How to access the output from TURBOIP

Up until last year the value for the beam angle and position in the LX tables came from a program called IPXXPR. This, basically, extrapolated from the pickup readings at the QS0s.

Last year a new program was developed called TURBOIP, this uses information from the QS0 and QS4 pickups. Data from this program was analysised by the experiments, and will be used to help establish the vertex position.

IPXXPR is thus redundant and its output will be supressed.

TURBOIP calculates from both left and right of the IP, resulting in two numbers per experiment. Views for each of the experiments have been created.

V_L3_TURBOIP

V_ALEPH_TURBOIP

V_OPAL_TURBOIP

V_DELPHI_TURBOIP

A select from any of these views will return TWO records with the following attributes:

timestamp,

side -- LEFT = 0 RIGHT = 1

x_p -- Positron horizontal position

xpr_p -- Positron horizontal angle

y_p -- Positron vertical position

ypr_p -- Positron vertical angle

x_e -- Electron horizontal position

xpr_e -- Electron horizontal angle

y_e -- Electron vertical position

ypr_e -- Electron vertical angle

Position is in microns, angle in microradians. Unlike IPXXPR no errors are returned.

(A lot of effort has gone into the analysis of the 95 results via the "Interaction Region" subgroup of the LEP2 workshop.)

Mike Lamont 14/3/96