Notes - instrumentation/beam physics meeting - 9/28/04 by Stephen Pordes Instrumentation-Integration Meeting of 9/28/04 (the Wednesday meeting on Tuesday). Alexei Semenov presented his scheme for measuring batch by batch intensities in the MI - the BBIM. The talk is in the Beams Doc Database as document 1378. He uses a Resistive Wall Current Monitor Output (where, which, buffered or straight?) and integrates and disintegrates the pulse from each bunch with a (proposed) 5 ns delay (cable) between integration and disintegration. The integrator output is sampled with 12 bit resolution at 212 MHz (derived as 4x the MI RF); an output is considered either signal (+baseline) or baseline depending on a threshold; An FPGA is used to form the sum of the bunch intensities within 6 adjustable gates that define the batches. The baseline is dynamic - calculated over an adjustable number of samples. The algorithm for the baseline is still under consideration. The board has a TCLK decoder, an MDAT input (connected to the FPGA but not currently programmed), a reference marker and RF input and an ethernet connection. The intensity of each batch is provided plus a signal saying if there is (too much) beam where the pbar production batch should have been removed. Communication with ACNet is done via ethernet TCP/IP to an OAC. Alexei has a board with the DSP debugged and is working on the FPGA. Action items: (with initials of responsible party) simulate response to triangular pulses - 1, 2, 4, 10 and 15 ns at base..(AS). check needed infrastructure - space, power, signals at MI-60...(AM/SP) understand ACNet interface (including TCP/IP or UDP)...(??) Comments from the meeting: There should be one BBIM dedicated to NuMI Beam Permit and one available for general studies to reduce possibility of user error affecting the Beam Permit system. summary by Stephen Pordes