University of Oslo and CLIC University of Oslo and CLIC Short overview for first “NorduCLIC” meetingShort overview for first “NorduCLIC” meeting

Erik Adli and Steinar Stapnes, University of OsloErik Adli and Steinar Stapnes, University of OsloMay 19, 2008May 19, 2008

HistoryHistory The University of Oslo joined CLIC collaboration by The University of Oslo joined CLIC collaboration by

financing one Ph.D. project for work on CLIC Beam financing one Ph.D. project for work on CLIC Beam Dynamics (EA)Dynamics (EA) Initialized: autumn 2005Initialized: autumn 2005 Started 100% summer 2006Started 100% summer 2006 Funded by the Research Council of NorwayFunded by the Research Council of Norway Main topic: Beam Dynamics for the CLIC Decelerator and the Main topic: Beam Dynamics for the CLIC Decelerator and the

TBLTBL Planned completion: summer 2009Planned completion: summer 2009

Collaboration formalized by signing the CLIC/CTF3 Collaboration formalized by signing the CLIC/CTF3 MoU at the start of 2008MoU at the start of 2008 Delegate: S. Stapnes, Deputy: EADelegate: S. Stapnes, Deputy: EA

The CLIC deceleratorThe CLIC decelerator

The decelerator

CTF3 and TBL

TBL lattice:

16 units of one of each:

• PETS w/ coupler

• Quad

• BPM

Scope: Decelerator Beam Dynamics TBL/decelerator key components: the PETS PETS are designed by CERN AB/RF, including wake

field modes

Our beam-dynamics work focuses on the effect of the PETS on the beam Stability ( <- break down effects in PETS ?) Uniform loss free transport Beam based alignment (a necessity)

Slide: I. Syratchev

The effect of deceleration – in one slide

S=(E-Ě) / E = 70%

E

Ě

Ě = E(1-S)=E-NPETSÊ = 35 MeV tb = 83ps z = 1mm

z)

P P (1/4) I (1/4) I2 2 LLpetspets2 2 F(F())2 (2 (R’/Q) R’/Q) bb / v / vgg = 139 MW = 139 MW

ttfillfill = (L = (LPETSPETS/v/vgg)(1-)(1-gg) ) gg = 3ns = 3ns

Power extracted from beam (ss) Power extraction efficiency (ss)

= E= Einin/E/Eext ext = PN= PNPETSPETS / IE/e = 67% / IE/e = 67%

Some detailsSome details Work is done under local supervision of D. Schulte Work is done under local supervision of D. Schulte

(CLIC Beam Dynamics study leader)(CLIC Beam Dynamics study leader)

Beam Dynamics simulations are performed with the Beam Dynamics simulations are performed with the tracking code PLACET (D. Schulte)tracking code PLACET (D. Schulte) To my knowledgde: the only tracking code that can simulate To my knowledgde: the only tracking code that can simulate

PETSPETS To my knowledge: we are the only team in the world To my knowledge: we are the only team in the world

performing these kind of simulationsperforming these kind of simulations

Working place is CERNWorking place is CERN In my opinion: necessary to be integrated t CERN, and stay most of the In my opinion: necessary to be integrated t CERN, and stay most of the

time in order to do this work efficientlytime in order to do this work efficiently

Experimental tests of beam Experimental tests of beam dynamics studiesdynamics studies

The CTF3 Test Beam Line (TBL) is to verify beam The CTF3 Test Beam Line (TBL) is to verify beam stability under deceleration, and to benchmark stability under deceleration, and to benchmark simulation codesimulation code

16 PETS in series16 PETS in series Construction starts in 2008, but completion has been Construction starts in 2008, but completion has been

postponed to ~ 2010postponed to ~ 2010 Problem for the current University of Oslo project: far beyond Ph.D. deadline (as Problem for the current University of Oslo project: far beyond Ph.D. deadline (as

well as current funding)well as current funding)

Another possibiliy to test the effect of PETS on the Another possibiliy to test the effect of PETS on the beam might be the Two Beam Test Standbeam might be the Two Beam Test Stand Discussions about cooperation with University of Uppsala (M. Johnson, R. Discussions about cooperation with University of Uppsala (M. Johnson, R.

Ruber, V. Ziemann +++) about this, with positive resultsRuber, V. Ziemann +++) about this, with positive results Still open question if CTF3 beam quality will allow good measurement of the Still open question if CTF3 beam quality will allow good measurement of the

effect of only one PETS effect of only one PETS

Short-term: effect of 1 PETS In order to prepare for TBL we should measure as much as

possible already 1 PETS Where? Dedicated instrumentation after TBL 1 PETS? TBTS?

Examples of 1 PETS beam dynamics measurements:1) measure dipole mode, scanning of offset beam

verify with simulations steer to constant offset [0-5 mm] in order to give an indication of amplitude of transverse modes (dipole modes +

higher order modes) (1 mm gives ~0.1mrad – IF models are right)

2) measure extraction dependence of parameters Should be possible to resolve even for 1 PETS (and E/E=1%)

3) phase-space Verify simulations

Complementary activitesComplementary activites We are also working on other topics related to We are also working on other topics related to

the TBL and the Deceleratorthe TBL and the Decelerator

1) Beam instrumentation specifications for TBL 1) Beam instrumentation specifications for TBL and Deceleratorand Decelerator Special instrumentation needed in order to verify the effect on Special instrumentation needed in order to verify the effect on

deceleration on the beamdeceleration on the beam Work in progressWork in progress

(From T. Lefevre)

Complementary activitesComplementary activites2) Testing of Beam Based Alignment schemes in 2) Testing of Beam Based Alignment schemes in

CTF3CTF3 The CLIC decelerator will probably needed advanced beam based The CLIC decelerator will probably needed advanced beam based

alignment schemes, like Dispersion Free Steeringalignment schemes, like Dispersion Free Steering Tests have been performed on the CTF3 linac, and will be performed on Tests have been performed on the CTF3 linac, and will be performed on

the TBLthe TBL Work in progressWork in progress

SummarySummary The work of the University of Oslo currently The work of the University of Oslo currently

includes one full time Ph.D. post (EA) + includes one full time Ph.D. post (EA) + management (S. Stapnes)management (S. Stapnes)

Work focusses on all aspects of decelerationWork focusses on all aspects of deceleration Our key competence (under build-up) includesOur key competence (under build-up) includes

Beam Dynamics in general, including collective Beam Dynamics in general, including collective effectseffects

Tracking codes for linear colliders (in particular Tracking codes for linear colliders (in particular PLACET)PLACET)

End of this work package: summer 2009End of this work package: summer 2009