proposal (pdf)
Beam profile monitor utilizes the azimuthal pattern of e+e- pairs measured in front of the luminosity monitor to obtain the geometrical information on the beam such as ratio of beam hight to width.
One possibility is to use the 3D pixel technology which allows an operation at high rate and high radiation environment as well as flexible geometry. Each sensor is active to the edges (within 100 microns).
This is a tentative arrangement of sensors on one side of the IR. Active area is from r=2 to 8.cm.The other side of the disk is facing IP.
One segment of the beam profile monitor.
