high intensity proton beam line

Beam Line: Target station M to Target station ETarget station E

high intensity proton beam line This second section of the 590 MeV Proton Channel is 18 m long and transports the beam with the help of 2 quadrupole triplets from the target station M (Mince=thin) to the target station E (Epais=thick). 6 horizontal, 6 vertical profile monitors, 2 horizontal and 2 vertical steering magnets are additional devices belonging to this section. The first triplet is set to such field values that the beam forms an intermediate double waist half way between target station M and target station E ( Fig.1: 16 kB ) .
high intensity proton beam line Three profile monitor pairs are placed around this waist location in order to allow a pretty accurate determination of the projected emittances (around 8pimmmrad in both directions) and the position of the waists. Thus, also a rather precise extrapolation of the sizes and positions of the 2 target waists is possible. The horizontal 4sigma width of the beam at the location of Target station E is around 3 mm, whereas in vertical direction the 4sigma width is around 5 mm.
high intensity proton beam line Just in front of Target station E there is the high acceptance extraction magnet (AHSW41) for the piE5 secondary beam line. The fringe field of this magnet deviates the proton beam up to ±6 degrees. Therefor 2 additional compensation magnets (AHU and AHV) are required to keep the beam on the axis after Target station E ( see Fig.2, 57 kB). The 3 bending magnets are controlled with 3 'super-knobs' to facilitate easy tuning and to avoid dangerous wrong settings.
high intensity proton beam line Fig.3 (19 kB) shows a top view picture of the old section between the 2 quadrupole triplets. This design stems from the time with only 0.1 mA of proton beam intensity.The 3 pairs of profile monitors (MHP25-MHP30) with 2 turbo molecular pumps between them can be seen as well as the 2 steering magnets (SHB13y + SHB14x) on the bottom of the picture.
high intensity proton beam line Fig. 4 (55 kB) shows a top view picture of the new design commissioned in May 2001. Sketches of how it would have to look like are already existing since 1996. Fig. 5 (53 kB) shows a side view and Fig. 6 (39 kB) a top view of the new layout. The design of some components (mainly steering magnets, profile and beam center monitors, vacuum components) has been developed for the splitter region modification and could be re-used here for this beam line section. See also PSI Scientific and Technical Report 2001 Volume VI (Large Research Facilities) on pages 31, 32.

Urs Rohrerhigh intensity proton beam line Last updated by Urs Rohrer on 27-Mar-2006