Accord Technique No 4, CLIC - G. Geschonke CERN, Geneva, Switzerland White paper CSP 09_07_2009 G.Geschonke, CERN Indico
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Accord Technique No 4, CLIC
G. Geschonke
CERN, Geneva, Switzerland
White paper CSP 09_07_2009 G.Geschonke, 1
CERNThe full CLIC scheme
326 klystrons 326 klystrons
33 MW, 139 µs 33 MW, 139 µs
combiner rings
drive beam accelerator Circumferences
drive beam accelerator
2.38 GeV, 1.0 GHz delay loop 72.4 m 2.38 GeV, 1.0 GHz
CR1 144.8 m
1 km CR2 434.3 m 1 km
delay delay
loop CR2 CR2 loop
CR1 CR1
decelerator, 24 sectors of 876 m
BDS BDS
BC2 2.75 km BC2
2.75 km
245m 245m
km IP
TA e- main linac , 12 GHz, 100 MV/m , 21.02 e+ main linac TA
R=120m R=120m
48.3 km
CLIC 3 TeV booster linac,
9 GeV
BC1
e- injector e+ injector,
2.4 GeV e- e-
e+ e+ 2.4 GeV Not to scale!
PDR DR PDR
DR
365m 365m 365m
365m
White paper CSP 09_07_2009 G.Geschonke, 2
CERNWorld-wide CLIC&CTF3 Collaboration
http://clic-meeting.web.cern.ch/clic-meeting/CTF3_Coordination_Mtg/Table_MoU.htm
32 Institutes involving 21 funding agencies from 17 countries
Ankara University (Turkey) Helsinki Institute of Physics (Finland) JINR (Russia) Patras University (Greece)
Argonne National Lab. (USA) IAP (Russia) Karlsruhre University (Germany) Polytech. University of Catalonia (Spain)
Athens University (Greece) IAP NASU (Ukraine) KEK (Japan) PSI (Switzerland)
BINP (Russia) INFN / LNF (Italy) LAL / Orsay (France) RAL (UK)
CERN Instituto Fisica Corpuscular (Spain) LAPP / ESIA (France) RRCAT / Indore (India)
CIEMAT (Spain) IRFU / Saclay (France) NCP (Pakistan) SLAC (USA)
Cockcroft Institute (UK) Jefferson Lab (USA) White paper CSP 09_07_2009 G.Geschonke,
North-West. Univ. Illinois (USA) 3
Thrace University (Greece)
Gazi Universities (Turkey) John Adams Institute (UK) CERN
Oslo University (Norway) Uppsala University (Sweden)Tentative long-term CLIC scenario
Shortest, Success Oriented, Technically Limited Schedule
Technology evaluation and Physics assessment based on LHC results
for a possible decision on Linear Collider with staged construction
starting with the lowest energy required by Physics
2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
R&D on Feasibility Issues
Conceptual Design
R&D on Performance and Cost issues
Technical design
Engineering Optimisation&Industrialisation
Construction (in stages)
Construction Detector
Conceptual Technical Project First
Design Design
approval ? Beam?
Report Report
(CDR) (TDR)
White paper CSP 09_07_2009 4
G.Geschonke, CERNCLIC critical items
SYSTEMS Critical parameters
100 MV/m
Main Beam Acceleration Structures:
240 ns
Demonstrate nominal CLIC structures with damping features at the design
< 3·10-7 BR/(pulse*m)
Structures
gradient, with design pulse length and breakdown rate .
RF to Beam efficiency > 30%?
136 MW, 240 ns
RF Power production structures:
< 10-7 BR/(pulse*m)?
Demonstrate nominal PETS with damping features at the design power,
Beam to RF efficiency >?
with design pulse length, breakdown rate and on/off capability
On/Off < 20 ms
Two Beam
Two Beam Acceleration (TBA): Two Beam Acceleration with simultaneous &
Demonstrate RF power production and Beam acceleration with both beams nominal parameters as quoted above for
in at least one Two Beam Module equipped with all equipments individual components
Drive Beam Production 100 Amp peak current
- Beam generation and combination 12GHz bunch repetition frequency
Drive Beam
- phase and energy matching 0.2 degrees phase stability at 12 GHz
- Potential feedbacks Feasibility Items 7.5 10-4 intensity stability
RF power generation by Drive Beam
90% extraction efficiency
- Rf power extration
Large momentum spread
- Beam stability
Physics
Beam
Generation and Preservation of Low Emittances Emittances(nm): H= 600, V=5
Damping Rings, RTML and Main Linacs Absolute blow-up(nm): H=160, V=15
Main Linac : 1 nm vert. above 1 Hz;
Stabili
zation
Main Linac and BDS Stabilization BDS: 0.15 to 1 nm above 4 Hz depending on
final doublet girder implementation
Operation and Machine Protection
Operation
reliability
Staging of commissioning and construction drive beam power of 72 MW @ 2.4 GeV
and
MTBF, MTTR main beam power of 13 MW @ 1.5 TeV
Machine protection with high beam power
Detector
Beam-Beam Background
Detector design and shielding compatible with breakdown generated by 3.8 108 coherent pairs
White paper
beam beam effects during collisions CSP
at high 09_07_2009 G.Geschonke, CERN
energy 54.1 Participation in beam studies and
beam instrumentation for CALIFES and TBTS
4.1 Work-package title Participation in
Work-package number beam studies and
beam
instrumentation
for CALIFES and
TBTS
Reference CEA Wilfrid Farabolini, Roberto Corsini
institute
Time span Start End
October 2008 September 2010
Allocated human resources 12 man.months Allocated 0 K€
financial
resources
Indicative personnel profile Indicative committment profile
Engineer Technician Draft man K KCHF
€
2008 1.5 2008
2009 6 2009
2010 4.5 2010
2011 2011
Total 12 Total
Milestones and Deliverables
Date Description
October 2008 Participation to CALIFES commissioning
September 2010 Participation to consolidation and two-beam studies
Detail description
Provide (half of the the time) for one engineer, based at CERN, from mid 2008 to mid 2010.
The remaining time is covered by IRFU
He will participate in beam activities (during CTF3 operation periods) and to their preparation
(during shut-down), aimed at commissioning the CALIFES probe beam linac to full specifications and at
exploitation of the probe beam in the Two-Beam Test Stand (TBTS).
He will be involved in:
• Reaching and quantify full beam specifications in CALIFES
• Fully exploit installed beam diagnostics (cavity BPMs and bunch length monitoring)
• Providing stable probe beam with good availability for two-beam studies
• Preparing and executing beam studies involving both drive beam and probe beam (e.g. in TBTS) On schedule as planned. Wilfrid Farabolini
is permanently at CERN. Excellent collaboration
White paper CSP 09_07_2009 G.Geschonke, CERN 6Klystron and BOC
Califes
Photo Injector
waveguide RF distribution
Accelerating sections RF deflector for diagnostics
7 G.Geschonke, CERN
White paper CSP 09_07_20094.2. Participation to CLIC Module
Reference CEA (FR) G.Riddone, Franck Peauger (ad interim)
institute
Time span Start End DB
Nov 2008 Dec 2011
Allocated human 6 man.months Allocated 249 K€
resources financial
resources
Indicative personnel profile Indicative committment profile
Engineer Technician Draft man K€ KCHF
2008 1 2008
2009 1 0.5 2009 49
2010 1.5 0.5 2010 200
2011 1.5 2011
Total 5 1 Total 249
Milestones and Deliverables
Date Description
Dec-2008 Kick-off meeting
Mar-2009 WFM design review: MB
Jun-2009 WFM delivery (prototype)
Sep-2009 Complete ACS final design review
Jun-2010 Complete ACS delivery
Detail description
This workpackage covers the design and the procurement of accelerating structures with
wakefield monitors for the CLIC test module.
The 2-m long CLIC module will contain up to 4 PETS feeding each 2 accelerating structures.
The drive beam module will also be equipped with two quadrupoles and the main beam module
with one quadrupole, whose length varies from 0.5 to 2 m. One of the key issues to demonstrate
the CLIC feasibility is the acceleration gradient of the accelerating structures. In this context their
precise alignment has to be studied and developed. One way to release the pre-alignment
tolerances is to use the beam to obtain the information on the accelerating structure position. The
position of the beam can be achieved by using wakefield monitors, which will be directly
integrated in the accelerating structures.
The CLEX testing program foresees the test of power generation (phase 1) and two beam scheme
(phase 2) by using the two-beam test module. Already in this phase 2, as the main beam will be Wakefield monitor studies
equipped with one to several accelerating structures, it is foreseen to integrate the first wakefield
monitor prototype to an existing testing structure.
The two-beam test module will be then followed by the CLIC test module aiming, as much as
have started
possible, to reproduce the CLIC module. The main objective of the first phase will be the testing
of the accelerating structure alignment and the validation of the wakefield monitor performance.
For this phase, it is foreseen to build three complete accelerating structures with integrated
wakefield monitor.
White paper CSP 09_07_2009 G.Geschonke, CERN 8Phase 2 of the two beam test stand:
- review of the WFM design will occurr on 22 July 2009 in the framework of the CLIC
module working group. A progress meeting was already held in April 2009.
The WFM procurement is expected by end of this year (about 20-25kEUR)
Phase 3 of the two beam test stand
- technical specification for the structure production: the technical specification for the
prototype qualification disks has beenn prepared and the call for tender ready to be
launched. Six-seven firms will be contacted. The contract for the prototype will be
adudicated in September 2009 (about 20 kEUR). Considering the time needed for the
prototype phase, the contract for the series (3 structures) will be adjudicated only in the
year 2010.
White paper CSP 09_07_2009 G.Geschonke, CERN 9Wakefield monitors studies
sigma z = 3mm , off axis beam dy=-1mm
Probes: Transverse
field Ex and Ey
Transverse mode at 22 GHz
Transverse E field in damped waveguide with beam sigz=3mm Transverse E field spectrum in damped waveguide with beam
and offset dy=-1mm sigz=3mm and offset dy=-1mm
Ex at (0;-38)
100000 Ey at (38;0) 1.E+07
10000 1.E+06
1000 1.E+05
20 dB 25 dB
E (V/m)
100
1.E+04
E (V/m )
10
1.E+03
1
1.E+02 Ex at (0;-38)
0.1 Ey at (38;0)
1.E+01
0.01
1.E+00
0 1 2 3 4 5 6
10 15 20 25 30 35
t (ns)
t (ns)
Courtesy of Franck Peauger
White paper CSP 09_07_2009 G.Geschonke, CERN 10Status CLEX (CLIC Experimental Area)
existing building
F D F D F D F D F D F D F D F D F D DF DF
F
D
F
DFD DFD FD FD
Beam from CR/TL2
DF D DF D D F D
F
D
F
Test Beam Line TBL
Two Beam Test Stand Probe Beam
All Beam lines installed, except TBL and operated with beam !
(ITB is not part of the base-line programme)
11 G.Geschonke, CERN
White paper CSP 09_07_2009Test Beam Line TBL
TBL
• High energy-spread beam
1
6m 22.4 m 3.0m 3.0m
DUMP F D F D F D F D F D F D F D F D F D
DF DF
F
1.85m
D P
TL2’
F DUM
DUMP
DFD DFD FD FD
2
transport
0.75
DFD D F D m
8m
D FD LIL-ACS LIL-ACS LIL-ACS
P
16.5 m D UM F 22 m
TBTS CALIFES Probe beam injector
2.5m
D
2.0m F
DUMP
16 m
ITB
Transport path
1.4m decelerate to 50 % beam energy
42.5 m • Drive Beam stability
• Stability of RF power extraction
PETS prototype
total power in 16 PETS: 2.5 GW
• Alignment procedures
5 MV/m deceleration (35 A)
165 MV output Power PETS development: CIEMAT
BPM: IFIC Valencia
2 standard cells, 16 total White paper CSP 09_07_2009 G.Geschonke, CERN and UPC Barcelona 124.3 12 GHz RF network for 8 PETS in TBL
Reference CEA Steffen Doebert, Igor Syratchev, Franck Peauger
institute There was a review of the CEA proposal for this
Time span Start End
October 2008 March 2009 components foreseen for June 2009. This review
Allocated human 5 man.months Allocated 218 K€
resources financial
resources has not happened yet.
Indicative personnel profile Indicative committment profile
Engineer Technician Draft man K€ KCHF
2008 1 2008
2009
2010
1
1
2 2009
2010
118
100
The status is as follows:
2011 2011
Total 3 2 Total Franck got drawings for high power loads (Igor
Milestones and Deliverables
Date Description style) and directional couplers (SLAC style) which
November 2008 Participation in 12 GHz component review at CERN
June 2009 Review of a proposal by CEA for the realization of the work
package
he wanted to modify if needed and discuss with
October 2009 Evaluation of prototypes
October 2009- March Delivery of all rf components, October 4 loads and 2 directional companies. Lately he was asked to incorporate an rf
2010 couplers
Detail description pick up into the load to save the couplers and have
This work-package covers the purchase and delivery of 12 GHz rf components for 8 PETS in only one item to make.
TBL.
Depending on high power test results, fabrication costs and fabrication delay, a list of RF He started working on that but there is not a final
components to supply will be established.
The objective is to provide the following components needed for 8 PETS module in TBL. result yet.
Components needed: 16 RF power loads
8 directional couplers
16 WR90 waveguide bends 90 deg (H-bend)
All components have to fulfill the high-power and vacuum specification provided by CERN. Steffen Doebert
White paper CSP 09_07_2009 G.Geschonke, CERN 1312 GHz Test-
Test-Stand
at CERN
KM Schirm BE-RF14Schedule
ID
2009 2010
1st Quarter 2nd Quarter 3rd Quarter 4th Quarter 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter
Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep Oct
1 Klystron Supply
G. McMonagle
2 Modulator
Saclay,G. McMonagle
3 Pulse Compressor (GYCOM)
Karl-Martin Schirm[50%],Igor Syratchev[50%]
4 Low-level RF
J. Mourier,Luca Timeo
5 RF components
G. Riddone; S. Doebert; K. Schirm,Saclay
6 Controls
M. Draper;S.Doebert
7 Test-Stand
G. Riddone; S. Doebert; K. Schirm
8 Infrastructure
J. Monteiro; K. Schirm,G. McMonagle
9 System commissioning
??
KM Schirm BE-RF 154.4.Construction of a 12 GHz Test Stand: Modulator
Reference CEA G.McMonagle, Franck Peauger
institute
Time span Start End
October 2008 June 2010
Allocated human 12 man.months Allocated 398 K€
resources financial
resources
Indicative personnel profile Indicative committment profile
Engineer Technician Draft man K€ KCHF
2008 1.2 2008
2009 3.6 2009 398 639.3
2010 3.6 3.6 2010
2011 2011
Total 8.4 3.6 Total
Deliverables and Milestones
Date Description
January 2009 Participation in the klystron design review at SLAC
January 2009 Tender for modulator purchase
March 2009 Choice of the supplier in collaboration with CERN
May 2009- Modulator production follow-up
April-May 2010 Delivery of the modulator to CERN, installation and high power
The supplier is chosen and is Scandinova (new technology
tests with a SLAC klystron
Detail description with solid state switchs, short delivery time of 10 months,
This work-package covers the procurement, installation and tests of a modulator for the 12 GHz Test
Stand. This modulator will be integrated in the CTF3 klystron gallery to drive an X-band klystron from resonable price and synergy with PSI)
SLAC.
The work-package includes the following:
Ø Call for tenders according to CERN technical specifications
Ø Industrial follow-up of the purchase The order has been accepted by head of Irfu. The contract
Ø Follow-up of the installation and tests at CERN
Ø Participation in the design study of the interfaces with the Low Level RF system and the SLAC has been signed by Scandinova without modification last
klystron
week and is under signature at CEA Saclay.
The kick off meeting will be done 1st of July)at Uppsala
with Scandinova and CEA Saclay.
White paper CSP 09_07_2009 G.Geschonke, CERN 164.5. Construction of a 12 GHz Test Stand: Pulse compressor
Reference
institute
CEA Karl Schirm, Franck Peauger
ordered from Gycom
Time span Start End
October 2008 June 2010
Allocated human 12 man.months Allocated 156 K€
resources financial
resources
Indicative personnel profile Indicative committment profile
Engineer Technician Draft man K€ KCHF
2008 1.2 2008
2009 3.6 3.6 2009 56
2010 3.6 2010 100
2011 2011
Total 8.4 3.6 Total
Deliverables and Milestones
Date Description
May 2009 Preliminary Design Review : decision between SLED1, SLED2 and
BOC
choice of supplier
May 2010 Delivery of the Pulse Compressor to CERN, installation and high
power tests with a SLAC klystron
Detail description
This work-package covers the design, fabrication and installation of a 12 GHz Pulse Compressor. This
Pulse Compressor will be integrated in the CTF3 buildings at CERN. Three technical solutions are under
considerations: SLED1, SLED2 or BOC type pulse compressor
For the SLED1 option, an offer has been submitted by a Russian company. In case this solution is retained
CERN would order this product ready to use, and the contribution would be re-allocated in either 4.4. or The pulse compressor activity at CEA is more or less in
4.6.
For the SLED2 option, the work-package includes the following: standby because of the order of the GYCOM SLED1 pulse
Ø Design study to produce a full set of fabrication drawings and related technical specifications
Ø Commercial documentation needed for the call for tender compressor by CERN. We have nevertheless started the RF
Ø Industrial follow-up of the manufacture of the components: Delay line Ø 90 mm, 42 meters long,
vacuum pumping ports, ion pumps, baking system design of a 12GHz BOC. We could continue if needed.
Ø Participation in the installation of the SLED2 at CERN
For the BOC option, the work-package includes the following: F.Peauger
Ø Design study to produce a full set of fabrication drawings and related technical specifications
Ø Commercial documentation needed in the call for tender
Ø Industrial follow-up of the manufacture of the whole system
Ø Participation in the installation of the BOC at CERN possibly reallocate funds later
White paper CSP 09_07_2009 G.Geschonke, CERN 174.6.Construction of a 12 GHz Test Stand:
RF network and components
Referenc CEA Igor Syratchev, Franck Peauger
e
institute
Time Start End
span October 2008 June 2010
Allocated human 1 man.months Allocated 50 K€
resources financial
resources
Indicative personnel profile Indicative
committment profile
Enginee Technicia Draft K KCHF
r n man €
2008 2008
2009 1 2009 50
2010 2010
2011 2011
Total 1 Total For the RF network activity, we have finished the RF
Deliverables and Milestones
Date Description design of the RF valve . It will replace RF windows to
December 2008 Participation in 12 GHz component review at CERN
divide vacuum sectors in the RF network, in order to
February - June High-power testing at CERN change quickly the structure under test for example. The
2010
mechanical design is almost done by N. Chritin and we
Detail description
have to organize the fabrication.
This work-package covers review, testing, purchase and high-power
commissioning of RF components. Several options and suppliers are under We also plan to scale the SLAC mode launchers
evaluation. The share of activities and the commercial part will be decided after a (rectangular to circular mode conversion). We have asked
decision about the pulse compression system 4.5. in May 2009.
drawings to SLAC recently in order to start the HFSS
calculations. F.Peauger
Layout and RF network under design at CERN
White paper CSP 09_07_2009 G.Geschonke, CERN 184.7. Participation à la stabilisation des éléments
optiques: Instrumentation spécifique (dynamique)
Reference CNRS/ LAPP Claude Hauviller (CERN) and Andrea Jeremie (LAPP)
institute
Time span Start End
Allocated human
2008
36 man.months
2011
Allocated 74 K€
Qualification du démonstrateur pour la
resources financial
resources stabilisation du Linac :
Indicative personnel profile Indicative committment profile (a
reviser) - les calculs vibratoires de l'aimant du
Engineer Technician Draft man K€ KCHF
2008 0 0 0 2008 0 démonstrateur ont ete effectues et le rapport
2009 15 2009 32
2010
2011
15
6
2010
2011
32
10
(Milestone 1) est en cours de redaction.
Total 36 Total 74
Milestones and Deliverables
- la construction d'un démonstrateur simplifié
Date Description
4/2009 Milestone 1 : Calculs vibratoires de l’aimant du démonstrateur (version LAPP) a commence (usinage d'un pole
(rapport)
12/2009 Milestone 2: Construction et qualification d’un démonstrateur d'aimant en aluminium realise).
simplifié (version LAPP) et du(es) prototype(s) de contrôle servant
a ce démonstrateur (rapport)
3/2010 Milestone 3 : Analyses vibratoires de l’ensemble du démonstrateur
(rapport)
6/2010 Milestone 4 : Développement de la méthodologie de contrôle et Claude Hauviller
application au démonstrateur (plusieurs combinaisons)
10/2010 Milestone 5 : Rebouclage des calculs vibratoires avec les mesures
sur le démonstrateur (rapport)
3/2011 Milestone 6 : Evaluation des performances (Rapport)
Detail description
Participer à la réalisation mécanique et à la qualification du démonstrateur pour la
stabilisation du Linac : en particulier, calculs vibratoires avec analyses initiales et bouclage
après mesures.
Développer la méthodologie de contrôle pour stabiliser des structures avec plusieurs degrés de
liberté. Appliquer ces logiciels aux différentes combinaisons de capteurs/actionneurs installées
sur le démonstrateur et en améliorer les performances. Rechercher une solution commerciale ou
développer le système d'acquisition temps réel.
White paper CSP 09_07_2009 G.Geschonke, CERN 194.8. Participation à la stabilisation des éléments
optiques: Instrumentation spécifique (optique)
Reference CEA/IRFU Claude Hauviller (CERN) and Florence Ardellier-
institute Desages (IRFU)
Time span Start
2009
End
2011
Etude de méthodes de mesure optique
Allocated human 12 man.months Allocated 50 K€
resources financial indépendantes de celle utilisée dans la boucle
resources
Indicative personnel profile Indicative committment profile d'asservissement avec application au
Engineer Technician Draft man K€ KCHF
2008 2008 démonstrateur.
2009 2 2 2009 30
2010 2 2 2010 10
2011 2 2 2011 10
La première étape consiste en la qualification d'un
Total 6 6 Total 50
Milestones and Deliverables banc de mesure.
Date Description
10/2009 Résultats des mesures croisées avec interféromètre (rapport) Le choix d'un interféromètre différentiel est
12/2009 Intégration du système de mesure interférométrique dans le
démonstrateur actuellement a l'etude: consultation en liaison avec
10/2010 Mesure des mouvements d’un point sur un pôle de l’aimant
(rapport)
3/2011 Mesure sur n points correspondant aux pôles de l’aimant (rapport)
le CERN des fournisseurs potentiels et
Detail description
Etude de méthodes de mesure optique indépendantes de celle utilisée dans la boucle comparaison des performances de leur produit.
d’asservissement avec application au démonstrateur.
Première étape : Qualification d’un banc de mesure Des equipements en pret vont etre testes et
04/2009 à 10/2009 : Acquisition et mise en exploitation d’un interféromètre
différentiel pour effectuer et qualifier des mesures croisées sur l’équipement
qualifies sur un set-up simplifie.
(modèle), le support et le sol (mesures faites à Saclay par le SIS).
Deuxième étape : Comparaison des mesures avec les autres moyens (géophones,
accéléromètres…)
01/2009 à 12/2009 : Ces études comparatives seront menées sur les
Claude Hauviller
équipements du CERN, par le CERN et avec la participation du SIS en exploitant
les résultats de la mesure optique.
Troisième étape : Mesures sur maquette (démonstrateur)
01/2010 à 12/2010 : Les études à mener seront les suivantes :
• Mesure des mouvements d’un point sur un pôle de l’aimant (10/2010)
• Définition d’un schéma de principe du système de mesure final
• Définition des références mécaniques, relatives et absolues
• Mesure sur n points : 2 x 4 correspondant aux pôles sur la maquette
White paper CSP 09_07_2009 G.Geschonke, CERN 204.9. CLIC positron sources
Reference CERN Louis Rinolfi (CERN), Alessandro Variola (LAL)
institute
Time span Start End
1 October 2008 1 October 2010
Allocated human resources 24 man.months Allocated 0 K€
financial
resources
Indicative personnel profile Indicative committment profile
Engineer Technician Draft man K KCHF
€
2008 3 0 0 2008
2009 12 0 0 2009
2010 9 0 0 2010
2011
Total 24
2011
Total
The two first deliverables foreseen for May 2009 have
Milestones and Deliverables
May 2009
Date Description
Optimization study and detailed characteristics of the hybrid targets and the been produced. A draft CLIC Note has been written and
corresponding geometry
May 2009 Provides the Peak Energy Deposition Density (PEDD) for each target and the
heating consequences will be published soon.
December 2009 Detailed beam characteristics at the end of the e+ Pre-Injector Linac (Base Line
configuration)
December 2009 Compton Scheme: Detailed laser characteristics corresponding to the proposed Geant 4 simulations have been performed for different
stacking cavity
September 2009 Compton Scheme: Characteristics of the photons flux with the corresponding
geometry primary beam energies, different target thickness and
November 2009 Compton Scheme: Detailed characteristics of the e+ target(s)
March 2010 Compton Scheme: Provides the PEDD and parameters related to thermal effects
different distances between crystal and amorphous targets.
March 2010 Compton Scheme: Simulations optimized showing detailed beam characteristics
of the e+ Pre-Injector Linac (at 200 MeV)
October 2010 Compton Scheme : study on how to rescale the parameters for CLIC and
needed R&D. : Eventual results of experimental tests at ATF for the optical
We are now in position to elaborate and define a best
cavity and the laser
Detail description configuration for the CLIC e+ source based on hybrid
The CLIC Injector Complex will provide electrons and positrons.
In the Base Line design, the e+ are unpolarized and are produced by channeling
targets.
from hybrid targets (crystal+amorphous). For the production of polarized positrons,
the preferred option is based on the Compton scheme. An alternative option is the It will be a trade off between the primary beam energy
undulator scheme which is studied for ILC as base line.
The design studies for the Base Line configuration will be focused on hybrid targets
(cost issue), the e+ yield (performance issue) and the
and the captured and pre-acceleration of e+. The hybrid target is a solution
proposed by LAL, in association with IPNL and BINP-Novosibirsk, where a crystal power dissipation inside the target (reliability issue).
plays the role of channeling photon source and the produced gammas are converted
subsequently in pairs e+ - e- in an amorphous target. The low energy particles,
responsible for the target heating, are extracted before the amorphous target.
The design studies for the Compton scheme will be focused on the collision scheme,
L.Rinolfi
the optical cavity, the laser system, the conversion system and the
capture/acceleration process.
LAL is already engaged in a program of high power lasers and high gain Fabry Perot
cavities. Some first results are expected for the end of 2009-2010. The experimental
test program at ATF is running for 3 years and LAL will continue it in collaboration
with KEK people. CERN will follow the results of the experiments. According to the
results, LAL will propose a parameters rescaling for CLIC.
White paper CSP 09_07_2009 G.Geschonke, CERN 21You can also read
