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Bunch shorting scheme and scheme of extraction kicker in the ATF DR using RF technology

Bunch shorting scheme and scheme of extraction kicker in the ATF DR using RF technology. Vladimir Vogel KEK April 25, 2005. s z=4mm, D E=20Mev, T = 10 nSec, D f=450MHz. D E=1.5%. Septum, or small voltage kicker. 714 MHz. 714 MHz. 10 nSec. RF 11424MHz. E=E0+(20Mev +/- 2%)

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Bunch shorting scheme and scheme of extraction kicker in the ATF DR using RF technology

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  1. Bunch shorting scheme andscheme of extraction kicker in the ATF DR using RF technology Vladimir Vogel KEK April 25, 2005

  2. sz=4mm, DE=20Mev, T = 10 nSec, Df=450MHz DE=1.5% Septum, or small voltage kicker 714 MHz 714 MHz 10 nSec RF 11424MHz E=E0+(20Mev +/- 2%) 4s, p-p Load C and X band 10nSec, (5.0 nSec) 11.2 nSec E=E0(1+0.015)

  3. Bunch length, s = 4mm 5s = 20mm

  4. Accelerate voltage Accelerate phase 714 MHz 714 MHz Harmonic number Present Bunch length C band, 8mm-4mm 100kV 0 kV Start C band sz ~ (Urf)^0.5

  5. L =1 m, P = 4 kW, U = 167 kV Single cell cavity, for 150kV,P=60 kW !

  6. Low efficiency layout, Paver. = 600 kW e- 11ns Low reflection 10 MW load RF 1ns High group velocity C- band AC modulator, U=230kV, I=525A 377ns RF High group velocity X- band AC ~10MW 10 MW X- band Klystron Df = 4% HV 10 MW C - band Klystron Df = 8% 377*2820=1.063ms

  7. High efficiency layout, Paver. = 68kW e- Low reflection 10 MW load 1MW 1MW 1MW 1MW 377ns RF High group velocity C-band and X-band AC ~10MW 10 MW +/-90 degree phase shifter Tsw. < 377ns HV 1 2 3 4 377*4=1508ns (377-15) ns delay line 11ns 3 db hybrid 40MW RF 10MW 10 MW Klystron C-bandDf = 8% HV 15ns 1MW Klystron X-bandDf = 4% 60 ns IGBT induction type modulator, U=230kV, I=350A

  8. Propagation of TE01 and TE02 modes through cooper circular waveguide, D120mm x L110m. Experimental results: Loss: TE01 - 2.90% (theory 2.36% ) TE02 – 8.96% (theory 8.62%) TE01 efficiency 97.10 % TE02 efficiency 90.63% S.Kazakov, A.Lunin, 2003

  9. X-band TW mixed-mode window Passband of X-band travelling-wave mixed-mode window S.Kazakov

  10. X-band pillbox window Passband of X-band pillbox window S.Kazakov

  11. (mV)

  12. 4000mm U=230kV, I=350A, T=60nSec, Trise~60 nSec

  13. 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/l ~ 0.3, DE = 4*5 =20 Mev • Four Klystrons, pulse length~ 10 nSec, Df = 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, tdamp. ~ 25 mS, Ndr = 735*4, (LC X-band N = ~12 000, a/l=0.17)

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