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Dear Glen, I communicated with Brett Parker the following issues. The requirement for the correction coils for SD0 or QD0 are as follows. When we don't have a SD0 mover, we can consider two methods of IP tuning instead of sextupole mover. 1) [by using the qudrupole and skew quadrupole correction magnet around SD0] The requirement of the strength of the correction magnet are the maximum strength of the correction magnet is GL=+/-2.6T, and the precision is at least 5e-5 in order to compensate the SD0 position movement by +/-1mm for ECM=250-500GeV operation. 2) [by using the combination of the cryo-mover and dipole correction coil around QD0] The requirement of the strength of the correction magnet are the maximum strength of the correction magnet is BL=0.15Tm, and the precision is also 5e-5. The requirement of SF1 is a little bit different, but I expect to be same order to SD0. I think the required precision is very hard to other magnets ( > 5e-4 ) for both cases (but not impossible??). We should decide whether will we put the SD0, SF1 mover or compensate by using correction coil. Sincerely, Toshiyuki OKUGI, KEK ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the ILC-BDS list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=ILC-BDS&A=1