Notes - SBD status meeting - Oct 26, 2004 Present: Alberto M., Stephen P., Dave C., Jean S., Bob F., Alvin T., Fritz D. Action items - all have a deadline of beam startup except as noted by "*". A. existing MI SBD 1. Chandra will provide Bob Flora with emittance algorithm for 2.5 MHz 2. After discussion with Chandra, Bob will read the RF voltage for 2.5 MHz...(at the meeting we said there would be a fixed table of voltages) 3. It's OK for the bunch length to be specified in the mode (rather than being inferred from the read of some external device) 4. Use SBD00 for 2.5 MHz B. New Tev SBD (LeCroy scope software bug finally fixed) 1. Add saving the entire scope profile for the times specified by Jerry - end of p injection, end of pbar injection, flat-top and start of HEP,. This feature was in the previous version of the SBD (The every 30 minutes storage is already implemented. Is this 24/7 or just during HEP?) 2. Prepare a Document listing all the SBD variables. 3. Make one emittance calculation routine that does it correctly even if it is slower than 1 second. Alvin reported that progress is being made with Adam Para on the program. They are now using equal time intervals instead of action intervals; this helps with the stability of the algorithm(?). 4. Add a data ready state variable for the emittance calculation. 5. Retire the old emittance variables that relied on a naive calculation. ( Discuss with TeV people...) The new emittances have new names and there will also be phase space array vectors. ( I assume this means 72 numbers and 72 arrays, plus the two summed emittances and arrays.) *6. Consider the issue of synchronizing the data collection for the emittance calculations with a specific clock event for p, pbar injection, flattop, squeeze, etc. as is done for the flying wires. 7. Provide a minimal SBD viewer as was previous available in the MCR that allows seeing the 36 bunches and then zooming. This is intended to catch gross timing errors. *Consider adding some improvements such as the ability to click on the overall display to produce a secondary window with an exploded view +/- x ns around that point. *8. Think about a more sophisticated application for viewing the data in real time, perhaps based on Fritz's offline viewer. ( Was this just my imagination or was this mentioned? Jean) C. New MI SBD - We'll return to this once the things needed for turn on have been taken care up. However note that 1. New scope data in documents database doc 1400 - pictures of bunches on the pbar target after rotation. Stephen would like to add that he was wrong about the length of the MI bunches after rotation. The plots in beamsdoc 1400 show FWHM of 0.85 ns and a base of about 2 ns...(Count the 8 GS/s points) 2. Dave Capista talked with Dave McGinnis about the proton torpedo. Dave M. corrects the data to compensate for the inadequate BW of the scope and then fits with a Gaussian to get the 95% emittance. Dave M. suggests an intelligent new scope and then do the calculations in the scope itself. There was some discussion that there wouldn't be enough compute power there?