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*Subject*: [atf2-magnet 20] Re: Multipole effect of Q on beam size*From*: Shigeru KURODA <shigeru.kuroda@xxxxxx>*Date*: Fri, 20 May 2005 19:10:59 +0900

Dear All, I have found errors in my calculation. In estimating BN/B1, factorial N! was missing. So for the case of sextupole field (N=2), the tolerance was larger by factor 2. I also changed the radius r to be 10mm instead of 16mm, and E=1.3 GeV. Please find the new results in the attached file( Excel ). SX component should be less than 0.04% for 20cm Q and 3e-5 for FD which would be a problem. For higher order component( N=5 and 9 ), the tolerance becomes tighter but still realistic, I think. N=5 <10% for 20cm Q <0.2% for FD N=9 <100% for 20cm Q <4% for FD Please check and comment. Best Regards, S.Kuroda

**Attachment:
ATF2 FF Q 05/5/19**

**References**:**[atf2-magnet 16] Multipole effect of Q on beam size***From:*Shigeru KURODA

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