Bunch shorting scheme andscheme of extraction kicker in the ATF

DR using RF technology

Vladimir VogelKEK

April 25, 2005

C and X band 10nSec, (5.0 nSec)

Load

714 MHz

11.2 nSec

10 nSec RF11424MHz

714 MHz

Wave length (mm)0 5 10 15 20 25

-1.5

-1.0

-0.5

0.0

0.5

1.0

1.5

Septum, or small voltage kicker

E=E0(1+0.015)

E=E0+(20Mev +/- 2%) 4, p-p

z=4mm,E=20Mev,= 10 nSec, f=450MHz E=1.5%

U=sin(C-band)+0.32*sin(X-band) = 90 degree

Wave length (mm)0 5 10 15 20 25 30 35 40 45 50 55

Am

pitu

de

-1.5

-1.0

-0.5

0.0

0.5

1.0

5= 20mm

Bunch length, = 4mm

714 MHz 714 MHz

Wave length (mm)0 5 10 15 20 25

-1.5

-1.0

-0.5

0.0

0.5

1.0

1.5

C band

20 0

0

0

*cos( ) * ( ) 1UUaddN

U

N

Accelerate voltage

Accelerate phase

Harmonic number

Present Bunch length

Start

Length (mm)0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110

Eef

f (kV

)

0

40

80

120

160

200

240

280

320

360

400

C band, 8mm-4mm

100kV

0 kV

z ~ (Urf)^0.5

*2* *shE R P L =1 m, P = 4 kW, U = 167 kV

Single cell cavity, for 150kV, P=60 kW !

11ns

RF

377ns

10 MW X- band Klystronf = 4%

High group velocityC- band AC

Low reflection10 MW load

modulator, U=230kV, I=525A

e-

~10MW

377*2820=1.063ms

HV

RF

Low efficiency layout,Paver. = 600 kW

1ns

High group velocityX- band AC

10 MW C - band Klystronf = 8%

60 ns

15ns

11ns

HV

RF

377ns

10 MW KlystronC-bandf = 8%

3 db hybrid40MW

(377-15) nsdelay line

10 MW +/-90 degree phase shifterTsw. < 377ns

High group velocityC-band and X-band AC

Low reflection10 MW load

IGBT induction type modulator, U=230kV, I=350A

e-

10MW

~10MW

1 2 3 4

377*4=1508ns

HV

RF

High efficiency layout,Paver. = 68kW

1MW 1MW 1MW 1MW

1MW KlystronX-band f = 4%

Propagation of TE01 and TE02 modes through cooper circular waveguide,D120mm x L110m. Experimental results:

TE01 efficiency 97.10 %TE02 efficiency 90.63%

Loss:TE01 - 2.90% (theory 2.36% )TE02 – 8.96% (theory 8.62%)

S.Kazakov, A.Lunin, 2003

Passband of X-band travelling-wave mixed-mode window

X-band TW mixed-mode window

S.Kazakov

Passband of X-band pillbox window

X-band pillbox window

S.Kazakov

PPM#4A, F = 11424MHz, Pout ~ 30 MW

Time (Sec)-1.0e-8 -5.0e-9 0.0 5.0e-9 1.0e-8 1.5e-8 2.0e-8 2.5e-8 3.0e-8 3.5e-8 4.0e-8

Pin

, Pou

t (V

)

-0.4

-0.3

-0.2

-0.1

0.0

PinPout L2Pout L1

August 31, 2004

PPM#4a, U = 500kV, Tp= 30, 40, 100 nSec, Pin=-17dbm, -6dbm

Frequency (MHz) -11000MHz320 340 360 380 400 420 440 460 480 500 520 540

Pou

t L1,

L2

0

50

100

150

200

250

300

350

L1 (Pin -17dbm) 40 nSec L2 (Pin -17dbm) 40nSec L1 (Pin -6dbm) 30 nSec L2 (Pin -6dbm) 30nSec L1 (Pin -8dbm) 100hSec L1 (Pin -8dbm) 100nSec (L1+L2)/2

(mV

)

4000mm

U=230kV, I=350A, T=60nSec,Trise~60 nSec

ILC bunch spacing in DR = 11.2 (5.6) nS, DR circumference 9.52 (4.76) km

• Four Structure, L=0.5 m, Vgr~0.15, a/~ 0.3, E = 4*5 =20 Mev

• Four Klystrons, pulse length ~ 10 nSec, f = 8%, Pout ~10 MW

• Repetition rate (2.65/4) MHz, (with delay lines), Pav.=4*10kW

• IGBT modulator for 4 klystrons, 230kV, 350A, Pav=60kW

• DR one turn time ~ 34.7 uS, damp. ~ 25 mS, Ndr = 735*4, (LC X-band N = ~12 000, a/)