GADGET*GADGET*
- Motivation
- Work packages
Wigglers
Intra Beam Scattering
Instrumentation Test Beam
Vacuum Systems
-Budget guidelines and status
_______________________________
*Generation And Diagnostics Gear for tiny EmiTtance
ESGARD Open Meeting on FP7-IACERN, 10-11 September, 2007
NAS Integrated Activity
Hans-H. Braun, ESGARD OMNIA meeting, 10.9.2007
Generation of high brightness e- & e+ beams
Accelerate fast & efficient
Preserve brightness up to IP
Key Ingredients for Linear Collider
Generation of high brightness e- & e+ beams
Accelerate fast & efficient
Preserve brightness up to IP
Key Ingredients for Linear Collider
GADGET
3rd generation light source
Equilibriumbeam emittance
Stochastic SR emission
SR cooling from bending magnets
SR insertion devices
Intra beam scattering
Heating Cooling
LCdamping ring
Equilibriumbeam emittance
Stochastic SR emission
SR cooling from bending magnets
SR insertion devices
Intra beam scattering
e+ , small time structurevacuum system
instabilities
Linear collider damping rings are extrapolating technology of SR Light sources
Damping rings and 3rd generation SR facility parameterstable from Yannis Papaphilippou
PARAMETER ILC CLIC ATF ALS SLS
energy [GeV] 5.00 2.424 1.3 1.9 2.4
Bunch charge [109] <20 4.4 10 4 6
circumference [m] 6695.1 365.2 139 197 288
hor. normalized emittance [nm] 5600 395 2798 25656 23483
ver. normalized emittance [nm] 20 4.2 25 19 20
NBXY 105 nm2] 1.78 26.5 1.42 0.082 0.128
Key component to get high brightness are dampings ring Key component to get high brightness are dampings ring
CLIC damping ring CLIC damping ring
• Emittance IBS dominated, 4 x zero current emittance)
• Very strong damping with 2.5 T, W=5cm s.c. wiggler
• Open issues: Wiggler technology, reliability of IBS calculations, e-cloud…
M. Korostelev
SC Wiggler Workpackage
Goals
Demonstrate technical feasibility of wiggler magnets anticipated for CLIC
Explore the technical limits
Get input for LC damping ring design
SC Wiggler workpackage
Partners & Facilities
BINPSC Magnet production and measurement facilities
ANKA2.5 GeV e- storage ring with straight section dedicated for ID R&D
CERN AT-MCSSC cable characterization, coil technology
Only superconducting wiggler magnets with unprecedented parameters can provide sufficient damping strength.
BINP and ANKA have made paper studies for such wigglers,Documented in conference papers at EPAC’06 and PAC’07
Both, BINP and ANKA have an impressive record of achievements with this type of magnet technology
In GADGET we want to design & produce two full size (2m) prototypes of each wiggler type including magnet measurements and tests with beam in ANKA 2.5 GeV SR source.
Goals are
• Demonstrate feasibility of wiggler concepts
• Understand limitations and permissible parameter space for wigglers (therefore two types !)
• Get realistic wiggler description for beam dynamics
BINP ANKA
Bpeak 2.5 T 2.7 T
W 50 mm 21 mm
Beam aperture full height 12 mm 5 mm
Conductor type NbTi NbSn3
Operating temperature 4.2 K 4.2 K
Contour plot of horizontal emittance with IBS as function of wiggler parameters
ANKA SCwiggler
BINP SCwiggler
BINP PMwiggler
Sketches of BINP wiggler
Low vertical beta-optics in the long straight sections of ANKA: βx =14 m, βy = 1.9 m, εx = 40 nm
IBS Workpackage
Goals
Improve Intrabeam scattering theory for reliable predictionof beam performance in unprecedented parameter regime
Validate theory with measurements in existing SR facilities
IBS Workpackage
Partners & Facilities
Cockcroft InstituteDevelopments on IBS theory in Robin Tuckers groupWell equipped theoretical toolbox
ANKAExperiments in ANKA (commitments for beamtime linked with wiggler WP)
CERN (no requests, thesis supervision together with EPFL)
PSI (associated , no requests, thesis supervision together with EPFL)Experiments in SLS
LNF (associated, no requests)Experiments in DANE
IBS workpackage
CLIC DR’s emittance will be dominated by IBS
ILC DR’s emittance has considerable contribution from IBS
Predictive power of existing theory for this regime is more than questionable
• New approaches to compute phase space distribution
• Methods to predict halo generation due to IBS
• IBS and beam polarization
• Ad initio design of magnet lattice for minimum IBS+SR emittance
• Experimental verification of theory with experiments in existing storage rings
See slides of talks at IBS’07 workshop at Cockcroft Institute
2
Single bunch Transverse Emittance
by Laser wire
X emittance determined by Ring Design. Measured data points are fit to simulation.Y emittance =6.5pm at GLC intensity, is below GLC design.
0.8
1.0
1.2
1.4
1.6
1.8
2.0
0 2 109 4 109 6 109 8 109 1 1010
Horizontal Emittancex emittance (run B)x emittance (run D)simulation (0.4% coupling)
x e
mit
tan
ce
[1
0-9]
bunch intensity [electrons/bunch]
GLC Design
2.0
3.0
4.0
5.0
6.0
7.0
8.0
0 2 109 4 109 6 109 8 109 1 1010
Vertical Emittancey emittance (run B)y emittance (run D)simulation (0.4% coupling)
y e
mit
tan
ce
[1
0-12]
bunch intensity [electrons/bunch]
GLC Design
ATF ResultsATF Results
ITB Workpackage
Goals
Provide dedicated facility for beam instrumentation developments
Enable development of novel diagnostic techniques critical for LC’sperformance
Provide an European infrastructure for training opportunities in beam diagnostics
ITB Workpackage
Partners & Facilities
John Adams Instituteworkshops
CERNCTF3
LAPPworkshops and measurement labs
TU Berlinworkshops and measurements labs
Univ. Heidelberg
Univ. Karlsruhe (associated)
CEA-DAPNIACalifes probe beam injector in CTF3
Layout of CLEX-A Layout of CLEX-A (A=Accelerator housing)(A=Accelerator housing) floor space floor space
Dedicated beam line for beam diagnostics R&D using CALIFES beam Dedicated beam line for beam diagnostics R&D using CALIFES beam
Features: low Features: low beam, possibility to achieve very short bunch length, variable time structure, space, accessibility beam, possibility to achieve very short bunch length, variable time structure, space, accessibility
Beamline design and constructionBeamline design and construction JAI, LAPP and CERNJAI, LAPP and CERN
Diagnostics R&D in ITB requested in GADGETDiagnostics R&D in ITB requested in GADGET
Coherent diffraction radiation methodsCoherent diffraction radiation methods JAIJAI
BPM’s for integration in DR-wiggler cryostatBPM’s for integration in DR-wiggler cryostat TU Berlin and LAPPTU Berlin and LAPP
Quantitative halo monitors Quantitative halo monitors Univ. Heidelberg and KarlsruheUniv. Heidelberg and Karlsruhe
Gas jet for “calibration halo”Gas jet for “calibration halo” Univ. Heidelberg and KarlsruheUniv. Heidelberg and Karlsruhe
Single shot emittance measurementsSingle shot emittance measurements CERNCERN
42.5 m
8 m
1.4m
D FFD
DF
F
D F DDUMP
D F D
F
FD
ITB
1.85m
CALIFES probe beam injectorprovided by CEA-DAPNIA
LIL-ACSLIL-ACSLIL-ACSD F D
D F D
DFDUMP
0.75
1.4m
1
DUMP
22.4 m
TBL
2.5m
walk around zone
DUMP
DUMP 23.2 m
1.4 m
DF DF DF DF DF DF DF DF
3.0m3.0m6 m
D F D
F DF D
16.6 m
TBTS
16 m
TL2’
Instrumentation Test Beam Line , ITB in CTF3
CERN contributionions to ITB
Floor space
Technical infrastructure
Magnet and Vacuum power supplies
Control system infratructure
Cabling
Design of High Dynamic Range Beam Profile MonitorsHeidelberg University
Pre studies started at CTF3 in 2003
Novel camera systems >105 dyn. range Able to define regions of interest Fast acquisition
Core masking technique / Micro Mirror Array
- Measure profile- Define halo region- Use mirrors to block (intense)
light from coreC.P. Welsch et al
Proc. SPIE Europe Optical Metrology (2007)
C.P. Welsch et alMeas. Sci. Technol. 17 (2006) 2035c
Experimental Studies on Beam Halo
Gas jet curtain
BeamBeam + Halo
Development of gas jet with highly flexible geometry (intensity and shape), Generation of desired halo distribution, Measurements with high dynamic range monitors, Goal: Benchmarking and improvement of models.
Principle:
Vacuum systems workpackage
Goals
Develop technical solutions for the vacuum system for linear collider damping rings
Get data set for coating as required for reliable prediction of damping ring performance
Vacuum systems workpackage
Partners & Facilities
LNFDANE (e+ beam for e-cloud studies !), vacuum lab.
Cockcroft InstituteVacuum lab
CERN (TS-MME & AT-VAC)Coating facilities, surface physics lab, vacuum lab
ESRFcoating facilities, vacuum lab,SR beamline for photoemission yield measurements
Vacuum systemsVacuum systems
Major worries for DR’s are instabilities due to Ions and e-cloud.Reduction of residual gas pressure and reduction of secondary emissionwith appropriate coatings (NEG, TiN,…) may cure these efffects. This requires a good understanding of a wide range of coating properties and fabrication techniques. There are potential spin-offs with other CLIC and ILCvacuum systems, but also with LHC injector chain.
• LNF Test of vacuum chamber coatings with beam in DANE ring
• Cockcroft Institute Behavior of NEG coatings under conditions close to those expected in damping rings. Measurement of photo-electron yield, photon-stimulated desorption rates, conditioning rates, …. Some data are already available, but need for a set of systematic and rigorous measurements to be able to design a vacuum system with confidence.
• CERN Correlate SEY with surface composition and conditioning Develop new production technique for NEG coated vacuum pipes of small diameter (few mm) Improve capability to simulate vacuum properties in long chambers pumped by NEG films
XPS chamber, 254 mm diam, 70 mm length of CF35 flange320 mm after flangeto be off of XPS table
VACUUM@CERN FOR GADGET
XPS and SEY meas. integratedCoatings and production techniques
1450 CERN made NEG-coated pipes installed in the LHC
e-cloud detectionSPS & PS dedicated benches
10-2
10-1
100
10-3 10-2 10-1 100
10
100
Glo
bal C
aptu
re P
robabili
ty
Sticking Probability
CO
pu
mpin
g sp
eed [ s -1]
M-C simulation
Our experience:- Vacuum in the largest accelerator complex- Production and characterisation facilities already available- Tests benches for ECloud studies already available (SPS & PS)- Commissioning of LHC & Injectors
Where the NEG films were born and grown
P. Chiggiato & J.M. Jimenez
Workpackage Interest Institute Activity TotalTotal /
workpackageEU /
workpackage
ANKA SC-Wiggler 2cm, test installation in ANKA 1368
BINP SC-Wiggler 5cm 800
CERN AT SC-wire and coil technology 200
CERN AB ITB CERN 370
JAI ITB John Adams 1395
LAPP BPM systems 929
JAI CDR experiment 437
Uni. Heidelberg Halo diagnostic developments 300
Uni. Karlsruhe ITB Halo Studies 0
CERN AB single shot emittance measurement 127
TU Berlin Wiggler BPM 321
PSI IBS experiments at SLS/PSI 0
LNF IBS experiments with DAFNE 0
ANKA IBS/wiggler experiment in ANKA 109
Cockcroft IBS theory 327
LNF Ecloud with NEG chamber coating studies in DAΦNE 389
Cockcroft Surface characteristion of NEG coating 1170
CERN TS&AT Small NEG coated chambers, SEY, vac. simulation 815
ESRF tbd
Grand Totals 9057 2801
Ratio commitment/EU request
SC Wiggler
IBS
CLIC
CLIC & ILC
2368
436
2374
3879
2.2
883
988
71
859
Instrumentation Test Beam
CLIC & ILC
Vacuum systems
ILC & CLIC
Present status of GADGET budget estimate all numbers in k€
Budget guidelines from ESGARD (as communicated by Erk Jensen) and present status
Target for GADGET total cost 3.0 M€ + 1.5 M€ (optional) = 4.5 M€
Target for GADGET request to EU 1.0 M€ + 0.5 M€ (optional) = 1.5 M€
Target for commitments / EU request 2.0
Present GADGET total cost 9.0 M€
Present level of EU request 2.8 M€
Present commitments / EU request 2.2
Comments 1st round of systematic accounting of indirect cost boosted EU request from ~2.1 M€ to 2.8 M€ Commitments can be booked elsewhere, but considerable fraction comes from Labs without
direct representation in ESGARD Vacuum systems activity included at request from ILC community after guideline was given Very personal opinion: By creating awareness of existing capabilities & facilities in partner labs
EU requests can probably be reduced to ~2.0-2.4 M€. Further reduction implies abandoning one of the heavy workpackages