Minute of the MUCOOL meeting, Oct. 16 1998, Fermilab. Present: Alvin Tollestrup, Jim Norrem, Norbert Holtkamp, Dave Neueffer, Alan Bross, Panagiotis Spentzouris, Ed. Black, Steve Geer(co-chair), Paul Lebrun (scribe), Ray Stefanski(chair), Al Moretti, Tom Kobilarscik, Yokoi, Raja, M. Popovic, Al Russel. Phone conference participant: Kevin Lee (UCLA), Steve Kahn (BNL), Dan Kaplan (IIT). (I probably forgot a few names. Please forgive me, and send an e-mail to Ray if corrections are needed.) Agenda: 1. Integration & engineering - Ed. Black 2. Brief status on UCLA simulation - Kevin Lee 3. Summary of the Berkeley workshop, discussion - Steve Geer. Prior to the schedule agenda, two topics were briefly discussed: a. What is the schedule for R&D on the 15 cm Li lens for increasing p-bar production during RunII ? What are facts? There was a consensus that we could probably take advantage of this R&D program, so we need to get correct information, which does not seem easy. b. CERN has a power supply we could use for either the horm focusing system or for mini-BooNE or our Li lens R&D. (see discussion in the minutes, dated Sept. 25 1998) However, we need to find a home for this hardware, at Fermilab. The requirement is 30 x 20', at a minimum, once it's in use, connect to a real device, the whole system could take 30 x 40'. Does Lab G has room for it?. In order to use it, we need 1/2 MW power, LCW. Al Moretti and Ray Stefanski will investigate. 1. Integration & engineering issues on the Alternate Solenoid cooling channel. - Ed. Black - Ed presented a few engineering drawings on a preliminary design detail of the Alternate Cooling channel. The discussion focused on the two so far unresolved issues: a. The outer diameter of the cavity is currently 42 cm. We need an extra 2 cm for clearance, strengthening and, possibly cooling pipes, wiring.. This means that the inner diameter of the "bucking" coils to shape the field so that we get the correct beta function has to be 44 cm. In the current simulation, the coils have definitly a smaller radius. Based on the information I (P.L.) received from Bob, currently, in DPGeant, the coils at Z = 42 cm. (where the cavity starts, more or less) has a diameter of 36 cm. Note that the coils are assumed to be perfectly thin. The effective diameters range from 32 cm up to 44 cm., while the "average" diameter on John Miller's drawing looks like ~72 cm. => We've got a real problem. Al moretti is very reluctant to give up a few cm, the cavity is already marginal as it is, no point increasing the shunt impedance by compromising on the coupling system. The action plan is to interact with John Miller, who might have a field map at this point, and run simulation. Conversely, explain the problem to him so he can make necessary design changes. Bob Palmer should be involved at this point, as the problem might get to be real difficult to solve. Note : The coil radii in the DPGeant simulation have been added in these notes, I did not have the numbers at the meeting. b. Accessibility for maintenance: As designed, the channel is currently assembled from either upstream or downstream end, where pieces (rigid coils over the low beta, high beta regions and the 1.3 m. long rigid cavity assembly) are "telescoped" together. It's not a very realistic way to assemble a beam, things need to come apart transverserly. => we'll need to break the channel somehwere. Ed also showed a preliminary engineering drawing of the liquid Hydrogen absobers. They currently have 2 mil Stainless Steel "pressure" windows followed by a 3 mil titanium window for heat shield. These numbers need to be inserted in DPGeant, and a new cooling factor needs to be computed. Based on preliminary investigation, these thicknesses should not compromise the performance too much. ( P.S., Ed, if you see this, could you send me a copy of the drawing of the SLAC target.. I want to check radius as well... ) 2. Brief report on simulation effort at UCLA, by Kevin Lee. Kevin is currently getting familiar with the GNU makefile environment. We do not want to maintain our code with PATCHY, in any event, the current version of Geant is no longer supported by PATCHY. Kevin sucessfully installed Geant on his SUN, he is getting more familiar with the Geant environment. He also has DPGeant code. He plans to contact Steve Kahn, to see where he could contribute, to discuss which specific instrument he should simulate. 3. Summary of the Berkely workshop, "experiment group", chaired by Steve Geer. Steve went over the transparency he showed last Tuesday at LBL. These transparencies should soon be available on the WWW. Anyway, the discussion that followed was focused on the "scaleback plan", where we would not necessarily be able to demonstrate 6D cooling, but we would either demonstrate limited 4D cooling, or get accurate measurements on multiple scattering in presence of strong magnetic field. More discussions and studies (e.g. simulations) will be needed to assess the merits of such plans.