A Brief Introduction to the CLIC Study

W. WuenschTUM visit8-6-2009

What is the CLIC study?A collaboration lead by CERN to develop the technology for a next generation high-energy physics facility – TeV range e-/e+ linear collider.

ECM should cover range from ILC to LHC maximum reach and beyond ECM = 0.5-3 TeV,

L > few 1034 cm-2 with acceptable background and energy spread

Design compatible with maximum length ~ 50 km

Affordable!

Total power consumption < 500 MW

Physics motivation:

"Physics at the CLIC Multi-TeV Linear Collider: report of the CLIC Physics Working Group,“ CERN report 2004-5

Present goal:

Demonstrate all key feasibility issues and document in a CDR by 2010

http://clic-study.web.cern.ch/CLIC-Study/

CLIC Layout 3 TeV

Two-beam module

G. Riddone, ACE09, 27/05/2009

4All 3D models made by A. Samoshkin

The CLIC world wide collaboration

5EPAC 2008 CLIC / CTF3 G.Geschonke, CERN

Helsinki Institute of Physics (Finland) IAP (Russia)IAP NASU (Ukraine)Instituto de Fisica Corpuscular (Spain)INFN / LNF (Italy)J.Adams Institute, (UK)

Oslo University (Norway)PSI (Switzerland),Polytech. University of Catalonia (Spain)RRCAT-Indore (India)Royal Holloway, Univ. London, (UK) SLAC (USA)Uppsala University (Sweden)

Ankara University (Turkey)BINP (Russia)CERNCIEMAT (Spain)Cockcroft Institute (UK)Gazi Universities (Turkey)IRFU/Saclay (France)

JINR (Russia)JLAB (USA) KEK (Japan) LAL/Orsay (France) LAPP/ESIA (France)NCP (Pakistan)North-West. Univ. Illinois (USA)

Primary areas of accelerator R&D in the CLIC study

• Beam physics – Overall machine design and optimization. Complex simulations of many the effects which can drive instabilities. Ensure sub-nm final beam size, 0.2 degree phase stability.• CTF3 experimental facility – drive beam generation, accelerator physics, high beam powers and efficiency, operation and protection.• High-power rf structures – X-band structures with 150 MW generation and 100 MV/m acceleration. Structure design to prototype testing.• High-precision mechanical alignment and stabilization – Microns and sub-nanometer respectively. System design and demonstration.• Subsystem design and integration• Cost studies

Some areas of collaboration on areas of potential interest to TUM,

RF structure development• Electromagnetic computation – rf design, wakefields, HOM damping, rf components• Test structure program – fabrication, high-power testing• Fundamental breakdown physics studies – simulation, experiment and development of scaling laws• Precision manufacture and assembly – micron tolerances in complex 3-D geometries, mechanical control, mass production

Phase stabilization – 0.2 degree at 12 GHz (14 µm, 50 fs) timing stability over large distances, 10’s of km, and times, hundreds of µsec. RF structure design, phase detection, beam-feedback implementation.

Active alignment – 5-10 µm precision over distances up to 100 m or so.

Mechanical stabilization – 1 nm in the 4000 main linac quadrupoles and 0.1 nm in the final focusing quadrupoles.

Instrumentation – Huge numbers, 100s of thousands, of signals from beam position monitors, profile monitors, rf signals.

Two T18_VG2.4_DISC Structures

Structure for KEK Test

Structure for SLAC Test

95 100 105 110 11510

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Unloaded Gradient: MV/m

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BKD Rate for 230ns

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Gradient at 2e-6/pulse/m for 230ns pulse

Experiment DataPower Fit

For Constant Breakdown Rate

Unloaded Gradient at Different Conditioning Times

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C. Adolphsen

I. Syratchev, 4th ACE meeting, CERN, May 2009.

PETS high power tests at SLAC

Assembly of the eight PETS bars.

11.424 GHz PETS ready PETS installed into the ASTA test area at SLAC

S12i

A1i 3 SH

i ph1

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11.25 11.35 11.45 11.55 11.65 11.7540

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11. 424 GHz PETS measurements after final assembly

I. Syratchev, 4th ACE meeting, CERN, May 2009.

ASTA PETS processing history In general, the PETS has been processing up in power well.

Beginning 12.05.09 processing of PETS with 133 ns we end up with 180MW on evening of 20.05.0921.05.09 widened pulse to 266n s and have processed up to 103MW so far.Vacuum activity mostly in output end of PETS structure.

Jim Lewandowski (SLAC)130 MW

103 MW

133 ns

266 ns

Example of the pulses envelopes in ASTA

“short”

“long”

135 MW (CLIC 3 TeV target)

153 MW (CLIC 0.5 TeV target)

266 ns 266 ns133 ns

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TBTS PETS,140 ns flat,25 minutes.

PETS 1st run (winter 2008/09) PETS 2nd run (May 2009…)