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transcript
Bunch Frequency Multiplicationin the
CLIC Test Facility CTF 3
R. Corsini, L. Rinolfi, F. Tecker – CERN, SwitzerlandC. Biscari, A. Ghigo, M. Preger– INFN, Italy
P. Royer– Lausanne University, SwitzerlandA. Ferrari – Uppsala University, Sweden
Introduction to CTF 3
Bunch Frequency Multiplication
Bunch Combination Results
Conclusions
Frank Tecker Bunch Frequency Multiplication in the CLIC Test Facility CTF 3 PAC 2003, 15.5.2003
http://cern.ch/ctf3http://ps-div.web.cern.ch/ps-div/CLIC/Welcome.htmlhttp://cern.ch/ctf3http://www.cern.chhttp://cern.ch/teckerhttp://www.cern.ch/http://cern.ch/teckerhttp://ps-div.web.cern.ch/ps-div/CLIC/Welcome.htmlhttp://cern.ch/ctf3http://www-conf.slac.stanford.edu/pac03/
Introduction to CTF 3
CLIC: CompactLI near Collider (0.5–5 TeV)
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two beamacceleration scheme:
high charge, low energydrive beam(2 GeV)
produce RF power athigh frequency – 30 GHz
high gradient – 150 MV/m
low charge,high energy main beam(1.5 TeV)
CLIC TestFacility 3 addressesfeasibility issues:test ofdrive beam generation
combination of bunches byRF deflectors⇒ bunch frequency multiplication
RF power production at 30 GHz
test CLIC components
Frank Tecker Bunch Frequency Multiplication in the CLIC Test Facility CTF 3 PAC 2003, 15.5.2003
http://cern.ch/ctf3http://cern.ch/ctf3http://www.cern.chhttp://ps-div.web.cern.ch/ps-div/CLIC/Welcome.htmlhttp://ps-div.web.cern.ch/ps-div/CLIC/Welcome.htmlhttp://cern.ch/teckerhttp://ps-div.web.cern.ch/ps-div/CLIC/Welcome.htmlhttp://cern.ch/ctf3http://www-conf.slac.stanford.edu/pac03/
Frequency multiplication
basic principle of drive beam generation
transform very long pulses into many shortpulses withhigher power and higher frequency
useRF deflectorsto interleavebunches
⇒ double beam power⇒ double beam frequency
CTF3 deflector, INFN
CTF3 deflector, CERN
Frank Tecker Bunch Frequency Multiplication in the CLIC Test Facility CTF 3 PAC 2003, 15.5.2003
http://cern.ch/ctf3http://www.cern.chhttp://cern.ch/teckerhttp://ps-div.web.cern.ch/ps-div/CLIC/Welcome.htmlhttp://cern.ch/ctf3http://www-conf.slac.stanford.edu/pac03/
Preliminary phase of CTF 3 (2001–2002)
gun & bunchingsystem
Linac ( 8 structures )
matchingsection
isochronousinjection line
RF deflectors
streak camerameasurement
isochronous ring
total Length 1.7 µs - av. Pulse Current 0.3 A
Bunch spacing10 cm (333 ps)6.6 ns 420 ns
Pulse Length 6.6 nsav. Pulse Current 1.5 A
Bunch spacing 2 cm (67 ps)
Beam structurein linac
(up to 100 Hz)
Beam structureafter combination
Frank Tecker Bunch Frequency Multiplication in the CLIC Test Facility CTF 3 PAC 2003, 15.5.2003
http://cern.ch/ctf3http://cern.ch/ctf3http://www.cern.chhttp://cern.ch/teckerhttp://ps-div.web.cern.ch/ps-div/CLIC/Welcome.htmlhttp://cern.ch/ctf3http://www-conf.slac.stanford.edu/pac03/
Combination by RF deflectors in a ringC L I CC L I C
Four-Turn Ring InjectionFour-Turn Ring Injection
3rd
1st turn
λ�
2nd
λ� /4
injectionline
transverse deflector
field
localinner orbits
1���
deflector 2���
deflector
septum
4rd
• Want a factor 4 pulse compression &frequency multiplication
• Use transverse RF deflectorinjection in a ring
Bunch train combination by RF deflectors
Basic principle of bunch train combination by RF deflector injection in an isochronous ring
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Frank Tecker Bunch Frequency Multiplication in the CLIC Test Facility CTF 3 PAC 2003, 15.5.2003
http://cern.ch/ctf3http://www.cern.chhttp://cern.ch/teckerhttp://ps-div.web.cern.ch/ps-div/CLIC/Welcome.htmlhttp://cern.ch/ctf3http://www-conf.slac.stanford.edu/pac03/
CTF3 recombination factor 4 - 1 pulse
time
Frank Tecker Bunch Frequency Multiplication in the CLIC Test Facility CTF 3 PAC 2003, 15.5.2003
http://cern.ch/ctf3http://www.cern.chhttp://cern.ch/teckerhttp://ps-div.web.cern.ch/ps-div/CLIC/Welcome.htmlhttp://cern.ch/ctf3http://www-conf.slac.stanford.edu/pac03/
CTF3 recombination factor 4 - 2 pulses
time
Frank Tecker Bunch Frequency Multiplication in the CLIC Test Facility CTF 3 PAC 2003, 15.5.2003
http://cern.ch/ctf3http://www.cern.chhttp://cern.ch/teckerhttp://ps-div.web.cern.ch/ps-div/CLIC/Welcome.htmlhttp://cern.ch/ctf3http://www-conf.slac.stanford.edu/pac03/
CTF3 recombination factor 4 - 3 pulses
time
Frank Tecker Bunch Frequency Multiplication in the CLIC Test Facility CTF 3 PAC 2003, 15.5.2003
http://cern.ch/ctf3http://www.cern.chhttp://cern.ch/teckerhttp://ps-div.web.cern.ch/ps-div/CLIC/Welcome.htmlhttp://cern.ch/ctf3http://www-conf.slac.stanford.edu/pac03/
CTF3 recombination factor 4 - 4 pulses
time
Frank Tecker Bunch Frequency Multiplication in the CLIC Test Facility CTF 3 PAC 2003, 15.5.2003
http://cern.ch/ctf3http://www.cern.chhttp://cern.ch/teckerhttp://ps-div.web.cern.ch/ps-div/CLIC/Welcome.htmlhttp://cern.ch/ctf3http://www-conf.slac.stanford.edu/pac03/
Recombination factor 4 - beam current
Frank Tecker Bunch Frequency Multiplication in the CLIC Test Facility CTF 3 PAC 2003, 15.5.2003
http://cern.ch/ctf3http://www.cern.chhttp://cern.ch/teckerhttp://ps-div.web.cern.ch/ps-div/CLIC/Welcome.htmlhttp://cern.ch/ctf3http://www-conf.slac.stanford.edu/pac03/
CTF3 recombination factor 5
5 cm)(2nruht5
o = 0 mc
t
λ 1
/oλ
bunch distance 333 ps→ 67 psfrequency 3 GHz→ 15 GHz
Frank Tecker Bunch Frequency Multiplication in the CLIC Test Facility CTF 3 PAC 2003, 15.5.2003
http://cern.ch/ctf3http://www.cern.chhttp://cern.ch/tecker/ctf3/combi5anim.gifhttp://cern.ch/teckerhttp://ps-div.web.cern.ch/ps-div/CLIC/Welcome.htmlhttp://cern.ch/ctf3http://www-conf.slac.stanford.edu/pac03/
Conclusions
CTF 3 preliminary phase
bunch frequency multiplication by RF deflectorsdemonstratedfor factors 2 – 5 at low charge
crucial step for the CLIC study
CTF 3 initial phase
drive beam linac is being installed now (higher charge)
commissioning starts this month
Acknowledgements:
R. Corsini, A. Ferrari, L. Rinolfi, P. Royer
various CERN divisions and groups
Collaborations:INFN, Frascati, Italy – SLAC, USA – RAL, UK –IN2P3-LAL, France – Uppsala University, Sweden
Frank Tecker Bunch Frequency Multiplication in the CLIC Test Facility CTF 3 PAC 2003, 15.5.2003
http://cern.ch/ctf3http://www.cern.chhttp://cern.ch/teckerhttp://ps-div.web.cern.ch/ps-div/CLIC/Welcome.htmlhttp://cern.ch/ctf3http://www-conf.slac.stanford.edu/pac03/