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Dead channel study

Dead channel study. Atsushi Horikoshi Hideyuki Sakamoto. Checking scheme. Counting numbers of dead channels Dead channel = No events over 2.5 p.e. “Dead” is categorized by two VLPC dead = Also dead @ LED run Fiber dead = Alive @ LED run Total dead channel = VLPC dead + Fiber dead

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Dead channel study

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  1. Dead channel study Atsushi Horikoshi Hideyuki Sakamoto

  2. Checking scheme • Counting numbers of dead channels • Dead channel = No events over 2.5 p.e. • “Dead” is categorized by two • VLPC dead = Also dead @ LED run • Fiber dead = Alive @ LED run • Total dead channel = VLPC dead + Fiber dead • Fiber connection is based on Mapping table of jp-map12.xls

  3. VLPC dead • 40 channels were dead

  4. AFE#7,MCM=8,CHAN#1-32 • Dead • -3GeV/c mag off , no rotate • 1255,1257,1259,1272,1273 • 400MeV/c mag on , rotate 6° • 1344,1346,1348,1350,1352 • 400MeV/c mag on rotate 3° • 1384,1386,1389,1391,1393,1395,1397,1399 • 325MeV/c mag on , rotate 6° • 1374,1376,1377,1379,1381,1382,1401, • 1403,1405,1407,1408,1410,1411, • 1334,1336,1338,1340,1342 • 325MeV/c mag on , rotate 3° • 1334,1336,1338,1340,1342 • 250MeV/c mag on , rotate 6° • 1318,1320,1322,1324,1326,1328,1330,1332 • 250MeV/c mag on , rotate 3° • 1356,1358,1360,1361,1363,1365,1367,1368,1370,1372 • Alive • -3GeV/c rotate 6° • 1302,1303,1304,1306,1307,1309,1311,1312

  5. Fiber dead • Fiber dead : 2 fiber

  6. Summary • Dead channels are studied using beam run. • Dead channel= No events over 2.5 p.e. • VLPC dead = 40 channels • Channel#1-32 were all dead @AFE#107,MCM#8 • Fiber dead = 2 fibers • Total dead channel • 39(AFE)+2(fiber)+1(noisy)=42 ch

  7. Discussion • The reason of boad107 mcm8 (AFE2 dead) • The connection of LVDS cable? • The problem of AFE2 boad ? • The fiber dead is 2 fibers. (no fiber dead in StationD) • Total dead channel is 41ch , noisy channel is 1 ch

  8. Dead MCM • AFE2#=107 , mcm=8 , ch=1-32 • st1w , fiber# (AFE# , mcm# , ch#)

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