r.m. jones (university of manchester/cockcroft inst.) on behalf of clic collaboration., estb...
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R.M. Jones (University of Manchester/Cockcroft Inst.) on behalf of CLIC Collaboration., ESTB Workshop, SLAC, 17th March 2011
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Collimator Wakefield Measurements
R.M. Jones, D. Schulte, R. Tomas, W. Wuensch for the CLIC teamThanks to
J. Pfingster, A. Grudiev, A. Latina, G. Sterbini, D Angal-Kalinin, J. Barranco, L. Fernandez, C. Hast, S. Jamison, J. Resta, G. Rumolo, A.
Seryi, N. Watson
R.M. Jones (University of Manchester/Cockcroft Inst.) on behalf of CLIC Collaboration., ESTB Workshop, SLAC, 17th March 2011
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R.M. Jones (University of Manchester/Cockcroft Inst.) on behalf of CLIC Collaboration., ESTB Workshop, SLAC, 17th March 2011
Beam Parameters at SLAC ESA and ILC
Parameter SLAC ESA ILC-500Repetition Rate 10 Hz 5 Hz
Energy 28.5 GeV 250 GeV
Bunch Charge 2.0 x 1010 2.0 x 1010
Bunch Length 300 mm 300 mm
Energy Spread 0.2% 0.1%
Bunches per train 1 (2*) 2820
Microbunch spacing
- (20-400ns*) 337 ns
R.M. Jones (University of Manchester/Cockcroft Inst.) on behalf of CLIC Collaboration., ESTB Workshop, SLAC, 17th March 2011
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In this case, it lays in the long bunch regime Formulae based on work of Gennady Stupakov, SLAC.
R.M. Jones (University of Manchester/Cockcroft Inst.) on behalf of CLIC Collaboration., ESTB Workshop, SLAC, 17th March 2011
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Ref W. Farabolini, Proc. Linac 2010, Tsukuba, Japan
CLIC Facility, CALIFES
CALIFES linac inside CLEX room at CERN
Beam parameters
Further results needed to confirm simulations
Worth emphasing that it is not yet clear when CALIFES will be available to make such measurements
Initial simulation of bunch deflection at CALIFES
R.M. Jones (University of Manchester/Cockcroft Inst.) on behalf of CLIC Collaboration., ESTB Workshop, SLAC, 17th March 2011
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R.M. Jones (University of Manchester/Cockcroft Inst.) on behalf of CLIC Collaboration., ESTB Workshop, SLAC, 17th March 2011
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T480“wakefield box”
ESA beamline
Collimator Hardware
R.M. Jones (University of Manchester/Cockcroft Inst.) on behalf of CLIC Collaboration., ESTB Workshop, SLAC, 17th March 2011Nigel Watson, 21 Oct 2010
ESA Wakefield measurements
Col. 12 a = 166 mradr = 1.4 mm
Ang
ular
kic
k (
V/p
C)
Collimator y (mm)
T4802007 data
T4802007 data
Kic
k fa
ctor
(V
/pC
/mm
)
E.M. predictionsGdfidL vs. ECHO(ESA collims. 1- 8)
E.M. predictionsGdfidL vs. ECHO(ESA collims. 1- 8)
Wakefields, survivability. Strong collaboration between SLAC and EUROTeV groups.
T480“wakefield box”
ESA beamline
Designed, modelled and tested collimators at SLAC ESA facility
Designed, modelled and tested collimators at SLAC ESA facility
R.M. Jones (University of Manchester/Cockcroft Inst.) on behalf of CLIC Collaboration., ESTB Workshop, SLAC, 17th March 2011Nigel Watson, 21 Oct 2010
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0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Collimator number
Kic
k f
acto
r [V
/pC
/mm
]
Experimental data
GdfidL 500 microns
GdfidL 1 mm
Summary, ESA T480 wakefield measurements
R.M. Jones (University of Manchester/Cockcroft Inst.) on behalf of CLIC Collaboration., ESTB Workshop, SLAC, 17th March 2011
Hardware Set-Up For ESTB
• At Least 25 of drift space between collimator and last BPM
• Collimators, support and sandwich already at SLAC• Collimators borrowed from STFC• Bunch length measurement is critical –Steve
Jamison (ASTeC/STFC) proposes electro-optic measurement (synergy with CLIC TDR)
• BPM resolution, hopefully in the 100 nm level (could be partially contributed by CERN)
R.M. Jones (University of Manchester/Cockcroft Inst.) on behalf of CLIC Collaboration., ESTB Workshop, SLAC, 17th March 2011
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R.M. Jones (University of Manchester/Cockcroft Inst.) on behalf of CLIC Collaboration., ESTB Workshop, SLAC, 17th March 2011
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People
• J. Barranco, L Fernandez, S. Jamison, J. Resta, G. Rumolo, H. Day (Univ of Manchester PhD student measuring LHC wakes), tbc (postdoc, Univ of Manchester), R.M. Jones, D. Shulte, A. Seryi
• Due to time constraints Univ. Birmingham (UK) will not take part.
• As in ESA, strong collaboration with one SLAC colleague will be important.
R.M. Jones (University of Manchester/Cockcroft Inst.) on behalf of CLIC Collaboration., ESTB Workshop, SLAC, 17th March 2011
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R.M. Jones (University of Manchester/Cockcroft Inst.) on behalf of CLIC Collaboration., ESTB Workshop, SLAC, 17th March 2011
Parameters required for Beam Tests
Beam parameters Value Comments
Particle Type e-/e+
Energy ~10-14GeV
Rep Rate 5Hz
Charge per pulse 100pC (~109)
Energy Spread <1%
Bunch length rms ~40m (CLIC ~44 m)
Beam spot size, x-y Nominal
Others (emittance, …)
Logistics RequirementsSpace requirements (H x W x L) Existing wakefield box (already at SLAC)Duration of Test and Shift Utilization Previous experience indicates 2 weeks.
Desired Calendar Dates Winter/Fall 2011/2012
To the presenter at the ESTB 2011 Workshop: please, fill in the table (at best) with the important parameters needed for your tests