History of the TPC laser project --------------------------------- 1997 ---- March 13 first tests in the foil tent, using FOPI laser June first two diodes rasterplatten built August next two diodes camera PC newfocus1 (picodriver) October laser November ealing stages joulometer 26 diodes ordered, delivery time January December mirror holders pencil prototype test ealing installation and software joulometer test 1998 ---- January I/O card spectral composition tests field cage damage tests February cross etc beam splitter test diode prototype test; first scan lambda/2 test collimators tests mirror holder geometry measurements glueing mirrors mirror angle calibration March 3-9 CERN clean room hole positions mounting holders align on collimators; measure rays with camera laser mirrors replaced by prisms April newfocus4 May beam divergence after collimators diodes 301-312 on boards; scanned lens tests May 15-30 CERN test position wiring for diodes installation of diodes TPC response to laser on Aleph electronics/scope TPC response to laser; data laser2-2805-101.dat laser2-2805-102.dat thru collimators laser2-2805-103.dat laser2-2805-104.dat Observed: bad events from diodes, too low trigger threshold; changing June 15-24 CERN zone installation 18 beam 23 muon chambers installed 24 focus test 24 cross dismounted muon data: runs 49 June newfocus5 July last 14 diodes CERN zone flipper test in magnetic field September flipper festo October flipper festo installed at CERN festo works. Diodes don't. October 28-30 expedition with HPL,GE November CERN switches on 3 flippers installed camera installed (orgasmotron) 1999 ---- March 22-25 DPG Freiburg, laser poster ??? Practice switching etc August ??? Sep/Oct riding diode built/installed Oct/Nov 40 GeV Pb+Au run: diode electronics burns diode 1 and 3 laser in parallel 1 shot/burst with flipping for 1 week after that flippers OK, laser beam profile bad data ---- diodesxxx.dat, dioscaxxx.dat March in cleanroom -> hole positions, ray positions May in test position -> scope pictures, TPC special sector laser2-2805-101.dat ... 104, other files same conditions June/July 1998 -> muon tracks, Fe source, laser. run49... 118-126 laser run223 all 7 rays in sector 8 run229 same+muons run230 muon chambers at low r tracks from both targets run262 laser+MT+minb short shaping time (210 ns) run263 same with medium shaping time (350 ns) scan thru chambers: chamber run delay events 9 284 65 36 10 285 65 60 adjusted 10 286 63 crash 10 287 63 51 11 289 95 0 311 65 0 312 65 0 313 68 50 like mips 0 314 67 54 2 315 adjusted 2 316 65 52 2 317 adjusted 4 320 66 50 5 323 66 6 324 adjusted 6 325 66 changed focus 7 327 64 8 329 46 136 9 333 62 10 335 62 118 11 336 62-54 120 11 338 54 12 339 53 100 13 341 61 15 345 66 8 346 adjusted, magn. field 100 500 A 129 1000 A 158 2000 A 183 2500 A 8 347 44 2500 A 8 349 40 148 2500 A October 1998 8e 448 47 0 A 8e 449 adjusted 8e 450 100 2500 A 8e 451 0 A, same position November 1998 ? 497 73 0 A ? 498 51 0 A ? 499 ? 506 2500 A, GG +-10 V 1-50 GG +-0 V 57-107 GG +-20 V 116-166 GG +-40 V 174-224 GG +-60 V 232-282 GG +-80 V 290-340 GG +-50 V 348-402 GG +-70 V 407-457 GG +-45 V 463-513 GG +-55 V 523-573 GG +-65 V 579-629 GG +-75 V varied 508 938 0 A varied 509 50 858 varied 510 varied 1-50 2 Hz; see laser logbook 2 511 58-50 3800 automatic switching; volodya Background from orgasmotron: run 550 with everything, 551 without. 40 GeV run in 1999 ------------------ sector run HV/del events B comment ------------------------------------------------------------ November 8e 471 90/50 2000 overwritten... 8e,8g,9 740 ?? 13000 8g 743 90/x ?? focus optimization 8g 747 90/30 2500 full focus opti, non-zero supp 8g 748 90/30 ?? full focus opti 8g? 791-807 ?? first full in parallel with physics 1 808 ?? 9300 full 0 809 ?? 2100 full end of run 0 856 90/30 varying 8e 857 100/? varying scan 863 varying ? 160 GeV run in 2000 ------------------- monitoring 8e, 1/15 bursts, 10 events Oct 7/run 1327 - Oct 25/run 1489 corrected in run 1337, burst 182 absent in run 1405 sector run HV/del events B comment ------------------------------------------------------------ Sep 11 6 1039 90/40 30 ? 7 1040 90/45 198 ? 8a 1042 90/45 172 ? 8c 1041 90/45 197 ? Sep 13 7 1045 90/45 1717 off zero-sup 4 1046 90/45 2300 off zero-sup 10 1047 90/45 1200 on zero-sup Sep 25 10 1136 90/40,20 ? 10 1137 100/10 ? 10 1138 90/10 ? increased by polar 8a 1139 90/50 off 8a 1140 90/50 on 8e 1147 90/50 659 off 8e 1148 90/40 260 off 8e 1149 90/40 412 on, pos 4160 A 8i 1150 90/40 too high 8i 1151 90/50 335 8a 1152 90/50 390 8a 1153 90/50 410 8c 1154 90/50 665 on Oct 7 8c 1324 931 TPC mask study Oct 12 ? 1369 2362 Oct 19 8e 1431 90/25 552 8e 1433 90/25 1027 on, pos 8e 1434 90/25 polarity switch 8e 1435 90/25 1039 on, neg October 24, absolute runs i.e. diodes go on file; no magnetic field 8e 1459 90/25 1536 TPC with mask 8e 1460 90/25 ? TPC with mask 8e 1461 90/25 1111 8e 1462 90/25 ? 1 Hz; low light 8e 1463 90/25 516 moving rotmir ? 8e 1464 90/25 516 moving rotmir fixed unscrewed rotmir 6 1466 90/25 1083 high light 7 1467 90/35 863 high light 7 1468 90/45 1110 OK 8a 1469 90/50 1115 OK 8c 1470 90/50 1055 OK 8e 1471 90/25 1106 OK 8e 1472 90/25 1581 magnet ramping up positive magnetic field I = +4160 A 8e 1473 90/25 1115 OK 8c 1474 90/25 1102 high light 8a 1475 90/50 ? OK 7 1476 90/50 2168 OK November 2, absolute runs i.e. diodes go on file; no magnetic field 8e 1535 90/25 1539 11 1537 90/50 3881 12 1538 90/45,42 1572 14 1540 90/45 2120 2 1544 90/45,42 1918 5 1546 90/50 2131 6 1547 90/50 1445 7 1548 90/50 1971 8a 1549 90/50,53 2949 8c 1550 90/53,52 1311 8e 1551 90/25 1489 November 2, absolute runs i.e. diodes go on file; positive magnetic field I=4160 A 8e 1553 90/25 2559 11 1554 90/50 1226 12 1555 90/50,48 2092 14 1556 90/45,48 2006 2 1557 90/48,2,8,50 3383 5 1558 90/50,55 2924 6 1559 90/50,52 2286 7 1560 90/52 2056 8a 1561 90/54,52 2485 8c 1562 90/52,50 2747 once again, good runs in 2000 in new format ******************************************************************************* run sector V/d dt(ns) events B comment 1039 6 90/40 357 30 0 1040 7 90/45 373 198 0 1042 8a 90/45 373 172 0 1041 8c 90/45 373 197 0 1045 7 90/45 373 1717 0 zero-sup turned on 1046 4 90/45 373 2300 0 1047 10 90/45 373 1200 +4000 1137 10 100/10 293 659 0 1138 10 90/10 304 403 0 light increased 1139 8a 90/50 391 36 0 1140 8a 90/50 391 270 +4160 1147 8e 90/50 391 659 0 1148 8e 90/40 357 260 0 high light 1149 8e 90/40 357 412 +4160 1150 8i 90/40 357 69 +4160 high light 1151 8i 90/50 391 335 +4160 1152 8a 90/50 391 390 +4160 1153 8a 90/50 391 410 +4160 1154 8c 90/50 391 665 +4160 1431 8e 90/25 322 552 +4160 1433 8e 90/25 322 1027 +4160 1434 8e 90/25 322 8487 polarity switch 1435 8e 90/25 322 1039 -4160 absolute runs (diodes go on file) 1468 7 90/45 373 1110 0 1469 8a 90/50 391 1115 0 1470 8c 90/50 391 1055 0 1471 8e 90/25 322 1106 0 1472 8e 90/25 322 1581 ramping up 1473 8e 90/25 322 1115 +4160 1474 8c 90/25 322 1102 +4160 high light 1475 8a 90/50 391 1087 +4160 1476 7 90/50 391 2168 +4160 1535 8e 90/25 322 1539 0 1537 11 90/50 391 3881 0 1538 12 90/45,42 365 1572 0 1540 14 90/45 373 2120 0 1544 2 90/45,42 365 1918 0 1546 5 90/50 391 2131 0 1547 6 90/50 391 1445 0 1548 7 90/50 391 1971 0 1549 8a 90/50,53 401 2949 0 1550 8c 90/53,52 401 1311 0 1551 8e 90/25 322 1489 0 1553 8e 90/25 322 2559 +4160 1554 11 90/50 391 1226 +4160 1555 12 90/50,48 382 2092 +4160 1556 14 90/45,48 382 2006 +4160 1559 6 90/50,52 400 2286 +4160 1560 7 90/52 400 2056 +4160 1561 8a 90/54,52 400 2485 +4160 1562 8c 90/52,50 391 2747 +4160 *******************************************************************************