!"#$%&'()"*"+','*-!
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!!

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e+ 3.6 A!

Damping Ring!

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Factory Machine

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&I $ ) R"±L=
S # (( ± *y ± ++ # L
2ere ' % y ± * R$y ±If #x* = #x+* = #x-* and #y* = #y+* = #y-*,S = 1+#y*/#x*(aspect ratio of the beam size at IP).!

Three fundamental parameters to determine the luminosity.!

where!

!

"y± =re # y*± N !
2$% ±&*y!

(& + & )
*
x!

*
y!

R"y ±

Target Luminosity is 8x1035 cm-2s-1 in SuperKEKB.!

!

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W-S!

W-S!

L = 8x1035!

LER!

LER!
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S;T(('&<#O&<[*#'(#OXTV-*X"#)%'(#'(#c!"!#$%&"'()*+&'&d"###•! CT3*2*;W##X=&OG'S#OV*;-R;*#>`PA#3'[[#5*#;*XRS*X#5*SOR(*#TZ#-%*#&T&['&*O;#Z;'&<*W#O&X#\'&*GOaS#-*;G(#'&#-%*#'&-*;OSaT&#;*<'T&#>N1AW#O&X#O[(T#(-;T&<#(*I-RVT[*("!
SuperKEKB!
Natural chromaticity LER: $x/$y = -104/-789
HER: $x/$y = -187/-853!

KEKB!
LER: $x/$y = -72/-123
HER: $x/$y = -70/-124!

!"#$%&'(%'#6#./.!

!!!

3044%-%0&(=#$'+'High Current Scheme

Nano-Beam Scheme

#z!

" *x

#x*!
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overlap region = bunch length

overlap region (! bunch length)

" *x
d=
#

!
Hourglass requirement

Hourglass requirement*y" # $ z ~5 mm!
!
!"#$%&'(%'#6#./.!

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$ *x
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~200-300 µm!
%
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y

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" y*+ LER waist!
e-!

e+!

2% !

d1 =

d1!
d2!

2#x-!

2" x +
sin2#
There are two kinds ofhourglass requirements.!

2#x+!

2"
d2 = ! x +tan2#' 2% x +2% x# *,( sin2& tan2& +*Hourglass (HG) requirement:! " y#$ max)

,

' 2%
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Luminosity gain is 1($y) x 20(1/!y*) x 2(I) = 40 times of KEKB.
Then, we get 8x1035 cm-2s-1!"#$%&'(%'#6#./.!

!'!

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Crossing angle = LER angle + HER angle = 83 mrad!
proportional to )4!

Solenoid axis
= angle bisector!
Energy ratio
4/(4+7)!

We choose 41.5 mrad and the contribution of solenoid fringe is ~4 pm. !
!"#$%&'(%'#6#./.!

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"%!

T*"#U%&;(=%+/4"V0&(02(8/&#$(=,"D%4%,1!
The 14th KEKB Review (Oide’s talk)!
LER
E = 3.5 GeV
Ib = 1.87 mA
LER!

[ E = 4 GeV
Ib = 1.44 mA
in the latest
parameter ]!
No significant
bunch lengthening
is found in HER. !

!"#$%&'(%'#6#./.!

"&!

Machine Parameters of SuperKEKB

2010/Feb/08!

B/1!

C/1!

"I!

D"9>9"8A!

9"J>9"DA!

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#K!

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Peak Luminosity(cm-2s-1)!

Integrated Luminosity(ab-1)!

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Milestone of SuperKEKB!
9 month/year
20 days/month!

We will reach 50 ab-1
in 2020~2021.!

Commissioning starts
mid of 2014!

Shutdown
for upgrade!
Year!
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!

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