Minutes/Action items of "Instrumentation-Systems-SDA" monthly meeting January 7, 2009 ------------------------------------------------------------------------- D. Capista, M. Convery, K. Gollwitzer, A. Jansson, V. Lebedev, C. McClure, D. Morris, T. Meyer, V. Papadimitriou, L. Prost, D. Slimmer, D. Still, R. Thurman-Keup, D. Voy, M. Wendt, M.J.Yang, J. Zagel We discussed the following: -------------------------- 1) MI IPM status - D. Slimmer 2) MI IPM Acnet Interface - M. Denton 3) TeV IPM status - A. Jansson 4) Status of Flying Wire system (RR, MI and TeV) - J. Zagel, T. Meyer 5) RFT board status - C. McClure ------------------------------------------------------------------------------------ Conclusions-Action Items: 1) Dave has implemented Valeri's decaying sinusoidal fit to MI IPM data. The code is now running in the Magnetic (Mark II) IPM front end and filling 6 ACNET devices. The information reported is: data offset, amplitude, decay rate, frequency and phase, including the uncertainties of the above parameters and two chisquares. Dave showed the results of the decaying sinusoidal fit; The amplitude and frequency from the new fit match closely to the FFT plot calculated in the front end for many years. The next step is for Valeri to validate these fits. 2) Denton and Dave Capista have used Tom's IPM Acnet Interface page for the Main Injector which displays the front-end data on a console. (charge vs turn, sigma vs turn, position vs turn, etc.) Denton showed such plots from a recent store (6707). The data look reasonable. It has been noticed that the charge vs turn plot has to be scaled properly in ACNET. Denton has also tried to compare/correlate the sigmas of the Flying wires with the ones from the IPM for all 36 injected bunches. The two devices are at two different locations so the quantitative differences need to be better understood. The plan is to datalog the new IPM devices in order to make the data analysis easier. When the data is understood we will introduce into SDA as well. 3) Andreas has observed a jitter in timing signals of the TeV IPM for certain settings (eg. delay, phase, etc) in flattop/squeeze and he is investigating this further. He is also investigating shot to shot (acquisition to acquisition) amplitude variations. The reason for a previous observation indicating that the pbar signal was poor was traced to a bug in the background subtraction of the pbar data. The bug is now fixed and the pbar signal looks significantly improved. A new comparison of sigmas for Flying Wires and the TeV IPM will be attempted as well. 4) a) The vertical RR wire stopped moving around 10:30 pm on January 6. At the January 7 access it was determined that the vertical FW rotation was very stiff in parts of a move through 360 degrees. The motor was removed and replaced. The rotation is now slightly better and the control loop was tuned for better response. Eventually the lid should be replaced. b) We have an issue as well with MI Flying Wires during multibatch proton injection. for one of the two passes in the second batch (bad data or no data). This seems due to the fact that the processing of the data of the first fly is not complete before the second fly. Jim and Dave will continue investigating possible timing issues there. A recent problem with 8 GeV FW emittances was fixed by power cycling the MI VRFT. c) We still need to understand better the Tevatron bunch by bunch FW emittance evolution during the flattop and squeeze cases. We are now flying the wires two additional times during flattop (once before pbar jacking and once after pbar jacking) with the goal to compare clockwise to clockwise flights. We continue flying the wires in the beginning of the case flattop and in the end of the case squeeze. By analyzing data from the dataloggers and comparing the two clockwise flights Tom concluded that the bunch by bunch pbar emittances exhibit strange behaviour. This could be related to some machine changes that happen at the beginning of flattop (machine beam synch clock?). We would like to try many wire flys before the jagging begins to see if there is a time when the data starts looking better. d) The Horizontal E11 Tevatron Flying Wire was vibrating in the pbar beam on December 30th and caused the pbar beam to fall out. Jim replaced the motion drive amplifier and was able to move the wire out of the beam. The horizontal E11 wire is now disabled and unplugged locally. The problem will need to be addressed in the next Tevatron access. The E17 wire is also confirmed to be broken as of January 12, 2009. 5) Four RFT boards have been delivered from the manufacturer and one of them is being currently assembled. The board is expected to be complete and ready for testing within 1.5 weeks. Our next meeting is scheduled for Wednesday, February 4, 2009.