits();
494 /** @name Raw data */
495 /** Turn digits into raw data. This uses the class AliFMDRawWriter
496 to do the job. Please refer to that class for more
498 virtual void Digits2Raw();
503 /** Browse this object
504 @param b Browser to show this object in */
505 void Browse(TBrowser* b);
508 /** Initialize hit array if not already done, and return pointert.
510 TClonesArray* HitsArray();
511 /** Initialize digit array if not already done, and return pointert.
512 @return Digit array */
513 TClonesArray* DigitsArray();
514 /** Initialize summable digit array if not already done, and return
516 @return Summable digit array */
517 TClonesArray* SDigitsArray();
519 TClonesArray* fSDigits; // Summable digits
520 Int_t fNsdigits; // Number of digits
521 Bool_t fDetailed; // Use detailed geometry
522 Bool_t fUseOld; // Use old approx geometry
523 Bool_t fUseAssembly; // Use divided volumes
526 kSiId, // ID index of Si medium
527 kAirId, // ID index of Air medium
528 kPlasticId, // ID index of Plastic medium
529 kPcbId, // ID index of PCB medium
530 kSiChipId, // ID index of Si Chip medium
531 kAlId, // ID index of Al medium
532 kCarbonId, // ID index of Carbon medium
533 kCopperId, // ID index of Copper Medium
534 kKaptonId // ID index of Kapton Medium
537 TObjArray* fBad; //! debugging - bad hits
539 ClassDef(AliFMD,11) // Base class FMD entry point
543 //____________________________________________________________________