• Main INDEX
  • Monthly INDEX
  • PREV
  • NEXT

    User name Ulmer

    Log entry time 15:27:59 on April10,2000

    Entry number 38709

    keyword=Q^2=0.5 4He stats as of 15:20

    *********************************************************************

    Q2=.5 Helium

    The REALS constitute 1/2 of total T5 (i.e. half random/half real).
    So we need to get double original estimate of T5 to obtain required # reals.

    Run Number T5 Triggers Total T5 Triggers

    1211 1.0 1.0
    1212 1.0 2.0
    1213 1.0 3.0
    1214 1.0 4.0
    1216 1.0 5.0
    1217 1.0 6.0
    1218 1.0 7.0
    1219 1.0 8.0
    1220 1.0 9.0
    1221 1.0 10.0
    1222 1.0 11.0
    1223 1.0 12.0
    1225 1.0 13.0
    1226 1.0 14.0
    1227 1.0 15.0
    1228 1.0 16.0
    1229 1.0 17.0
    1230 1.0 18.0
    1233 1.0 19.0
    1234 1.0 20.0
    1235 1.0 21.0
    1236 1.0 22.0
    1239 1.0 23.0
    1240 1.0 24.0
    1241 1.0 25.0
    1242 1.0 26.0
    1243 1.0 27.0
    1246 1.0 28.0
    1247 1.0 29.0
    1248 1.0 30.0
    1249 1.0 31.0
    1250 1.0 32.0
    1251 1.0 33.0
    1253 1.0 34.0
    1254 1.0 35.0
    1255 1.0 36.0
    1256 1.0 37.0
    1257 1.0 38.0
    1258 1.0 39.0
    1259 0.5 39.5
    1261 1.0 40.5
    1262 1.3 41.8
    1263 1.3 43.1
    1264 1.3 44.4
    1265 1.0 45.4
    1266 0.4 45.8

    As of run 1268, the coincidence timing gate was reduced to 50 ns
    The new real/total ratio is (for 16 uA): 0.58

    1268 1.1 46.9

    The beam current for run 1269 increased to 22 uA
    The new real/total ratio is (for 22 uA): 0.52 - roughly where we started.

    1269 1.2 48.1
    1270 1.3 49.4
    1271 1.2 50.6
    1272 1.2 51.8
    1275 1.2 53.0
    1276 1.2 54.2
    1277 1.0 55.2
    1278 1.2 56.4
    1279 1.2 57.6
    1280 1.2 58.8
    1281 0.4 59.2
    1282 1.2 60.4
    1283 1.2 61.6
    1284 1.2 62.8
    1285 1.2 64.0
    1286 1.2 65.2
    .....

    OUR goal for 2.5% statistics: 254M!! (This accounts for beam pol of 0.63 and
    assumes 1/2 of all T5 are reals and is based on original number of 109M.)