1. 1 Transport calculations for beam line 4N Marco Schippers, Aug 24, 2007 Transport plots have been made with Urs Rohrer ‘s transport (PSI) Mind that above the horizontal axis is Y/Vertical and below is X/Horizontal as well as the positive direction of the dispersion (dashed line). Scaling: Xmax and Ymax=25 mm radius, ticks along the vertical axis are at 5 mm. The component aperture-radii are plotted at 40% of their real value. The length of the plots showing the first part of the beam line are 25 m, ticks on hor. axis at every meter. The arrows indicate locations of fits and wall faces. The initial proposal that Glen Stinson described as beam line 4PR in TRI-DNA-01-2 has been used as Ansatz to include the following new situations and suggestions: The new Transport matrices at the exit of the combination magnet have been used The target-ideas of Pierre Bricault have been included. There is no problem for the electron accelerator to use the NE corner of the proton hall (Rob Raxdale) The tunnel to the North can also be used to accommodate an electron beam line (Rob Laxdale) There is space for 2 collimators that can scrape off halo. (Rick Baartman) A beam dump at the eastern end, at zero-degr is foreseen. It allows beam studies of an analyzed beam. (Rick Baartmann) The 30 degr bending magnet to the first target station could be split up in a fast kicker magnet of e.g.5 degr, followed by 25 degr bending. These magnets must be placed a bit away from each other, but that can be done. The beam optics has been made more symmetric, to allow easier tuning (Rick Baartman)

2. 2 Stinson original design 4PR (2001) Y --- disp X Stinson original design 4PR, but with correct R- matrix (Yi-nong Aug 23, 2007). Beam line setting not changed.

3. 3 1.New, correct R matrix (Yi-nong Aug 23, 2007). 2.A 4th quad has been put in the valve, replacing the obsolete solenoid. Q3 has been shifted a bit. The 4 quads make (fit1) a double waist in 4VB1,+keep achromatic behind 4VB1. Now dispersion is decoupled from optics. 3.At fit2, just at the entrance of the proton hall, a minimum beam size is obtained in x and y. This is an ideal location for a collimator in x and y, that should intercept halo. (C1xy in plot) 4.Fit3 is in the middle of the achromat. Here the dispersion is 32 mm/%dp/p. This is the ideal location of a second slit, only in x, that again intercepts halo, especially the halo with a lower energy than the beam energy. (C2x in plot) 5.The achromats and the beam transport sections have been designed symmetric to minimize higher order effects. 6.The blocks have as much as possible similar magnets, and inter-magnet distances 7.Behind the achromat there is standard transport to a second achromat (not yet designed), after which the achromatic branches to the new target stations are planned. Still TO DO 1.Place for wobbling magnet 2.Straight to North: electron tgt, 2 p tgts (branching off, to east 1 p beam dump of analyzed beams 3.Sensitivity due to input beam parameters 4.Option: make B3,B4 achr with only 1 Quad in the middle (cheaper) 5.Design office : project layout in TRIUMF floorplan 25 mm Y --- disp X 25mm Input file: 4pr-MS-070823.dat C1xy C2x

4. 4 Length of plot=85 m, ticks on hor. axis each 5 m 4pr-MS-070824.dat Electron line P-dump ptgt1 ptgt2 edump etgt 25 mm Y --- disp X 25mm