1. RICH1 B-field Measurements Conclusions:
HPD image distortions in a magnetic field.
The RICH1 magnetic shield in place in the cavern
The RICH1 detector
Finite Element Model of the field in RICH 1
Vector field measurements
every 10 cm around the HPD plane.
Maximum field in HPD plane: 24 Gauss
Horizontal symmetry in the plane (1 Gauss)
L1 Trigger requirements on the magnetic field
Difference to model (Gauss)
Integrated B field:
Measured: 127 kGauss cm
Predicted: 138 kGauss cm
Conclusions:
Measurements 10-20% lower than FEA model predictions
Max field in HPD plane less than 24 Gauss (requirement less than 30 Gauss)