Measurements, ideas, curiosities

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Measurements, ideas, curiosities

• the straight path to high-energy physics

Complement to the presentation on Linear
Colliders ILC and CLIC
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Linear Collider parameters(from the
ILC-TRC/Second Report 2003)
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The technology choice

• SC vs NC projects in 1994 ?s 500 GeV

TESLA SBLC JLC-S JLC-C JLC-X NLC VLEPP CLIC
f GHz 1.3 3.0 2.8 5.7 11.4 11.4 14.0 30.0
L?1033 cm-2s-1 6 4 4 9 5 7 9 1-5
PbeamMW 16.5 7.3 1.3 4.3 3.2 4.2 2.4 1-4
PAC MW 164 139 118 209 114 103 57 100
gey?10-8m 100 50 4.8 4.8 4.8 5 7.5 15
synm 64 28 3 3 3 3.2 4 7.4
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The technology choice

• SC vs NC projects in 2003 ?s 500 GeV

TESLA SBLC JLC-S JLC-C JLC-X/NLC VLEPP CLIC
f GHz 1.3 5.7 11.4 30.0
L?1033 cm-2s-1 34 14 20 21
PbeamMW 11.3 5.8 6.9 4.9
PAC MW 140 233 195 175
gey?10-8m 3 4 4 1
synm 5 4 3 1.2
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BASIC FEATURES OF CLIC

• Modular design, can be built in stages

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CLIC MAIN PARAMETERS at 3 TeV
Center of mass energy Ecm 3000 GeV
Main Linac RF Frequency fRF 30 GHz
Luminosity L 6.5 1034 cm-2 s-1
Luminosity (in 1 of energy) L99 3.3 1034 cm-2 s-1
Linac repetition rate frep   150 Hz
No. of particles / bunch Nb 2.56  109
No. of bunches / pulse kb 220  
Bunch separation ?tb 0.267 (8 periods) ns
Bunch train length ttrain 58.4 ns
Beam power / beam Pb   20.4 MW
Unloaded / loaded gradient Gunl/l 172 / 150  MV/m
Overall two linac length llinac 28  km
Total beam delivery length lBD 2 x 2.6  km
Proposed site length ltot   33.2 km
Total site AC power Ptot 418 MW
Wall plug (RF) to main beam power efficiency ?tot 12.5 
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THE CLIC TECHNOLOGY-RELATED KEY ISSUESAS POINTED
OUT BY ILC-TRC 2003
R1 Feasibility

• R1.2 Validation of drive beam generation scheme
  with fully loaded linac operation
• R1.1 Test of damped accelerating structure at
  design gradient and pulse length
• R1.3 Design and test of damped ON/OFF power
  extraction structure

R2 Design finalization

• R2.1 Developments of structures with
  hard-breaking materials (W, Mo)
• R2.2 Validation of stability and losses of DB
  decelerator Design of machine protection system
• R2.3 Test of relevant linac sub-unit with beam
• R2.4 Validation of drive beam 40 MW, 937 MHz
  Multi-Beam Klystron with long RF pulse
• R2.5 Effects of coherent synchrotron radiation
  in bunch compressors
• R2.6 Design of an extraction line for 3 TeV c.m.

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THE CLIC RF POWER SOURCE
Drive Beam Generation Complex
Main Beam Generation Complex
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Drive Beam Accelerator efficient acceleration in
fully loaded linac
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CTF3 MOTIVATIONS AND GOALS

• Build a small-scale version of the CLIC RF power
  source, in order to demonstrate
• full beam loading accelerator operation
• electron beam pulse compression and frequency
  multiplication using RF deflectors
• Provide the 30 GHz RF power to test the CLIC
  accelerating structures and components at and
  beyond the nominal gradient and pulse length (150
  MV/m for 70 ns) .

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RF-to-beam efficiency 94