VEPP-5 POJECT Present Status

VEPP-5 POJECTPresent Status

R.Gromov

BINP, Novosirisk, Russia

Layout of VEPP-5 injection complex

Forinjector parameters

Beams energy MeV 510

Electrons per bunch Positrons per bunch

1011

109

Repetition rate Hz 50 Energy spread for e- Energy spread for e+

% %

±1 ±3

RF frequency MHz 2856 Klystron pulse power MW 63

Storage Ring ParametersEnergy MeV 510

Circumference m 27.40

Repetition rate MGz 10.9375

Injection rate Hz 50

Extraction rate Hz 1 - 4

Dumping time Vertical Horizontal Longitudinal

ms

17.5 11.3 11.9

Beam Parameters in Storage RingInjection beam

Energy spread Emittance Length

% mrad·cm cm

1 1.5 2.5

Extraction beam

Energy spread x-emittance z-emittance Length

% mkrad·cm mkrad·cm cm

0.07 2.3 0.5 0.4

Frequency f 2855.5 МГцField mode Quality factor Q0 1.32104

Gruop velocity Vgr 0.021CShunt impedance Rsh 51 МОм /мTime constant of accelerating structure

0 = 2Q0/ 1.47 мксDamping factor of accelerating structure = 1/(0Vgr ) 0.108 1/мLength of AS +2 WTT

L 2.93 мDamping factor L 0.316Filling time Tf =L/ Vgr 0.465 мкс

Parameters of accelerating structure

Input power

To acceleratingstructure Resonator 2

Resonator 1

Diameter of the cavity D 196 ммHeight of the cavity H 346.6 ммMain frequency f0 2856 МГцBand width f 5 МГц f/H 2.75 МГц/ммQuality factor Q0 53200Coupling coefficient with supplywaveguide

5.84

Time constant of the cavity 5.93 мксTime constant of loaded cavity TC = 0/(1+)

0.87 мкс

Moment of phase jump by 1800 3 мксRF pulse duration 3.5 мксMultiply factor of voltage К0 2.67

The dependence of RF-amplitude along the AS at different time moment

zaSLEDshgen e

v

ztPRtzE

2-

‹р 0 -2=),( ,

at shR - shunt impedance,

- attenuation coefficient, t,PtP SLEDSLED 0 0 - incoming RF power from SLED

The dependence of wake field amplitude along the ASat different time moment

zL

Lzvt-te

vt-tze

tt

IRtzE

grb

tt

grbz

b

shbA

b

at 0

at 1

0at 1

at 0

2

2 sin

,0

0

at bt - bunch incoming time,

A0 - time constant,

grv - group velocity ,

- longitudinal bunch size.

The dependence of accelerating field along the ASat different time moment

)t,zEcost,zEt,zE bgentot

The dependence of particles energyat their incoming time

L

tot dzt,zEtU0

Short beam test results

Max. beam energy MeV 105

Average accelerating rate MeV/m 35

Repetition rate Hz 50

Beam puls length ns 2

Electrons per bunch 2·1010

Energy spread % ±0.5

88МэВ 103МэВ