List of Issues for Beam runing in ATF EXT and ATF2

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List of Issues for Beam runing in ATF EXT and ATF2 - PowerPoint PPT Presentation

1.Optics and layout 1.1 Finalization geometry Confirmation of common Q strength with DR and finalization of layout and optics ( Alignment group requires final version ) 1.2 Optimization of SX strength and skew position in EXT  EXT tuning 2. EXT tuning

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1.Optics and layout

1.1 Finalization geometry

Confirmation of common Q strength with DR and finalization

of layout and optics ( Alignment group requires final version )

1.2 Optimization of SX strength and skew position in EXT

 EXT tuning

2. EXT tuning

2.1 Dispersion correction

2.2 Coupling correction  need new skew?

3. FF tuning

3.1 BBA

3.2 Beam size tuning

List of Issues for Beam runing in ATF EXT and ATF2

ReL3

N=2

ImL3

Pole Face Modification of Q

Scaling

C6real=C6C2real r02 r0-6, B6(5)=6!C6real, B6= B6(5) r 5/5!

B6/B2= B6(5) r 5/5!/(2C2real r)= 3 C6real r 4/C2real

= 3 C6C2realr0-4 r 4/C2real = 3 C6 (r/r0)4

<12 a (r/r0)4 =12 (areal/ r02 ) (r/r0)4 =12 areal r 4 / r06

(a is also scaled )

If r=10mm, bore radius r0 =25mm and we need B6/B2<1e-4,

then areal <2e-7m2 .

When the area is square, the dip height and width must be

less than 4.5e-4 m. ??

Where a=h Dz

2 S/(a N)

N=2

N f

2 S/(a N) has its max of 1 at N f=0,

and monotonically decreasing with larger N f.