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Parameter study and IR design for CEPC local double ring sc Parameter study and IR design for CEPC local double ring sc

Parameter study and IR design for CEPC local double ring sc - PowerPoint Presentation

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Parameter study and IR design for CEPC local double ring sc - PPT Presentation

Dou Wang Jie Gao Feng Su Yuan Zhang Ming Xiao Yiwei Wang Bai Sha Tianjian Bian Zhe Duan CEPC AP meeting 20151127 Machine constraints given parameters Energy ID: 440198

waist crab power ring crab waist ring power acceptance luminosity sextupoles double ffs scheme beam cepc design sextupole radius

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Slide1

Parameter study and IR design for CEPC local double ring scheme

Dou Wang, Jie Gao, Feng Su, Yuan Zhang, Ming Xiao, Yiwei Wang, Bai Sha, Tianjian Bian, Zhe Duan

CEPC AP meeting,

20151127Slide2

Machine constraints / given parameters

Energy E0Circumference C0NIP

Beam power

P

0y*R=y/xEmittance coupling factor Bending radius Piwinski angle luminosity enhancement by crab waist Fl ~1.5Energy acceptance (DA)Phase advance per cell (FODO)A=0/BS (A>~3)Slide3

 

Pre-CDR

crab waist

-high

lumi.crab waist-low power

Number of IPs

222Energy (GeV)120120120Circumference (km)545454SR loss/turn (GeV)3.12.962.96Half crossing angle (mrad)014.511.5Piwinski angle022Ne/bunch (1011)3.793.792.81Bunch number505040Beam current (mA)16.616.910.1SR power /beam (MW)51.75030Bending radius (km)6.16.26.2Momentum compaction (10-5)3.43.02.6IP x/y (m)0.8/0.00120.306/0.00120.22/0.001Emittance x/y (nm)6.12/0.0183.34/0.012.67/0.008Transverse IP (um)69.97/0.1532/0.1124.3/0.09x/IP0.1180.040.04y/IP0.0830.110.11VRF (GV)6.873.73.6f RF (MHz)650650650Nature z (mm)2.143.32.6Total z (mm)2.654.44.2Energy spread (%)0.130.130.13Energy acceptance (%)222Energy acceptance by RF (%)62.22.2n0.230.490.47Life time due to beamstrahlung_cal (minute)475341F (hour glass)0.680.730.69Lmax/IP (1034cm-2s-1)2.042.972.03

Primary parameter designSlide4

Combine with local double ring lattice

Choice 1

Choice 2Slide5

Double ring FFS design with crab sextupoles

Ec=100 keVBetax=0.8mBetay=0.003m

IP

Crab

sextupole

L*=1.5m

L(DQ0)=0.91m, G(DQ0)=-300T/mL(DF1)=0.74m, G(DF1)=106T/mL0=4mAs Oide said, the second FFS sextupoles of the CCS-Y section can work as the crab sextupoles, if their strengths and phases to the IP are properly chosen.Slide6

Crab

sextupole strengthThe crab

sextupole

should be placed on both sides of the IP in phase with the IP in the horizontal plane and at π/2 in the vertical one.

x=2, y=2.5Slide7

Chromaticity correctionSlide8

summary

CEPC partial double ring parameters for high luminosity mode has been adjusted to enlarge the energy acceptance of RF system.Based on crab waist scheme, we can get higher luminosity (2.97*1034

cm

-2

s-1) keeping head-on beam power or to reduce the beam power (30 MW) keeping same luminosity. New FFS with crab sextupoles has been designed. DA optimization of the whole ring is undergoing.For next step, arc lattice should be redesigned as soon as possible to get smaller emittance for crab waist scheme.