Transcript Pergine Slides - Istituto Nazionale di Fisica Nucleare

Measurements, ideas, curiosities
the straight path to high-energy physics…
Complement to the presentation on Linear Colliders: ILC and CLIC
F. Ruggiero
CERN
Univ. “La Sapienza”, Rome, 20–24 March 2006
Linear Collider parameters
(from the ILC-TRC/Second Report 2003)
F. Ruggiero
CERN
Linear Colliders: ILC and CLIC
The technology choice
SC vs NC projects in 1994: s =500 GeV
TESLA SBLC
f
JLC-S
JLC-C
JLC-X
NLC
VLEPP
CLIC
1.3
3.0
2.8
5.7
11.4
11.4
14.0
30.0
6
4
4
9
5
7
9
1-5
Pbeam
16.5
7.3
1.3
4.3
3.2
4.2
2.4
~1-4
PAC
164
139
118
209
114
103
57
100
gey
[10-8m]
100
50
4.8
4.8
4.8
5
7.5
15
64
28
3
3
3
3.2
4
7.4
[GHz]
L1033
[cm-2s-1]
[MW]
[MW]
s y*
[nm]
F. Ruggiero
CERN
Linear Colliders – ILC and CLIC
The technology choice
SC vs NC projects in 2003: s =500 GeV
TESLA SBLC
JLC-C
JLC-X/NLC
1.3
5.7
11.4
30.0
34
14
20
21
Pbeam
11.3
5.8
6.9
4.9
PAC
140
233
195
175
gey
[10-8m]
3
4
4
1
s y*
[nm]
5
4
3
1.2
f
[GHz]
L1033
[cm-2s-1]
[MW]
[MW]
F. Ruggiero
JLC-S
CERN
VLEPP
Linear Colliders – ILC and CLIC
CLIC
R&D on Multi-TeV Linear Collider
R. Corsini – HEP05 22/7/05
CLIC
BASIC FEATURES OF CLIC
• High acceleration gradient (150 MV/m)
• “Compact” collider - overall length  40 km
• Normal conducting accelerating structures
• High acceleration frequency (30 GHz)
• Two-Beam Acceleration Scheme
• Capable to reach high frequency
• Cost-effective & efficient (~ 10% overall)
• Simple tunnel, no active elements
OVERALL LAYOUT OF CLIC
FOR A CENTER-OF-MASS ENERGY OF 3 TeV
• Central injector complex
• “Modular” design, can be built in stages
R&D on Multi-TeV Linear Collider
R. Corsini – HEP05 22/7/05
CLIC
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
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
Δtb
0.267 (8 periods)
ns
Bunch train length
τtrain
58.4
ns
Beam power / beam
Pb
20.4
MW
Luminosity (in 1% of energy)
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
ηtot
12.5
%
R&D on Multi-TeV Linear Collider
R. Corsini – HEP05 22/7/05
CLIC
THE CLIC TECHNOLOGY-RELATED KEY ISSUES
AS POINTED OUT BY ILC-TRC 2003
Covered by CTF3
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.
Covered by EUROTeV
* Feasibility study done – need development by industry.
N.B.: Drive beam acc. structure parameters can be adapted to other klystron power levels
R&D on Multi-TeV Linear Collider
CLIC
R. Corsini – HEP05 22/7/05
THE CLIC RF POWER SOURCE
Drive Beam
Generation
Complex
Main Beam
Generation
Complex
R&D on Multi-TeV Linear Collider
R. Corsini – HEP05 22/7/05
CLIC
Delay Loop  2
Drive Beam Accelerator
gap creation, pulse
compression & frequency
multiplication
efficient acceleration in fully loaded linac
RF Transverse
Deflectors
Combiner Ring  4
pulse compression &
frequency multiplication
Combiner Ring  4
pulse compression &
frequency multiplication
CLIC RF POWER SOURCE LAYOUT
Drive Beam Decelerator Section (2

21 in total)
Power Extraction
Drive beam time structure - initial
70 ns
100 ms train length - 32  21  2 sub-pulses - 5.7 A
2.5 GeV - 64 cm between bunches
Drive beam time structure - final
70 ns
4.5 ms
2  21 pulses – 180 A - 2 cm between bunches
R&D on Multi-TeV Linear Collider
CLIC
R. Corsini – HEP05 22/7/05
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) .
Drive Beam
Injector
Drive Beam Accelerator
16 structures - 3 GHz - 7 MV/m
3.5 A - 1.4 ms
150 MeV
X 2 Delay Loop
X 5
Combiner
Ring
Two-beam
150 MV/m
Test Area
Main Beam
Injector
35 A - 140 ns
150 MeV
RF DEFLECTORS
HIGH POWER 30 GHz
TEST STANDS
R&D on Multi-TeV Linear Collider
R. Corsini – HEP05 22/7/05
CLIC
FIRST “FULL” BEAM LOADING OPERATION IN CTF3
Dipole modes suppressed by slotted iris
damping (first dipole’s Q factor < 20)
and HOM frequency detuning
Damping
slot
RF signals / output coupler of structure
beam off
30 MW
SiC load
1.5 ms
RF power
0.4 MW
beam on
Beam current
Beam pulse lenght
Power input/structure
Ohmic losses (beam on)
RF power to load (beam on)
4A
1.5 ms
35 MW
1.6 MW
0.4 MW
RF-to-beam efficiency
~ 94%