R.M. Jones (University of Manchester/Cockcroft Inst.) on behalf of CLIC Collaboration., ESTB Workshop, SLAC, 17th March 2011

1

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

2

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

4

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

5

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

6

R.M. Jones (University of Manchester/Cockcroft Inst.) on behalf of CLIC Collaboration., ESTB Workshop, SLAC, 17th March 2011

7

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

0

1

2

3

4

5

6

7

8

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

11

R.M. Jones (University of Manchester/Cockcroft Inst.) on behalf of CLIC Collaboration., ESTB Workshop, SLAC, 17th March 2011

12

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

13

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