MI SDB meeting - Sep 21, 2004 Attending: Alvin, Valeri, Bob Flora, Stephen Pordes, Dave Capista, alberto, Jean, Chandra Next meeting: As required Action Items: 1) Get and distribute more spectra from after rotation, preferably a set of 81(82) - Chandra 2) Continue getting the old SBD ready for 2.5 mhz. (Bob, Chandra) 3) clarify which resistive wall monitor is used for which pulses and get the cable characteristics. - Stephen et al 4) Check if the trailing pulse structure is due to reflections - Stephen et al. 5) Get the timing for the bunch rotation process so as see how long there is to sample the data. 6) For pbar target pulse trains, it will be desirable to have both an average over the whole train and the variation during the train of the bunch length. Details: 1) Existing SBD and 2.5 MHZ. Bob and Chandra are making progress. Bob showed a GUI on the SBD frontend that will replace and greatly improve the current method for setting the modes via files. It also adds the flexibilty to change the harmonic number and how the data are sliced into different numbers of buckets. The only criticism is that it runs on the frontend and a some point, needs to be augmented by an application. The parameters will be settable via a parameter page but this is very awkward given the different modes (one mode per page?) Dave pointed out this is a perfect candidate for a Java application. Also, Brian Chase has something they use for the low level RF for a similar purpose which can probably be adapted. 2) Pulse shape after rotation and just before extraction to pbar target. a) Chanda showed an example pulse, the one he sent Alvin. It is typical, with a base width of 1.7 ns and a rms(?) of .4 na. Some pulses are <1.5 ns wide at the base. The sample pulse was a single sweep on a 2ghz BW scope with 8ghz sampling on a slipstacking cycle. This scope is better than the existing MI SBD scope and comparable to the new TEV SBD scope. The 81 to 82 pulses in a train vary in phase and in width. The bunch intensity is 6X10**12/81, which is ~7x10**10 or comparable to pbars in the Tev. b) The bunch rotation and extraction to the pbar target is a dynamic process and it wasn't clear how many sweeps one could make in order to improve the signal. The estimate was about 5-10 turns at 11 microseconds/turn The emittance is not a meaningful number, but bunch length is. c) Pbar production efficicncy is determined by the average over the train, but it's important to see the variation in bunch length and phase over the train in order to tune. d) Chandra was asked to get more sample pulses from Kyomi: a whole train would be very useful. 3) Proton Torpedo - This is just a scope with some software. Dave hasn't gotten an answer yet from Dave McGinnis. Alberto remembered that Dave gave a runii talk about 1.5 years ago. Jean will look for the talk.