- Brennan mentioned that M.Vretenaar has approved 900ms repetition rate for PSB operation instead of the the baseline design of 2 Hz booster operation.
- Brennan presented the aperture implications of moving KSW1L1 to period 16 (see slides). The vertical and horizontal beam aperture constraint of the PSB are given by the beamscope windows. The horizontal as well vertical aperture of the KSW1L1 after moving to period 16 are acceptable. Nevertheless, the studies have revealed that the baseline BS apertures are smaller then the PSB dipole apertures, thus not acceptable. It was propossed that, if technically possible, the BS apertures should be >62mm.
- Jan presented the results of simulations and prototype testing of BS1 (see slides). Before starting the presentation he mentioned that the difference between the simulation and test results are probably due to the mesh limitations and more detailed simulations will be done. For the tests a pulse with a half sine of 1 ms and 3.5 ms base width was used. The main conclusions of the test are that the lamination thickness will be critical (thin laminations will be required which will deteriorate the vacuum requirements) and a stray field of below 1% can be expected.
- Tony presented two options for the BS magnet power supply,
Opening/Closing switch with Freewheel resistor and PFN option with closing
switch (see slides). All
calculation were done with the baseline 46mm horizontal aperture, and in both
cases a 8-10 turn magnet is required. It also became clear that the limiting
factor is the required falltime of the system. The influence of >62mm required
aperture needs to be investigated.
- The list of outstanding issues was
discussed and accordingly modified.
Proposed items for next meeting are:
- Required fall time for BS magnets.