- The BI line needs to be designed for H- injection from the start, a 2
phases implementation is not foreseen.
- It is proposed that the linac4 pulse, currently with head and tail dump
separation, will be changed to 4 individual pulses. Typical pulses of 0.1 ms
with a 0.001 ms gap would give possibilities for a 3 or 4 module distributor
design. Internal head and tail dumps will no longer needed, but the need for an
internal dump to absorb the beam in case of a mal-function of the distributor
needs to be studied.
- It needs to be investigated if the distributor pulse length and gap can be fixed with adjustable pulses from linac4 depending on the injection timing. (NDLR: Frank Gerigk communicated that following the discussion on the injection timing he discussed the issue with Maurizio and concluded that one needs to keep the ability for flexible injection timing. Meaning that one needs to be able to adjust the number of injection turns from pulse to pulse. According to the base-line design (0.4 ms pulse from linac4) the maximum number of injected turns per ring should be 65 - 100. However it would be good to have a margin on that. In case we only get lower current from the source we need to lengthen the pulse, and it is preferred that the hardware is able to deal with up to 150 - 200 injected turns per ring (unless it will be proven that this would complicate things too much). For the minimum number of injected turns, one has to consider to possibility to produce very short pilot beams for setting up downstream machines. At the moment 1-3 injection turns per ring seem to be possible and this capability should be maintained for Linac4 injection.
- NDLR: Tony Folwer communicated that a 200 turn injection to the PSB implies
that the BI.DIS will need a maximum 800µs pulse length coverage.
- The aperture of the transfer line is 70 mm, it needs to be checked if this
sufficient for the PSB BI line. This would be beneficial for a new SMV design,
at the moment the SMV has a 112 mm aperture, which limits the increase of
performance due to the septum thickness.
- BT would like to receive the the optics files, at least the twiss output, to be able to decide on the aperture.
WW