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| 17 | <P STYLE="margin-top: 0.42cm; margin-bottom: 0.5cm; page-break-after: avoid"> |
| 18 | <FONT FACE="Albany, sans-serif"><FONT SIZE=4>============================================================================</FONT></FONT></P> |
| 19 | <P STYLE="margin-top: 0.42cm; margin-bottom: 0.5cm; page-break-after: avoid"> |
| 20 | <FONT FACE="Albany, sans-serif"><FONT SIZE=4>Description of ALICE |
| d6882b38 |
21 | Silicon Drift Detector (SDD) Code (Rev. 2 — May, 17<SUP>th</SUP> |
| 22 | 2008 — F. Prino)</FONT></FONT></P> |
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23 | <P STYLE="margin-top: 0.42cm; margin-bottom: 0.5cm; page-break-after: avoid"> |
| 24 | <FONT FACE="Albany, sans-serif"><FONT SIZE=4>============================================================================</FONT></FONT></P> |
| 25 | <P STYLE="margin-bottom: 0cm"><A NAME="Content"></A><STRONG><FONT SIZE=4 STYLE="font-size: 16pt">Content</FONT></STRONG> |
| 26 | </P> |
| 27 | <P STYLE="margin-bottom: 0cm"><BR> |
| 28 | </P> |
| 29 | <OL> |
| 30 | <LI><P STYLE="margin-bottom: 0cm"><A HREF="#punto 1">SDD module |
| 31 | geometrical description</A></P> |
| 32 | <LI><P STYLE="margin-bottom: 0cm"><A HREF="#punto 2">Simulation</A></P> |
| 33 | <LI><P STYLE="margin-bottom: 0cm"><A HREF="#punto 3">Local |
| 34 | Reconstruction</A></P> |
| 35 | <LI><P STYLE="margin-bottom: 0cm"><A HREF="#punto 4">Calibration |
| 36 | files (OCDB)</A></P> |
| 37 | <LI><P STYLE="margin-bottom: 0cm"><A HREF="#punto 5">ECS Run types |
| 38 | and DAs</A></P> |
| 39 | <LI><P STYLE="margin-bottom: 0cm"><A HREF="#punto 6">DCS data points</A></P> |
| 40 | </OL> |
| 41 | <P STYLE="margin-bottom: 0cm"><BR> |
| 42 | </P> |
| 43 | <P STYLE="margin-bottom: 0cm"><BR> |
| 44 | </P> |
| 45 | <P><A NAME="punto 1"></A><STRONG><A HREF="#Content" NAME="punto 1">SDD |
| 46 | module geometrical description</A></STRONG></P> |
| 47 | <P STYLE="margin-bottom: 0cm">SDD module geometrical description (= |
| 48 | anode numbering scheme, time bin definition, conversion from local |
| 49 | coordinates to detector coordinates) is managed by the |
| 50 | AliITSsegmentationSDD class. The detector is divided in 2 drift |
| 51 | regions along the drift direction (horizontal in the following |
| 52 | scheme).</P> |
| 53 | <P STYLE="margin-bottom: 0cm"><BR> |
| 54 | </P> |
| 55 | <P STYLE="margin-bottom: 0cm">Each drift region is read by 256 anodes |
| 56 | (anode pitch = 294 micrometers).</P> |
| 57 | <P STYLE="margin-bottom: 0cm">The anode signal is sampled every 25 |
| 58 | ns, this allows to measure the drift time of the charge produced by |
| 59 | the crossing particle.</P> |
| 60 | <P STYLE="margin-bottom: 0cm">The memory depth (= number of time |
| 61 | bins) is of 256 samplings per anode resulting in 6.4 microseconds of |
| 62 | maximum drift time.</P> |
| 63 | <P STYLE="margin-bottom: 0cm">Detector size (active region) along |
| 64 | anode axis = 256 * 294 microns = 75.264 mm</P> |
| 65 | <P STYLE="margin-bottom: 0cm">Detector size (active region) along |
| 66 | drift axis = 2 * 35.085 mm = 70.170 mm</P> |
| 67 | <PRE> microcables microcables |
| 68 | /\ /\ |
| 69 | || || |
| 70 | || || |
| 71 | || || |
| 72 | 0 256 0 |
| 73 | 0 |----------------------|---------------------| 511 |
| 74 | | time-bins | time-bins | |
| 75 | | a | a | |
| 76 | | n | n | |
| 77 | X <_|_o____________________|___________________o_|__ |
| 78 | | d | d | |
| 79 | | e LEFT SIDE | RIGHT SIDE e | |
| 80 | | s CHANNEL 0 | CHANNEL 1 s | |
| 81 | | Xlocal > 0 | Xlocal < 0 | |
| 82 | 255 |----------------------|---------------------| 256 |
| 83 | | |
| 84 | | |
| 85 | V |
| 86 | Z </PRE><P STYLE="margin-bottom: 0cm"> |
| 87 | <BR> |
| 88 | </P> |
| 89 | <P STYLE="margin-bottom: 0cm">=================================================================================================================</P> |
| 90 | <P STYLE="margin-bottom: 0cm"><BR> |
| 91 | </P> |
| 92 | <P STYLE="margin-bottom: 0cm"><BR> |
| 93 | </P> |
| 94 | <P><A NAME="punto 2"></A><STRONG><A HREF="#Content" NAME="punto 2">Simulation</A></STRONG></P> |
| 95 | <P STYLE="margin-bottom: 0cm">SDD digitization is implemented in the |
| 96 | AliITSsimulationSDD class and managed via the AliITSDetTypeSim class.</P> |
| 97 | <P STYLE="margin-bottom: 0cm"><BR> |
| 98 | </P> |
| 99 | <P STYLE="margin-bottom: 0cm">Working scheme:</P> |
| 100 | <P STYLE="margin-bottom: 0cm"><BR> |
| 101 | </P> |
| 102 | <P STYLE="margin-bottom: 0cm">1) Hits --> SDigits |
| 103 | (AliSimulation::RunSDigitization)</P> |
| 104 | <P STYLE="margin-bottom: 0cm">-> AliITS::Hits2SDigits |
| 105 | </P> |
| 106 | <P STYLE="margin-bottom: 0cm">-> AliITS::Hits2Predigits |
| 107 | </P> |
| 108 | <P STYLE="margin-bottom: 0cm">-> |
| 109 | AliITSsimulationSDD::SDigitiseModule</P> |
| 110 | <P STYLE="margin-bottom: 0cm">-> |
| 111 | AliITSsimulationSDD::HitsToAnalogDigits</P> |
| 112 | <P STYLE="margin-bottom: 0cm">- read hits, calculate anode and time |
| 113 | bin using drift speed from OCDB and AliITSsegmentationSDD class</P> |
| 114 | <P STYLE="margin-bottom: 0cm">- apply electron cloud diffusion |
| 115 | (gaussian smearing) along anode and drift directions, charge loss |
| 116 | during drift (set to zero)</P> |
| 117 | <P STYLE="margin-bottom: 0cm">-> |
| 118 | AliITSsimulationSDD::ChargeToSignal</P> |
| 119 | <P STYLE="margin-bottom: 0cm">- apply gain (from OCDB) to signal |
| 120 | </P> |
| 121 | <P STYLE="margin-bottom: 0cm">- sum the signal to the baseline (from |
| 122 | OCDB) value fluctuating with the</P> |
| 123 | <P STYLE="margin-bottom: 0cm">proper noise (from OCDB)</P> |
| 124 | <P STYLE="margin-bottom: 0cm">-> AliITSsimulationSDD::WriteSDigits</P> |
| 125 | <P STYLE="margin-bottom: 0cm">- call AliITS::AddSumDigit (which calls |
| 126 | AliITSDetTypeSim::AddSumDigit) to write SDigits (AliITSpListItem) to |
| 127 | file</P> |
| 128 | <P STYLE="margin-bottom: 0cm"><BR> |
| 129 | </P> |
| 130 | <P STYLE="margin-bottom: 0cm"><BR> |
| 131 | </P> |
| 132 | <P STYLE="margin-bottom: 0cm">2) SDigits --> Digits |
| 133 | (AliSimulation::RunDigitization)</P> |
| 134 | <P STYLE="margin-bottom: 0cm">-> AliITSDigitizer::Exec</P> |
| 135 | <P STYLE="margin-bottom: 0cm">- load SDigits</P> |
| 136 | <P STYLE="margin-bottom: 0cm">-> |
| 137 | AliITSsimulationSDD::FinishSDigitiseModule</P> |
| 138 | <P STYLE="margin-bottom: 0cm">-> AliITSsimulationSDD::FinishDigits</P> |
| 139 | <P STYLE="margin-bottom: 0cm">- check zero suppression option</P> |
| 140 | <P STYLE="margin-bottom: 0cm">-> AliITSsimulationSDD::Compress2D |
| 141 | (if zero supp is active)</P> |
| 142 | <P STYLE="margin-bottom: 0cm">- apply zero suppression</P> |
| 143 | <P STYLE="margin-bottom: 0cm">- compress signal from 10 to 8 bit</P> |
| 144 | <P STYLE="margin-bottom: 0cm">- subtract low threshold</P> |
| 145 | <P STYLE="margin-bottom: 0cm">- calculate expanded signal by |
| 146 | converting back from 8 to 10 bit</P> |
| 147 | <P STYLE="margin-bottom: 0cm">- store digit (by calling |
| 148 | AliITS::AddSimDigit which calls</P> |
| 149 | <P STYLE="margin-bottom: 0cm">AliITSDetTypeSim::AddSimDigit) both |
| 150 | compressed (8 bit, low threshold subtracted) and expanded (10 bit, |
| 151 | low threshold added)</P> |
| 152 | <P STYLE="margin-bottom: 0cm">-> |
| 153 | AliITSsimulationSDD::StoreAllDigits (if zero supp is not active)</P> |
| 154 | <P STYLE="margin-bottom: 0cm">- compress signal from 10 to 8 bit</P> |
| 155 | <P STYLE="margin-bottom: 0cm">- calculate expanded signal by |
| 156 | converting back from 8 to 10 bit</P> |
| 157 | <P STYLE="margin-bottom: 0cm">- store digit (by calling |
| 158 | AliITS::AddRealDigit which calls</P> |
| 159 | <P STYLE="margin-bottom: 0cm">AliITSDetTypeSim::AddRealDigit). Only |
| 160 | expanded (10 bit) value is stored in fSignal. TO BE CHECKED AND |
| 161 | FIXED!!!</P> |
| 162 | <P STYLE="margin-bottom: 0cm"><BR> |
| 163 | </P> |
| 164 | <P STYLE="margin-bottom: 0cm"><BR> |
| 165 | </P> |
| 166 | <P STYLE="margin-bottom: 0cm"><BR> |
| 167 | </P> |
| 168 | <P STYLE="margin-bottom: 0cm">========================================================================================================================</P> |
| 169 | <P STYLE="margin-bottom: 0cm"><BR> |
| 170 | </P> |
| 171 | <P><A NAME="punto 3"></A><STRONG><A HREF="#Content" NAME="punto 3">Local |
| 172 | Reconstruction</A></STRONG></P> |
| 173 | <P STYLE="margin-bottom: 0cm">Local reconstruction is implemented in |
| 174 | AliITSClusterFinderV2SDD class and managed via the AliITSDetTypeRec |
| 175 | class.</P> |
| 176 | <P STYLE="margin-bottom: 0cm"><BR> |
| 177 | </P> |
| 178 | <P STYLE="margin-bottom: 0cm">Working scheme:</P> |
| 179 | <P STYLE="margin-bottom: 0cm"><BR> |
| 180 | </P> |
| 181 | <P STYLE="margin-bottom: 0cm">Cluster Finding |
| 182 | (AliReconstruction::RunLocalEventReconstruction)</P> |
| 183 | <P STYLE="margin-bottom: 0cm">-> AliITSReconstructor::Reconstruct</P> |
| 184 | <P STYLE="margin-bottom: 0cm">-> |
| 185 | AliITSDetTypeRec::DigitsToRecPoints |
| 186 | </P> |
| 187 | <P STYLE="margin-bottom: 0cm">- Two possibilities:</P> |
| 188 | <P STYLE="margin-bottom: 0cm">A) RECONSTRUCTION FROM DIGITS</P> |
| 189 | <P STYLE="margin-bottom: 0cm">-> |
| 190 | AliITSClusterFinderV2SDD::FindRawClusters</P> |
| 191 | <P STYLE="margin-bottom: 0cm">- build AliBin array from digit tree</P> |
| 192 | <P STYLE="margin-bottom: 0cm">- apply gain (from OCDB) correction</P> |
| 193 | <P STYLE="margin-bottom: 0cm">B) RECONSTRUCTION FROM RAW DATA |
| 194 | </P> |
| 195 | <P STYLE="margin-bottom: 0cm">-> |
| 196 | AliITSClusterFinderV2SDD::RawdataToClusters</P> |
| 197 | <P STYLE="margin-bottom: 0cm">- instantiate AliITSRawStreamSDD object |
| 198 | and set</P> |
| 199 | <P STYLE="margin-bottom: 0cm">1) ddl map |
| 200 | </P> |
| 201 | <P STYLE="margin-bottom: 0cm">2) low threshold for zero suppression |
| 202 | (needed to decompress raw data)</P> |
| 203 | <P STYLE="margin-bottom: 0cm">- build AliBin array from raw data</P> |
| 204 | <P STYLE="margin-bottom: 0cm">- apply gain (from OCDB) correction</P> |
| 205 | <P STYLE="margin-bottom: 0cm">-> |
| 206 | AliITSClusterFinderV2SDD::FindClustersSDD</P> |
| 207 | <P STYLE="margin-bottom: 0cm">- loop on AliBin elements and:</P> |
| 208 | <P STYLE="margin-bottom: 0cm">1) apply noise suppression |
| 209 | (AliITSClusterFinderV2SDD::NoiseSuppress)</P> |
| 210 | <P STYLE="margin-bottom: 0cm">2) find peaks |
| 211 | (AliITSClusterFinderV2::FindPeaks)</P> |
| 212 | <P STYLE="margin-bottom: 0cm">3) unfold clusters |
| 213 | (AliITSClusterFinderV2::MarkPeaks)</P> |
| 214 | <P STYLE="margin-bottom: 0cm">4) calculate coordinates |
| 215 | (AliITSClusterFinderV2::MakeCluster)</P> |
| 216 | <P STYLE="margin-bottom: 0cm">5) calculate cluster size (TO BE |
| 217 | REVIEWED)</P> |
| 218 | <P STYLE="margin-bottom: 0cm">6) convert from anode/time bin to local |
| 219 | coordinates</P> |
| 220 | <P STYLE="margin-bottom: 0cm">using drift speed (from OCDB) and |
| 221 | AliITSsegmentationSDD class</P> |
| 222 | <P STYLE="margin-bottom: 0cm">7) apply correction from laser maps |
| 223 | (from OCDB)</P> |
| 224 | <P STYLE="margin-bottom: 0cm">8) convert cluster charge from ADC to |
| 225 | keV (from OCDB)</P> |
| 226 | <P STYLE="margin-bottom: 0cm">9) add cluster to cluster array</P> |
| 227 | <P STYLE="margin-bottom: 0cm"><BR> |
| 228 | </P> |
| 229 | <P STYLE="margin-bottom: 0cm"><BR> |
| 230 | </P> |
| 231 | <P STYLE="margin-bottom: 0cm"><BR> |
| 232 | </P> |
| 233 | <P STYLE="margin-bottom: 0cm">===============================================================================================================================</P> |
| 234 | <P STYLE="margin-bottom: 0cm"><BR> |
| 235 | </P> |
| 236 | <P><A NAME="punto 4"></A><STRONG><A HREF="#Content" NAME="punto 4">Calibration |
| 237 | Files (OCDB)</A></STRONG></P> |
| 238 | <P STYLE="margin-bottom: 0cm">There are 6 directories in ITS/Calib |
| 239 | with calibration data to be used in SDD reconstruction</P> |
| 240 | <P STYLE="margin-bottom: 0cm"><BR> |
| 241 | </P> |
| 242 | <P STYLE="margin-bottom: 0cm">1) DDLMapSDD</P> |
| 243 | <P STYLE="margin-bottom: 0cm">Contains: 1 AliITSDDLModuleMapSDD |
| 244 | object with the correspondence between hardware/online and |
| 245 | aliroot/offline numbering scheme for SDD modules</P> |
| 246 | <P STYLE="margin-bottom: 0cm">Online numbering scheme = DDL number, |
| 247 | Carlos Number |
| 248 | </P> |
| 249 | <P STYLE="margin-bottom: 0cm">SDD use 23 DDL each reading up to 12 |
| 250 | Carlos cards (=12 modules)</P> |
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251 | <P STYLE="margin-bottom: 0cm">Details on geometrical mapping can be found <A HREF="http://www.to.infn.it/~prino/alice/sddgeo/sddgeo.html">here</A>.</P> |
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252 | <P STYLE="margin-bottom: 0cm"><BR> |
| 253 | </P> |
| 254 | <P STYLE="margin-bottom: 0cm">Update in OCDB: every time the hardware |
| 255 | cabling on the acquisition cards is modified (practically this should |
| 256 | occur only at the beginning of data taking periods)</P> |
| 257 | <P STYLE="margin-bottom: 0cm">Object creation: macro StoreDDLMapSDD.C</P> |
| 258 | <P STYLE="margin-bottom: 0cm">strategy for storage via preprocessor |
| 259 | to be finalized |
| 260 | </P> |
| 261 | <P STYLE="margin-bottom: 0cm"><BR> |
| 262 | </P> |
| 263 | <P STYLE="margin-bottom: 0cm"><BR> |
| 264 | </P> |
| 265 | <P STYLE="margin-bottom: 0cm"><BR> |
| 266 | </P> |
| 267 | <P STYLE="margin-bottom: 0cm">2) CalibSDD: |
| 268 | </P> |
| 269 | <P STYLE="margin-bottom: 0cm">Contains: 1 TObjArray with 260 |
| 270 | AliITSCalibrationSDD objects, i.e. 1 AliITSCalibrationSDD object for |
| 271 | each module with:</P> |
| 272 | <P STYLE="margin-bottom: 0cm">- status (0/1) of module |
| 273 | </P> |
| 274 | <P STYLE="margin-bottom: 0cm">- status (0/1) for the 8 chips of the |
| 275 | module</P> |
| 276 | <P STYLE="margin-bottom: 0cm">- flag to control the use of correction |
| 277 | maps for the module</P> |
| 278 | <P STYLE="margin-bottom: 0cm">And:</P> |
| 279 | <P STYLE="margin-bottom: 0cm">- baseline</P> |
| 280 | <P STYLE="margin-bottom: 0cm">- noise</P> |
| 281 | <P STYLE="margin-bottom: 0cm">- gain</P> |
| 282 | <P STYLE="margin-bottom: 0cm">for each of the 520 anodes of the |
| 283 | module</P> |
| 284 | <P STYLE="margin-bottom: 0cm">+ list of bad anodes (TArrayI)</P> |
| 285 | <P STYLE="margin-bottom: 0cm">NOTE: bad anodes are tagged in 2 ways:</P> |
| 286 | <P STYLE="margin-bottom: 0cm">1) inserted in the TArrayI of bad anode |
| 287 | numbers</P> |
| 288 | <P STYLE="margin-bottom: 0cm">2) gain set to zero</P> |
| 289 | <P STYLE="margin-bottom: 0cm"><BR> |
| 290 | </P> |
| 291 | <P STYLE="margin-bottom: 0cm">Update in OCDB: after each sequence of |
| 292 | PEDESTAL+PULSER run and PEDESTAL run -> launch ITSSDDBASda.cxx</P> |
| 293 | <P STYLE="margin-bottom: 0cm">-> measure baselines and noise for |
| 294 | each anode</P> |
| 295 | <P STYLE="margin-bottom: 0cm">-> produce temporary output on LDC</P> |
| 296 | <P STYLE="margin-bottom: 0cm">PULSER run -> launch |
| 297 | ITSSDDGAINda.cxx</P> |
| 298 | <P STYLE="margin-bottom: 0cm">-> read output of PEDESTAL</P> |
| 299 | <P STYLE="margin-bottom: 0cm">-> measure gain from test pulse for |
| 300 | each anode</P> |
| 301 | <P STYLE="margin-bottom: 0cm">-> store baselines, noise and gain |
| 302 | on FXS</P> |
| 303 | <P STYLE="margin-bottom: 0cm"><BR> |
| 304 | </P> |
| 305 | <P STYLE="margin-bottom: 0cm">Simulated files can be produced with |
| 306 | the macro StoreCalibSDD.C</P> |
| 307 | <P STYLE="margin-bottom: 0cm"><BR> |
| 308 | </P> |
| 309 | <P STYLE="margin-bottom: 0cm"><BR> |
| 310 | </P> |
| 311 | <P STYLE="margin-bottom: 0cm">3) DriftSpeedSDD</P> |
| 312 | <P STYLE="margin-bottom: 0cm">Contains: 1 TObjArray of 520 |
| 313 | AliITSDriftSpeedArraySDD objects, i.e. 1 AliITSDriftSpeedArraySDD for |
| 314 | each drift region (hybrid).</P> |
| 315 | <P STYLE="margin-bottom: 0cm">The AliITSDriftSpeedArraySDD class |
| 316 | contains AliITSDriftSpeedSDD objects with polynomial coefficients of |
| 317 | fit to drift speed vs. anode number together with event number and |
| 318 | event timestamp.</P> |
| 319 | <P STYLE="margin-bottom: 0cm">It provides methods for interpolation |
| 320 | of drift speed vs. time.</P> |
| 321 | <P STYLE="margin-bottom: 0cm"><BR> |
| 322 | </P> |
| 323 | <P STYLE="margin-bottom: 0cm">Update in OCDB: 1) after an INJECTOR |
| 324 | run</P> |
| 325 | <P STYLE="margin-bottom: 0cm">-> launch ITSSDDINJda.cxx</P> |
| 326 | <P STYLE="margin-bottom: 0cm">-> measure drift speed for each |
| 327 | injector pad (33 drift speed determinations for each hybrid, at every |
| 328 | 8th anode)</P> |
| 329 | <P STYLE="margin-bottom: 0cm">2) after a PHYSICS run (if and when SDD |
| 330 | injector triggers will be implemented in the DAQ)</P> |
| 331 | <P STYLE="margin-bottom: 0cm"><BR> |
| 332 | </P> |
| 333 | <P STYLE="margin-bottom: 0cm">Simulated files can be produced with |
| 334 | the macro StoreDriftSpeedSDD.C</P> |
| 335 | <P STYLE="margin-bottom: 0cm"><BR> |
| 336 | </P> |
| 337 | <P STYLE="margin-bottom: 0cm"><BR> |
| 338 | </P> |
| 339 | <P STYLE="margin-bottom: 0cm"><BR> |
| 340 | </P> |
| 341 | <P STYLE="margin-bottom: 0cm">4) RespSDD</P> |
| 342 | <P STYLE="margin-bottom: 0cm">Contains: 1 AliITSresponseSDD object |
| 343 | with calibration parameters common to all modules:</P> |
| 344 | <P STYLE="margin-bottom: 0cm">- flag for zero suppressed data</P> |
| 345 | <P STYLE="margin-bottom: 0cm">- ADC to keV conversion factor for |
| 346 | detected signal</P> |
| 347 | <P STYLE="margin-bottom: 0cm">- time offset to account for various |
| 348 | delays in the measurement of drift time</P> |
| 349 | <P STYLE="margin-bottom: 0cm"><BR> |
| 350 | </P> |
| 351 | <P STYLE="margin-bottom: 0cm">Update in OCDB: from offline analysis |
| 352 | (time offset from alignemnt studies</P> |
| 353 | <P STYLE="margin-bottom: 0cm">ADC to keV from reconstructed poits of |
| 354 | cosmic tracks)</P> |
| 355 | <P STYLE="margin-bottom: 0cm"><BR> |
| 356 | </P> |
| 357 | <P STYLE="margin-bottom: 0cm">Simulated files can be produced with |
| 358 | the macro StoreCalibSDD.C</P> |
| 359 | <P STYLE="margin-bottom: 0cm"><BR> |
| 360 | </P> |
| 361 | <P STYLE="margin-bottom: 0cm"><BR> |
| 362 | </P> |
| 363 | <P STYLE="margin-bottom: 0cm"><BR> |
| 364 | </P> |
| 365 | <P STYLE="margin-bottom: 0cm">5) MapsAnodeSDD</P> |
| 366 | <P STYLE="margin-bottom: 0cm">Contains: 1 TObjArray of 520 |
| 367 | AliITSMapSDD objects, i.e. 1 AliITSMapSDD for each drift region |
| 368 | (hybrid) with systematic deviations between particle crossing |
| 369 | positions and reconstructed coordinates along anode axis</P> |
| 370 | <P STYLE="margin-bottom: 0cm">These residuals have been measured with |
| 371 | the laser by scanning the detector surface on a discrete 2D grid.</P> |
| 372 | <P STYLE="margin-bottom: 0cm"><BR> |
| 373 | </P> |
| 374 | <P STYLE="margin-bottom: 0cm">Update in OCDB: never updated, data |
| 375 | have been measured in the lab during the construction phase</P> |
| 376 | <P STYLE="margin-bottom: 0cm"><BR> |
| 377 | </P> |
| 378 | <P STYLE="margin-bottom: 0cm">Simulated files can be produced with |
| 379 | the macro StoreMapsSDD.C</P> |
| 380 | <P STYLE="margin-bottom: 0cm"><BR> |
| 381 | </P> |
| 382 | <P STYLE="margin-bottom: 0cm"><BR> |
| 383 | </P> |
| 384 | <P STYLE="margin-bottom: 0cm"><BR> |
| 385 | </P> |
| 386 | <P STYLE="margin-bottom: 0cm">6) MapsTimeSDD</P> |
| 387 | <P STYLE="margin-bottom: 0cm">Contains: 1 TObjArray of 520 |
| 388 | AliITSMapSDD objects, i.e. 1 AliITSMapSDD for each drift region |
| 389 | (hybrid) with systematic deviations between particle crossing |
| 390 | positions and reconstructed coordinates along drift axis</P> |
| 391 | <P STYLE="margin-bottom: 0cm">These residuals have been measured with |
| 392 | the laser by scanning the detector surface on a discrete 2D grid.</P> |
| 393 | <P STYLE="margin-bottom: 0cm"><BR> |
| 394 | </P> |
| 395 | <P STYLE="margin-bottom: 0cm">Update in OCDB: never updated, data |
| 396 | have been measured in the lab during the construction phase</P> |
| 397 | <P STYLE="margin-bottom: 0cm"><BR> |
| 398 | </P> |
| 399 | <P STYLE="margin-bottom: 0cm">Simulated files can be produced with |
| 400 | the macro StoreMapsSDD.C</P> |
| 401 | <P STYLE="margin-bottom: 0cm"><BR> |
| 402 | </P> |
| 403 | <P STYLE="margin-bottom: 0cm"><BR> |
| 404 | </P> |
| 405 | <P STYLE="margin-bottom: 0cm"><BR> |
| 406 | </P> |
| 407 | <P STYLE="margin-bottom: 0cm">========================================================================================================================</P> |
| 408 | <P STYLE="margin-bottom: 0cm"><BR> |
| 409 | </P> |
| 410 | <P STYLE="margin-bottom: 0cm">ECD Run Types and DAs</P> |
| 411 | <P STYLE="margin-bottom: 0cm">---------------------</P> |
| 412 | <P STYLE="margin-bottom: 0cm"><BR> |
| 413 | </P> |
| 414 | <P><A NAME="punto 5"></A><STRONG><A HREF="#Content" NAME="punto 5">ECS |
| 415 | Run Types available for SDD</A></STRONG></P> |
| 416 | <P STYLE="margin-bottom: 0cm">1) STANDALONE</P> |
| 417 | <P STYLE="margin-bottom: 0cm">- for test purposes</P> |
| 418 | <P STYLE="margin-bottom: 0cm">- no DA launched at EOR</P> |
| 419 | <P STYLE="margin-bottom: 0cm"><BR> |
| 420 | </P> |
| 421 | <P STYLE="margin-bottom: 0cm">2) PEDESTAL</P> |
| 422 | <P STYLE="margin-bottom: 0cm">- GOAL: measure baselines and noise</P> |
| 423 | <P STYLE="margin-bottom: 0cm">- JTAG configuration: zero-suppression |
| 424 | OFF</P> |
| 425 | <P STYLE="margin-bottom: 0cm">baseline equalization OFF</P> |
| 426 | <P STYLE="margin-bottom: 0cm">testpulse OFF</P> |
| 427 | <P STYLE="margin-bottom: 0cm">prepulse OFF</P> |
| 428 | <P STYLE="margin-bottom: 0cm">- DA: ITSSDDBASda.cxx (running on LDCs)</P> |
| 429 | <P STYLE="margin-bottom: 0cm">- uses AliITSOnlineSDDBase and |
| 430 | AliITSOnlineSDDCMN classes</P> |
| 431 | <P STYLE="margin-bottom: 0cm">- calculates baseline, noise and common |
| 432 | mode for each anode</P> |
| 433 | <P STYLE="margin-bottom: 0cm">- tags bad (= noisy + bad baseline) |
| 434 | anodes |
| 435 | </P> |
| 436 | <P STYLE="margin-bottom: 0cm"><BR> |
| 437 | </P> |
| 438 | <P STYLE="margin-bottom: 0cm">2) PULSER</P> |
| 439 | <P STYLE="margin-bottom: 0cm">- GOAL: measure gain |
| 440 | </P> |
| 441 | <P STYLE="margin-bottom: 0cm">- JTAG configuration: zero-suppression |
| 442 | OFF</P> |
| 443 | <P STYLE="margin-bottom: 0cm">baseline equalization OFF</P> |
| 444 | <P STYLE="margin-bottom: 0cm">testpulse ON</P> |
| 445 | <P STYLE="margin-bottom: 0cm">prepulse OFF</P> |
| 446 | <P STYLE="margin-bottom: 0cm">- DA: ITSSDDGAINda.cxx (running on |
| 447 | LDCs)</P> |
| 448 | <P STYLE="margin-bottom: 0cm">- uses AliITSOnlineSDDTP class</P> |
| 449 | <P STYLE="margin-bottom: 0cm">- read PEDESTAL DA output</P> |
| 450 | <P STYLE="margin-bottom: 0cm">- calculates gain for each anode</P> |
| 451 | <P STYLE="margin-bottom: 0cm">- sets anodes with problems of gain |
| 452 | (dead) as bad</P> |
| 453 | <P STYLE="margin-bottom: 0cm">- stores data to FXS</P> |
| 454 | <P STYLE="margin-bottom: 0cm"><BR> |
| 455 | </P> |
| 456 | <P STYLE="margin-bottom: 0cm">3) INJECTOR</P> |
| 457 | <P STYLE="margin-bottom: 0cm">- GOAL: measure drift speed</P> |
| 458 | <P STYLE="margin-bottom: 0cm">- JTAG configuration: zero-suppression |
| 459 | ON</P> |
| 460 | <P STYLE="margin-bottom: 0cm">baseline equalization ON</P> |
| 461 | <P STYLE="margin-bottom: 0cm">testpulse OFF</P> |
| 462 | <P STYLE="margin-bottom: 0cm">prepulse ON</P> |
| 463 | <P STYLE="margin-bottom: 0cm">- DA: ITSSDDINJda.cxx (running on LDCs)</P> |
| 464 | <P STYLE="margin-bottom: 0cm">- uses AliITSOnlineSDDInjectors class</P> |
| 465 | <P STYLE="margin-bottom: 0cm">- calculates drift speed for each of |
| 466 | the 33 groups of injectors</P> |
| 467 | <UL> |
| 468 | <LI><P STYLE="margin-bottom: 0cm">fits drift speed vs. anode with a |
| 469 | 3rd degree polynomial</P> |
| 470 | <LI><P STYLE="margin-bottom: 0cm">stores data to FXS</P> |
| 471 | </UL> |
| 472 | <P STYLE="margin-bottom: 0cm"><BR> |
| 473 | </P> |
| 474 | <P STYLE="margin-bottom: 0cm">4) PHYSICS</P> |
| 475 | <P STYLE="margin-bottom: 0cm">Nothing done for now.</P> |
| 476 | <P STYLE="margin-bottom: 0cm">If/when injector triggers will be |
| 477 | implemented in DAQ, a monitoring</P> |
| 478 | <P STYLE="margin-bottom: 0cm">DA will be prepared to calculated drift |
| 479 | speed for these triggers.</P> |
| 480 | <P STYLE="margin-bottom: 0cm"><BR> |
| 481 | </P> |
| 482 | <P STYLE="margin-bottom: 0cm">===========================================================================================================================</P> |
| 483 | <P STYLE="margin-bottom: 0cm"><BR> |
| 484 | </P> |
| 485 | <P><A NAME="punto 6"></A><STRONG><A HREF="#Content" NAME="punto 6">DCS |
| 486 | data points</A></STRONG></P> |
| 487 | <P STYLE="margin-bottom: 0cm">DCS data points are used for reference. |
| 488 | They are needed for a possible backup |
| 489 | </P> |
| 490 | <P STYLE="margin-bottom: 0cm">estimation of drift speed in case of |
| 491 | injector failure.</P> |
| 492 | <P STYLE="margin-bottom: 0cm"><BR> |
| 493 | </P> |
| 494 | <P STYLE="margin-bottom: 0cm">Values monitored (and stored every 2 |
| 495 | minutes + when out of confidence band) by SDD DCS:</P> |
| 496 | <P STYLE="margin-bottom: 0cm">- 260 HV values (1 for each module)</P> |
| 497 | <P STYLE="margin-bottom: 0cm">- 260 MV values (1 for each module)</P> |
| 498 | <P STYLE="margin-bottom: 0cm">- 520 temperature values (1 for each |
| 499 | hybrid)</P> |
| 500 | <P STYLE="margin-bottom: 0cm">Plus:</P> |
| 501 | <P STYLE="margin-bottom: 0cm">- 260 module status bits (1 for each |
| 502 | module)</P> |
| 503 | <P STYLE="margin-bottom: 0cm">- 520 temperature status bits (1 for |
| 504 | each hybrid)</P> |
| 505 | <P STYLE="margin-bottom: 0cm"><BR> |
| 506 | </P> |
| 507 | <P STYLE="margin-bottom: 0cm">Data treated by AliITSDCSAnalyzerSDD |
| 508 | class which:</P> |
| 509 | <P STYLE="margin-bottom: 0cm">- compress status bits into 1 byte</P> |
| 510 | <P STYLE="margin-bottom: 0cm">- reduce data size by saving values |
| 511 | only if out of confidence band with |
| 512 | </P> |
| 513 | <P STYLE="margin-bottom: 0cm">respect to last stored value</P> |
| 514 | <P STYLE="margin-bottom: 0cm">- store data into AliITSDCSDataSDD |
| 515 | objects for each module</P> |
| 516 | <P STYLE="margin-bottom: 0cm"><BR> |
| 517 | </P> |
| 518 | <P STYLE="margin-bottom: 0cm">Data stored in |
| 519 | Reference/ITS/DCS/DataSDD.</P> |
| 520 | <P STYLE="margin-bottom: 0cm">Object stored: 1 TClonesArray of 260 |
| 521 | AliITSDCSDataSDD (q for each module)</P> |
| 522 | </BODY> |
| d6882b38 |
523 | </HTML> |
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