2002 EPICS SeminarInstitute of High Energy PhysicsChinese Academy of Sciences20-22 August, 2002

Introduction to BEPCIIEPICS Seminar 2002August 20, 2002, IHEP From BEPC to BEPCII Basic Design Key Technologies Budget and schedule Summary

(1) From BEPC to BEPCII Status of the BEPC Why BEPCII What is BEPCII

1.1 The Status of the BEPC

The Layout of BEPC storage ring

Main ParametersBeam Energy (E) 1.0 ~ 2.5 GeV Revolution frequency (fr) 1.247 MHzLattice Type FODO + Low-b Insertions *x -function at IP (*x/ *y) 1.3/0.05 mTransverse Tune (x/y) 5.8/6.8 (Col. Mode) 8.72/4.75 (SR Mode)Natural Energy Spread (e) 2.64E 10-4Momentum Com. Factor (p) 0.042 (Col. Mode) 0.016 (SR Mode)Hor. Natural Emittance (x0) 0.4@1.55 GeV, 0.076@2.2GeV(SR) mmmrRF Frequency (frf) 199.533 MHzHarmonic Number (h) 160RF Voltage (Vrf) 0.6~1.6 MVBunch Number (Nb) 1*1 (Col.), 60~80 (SR)Maximum Beam Current 50mA@1.55 GeV (Col.,) 130mA (SR)Luminosity 5 1030 cm-2 s-1 @1.55 GeV, 11031 cm-2 s-1 @1.89GeV

Statistics of 00-01 Operation 4%Injection12%MD10%BES42%BSRF26%Fault6%Start-up

Daily J/y operation of BEPC Period Days Beam time (hrs.) J/y events Lmax(1030cm-2 s-1) t(hrs) 99-00 142 2323 24 M4 8-10 00-01 110 190022 M5 8-10

Physics results from BEPC/BES

Ecm (GeV)

Physics

BES Data

Other Lab. Data

3.10

J/(

(7.8+50)(106

8.6(106

3.69

((2S)

3.9(106

1.8(106

4.03

(

1.0(105

LEP

4.03

DS, D

22.3 pb-1

CLEO

3.55 m( scan

m(

5 pb-1

2-5 R scan

R value, (QED, (g-2)(

6+85 points

((2, MarkI, Crystal Ball, Pluto

BSRF dedicated operation70 days with three times for about 300 users every yearImax=140 mA, ex0=76 nm, t=20~30 hrs., Ninj=2

Synchrotron radiation application with BSRF

0

500

1000

1500

2000

0.001

0.01

0.1

1

10

100

1000

Single Fluid Inclusion Scanning

Ga

K

Fe

Cr

Ar

Si

110um

100um

90um

80um

70um

60um

50um

40um

30um

20um

10um

0um

Counts

Channel Number

2.1 Why BEPCIIBEPC/BESI collected 9 106 J/y events in about two years;Upgraded BEPC/BESII obtained 5107 J/y events in two years;BEPC/BESI collected 4 106 y events;BEPC /BESII operated for y from Nov. 23, 2001 to March 13, 2002; With 1 106 a week, 1.4107 y was collected in 100 days;Nice physics results are expected;For our physics goal, 6 109 J/y 2109 y per year are expected BEPCII/BESIII!

1.3 Luminosity Strategy of the BEPCIIMicro-b:by* =5cm 1.5 cmSC insertion quadsReduce impedance +SC RF sz =5cm

(2) The Basic Design The double ring structure of BEPCII Design Goals and Main Parameters Lattice and Dynamic Aperture Beam Collective Effects Beam Lifetime & Average Luminosity

2.1 The double ring structure of BEPCII

Mock-up of the double ring installationThere is no showstopper for the transportation, installation, mounting and dismount of the magnets.The existing monuments for survey and alignment will be covered by the inner ring magnets. New monuments will be fixed on the wall of the tunnel.The antechamber of the positron ring needs to be carefully designed to fit the crucial space between two rings;The cable system, the cooling-water system, the pressure-air systemand others need to be rearranged.

Magnet girder and pre-alignment

2.2 Design Goals and Main Parameters

Beam energy range

12 GeV

Optimized beam energy region

1.89GeV

Luminosity @ 1.89 GeV

1(10 33 cm-2s-1

Injection from linac

Full energy injection: Einj=1.551.89GeV

Positron injection rate > 30 mA/min

Dedicated SR operation

250 mA @ 2.5 GeV

Main Parameters

Parameters

Unit

BEPCII

BEPC

Operation energy (E)

GeV

1.02.0

1.02.5

Injection energy (Einj)

GeV

1.551.89

1.3

Circumference (C)

m

237.5

240.4

(*-function at IP ((x*/ (y*)

cm

100/1.5

120/5

Tunes ((x/(y/(s)

6.57/7.61/0.034

5.8/6.7/0.02

Hor. natural emittance ((x0)

mm(mr

0.14 @1.89 GeV

0.39 @1.89 GeV

Damping time (x/y/e)

25/25/12.5 @1.89 GeV

28/28/14@1.89 GeV

RF frequency (frf)

MHz

499.8

199.533

RF voltage per ring (Vrf)

MV

1.5

0.61.6

Bunch number (Nb)

93

2(1

Bunch spacing

m

2.4

240.4

Beam current

Colliding

mA

910 @1.89 GeV

~2(35 @1.89 GeV

SR

250 @ 2.5GeV

130

Bunch length (cm) l

cm

~1.5

~5

Impedance |Z/n|0

(

~0.2

~4

Crossing angle

mrad

(11

0

Vert. beam-beam param. y

0.04

0.04

Beam lifetime

hrs.

2.7

68

luminosity@1.89 GeV

1031cm-2s-1

100

1

2.3 Lattice and Dynamic Aperture

2.4 Single beam collective effectsBunch length and impedanceVrf = 1.5MV, Z/n|eff0.2, Ith = 37mA Ib = 9.8mA, l ~ 1.3 cmBeam-cavity interaction (with KEKB SC cavities)

Resistive wallx/y = 6.6/7.6, Nb = 99, Ib = 9.8mA, = 4.3ms; Ion effects Electron cloud instability: Antechamber with TiN coating for e+ ring Bunch feedbacktL=5 ms, tT =2 ms Single beam instabilities can be damped !

a

(ms)

a

(ms)

Longitudinal

0

6.3

1

122

Transverse

1

26.6

2

1076

2.5 Beam-beam effects Head-on beam-beam effect: similar to BEPC x=0.04 has been demonstrated Parasitic beam-beam effect c=112 mrad Horizontal crossing angle c (5.5-11)2 mrad (BEPCII), 2.32 mrad (CESR) 112 mrad (KEKB), 12.5 2 mrad (DAFNE) Beam-beam simulation for BEPCII with BBC code has shown that the beam-beam parameters and crossing angle of 11 mrad are acceptable.

2.5 Beam Lifetime and Average Luminosity

Taking t =1.35 hrs., tf= 0.4 hr. and L0=11033 cm -2s-1, the optimized collision time is calculated as 1.0 hrs. and the maximum average luminosity is calculated as Lmax~ 0.51033 cm-2s-1. The top-off injection will further improve the average luminosity.

Effect

Condition

Lifetime (hrs.)

Beam-gas interaction

P= 5(10-9 Torr; 80% H2, 20% CO

12.5

Quantum effect

Ax~10 x

>105

Beam-beam bremsstrahlung

x,y=0.04, y*=1.5 cm

6.5

Touschek effects

Ib = 16 mAVrf = 3 MV

7

Overall lifetime

-1=i-1

2.7

(3) Key Technologies Injector Upgrades 500 MHz SC RF System SC Micro-b Quads and IR Magnet System Power Supply System Injection Kickers Vacuum System Instrumentation and Feedback Control Upgrade

BEPCII will apply state of art technologies

3.1 Injector upgrading Basic requirement: Higher intensity: positron injection rate 50 mA/min.; Full energy injection with E=1.55 ~ 1.89 GeV; To enhance the current and energy of the electron beam bombarding the target and to reduce the beam spot; To design and produce a new positron source and to improve its focusing; To increase the repetition rate from present 12.5 Hz to 50 Hz. To consider multi-bunch injection (fRF/fLinac=7/40);

The measures to increase positron intensity

Technical measures

Intensity Factor

To increase the repetition rate fr=12.5Hz ( 50Hz

4

To enhance bombarding energy for e+Ec = 140MeV(240MeV

1.7

To increase primary e beam on target: Ie=2.5A( 6A

2.4

New positron source of higher yield( =1.4%( 2.7% (e+/eGeV)

1.9

Two bunch injectionnb =1 ( 2

1.6

Reduction of pulse lengthT = 2.5ns(1ns

0.4

Total intensity enhancement factor

19.8

BEPCII Positron Source

3.2 500 MHz SC RF System

Basic requirement Sufficient RF voltage for short bunches. Sufficient high RF power. Suppressing the instabilities related to RF system. Stable and reliable RF system

RF frequency

frf

7/40(2856=499.8 MHz

RF voltage

Vrf

1.5 MV

Number of Cavities

Nrfc

2(1

Energy Loss per Turn @ 1.89 GeV

Urf

123 keV/ring

Total Beam SR Power @ 1.89 GeV

Pb

131 kW/ring

Total Power of RF transmitters

Prf

2( 180 kW

RF Cavity in BEPCII Tunnel

3.3 SC Micro-b Quads and IR

3.4 Magnets SystemNew arc magnets

Magnet Type

Dipole

Quadrupole

Sextupole

Magnet Number

42

52

36

Effective Length Leff. (m)

1.42

0.4

0.2

Magnetic Field

7251 Gs

1118 Gs/cm

150 Gs/cm2

Aperture (mm)

120(70

55

70

Current (A)

846

151

141

Current Density (A/mm2)

3.8

5.1

4.8

Two-in-one Quadrupole IQ1

Septum Bending magnet ISPBMagnetic length 0.6mMagnetic Field 0.4 TTheckness 10mmAperture 11078mm2Current 2100 A Current density 52.7 A/mm2

Chart1

-6620.652

-6643.619

-6667.392

-6683.05

-6698.721

-6717.105

-6729.61

-6740.334

-6749.663

127.014

738.1168

1350.216

1960.82

2571.46

3281.074

3761.783

4050.234

4243.625

4087.109

4084.466

4082.298

4080.297

4078.406

4076.614

4074.917

4073.313

4071.801

4070.379

4069.044

4067.794

4066.626

4065.537

4064.523

4063.581

4062.708

4061.905

4061.161

4060.475

4059.844

4059.265

4058.734

4058.249

4057.808

4057.407

4057.045

4056.718

4056.427

4056.168

4055.942

4055.745

4055.577

4055.437

4055.324

4055.237

4055.177

4055.143

4055.135

4055.153

4055.199

4055.272

4055.373

4055.505

4055.668

4055.863

4056.092

4056.357

4056.66

4057.002

4057.388

4057.819

4058.298

4058.828

4059.413

4060.056

4060.763

4061.535

4062.376

4063.291

4064.281

4065.352

4066.507

4067.749

4069.081

4070.505

4072.024

4073.642

4075.361

4077.177

4079.091

4081.099

4083.168

4213.048

4186.152

4094.112

3928.086

3313.594

2700.744

2088.97

1477.651

798.2006

262.3829

-6741.649

-2.423289

-2.344152

-2.264751

-2.186257

-2.107056

-2.032401

-1.956418

-1.882073

-1.813713

-1.745361

-1.683219

-1.62321

-1.565683

-1.513686

-1.461691

-1.416135

-1.371332

-1.329612

-1.291046

-1.253015

-1.219787

-1.186561

-1.15656

-1.127889

-1.100459

-1.075684

-1.050674

-1.029252

-1.007833

-0.987983

-0.9694722

-0.9513428

-0.9353743

-0.9194068

-0.9051421

-0.8914179

-0.8784279

-0.8667009

-0.8549286

-0.8449975

-0.8350673

-0.8260817

-0.8177852

-0.8097556

-0.8029631

-0.7961694

-0.7904583

-0.7850719

-0.7801459

-0.7761129

-0.7646255

-0.7646255

-0.7646255

-0.7622437

-0.7622437

-0.760424

-0.760424

-0.760424

Cm

Gs

ISPB Field

poi

X YBxBy? AdBy/dy dBy/dx dBx/dy

(cm)(cm)(G)(G)(G)(Gm)

9.0000.00E+00(6620.65)6.62E+033.39E+040.00E+00-1.93E+02-1.93E+02

9.1200.00E+00(6643.62)6.64E+033.47E+040.00E+00-1.92E+02-1.92E+02

9.2400.00E+00(6667.39)6.67E+033.55E+040.00E+00-1.32E+02-1.32E+02

9.3600.00E+00(6683.05)6.68E+033.63E+040.00E+00-1.31E+02-1.31E+02

9.4800.00E+00(6698.72)6.70E+033.71E+040.00E+00-1.30E+02-1.30E+02

9.6000.00E+00(6717.11)6.72E+033.79E+040.00E+00-1.05E+02-1.05E+02

9.7200.00E+00(6729.61)6.73E+033.87E+040.00E+00-1.04E+02-1.04E+02

9.8400.00E+00(6740.33)6.74E+033.95E+040.00E+00-7.61E+01-7.61E+01

9.9600.00E+00(6749.66)6.75E+034.03E+040.00E+00-7.54E+01-7.54E+01

10.0800.00E+00127.011.27E+024.06E+040.00E+004.66E+03-4.85E+02

10.1900.00E+00738.127.38E+024.06E+040.00E+005.12E+03-1.64E+01

10.3100.00E+001350.221.35E+034.05E+040.00E+005.12E+03-1.63E+01

10.4300.00E+001960.821.96E+034.03E+040.00E+005.12E+03-2.15E+01

10.5500.00E+002571.462.57E+034.00E+040.00E+005.10E+03-4.17E+01

10.6700.00E+003281.073.28E+033.96E+040.00E+005.81E+036.74E+02

10.7900.00E+003761.783.76E+033.92E+040.00E+002.80E+032.80E+03

10.9100.00E+004050.234.05E+033.87E+040.00E+004.16E+024.16E+02

11.0300.00E+004243.634.24E+033.82E+040.00E+00-6.42E+02-6.42E+02

11.1500.00E+004087.114.09E+033.77E+040.00E+00-2.36E+01-2.36E+01

11.2700.00E+004084.474.08E+033.72E+040.00E+00-1.85E+01-1.85E+01

11.3900.00E+004082.304.08E+033.68E+040.00E+00-1.69E+01-1.69E+01

11.5100.00E+004080.304.08E+033.63E+040.00E+00-1.60E+01-1.60E+01

11.6300.00E+004078.414.08E+033.58E+040.00E+00-1.57E+01-1.57E+01

11.7500.00E+004076.614.08E+033.53E+040.00E+00-1.48E+01-1.48E+01

11.8700.00E+004074.924.07E+033.48E+040.00E+00-1.40E+01-1.40E+01

11.9900.00E+004073.314.07E+033.43E+040.00E+00-1.32E+01-1.32E+01

12.1100.00E+004071.804.07E+033.38E+040.00E+00-1.24E+01-1.24E+01

12.2300.00E+004070.384.07E+033.33E+040.00E+00-1.16E+01-1.16E+01

12.3500.00E+004069.044.07E+033.29E+040.00E+00-1.08E+01-1.08E+01

12.4700.00E+004067.794.07E+033.24E+040.00E+00-1.01E+01-1.01E+01

12.5800.00E+004066.634.07E+033.19E+040.00E+00-9.35E+00-9.35E+00

12.7000.00E+004065.544.07E+033.14E+040.00E+00-8.67E+00-8.67E+00

12.8200.00E+004064.524.06E+033.09E+040.00E+00-8.02E+00-8.02E+00

12.9400.00E+004063.584.06E+033.04E+040.00E+00-7.40E+00-7.40E+00

13.0600.00E+004062.714.06E+032.99E+040.00E+00-6.82E+00-6.82E+00

13.1800.00E+004061.914.06E+032.95E+040.00E+00-6.63E+00-6.63E+00

13.3000.00E+004061.164.06E+032.90E+040.00E+00-6.09E+00-6.09E+00

13.4200.00E+004060.484.06E+032.85E+040.00E+00-5.58E+00-5.58E+00

13.5400.00E+004059.844.06E+032.80E+040.00E+00-5.11E+00-5.11E+00

13.6600.00E+004059.274.06E+032.75E+040.00E+00-4.66E+00-4.66E+00

13.7800.00E+004058.734.06E+032.70E+040.00E+00-4.24E+00-4.24E+00

13.9000.00E+004058.254.06E+032.65E+040.00E+00-3.85E+00-3.85E+00

14.0200.00E+004057.814.06E+032.61E+040.00E+00-3.48E+00-3.48E+00

14.1400.00E+004057.414.06E+032.56E+040.00E+00-3.13E+00-3.13E+00

14.2600.00E+004057.054.06E+032.51E+040.00E+00-2.81E+00-2.81E+00

14.3800.00E+004056.724.06E+032.46E+040.00E+00-2.50E+00-2.50E+00

14.5000.00E+004056.434.06E+032.41E+040.00E+00-2.21E+00-2.21E+00

14.6200.00E+004056.174.06E+032.36E+040.00E+00-1.93E+00-1.93E+00

14.7400.00E+004055.944.06E+032.32E+040.00E+00-1.84E+00-1.84E+00

14.8600.00E+004055.754.06E+032.27E+040.00E+00-1.58E+00-1.58E+00

14.9700.00E+004055.584.06E+032.22E+040.00E+00-1.33E+00-1.33E+00

15.0900.00E+004055.444.06E+032.17E+040.00E+00-1.08E+00-1.08E+00

15.2100.00E+004055.324.06E+032.12E+040.00E+00-8.47E-01-8.47E-01

15.3300.00E+004055.244.06E+032.07E+040.00E+00-6.14E-01-6.14E-01

15.4500.00E+004055.184.06E+032.02E+040.00E+00-3.83E-01-3.83E-01

15.5700.00E+004055.144.06E+031.98E+040.00E+00-1.53E-01-1.53E-01

15.6900.00E+004055.144.06E+031.93E+040.00E+007.95E-027.95E-02

15.8100.00E+004055.154.06E+031.88E+040.00E+003.15E-013.15E-01

15.9300.00E+004055.204.06E+031.83E+040.00E+005.57E-015.57E-01

16.0500.00E+004055.274.06E+031.78E+040.00E+008.06E-018.06E-01

16.1700.00E+004055.374.06E+031.73E+040.00E+008.94E-018.94E-01

16.2900.00E+004055.514.06E+031.69E+040.00E+001.16E+001.16E+00

16.4100.00E+004055.674.06E+031.64E+040.00E+001.43E+001.43E+00

16.5300.00E+004055.864.06E+031.59E+040.00E+001.72E+001.72E+00

16.6500.00E+004056.094.06E+031.54E+040.00E+002.02E+002.02E+00

16.7700.00E+004056.364.06E+031.49E+040.00E+002.35E+002.35E+00

16.8900.00E+004056.664.06E+031.44E+040.00E+002.69E+002.69E+00

17.0100.00E+004057.004.06E+031.39E+040.00E+003.06E+003.06E+00

17.1300.00E+004057.394.06E+031.35E+040.00E+003.45E+003.45E+00

17.2500.00E+004057.824.06E+031.30E+040.00E+003.87E+003.87E+00

17.3600.00E+004058.304.06E+031.25E+040.00E+004.31E+004.31E+00

17.4800.00E+004058.834.06E+031.20E+040.00E+004.79E+004.79E+00

17.6000.00E+004059.414.06E+031.15E+040.00E+005.30E+005.30E+00

17.7200.00E+004060.064.06E+031.10E+040.00E+005.48E+005.48E+00

17.8400.00E+004060.764.06E+031.06E+040.00E+006.03E+006.03E+00

17.9600.00E+004061.544.06E+031.01E+040.00E+006.62E+006.62E+00

18.0800.00E+004062.384.06E+039.58E+030.00E+007.25E+007.25E+00

18.2000.00E+004063.294.06E+039.10E+030.00E+007.90E+007.90E+00

18.3200.00E+004064.284.06E+038.61E+030.00E+008.60E+008.60E+00

18.4400.00E+004065.354.07E+038.13E+030.00E+009.33E+009.33E+00

18.5600.00E+004066.514.07E+037.64E+030.00E+001.01E+011.01E+01

18.6800.00E+004067.754.07E+037.15E+030.00E+001.09E+011.09E+01

18.8000.00E+004069.084.07E+036.67E+030.00E+001.17E+011.17E+01

18.9200.00E+004070.514.07E+036.18E+030.00E+001.25E+011.25E+01

19.0400.00E+004072.024.07E+035.70E+030.00E+001.34E+011.34E+01

19.1600.00E+004073.644.07E+035.21E+030.00E+001.37E+011.37E+01

19.2800.00E+004075.364.08E+034.72E+030.00E+001.46E+011.46E+01

19.4000.00E+004077.184.08E+034.23E+030.00E+001.55E+011.55E+01

19.5200.00E+004079.094.08E+033.75E+030.00E+001.63E+011.63E+01

19.6400.00E+004081.104.08E+033.26E+030.00E+001.72E+011.72E+01

19.7500.00E+004083.174.08E+032.77E+030.00E+001.75E+011.75E+01

19.8700.00E+004213.054.21E+032.28E+030.00E+001.44E+031.44E+03

19.9900.00E+004186.154.19E+031.78E+030.00E+001.59E+031.59E+03

20.1100.00E+004094.114.09E+031.29E+030.00E+00-2.63E+02-2.63E+02

20.2300.00E+003928.093.93E+037.92E+020.00E+00-4.63E+035.10E+02

20.3500.00E+003313.593.31E+033.54E+020.00E+00-5.13E+031.47E+01

20.4700.00E+002700.74-2.70E+035.59E+000.00E+00-5.12E+032.11E+01

20.5900.00E+002088.97-2.09E+032.92E+020.00E+00-5.12E+032.28E+01

20.7100.00E+001477.65-1.48E+035.05E+020.00E+00-5.10E+034.09E+01

20.8300.00E+00798.20-7.98E+026.40E+020.00E+00-5.47E+03-3.30E+02

20.9500.00E+00262.38-2.62E+027.02E+020.00E+00-2.40E+03-2.40E+03

21.0700.00E+00(6741.65)-6.74E+035.53E+020.00E+001.88E+011.88E+01

21.1900.00E+00(2.42)-2.42E+008.07E+000.00E+006.66E-016.66E-01

21.3100.00E+00(2.34)-2.34E+007.79E+000.00E+006.67E-016.67E-01

21.4300.00E+00(2.26)-2.26E+007.51E+000.00E+006.67E-016.67E-01

21.5500.00E+00(2.19)-2.19E+007.25E+000.00E+006.63E-016.63E-01

21.6700.00E+00(2.11)-2.11E+006.99E+000.00E+006.63E-016.63E-01

21.7900.00E+00(2.03)-2.03E+006.74E+000.00E+006.36E-016.36E-01

21.9100.00E+00(1.96)-1.96E+006.50E+000.00E+006.35E-016.35E-01

22.0300.00E+00(1.88)-1.88E+006.28E+000.00E+005.73E-015.73E-01

22.1400.00E+00(1.81)-1.81E+006.06E+000.00E+005.72E-015.72E-01

22.2600.00E+00(1.75)-1.75E+005.84E+000.00E+005.71E-015.71E-01

22.3800.00E+00(1.68)-1.68E+005.64E+000.00E+005.02E-015.02E-01

22.5000.00E+00(1.62)-1.62E+005.45E+000.00E+005.02E-015.02E-01

22.6200.00E+00(1.57)-1.57E+005.26E+000.00E+004.36E-014.36E-01

22.7400.00E+00(1.51)-1.51E+005.07E+000.00E+004.35E-014.35E-01

22.8600.00E+00(1.46)-1.46E+004.90E+000.00E+004.34E-014.34E-01

22.9800.00E+00(1.42)-1.42E+004.73E+000.00E+003.75E-013.75E-01

23.1000.00E+00(1.37)-1.37E+004.56E+000.00E+003.75E-013.75E-01

23.2200.00E+00(1.33)-1.33E+004.40E+000.00E+003.23E-013.23E-01

23.3400.00E+00(1.29)-1.29E+004.24E+000.00E+003.23E-013.23E-01

23.4600.00E+00(1.25)-1.25E+004.09E+000.00E+002.79E-012.79E-01

23.5800.00E+00(1.22)-1.22E+003.95E+000.00E+002.78E-012.78E-01

23.7000.00E+00(1.19)-1.19E+003.80E+000.00E+002.78E-012.78E-01

23.8200.00E+00(1.16)-1.16E+003.66E+000.00E+002.40E-012.40E-01

23.9400.00E+00(1.13)-1.13E+003.53E+000.00E+002.40E-012.40E-01

24.0600.00E+00(1.10)-1.10E+003.39E+000.00E+002.08E-012.08E-01

24.1800.00E+00(1.08)-1.08E+003.26E+000.00E+002.07E-012.07E-01

24.3000.00E+00(1.05)-1.05E+003.14E+000.00E+001.80E-011.80E-01

24.4200.00E+00(1.03)-1.03E+003.01E+000.00E+001.79E-011.79E-01

24.5300.00E+00(1.01)-1.01E+002.89E+000.00E+001.79E-011.79E-01

24.6500.00E+00(0.99)-9.88E-012.77E+000.00E+001.55E-011.55E-01

24.7700.00E+00(0.97)-9.69E-012.66E+000.00E+001.55E-011.55E-01

24.8900.00E+00(0.95)-9.51E-012.54E+000.00E+001.34E-011.34E-01

25.0100.00E+00(0.94)-9.35E-012.43E+000.00E+001.34E-011.34E-01

25.1300.00E+00(0.92)-9.19E-012.32E+000.00E+001.33E-011.33E-01

25.2500.00E+00(0.91)-9.05E-012.21E+000.00E+001.15E-011.15E-01

25.3700.00E+00(0.89)-8.91E-012.10E+000.00E+001.15E-011.15E-01

25.4900.00E+00(0.88)-8.78E-012.00E+000.00E+009.83E-029.83E-02

25.6100.00E+00(0.87)-8.67E-011.89E+000.00E+009.81E-029.81E-02

25.7300.00E+00(0.85)-8.55E-011.79E+000.00E+008.33E-028.33E-02

25.8500.00E+00(0.84)-8.45E-011.69E+000.00E+008.31E-028.31E-02

25.9700.00E+00(0.84)-8.35E-011.59E+000.00E+008.30E-028.30E-02

26.0900.00E+00(0.83)-8.26E-011.49E+000.00E+006.95E-026.95E-02

26.2100.00E+00(0.82)-8.18E-011.39E+000.00E+006.94E-026.94E-02

26.3300.00E+00(0.81)-8.10E-011.30E+000.00E+005.70E-025.70E-02

26.4500.00E+00(0.80)-8.03E-011.20E+000.00E+005.68E-025.68E-02

26.5700.00E+00(0.80)-7.96E-011.10E+000.00E+005.67E-025.67E-02

26.6900.00E+00(0.79)-7.90E-011.01E+000.00E+004.51E-024.51E-02

26.8100.00E+00(0.79)-7.85E-019.16E-010.00E+004.50E-024.50E-02

26.9200.00E+00(0.78)-7.80E-018.23E-010.00E+003.38E-023.38E-02

27.0400.00E+00(0.78)-7.76E-017.30E-010.00E+003.37E-023.37E-02

27.1600.00E+00(0.76)-7.65E-016.40E-010.00E+005.18E-025.18E-02

27.2800.00E+00(0.76)-7.65E-015.48E-010.00E+006.15E-026.15E-02

27.4000.00E+00(0.76)-7.65E-014.57E-010.00E+006.34E-026.34E-02

27.5200.00E+00(0.76)-7.62E-013.64E-010.00E+003.64E-023.64E-02

27.6400.00E+00(0.76)-7.62E-012.73E-010.00E+003.27E-023.27E-02

27.7600.00E+00(0.76)-7.60E-011.82E-010.00E+001.54E-021.54E-02

27.8800.00E+00(0.76)-7.60E-019.09E-020.00E+008.74E-038.74E-03

28.0000.00E+00(0.76)-7.60E-018.37E-140.00E+008.38E-158.38E-15

poi

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

Cm

Gs

ISPB Field

(5) Power Supplies System

Name

Number

IA

type

VV

PkW

I/I (24 hr)

V/V

O.B

2

1100

SCR

200

220

110-4

110-2

I.B

2

950

SCR

300

285

110-4

110-2

Q

120

170

ZVH

65

11

110-4

110-2

S

18

160

ZVH

75

12

110-3

110-2

O.BTO.BH

30

25

ZVH

10

0.25

110-3

110-2

O.BVI.BV

60

40

ZVH

26

1.04

110-3

110-2

I.BTI.BH

30

8

ZVH

10

0.08

110-3

110-2

Q1a

2

2200

ZVH

49

107.8

110-4

110-2

Q1b

2

1500

ZVH

49

73.5

110-4

110-2

OQ2IQ2

4

370

ZVH

25

9.25

110-4

110-2

Septum

2

1500

ZVH

55

82.5

110-4

110-2

SCB

1

700

ZVH

7

4.9

110-4

110-2

A-SOLS-SOL

2

700

ZVH

7

4.9

110-4

110-2

SCQ

2

700

ZVH

7

4.9

510-5

110-2

SCBTSCBVSQ

6

60

PWM Switch

13

0.78

110-3

110-2

IQ

6

ZVH

110-4

110-2

SkQ

40

ZVH

110-3

110-2

Total

339

3.6 Vacuum System The BEPCII poses two challenges to the vacuum system, one is vacuum pressure Arcs: 810-9TorrIR: 510-10Torr, other is the impedance. Vacuum pressure

Electron Ring Positron Ring

Vacuum Chamber Design

Vacuum Chamber Cross Section at a Dipole

_1072695859.dwg

_1072716557.dwg

3.6 Injection Kickers

3.7 Instrumentation and Feedback Beam Position Monitor Bunch Current Monitor Beam Feedback System Synchrotron Light Monitor IP beam position control

3.8 Control SystemVAX 4500CAMACPC subsystemsWS consoleEthernetPS, Vacuum, RFInjectionBeam diagnosticLinacBEPCII BEPC

(4) Budget and ScheduleThe budget of BEPCII project is estimated as 640 MRMB. It is scheduled to finish in 4 years.

(5) Summary BEPC has been well operated with many exciting HEP and SR results for 13 years since it was put into operation in 1989.BEPCII is proposed as micro-b plus multibunches with two rings and its design luminosity is order of magnitude higher than present BEPC in energy range of J/y, y and y. Some key technologies need to be developed to achieve the goal of BEPC II.The international collaboration will be promoted in order to accomplish this challenging and exciting project on schedule and budget.

May the EPICS02 be a Great Success !