University of Oslo and CLIC Short overview for first “NorduCLIC” meeting Erik Adli and Steinar Stapnes, University of Oslo May 19, 2008

History The University of Oslo joined CLIC collaboration by financing one Ph.D. project for work on CLIC Beam Dynamics (EA) The University of Oslo joined CLIC collaboration by financing one Ph.D. project for work on CLIC Beam Dynamics (EA) Initialized: autumn 2005 Initialized: autumn 2005 Started 100% summer 2006 Started 100% summer 2006 Funded by the Research Council of Norway Funded by the Research Council of Norway Main topic: Beam Dynamics for the CLIC Decelerator and the TBL Main topic: Beam Dynamics for the CLIC Decelerator and the TBL Planned completion: summer 2009 Planned completion: summer 2009 Collaboration formalized by signing the CLIC/CTF3 MoU at the start of 2008 Collaboration formalized by signing the CLIC/CTF3 MoU at the start of 2008 Delegate: S. Stapnes, Deputy: EA Delegate: S. Stapnes, Deputy: EA

The 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-N PETS  Ê = 35 MeV t b = 83ps  z = 1mm  z) P  (1/4) I 2 L pets 2 F(  ) 2 ( R’/Q)  b / v g = 139 MW t fill = (L PETS /v g )(1-  g ) g = 3ns Power extracted from beam (ss) Power extraction efficiency (ss)  = E in /E ext = PN PETS / IE/e = 67%

Some details Work is done under local supervision of D. Schulte (CLIC Beam Dynamics study leader) Work is done under local supervision of D. Schulte (CLIC Beam Dynamics study leader) Beam Dynamics simulations are performed with the tracking code PLACET (D. Schulte) Beam Dynamics simulations are performed with the tracking code PLACET (D. Schulte) To my knowledgde: the only tracking code that can simulate PETS To my knowledgde: the only tracking code that can simulate PETS To my knowledge: we are the only team in the world performing these kind of simulations To my knowledge: we are the only team in the world performing these kind of simulations Working place is CERN Working place is CERN In my opinion: necessary to be integrated t CERN, and stay most of the time in order to do this work efficiently In my opinion: necessary to be integrated t CERN, and stay most of the time in order to do this work efficiently

Experimental tests of beam dynamics studies The CTF3 Test Beam Line (TBL) is to verify beam stability under deceleration, and to benchmark simulation code The CTF3 Test Beam Line (TBL) is to verify beam stability under deceleration, and to benchmark simulation code 16 PETS in series 16 PETS in series Construction starts in 2008, but completion has been postponed to ~ 2010 Construction starts in 2008, but completion has been postponed to ~ 2010 Problem for the current University of Oslo project: far beyond Ph.D. deadline (as well as current funding) Problem for the current University of Oslo project: far beyond Ph.D. deadline (as well as current funding) Another possibiliy to test the effect of PETS on the beam might be the Two Beam Test Stand Another possibiliy to test the effect of PETS on the beam might be the Two Beam Test Stand Discussions about cooperation with University of Uppsala (M. Johnson, R. Ruber, V. Ziemann +++) about this, with positive results Discussions about cooperation with University of Uppsala (M. Johnson, R. Ruber, V. Ziemann +++) about this, with positive results Still open question if CTF3 beam quality will allow good measurement of the effect of only one PETS Still open question if CTF3 beam quality will allow good measurement of the 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 activites We are also working on other topics related to the TBL and the Decelerator We are also working on other topics related to the TBL and the Decelerator 1) Beam instrumentation specifications for TBL and Decelerator Special instrumentation needed in order to verify the effect on deceleration on the beam Special instrumentation needed in order to verify the effect on deceleration on the beam Work in progress Work in progress (From T. Lefevre)

Complementary activites 2) Testing of Beam Based Alignment schemes in CTF3 The CLIC decelerator will probably needed advanced beam based alignment schemes, like Dispersion Free Steering The CLIC decelerator will probably needed advanced beam based alignment schemes, like Dispersion Free Steering Tests have been performed on the CTF3 linac, and will be performed on the TBL Tests have been performed on the CTF3 linac, and will be performed on the TBL Work in progress Work in progress

Summary The work of the University of Oslo currently includes one full time Ph.D. post (EA) + management (S. Stapnes) The work of the University of Oslo currently includes one full time Ph.D. post (EA) + management (S. Stapnes) Work focusses on all aspects of deceleration Work focusses on all aspects of deceleration Our key competence (under build-up) includes Our key competence (under build-up) includes Beam Dynamics in general, including collective effects Beam Dynamics in general, including collective effects Tracking codes for linear colliders (in particular PLACET) Tracking codes for linear colliders (in particular PLACET) End of this work package: summer 2009 End of this work package: summer 2009