- Locating the chicane magnets outside of the (conductive) beam pipe is unique, and possible effects on the field quality should be carefully evaluated. Also the quality requirements for the chicane magnets, both uniformity and higher harmonics, including the effects of eddy currents in the beam pipes should be studied. Specifications should be made as to the field quality required by the chicane magnets, in terms of allowed closed orbit distortion and tune shift, and this should inform the design of the magnets and power supplies. It is recommended to pPower the chicane magnets in series if possible, since most existing systems use single power supplies to insure field matching.
- The proposed longitudinal painting scheme is extremely complex, considering the rather marginal benefit.
- The loss on the head and tail dumps within the septum is significant, and the resulting activation will likely make the system unserviceable. Considering the beam load on the head and tail dumps, methods of minimizing the head and tail should be investigated.
- The load on the stripping foil is lower than elsewhere, and the foil is more likely to be damaged mechanically, than by beam. An electron collector will not needed.
- Instrumentation at the injection region is extremely important.
- Besides linear painting, other wave forms should be considered.
It was decided that a price estimate of both solutions should be made in order to forward these proposals to the L4 management.
- Use a combination of Kicker and Septum magnets instead if the 'switching magnet' LTB.BHZ40 to defect the head (and tail) into the dump of the measurement lines. This system could also be used to deflect the full beam to the measurement lines.
- Add a SMV on top of SMV1 to deflect the head of the pulse to a dump located outside the BISMV tank and BI line
. This would also require an increase of the beam offset at BI.DIS from 5.2 mm to 5.5 mm, the BI.DIS4 deflection from 3.62 mrad to 4.3 mrad and the BI.DVT40 deflection from 7.27 to 8 mrad.