From: D0SFT::MSUPA::LAURENS "Philippe" 31-MAY-1995 22:37:52.13 Subj: new version of TRGMON has correction for diffractive events Michigan State University (517)355-8525, 31-MAY-1995 Bonjour a tous, You will find a new TEST version of TRGMON ($ TRGMON TEST). The new feature added this time is a double single diffraction correction to the slow Z luminosity. There is a new column in the luminosity page, and the global number reported on top of the screens is this corrected Slow Z luminosity quantity. You probably also noted the change of scale from E31 to E30 that happened about a week ago (by popular demand). Philippe ------------------------------------------------------------------------------- Luminosity Monitoring 31-MAY-95 17:47:22 Integr Time DBSC/SBSC: 5.0/ 5.0 s Global Event Transfer Rate: 97.35 Hz Level 1: Running Information: Fresh Global Level 1 Trigger Rate: 451.05 Hz Fast L0: 246.kHz SlowZ_L: 12.61 E30 Level 1.5 Input/Reject: 409.2 Hz/86.4 % Dead Beam X During Level 1.5: 1.1 % Time Since Last Initialize: 0 00:18:17 Events Transf Since: 52910 | Lum(L0 Slow Z) | Lum(Fast L0 Good) | Live |L1 Trig| Bunch |Lum Raw|Corrctd| Fract |Occupcy|L Deliv|L Used |Usd/Dlv|Crossng|Fracton| ------|----E30|----E30|------%|------%|----E30|----E30|------%|------%|------%| P1*A3 | 2.13| 2.11| 16.73| 88.87| 2.10| 1.71| 81.06| 80.92| 16.28| | | | | | | | | | | P2*A4 | 1.77| 1.75| 13.88| 83.76| 1.75| 1.41| 80.97| 80.89| 11.41| | | | | | | | | | | P3*A5 | 1.71| 1.69| 13.41| 82.72| 1.69| 1.36| 80.98| 80.92| 14.06| | | | | | | | | | | P4*A6 | 1.65| 1.64| 13.00| 81.76| 1.64| 1.33| 80.89| 80.92| 11.68| | | | | | | | | | | P5*A1 | 2.40| 2.37| 18.82| 91.56| 2.37| 1.92| 80.94| 80.99| 19.99| | | | | | | | | | | P6*A2 | 3.09| 3.05| 24.15| 95.85| 3.03| 2.45| 80.89| 81.02| 26.58| ----- | ------| ------| ------| ------| ------| ------| ------| ------| ------| Total | 12.75| 12.61| 100 | 87.42| 12.58| 10.18| 80.95| 80.94| 100 | ------------------------------------------------------------------------------- The general formula used for computing the luminosity is: crossing_rate L = - ------------- * Loge ( fraction_of_beam_X_with_no_interaction ) cross_section Lum(Slow Z Center) ================== Lum Raw ------- This is the raw luminosity computed from the L0 Slow |Z| < 120 cm. The crossing_rate is 1/6 of the overall beam X rate. The cross_section used is 49.1 millibarn (from Rich P.). The fraction_of_beam_X_with_no_interaction is computed for each bunch using the per bunch scalers for the Slow Z signal in the L1 Trigger Framework. The total at the bottom of the screen simply is the sum of the 6 bunch luminosities. Corrctd ------- This is the raw luminosity corrected for double single diffraction events. The formula used for the corrective term is (from Rich P. and Dan O.): Crossing_rate X_sect_SD * Lum X_sect_SD * Lum Delta_L = ------------ * Loge( 2 - exp( - --------------- ) ) - --------------- X_sect_MB 2 * Crossing_rate 2 * X_sect_MB where Crossing_rate is the beam crossing frequency (in fact the bunch crossing frequency) Lum is the luminosity being corrected (the per bunch lum) X_sect_MB is the L0 slow z cross section (49.1 mb) and X_sect_SD is the single diffraction cross section (7.5 mb) The total at the bottom of the screen simply is the sum of the 6 bunch luminosities. This number is the official luminosity used in the top part of this display (and of several others). Fract ----- This is the relative fraction of the total luminosity contributed by each bunch (based on the corrected luminosity). The total for this column at the bottom of the screen is the sum of the 6 bunch fractions, and should thus be 100 %. Occupcy ------- This is the ratio of the Slow Z rate over the bunch crossing rate for each bunch. The total for this column at the bottom of the screen is NOT the sum of the 6 percentages, but the overall occupancy of the L0 Slow Z scalers. Lum(Fast L0 Good) ================== L Deliv -------- This is the luminosity computed from the L0 Fast Z Good Scalers. The crossing_rate is 1/6 of the overall beam X rate. The cross_section used is 46.7 millibarn (from Jeff B.). The fraction_of_beam_X_with_no_interaction is computed for each bunch using the per bunch scalers for the Fast Z Good in the L1 Trigger Framework. The total at the bottom of the screen is the sum of the 6 bunch luminosities. L Used -------- This is the luminosity computed from the (L0 Fast Z Good)*(Live X) Scalers. The crossing_rate is the Live X rate per bunch. The cross_section used is 46.7 millibarn. The fraction_of_beam_X_with_no_interaction is computed for each bunch using the per bunch scalers for the Live Crossings and the (Fast Z Good)*(Live X) in the L1 Trigger Framework. The total at the bottom of the screen is the sum of the 6 bunch luminosities. Usd/Dlv ------- This is the ratio of the two previous columns: Luminosity Used / Delivered The total for this column at the bottom of the screen is NOT the sum NOR average of the 6 percentages, but the ratio of the Total luminosity used over the total luminosity delivered, both taken from the Fast Z signal. Live Crossing ============= This is the percentage of Live X for each bunch. This numbers should be uniformly distributed unless an unevenness in the bunch sizes starts making bigger bunches "mask off" smaller ones. The total for this column at the bottom of the screen is NOT the sum of the 6 percentages, but the overall Live X percentage. L1 Trig Fraction ================ This is the relative fraction of the total Level 1 Trigger Rate contributed by each bunch. The total for this column at the bottom of the screen is the sum of the 6 bunch fractions, and should thus be 100 %.