minutes collaboration 15.Nov.2004 at Princeton university

present: H.Kirk, K.McDonal, P.Spampinato, V.Graves, P.Titus, B.Sanders, A.Fabich

13:30 visit to the workshop, discussion with B.Sanders

tour around Princeton and past workplace and house of Einstein

15:30 discussion on nozzle

• BG presents 3D-view of mercury jet in solenoid and slides
• AF presents excel spreadsheet of JL
• PS asks for the basic requirements needed for the setup.
• where should the nozzle be placed. The clearance of the nozzle of the beam line needs to be 3 sigma beam size which equals about 5mm. A thickness of the pipe is 2 mm and a radius of the jet, the jet center must be a minimum 12 mm of the proton beam center.
  • Several people heard, that a large reservoir and a short nozzle are preferable for the mercury jet.
  • a possible solution would be a reservoir of the diameter of the bore with a hole in the path of the proton beam.
  • Place the return loop as far as possible outside the high field region extending outside the bore, would minimize the impact of B-field on jet loop.
  • Vertical central position of all three axis meets in the longitudinal center of the solenoid, where also the angles of 33mrad and 67 mrad are given. Every effect of MHD and gravitation have to be compensated such, that these specifications are met.
• Somebody needs to make a simulation on the forces, which are going to act on the contained mercury flow in the pipes.
• At zero B-field, the requirements of the velocity and tilt of the jet might slightly change. Shall we foresee an external tilt of the whole setup including solenoid and jet loop?
• jet catcher: is located below proton beam.
  • what thickness is allowed to be hit by the proton beam? 0.5 mm is most probable allowable. The issue is the heat deposition in the the plate.
• VG presents new overall layout in the tunnel. The total mercury loop including the motor is enormous (approx. 4m!).