Notes from Main Injector/Recycler Group Meeting Wednesday 04 December 2002 Bruce C. Brown John Marriner - Studies Planning Martin Hu has a draft plan for aperture scan studies with protons. We will try to get this done this weekend. We will do the scans with the Main Injector ramping but will ask for the ramp to be turned off for admittance measurements. Intermittently through the scanning effort we will stop and use the scrapers to study the available admittance. The proton beam will be set to fill the aperture by mis-steering the injection (kicker horizontal or corrector vertical). On or about December 16 we will shift to a mode emphasizing pbar studies. Following each Tevatron shot, the PBar source will stack about 30 mA of pbars and shoot them to the Recycler from the stacking lattice. This will be a routine which we will maintain while gaining experience such that short setup times and high efficiencies for this mode are achieved. The design for this transfer now calls for transfers to add 10 eV-sec to the pbars in the recycler in 4 bunches of 2.5 Hz pbars. We will need to optimize these choices. Elvin Harms will coordinate this activity overall. Dan Broemmelsiek is Recycler coordinator. There will be a meeting with Elvin next week to develop further plans for this activity. Some questions to discuss include, "Will we do a pilot shot prior to the 30 mA transfer?" We will start by circulating the beam from the Accumulator in the Main Injector prior to transfer to the Recycler, later developing the mode in which the MI is a "transfer line". Re-injecting into the MI and accelerating will also follow in this time period. Issues about 2.5 MHz vs 53 MHz acceleration will need discussion. In the period before December 16, we should have the opportunity for many additional proton studies of the Recycler. A high priority is studies of the orbit and tune correction for MI Ramp effects Stan Pruss will create the studies plan. The longitudinal emittance growth is the most important effect to compensate. Alberto Marchionni will prepare a study plan for transfer line studies. Other proton studies may include store-extract-accelerate exercises and BPM studies (needs improved coalescing). Announcements/Discussion The noise source will be connected to the 'out-of-plane' BPM's at 602 and 603. These detector plates will not be provided with clearing electrode voltages. The BLT for MI reverse injection needs to be fixed. A bug was found in the TLG software. Changes were supposed to be written to a database after they are sent. This has been broken since at least June and resulted recently in serious operational problems. A fix is being implemented. Guess this shows we need to remain alert. The SDA has been populated for pbar transfers to RR. We need to see if the data is there, is sensible. This can be checked on transfers we have the Operations crew do for us. A discussion is underway about electronics changes for the BPM amplifiers, even on channels which will not get the new electronics. This is a return to consideration of eliminating the resonator since it creates coupling between the two plates which makes the detected signal time dependent and the timing of the sampling critical. Issues of sensitivity and effort required will need consideration.