shorter bunch length in atf dr and x band extraction circuit
DESCRIPTION
Shorter bunch length in ATF DR and X band extraction circuit. Vladimir Vogel KEK March 7, 2005 ATF2 meeting. Accelerate voltage. Accelerate phase. 714 MHz. 714 MHz. Harmonic number. Present Bunch length. C band, 8mm-4mm. Start. F.J. Decker, and all. C band. L =1 m, P = 4 kW - PowerPoint PPT PresentationTRANSCRIPT
Shorter bunch length in ATF DR and X band extraction circuit
Vladimir VogelKEK
March 7, 2005ATF2 meeting
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( )* ( ) 1
UUadd
N
U
N
Accelerate voltageAccelerate 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 (k
V)
0
40
80
120
160
200
240
280
320
360
400
C band, 8mm-4mm
F.J. Decker, and all.
*2* *shE R P
L =1 m, P = 4 kWU = 167 kV
Single cell cavityFor 150kV, P=60 kW !
714 MHz 714 MHzWave length (mm)
0 5 10 15 20 25-1.5
-1.0
-0.5
0.0
0.5
1.0
1.5
C band P=4kW
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 (k
V)
0
40
80
120
160
200
240
280
320
360
400
C + X band4mm-2mm
X band P=1kW
X band 60 MW, 20nSec
Load
714 MHz
11.2 nSec
20 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
C band 8mm-4mm, 4kW - CW
Septum, or small voltage kicker
X band 4mm-2mm, 1kW CW
dE=1%
4 SET’s
August 31, 2004
PPM#4a, U = 500kV, Tp= 30, 40, 100 nSec, Pin=-17dbm, -6dbm
Frequency (MHz) -11000MHz
320 340 360 380 400 420 440 460 480 500 520 540
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
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
bunch spacing in DR = 11.2 (5.6) nS, DR circumference 4.76 (2.38) km
• Structure 4* L=0.4 m, Vgr~0.2, a/~ 0.3, E ~16 Mev
• Klystrons number 4 , pulse length ~ 100 nSec, Pout ~15 MW
• Repetition rate 2.65/4 MHz, (with delay lines), Pav.=4*15kW
• IGBT modulator for 4 klystrons, 270kV, 4*112A
• DR one turn time ~ 15.8 S, dam. ~ 25 mS, Ndr = 1580, (LC X-band N = ~12 000)