Bunch shorting scheme and scheme of extraction kicker in the ATF DR using RF technology
description
Transcript of Bunch shorting scheme and scheme of extraction kicker in the ATF DR using RF technology
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/)