LET: Meetings: Minutes for 2005 October 25
Attending: Representatives from LEPP, FNAL, LBL, and SLAC
Spin Rotator Design: Jeff Smith presented his progress on design for a solenoid-based spin rotator for the ILC Ring to Main Linac (RTML) region. One issue of interest is that the integrated solenoid fields need to be fairly large to match the 5 GeV beam energy, and therefore they either have to be very strong or very long. Jeff is using 3.1 T peak fields, but Fermilab has 5 T and 6 T solenoids, with appropriately small apertures. Emittance growth in the system from chromatic effects is an issue -- the current design has about 4% (0.8 nm) in the vertical plane; to get such small growth requires considerable tweaking of the optics, and the solution only works right if both of the solenoid pairs are on. It is expected that the optical tolerances of the components will be tight.
Reports from the Laboratories:
- LEPP: Studies are continuing in trying to get different DFS implementations to give similar results. Most recently Jeff has made some corrections and improvements in his implementation which get closer to Daniel Schulte's results.
- FNAL: Paul is wrapping up his 1:1 steering study in Lucretia and trying out the same study in several other codes to get a more global understanding for the ease of use of various simulation tools for these sorts of tuning studies.
- LBL: It is expected that once the damping ring studies conclude, there will be time in the coming year to get back into the bunch compressor.
- SLAC: LET group has a new post-doc, Sergei Seletskiy. There is a first draft of the RTML BCD posted on the web.
Next Meeting: Tuesday, 08-Oct-2005, 12:30 / 11:30 / 9:30.