9.24.2012

1) Magnetic Field Map - 3-D

Stepan will contact his JLAB visitor that produced the 3-D map at y=0. His colleague comes to JLAB on occasion. In the mean time the map at y=0 will be adequate, especially near the target where the particles are close to y=0. Downstream the tracks are further off axis, but pointing to the ECAL should be accurate enough.

2) Procedures with electron beam.

There was a long discussion about choices for the magnetic field, beam energy and separation of the chicane to allow the muon detector to be inserted. These choices are complicated and need a detailed proposal since a lot of things that have to work. For example: 1) Presently the Frascati magnets can only run up to 0.6 tesla meters so we couldn't run the analysing magnet above 1.2 Tesla meters and still close the orbit without reducing the gap from 3" to say 2". 2) Moving the 1st chicane magnet upstream will place the straight ahead (no field) beam and the beam with field at a different separation. This also occurs if the chicane is run at higher field (say 1.0 or 1.5 tesla meter as desired for better momentum resolution). In addition, these changes will also change the paths of the beams going through the ECAL vacuum chamber, which was designed for 0.5 Tesla meter running and current separation of the magnets of the chicane. Complicated! :(

3) Instrumentation.

Intensity monitors, Beam position monitors, Quadrant detector in photon beam at dump, Radiation monitors to protect silicon. Synchrotron Radiation monitor suggected by F-X.

4) Beam Polarization is desired if available since future ideas on physics could be exploited.

5) Project list.

Ken will produce a first draft in excel format and send it out for corrections and additions. From this a project management document can be prepared.