MUCOOL Meeting Minutes for Friday July 24, 1998 Original Agenda 1. Panagiotis Spentzouris on simulations 2. Rick Fernow w/r BNL meeting agenda (if available) 3. Kirk McDonald on TPC work 4. John Corlett, Mike Green on solenoids 5. Steve Kahn and Tom Kobilarcik on the muon beam A conference call was established with Mike Green, Kirk McDonald, Rick Fernow and Steve Kahn. Attendees at Fermilab included Zubao Qian, Ed Black, Al Moretti, Alvin Tollestrup, Valeri Balbekov, Yuriy Pischalnikov, Al Russell, Tom Kobilarcik, Fred Mills, Ray Stefanski (Chair), Jim Norem, Dave Carey, Raja Rajendran, Steve Geer, Dave Finley and Panagiotis Spentzouris. Panagiotis passed the minute taking baton to Dave. 1. New Beam. Panagiotis described a simulation of a new beam by Paul LeBrun and Tom Kobilarcik. The new beam (also called the July 13 beam) includes a wedge of lithium after the 90 degree bend just before the triplet at the entry to the cooling channel. Without the wedge the transmission is unacceptably small, less than about 10%. With the wedge the transmission is about 30%. The first iteration includes a solenoid to match to the cooling channel. Cooling is evident, but so is some heating of unknown origin. Paul and others say that instrumentation is needed in the channel, perhaps scintillating fibers or roving counters (i. e. removable). 2. Agenda for MUCOOL collaboration meeting at BNL. Monday (August 31) is being organized by Rick Fernow and will be devoted to theoretical issues with an emphasis on cooling and perhaps include presentation of work by Palmer, Bhat, Balbekov, Norem and others. Tuesday (September 1) and Wednesday (September 2) morning are being organized by Steve Geer and will be devoted to experimental issues with presentations by people listed on a transparency which Steve showed and will put on the web. 3. TPC. Kirk McDonald described work on a 1 inch diameter, 4 inch long prototype TPC. It will be put in a 6 Tesla warm bore magnet at Princeton. The prime issue with merging the TPC and a magnet is either achieving a field uniformity of a few parts in 10,000 or knowing the field characteristics sufficiently well so that the field can be calculated to this same level. Kirk reported that a 10 psec jitter has been reputed for a Hamamatsu micro channel place photomultiplier. He suggested that a laser at Princeton could be used to look into this, but perhaps a beam test at KEK should also be considered. 4. Solenoid. Mike Green laid out his plans for the remainder of this fiscal year. He intends to complete the design of the solenoid and review it by the week of August 24. He intends to send the superconductor order to LBNL by about September 20. Then in October the procurement will begin for the dewar for the horizontal cryostat. The tested magnet for the rf experiment should be shipped to Fermilab sometime between April and June 1999. It will be shipped cold and the helium should take about a week or so to boil off. A discussion followed which indicated that it is time to get the Fermilab cryogenic safety organization in the loop now to make sure the design meets Fermilab policy. Ray Stefanski will get the appropriate cryo name to Al Moretti. 5. Bent Solenoid Calculations. Steve Kahn described calculations using TOSCA for a 30 kgauss solenoid. It shows a 1 kgauss spike in the transverse field as one enters and leaves the bent solenoid, and it extends over a few centimeters. If real, he does not think it should be too big a deal to compensate it with, for example, a dipole magnet. Next Meeting: Contact Ray Stefanski (stefanski@fnal.gov) to give him agenda items and to arrange transparencies for the disembodied presentations.