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UK ILC-Related R&D. G. A. Blair Royal Holloway Univ. London EGDE Meeting, Oxford 25 th October 2005. LC-ABD Programme Overview of the projects Future prospects. UK funding for accelerator science for particle physics 2004 - 2007. - PowerPoint PPT Presentation
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UK ILC-Related R&D
G. A. Blair
Royal Holloway Univ. London
EGDE Meeting, Oxford
25th October 2005
• LC-ABD Programme• Overview of the projects• Future prospects
EGDE, Oxford, Oct05 G. Blair, RHUL 2
UK funding for accelerator science for particle physics 2004 - 2007
UK funding agency, PPARC, secured from Govt. £11M for ‘accelerator science’ for particle physics, spend period April 04 – March 07
Bids peer-reviewed and preliminary new allocations made Oct 21 2003:
ILC-Beam Delivery £7.2M from PPARC +
£1.5M from CCLRC
2 university-based accelerator institutes
EGDE, Oxford, Oct05 G. Blair, RHUL 3
Accelerator Institutes
2 New institutes for Accelerator science:
Cockcroft: Lancaster, Liverpool, Manchester
- based at DL campus.
12 New academic positions.
John Adams Institute: Oxford, RHUL:
- based at both institutes
6 new academic positions.
EGDE, Oxford, Oct05 G. Blair, RHUL 4
CCLRC New14%
PPARC New69%
PPARC Displacement
17%
Financial Summary UK LC-ABD
EGDE, Oxford, Oct05 G. Blair, RHUL 5
ILC: LC-ABD Collaboration
• Bristol • Birmingham • Cambridge • Dundee• Durham • Lancaster• Liverpool • Manchester • Oxford • Queen Mary, Univ. London• Royal Holloway, Univ. Of London• University College, London • Daresbury and Rutherford-Appleton Labs;
41 post-doctoral physicists (faculty, staff, research associates) + technical staff + graduate students
EGDE, Oxford, Oct05 G. Blair, RHUL 6
Lattice design + Simulation8%
Beam Transport + Backgrounds
9%
Laser-wire15%
Longitudinal Profile7%
Polarisation1%
LiCAS15%
FONT+ BPM Spectrometry17%
Polarised Positron Undulator
8%
Crab Cavity13%
Collimation5%
Training+ General2%
Overview of Projects
EGDE, Oxford, Oct05 G. Blair, RHUL 7
UK LC-ABD Work Packages
1. Lattice design and beam simulations (D. Angal-Kalinin)
2. Advanced beam diagnostics (G. Blair)
3. Alignment and survey (A. Reichold)
4. Final focus luminosity stabilisation and spectrometry (P. Burrows)
5. e+ undulator, crab cavity system, wakefields/collimators (M. Poole)
O. Napoly (Saclay) M. Ross (SLAC) D. Schulte (CERN) M. Tigner ( Cornell; Chair) J. Urakawa (KEK) N. Walker (DESY; representative of PPARC OSC) K. Yokoya (KEK)
The Panel met for the first time yesterday (24th October 2005) and have provided feedback on our current programme and will provide input to our future plans.
LC-ABD Review Panel
Form a strong optics team within the UK to be able to provide the necessary input to other LC-ABD work packages
Understand the ILC BDS designs Set up all the necessary optics and tracking codes for the
optics design. Contribute to the ILC lattice design and layout with
international collaborators Provide the input decks of the evolving lattices to other work
packages Contribute to the optics design for the test facilities for the
ILC and participate in the beam tests
WP1.1 Machine Optics (D. Angal-Kalinin)
EGDE, Oxford, Oct05 G. Blair, RHUL10
Final Focus and extraction line optimized simultaneously Quadrupoles and sextupoles in the FD optimized to
cancel FF chromaticity focus the extracted beam
SLAC-BNL-UK-France Task Group
QF1
pocket coil quad : C. Spencer
O.Napoly, 1997
2 mrad Optics Design
EGDE, Oxford, Oct05 G. Blair, RHUL11
Optics for beam diagnostics
Optics design to achieve 1m y in ATF extraction line
Participate in LW runs with WP2.1 to verify the optics
Study proposed coupling correction and emittance diagnostics section for the ILC Beam sizes for laser wire increase in length of section? Requirements of generic beam diagnostics for ILC BDS Accuracies and resolutions for these devices Optimise the BDS lattice including beam diagnostics
LW
• Design www-accessible code management/archive facility.
• Improve ground-motion models and develop models of facilities noise.
• Generate benchmark beam-beam interaction results for different ground-motion models, parameter sets, and machine designs; store results in database.
• Develop BDSIM into a user-friendly package with improved documentation and code-management that is used widely in UK BDS studies.
• Develop simulation of beam halo, and its production.
• Develop expertise in the design of the beam diagnostics section (modeling realistic backgrounds to find optimal placement of laser-wire system).
• Study backgrounds generated in the ILC IR and the effect on the performance of the IP fast-feedback system.
• Study alignment and tuning strategies for the ATF2 extraction line and for the ILC BDS.
• Numerical wakefield and collimation studies.
• Background tracking simulations for ESA FONT BPM tests.
• Simulations of ILC IP beam parameter reconstruction using event shape analysis from beamstrahlung hitting forward calorimeters.
WP1.2 Simulations (J. Jones, G. White)
EGDE, Oxford, Oct05 G. Blair, RHUL 13
Multi-Seed Luminosity Studies with the ILC Simulation Model
1.5 1.55 1.6 1.65 1.7 1.75 1.8 1.850
5
10
15
20
25
Luminosity / cm-2 s-1 1034
= 1.6747 0.067286
2.7 2.75 2.8 2.85 2.9 2.95 3 3.050
2
4
6
8
10
12
14
16
18
Luminosity / cm-2 s-1 1034
= 2.8788 0.075445
350 GeV CME
500 GeV CME
0 100 200 300 400 500 6000
1
2
3x 10
34
Bunch #
Lu
min
os
ity
/ c
m-2
s-1
ANG + IP Fast Feedback
LUMI Feedback Optimisation (Position +
Angle)
EGDE, Oxford, Oct05 G. Blair, RHUL 14
BDSIMBeamlines are builtof modular accelerator components
Full simulationof em showers
All secondariestracked
Screenshot of an IR Design in BDSIM
• Extract full returns from the investment made in the PETRA + ATF laser-wires, develop new hardware and techniques there and gain experience with a fast-scanning system.
• RAs and students to work with the ATF and PETRA accelerator physicists in machine studies and in devising new optics schemes to minimise the beam spot-size at the laser-wire position.
• Develop a strong UK laser facility from which to develop a mode-locked laser system for the laser-wire and use it to expand into a wider range of laser-based beam diagnostics.
• Produce a performance study of the operation of laser-wires and other laser-based beam diagnostics in a realistic BDS, using full simulations and realistic background levels.
WP2.1 – Laser-wire (G. Blair)
EGDE, Oxford, Oct05 G. Blair, RHUL 16
Laserwire - PETRA+ UCL
11.2.05
New EUROTeV Laser arrived at DESY in October 2005
EGDE, Oxford, Oct05 G. Blair, RHUL 17
ATF-LW Vacuum Chamber
Built atOxfordDO +Workshop
VacuumTestedAt DL
• Develop non-destructive sub-picosecond longitudinal bunch profile diagnostics.
• Investigate two complementary techniques: Electro-optic and Smith-Purcell radiation.
• EO: Optimise technique for ultra-short bunches
• EO: Work towards simplifying laser requirements
• EO:Investigate integration with laser timing distribution systems
• SP: Two more runs at FELIX, mid-November and Jan.-Feb. 2006
• SP: Planning for SLAC, 28GeV but different bunch structure.
• SP: Continuing theoretical work: rapid re-construction of bunch shape, other radiative processes.
• SP: Close contact & comparison with EO technique.
WP2.2 – Longitudinal profile (A. Gillespie, G. Doucas)
“crossed-polariser” configuration EO signal [Coulomb Field]2
Electro-optic Signal vs Coulomb Field
Berden, Jamison, et al., Phys. Rev. Lett. 93 114802 (2004)
measurements have been made with 150pC < Q < 300 pC
Q=300pC, E=50MeV
19LC-ABD review meeting, 24th Oct. 2005
Detector array
LC-ABD review meeting, 24th Oct. 2005
• Develop specialised tools to simulate e- / e+ spin transport through each region of the ILC.
• Simulate bunch-bunch depolarisation effects at interaction point.
• Full cradle-to-grave ILC spin polarisation simulations.
• Assess degree and robustness.
• Validate simulations against experimental data.
• Assess ILC polarimetry designs.
• Determine any additional experimental measurements required to validate software.
• Investigate polarimetry layout.
• Produce the associated simulation package.
WP2.3 – Polarisation (I. Bailey)
EGDE, Oxford, Oct05 G. Blair, RHUL 22
EGDE, Oxford, Oct05 G. Blair, RHUL 23
Bunch-Bunch Interaction Simulations
Before interaction During interaction After interaction
TESLA parameters
low Q parameters
PINIT=1.0
PINIT=1.0
• Evaluate impact of survey & alignment process on performance & operation of ILC
• Demonstrate principle feasibility of survey & alignment process based on LiCAS-Rapid Tunnel Reference Surveyor.
• Develop technological and scientific expertise necessary to provide survey & alignment system for ILC
• Evaluate case for stabilisation / monitoring system for ILC final focus for critical BDS magnets
• Demonstrate feasibility of M-FSI sensor • displacement @ nm resolution • absolute position @ mm resolution • usable for above cases
• Demonstrate relative position measurement of accelerator components in realistic accelerator environment using network of M-FSI sensors
WP3 – LiCAS/STAFF (A. Reichold)
EGDE, Oxford, Oct05 G. Blair, RHUL 25service car
measurementcar
2.5m
Mechanics Status
• Service cars for RTRS
• Measurement unit design 80%
• Compensated vacuum FSI reference interferometers
LiCAS update 26
Optics Status• pW level uncollimated short
line FSI • collimated long line FSI• Optimised LSM camera choice
3D-PiezoStage
RetroReflector
Laser
Amplifier
Splitter Tree
WP4.1 – Final Focus Luminosity Stabilisation (P. Burrows)
• Simulate (also within WP1.2):
beam transport damping ring -> IP
including ground motion, real hardware response, noise…
performance of intra-train, pulse-pulse, upstream orbit FBs
integrated FB performance + lumi stabilisation strategy
• Prototype components required for ILC intra-train + pulse-pulse beam feedback system(s): BPMs, signal processor, feedback circuit, amplifier, kicker
• Demonstrate system performance with real beam
• Collaborate with international GDE partners
• FONT4 digital FB system: prototyping and testing at ATF
• Investigation of ring -> extraction-line feed-forward system at ATF
• FONT@ESA
G. Blair, RHUL 28
FONT3 installation on ATF beamline
BPM processor board
Amplifier/FB board
FEATHERkicker
ATF beamline installation June 05
G. Blair, RHUL 29
FONT1,2,3: Summary67 ns
54 ns
23 nsEven fast enough for CLIC intra-train FB!
2002
2004
2005
WP4.2 – BPM Spectrometry (D. Miller, D, Ward)
• Development of BPM magnetic spectrometer for beam energy measurement: Resolution of 1 part in 104
Comparable stability over many hours or days• ATF NanoBPM collaboration
Basic study of cavity BPMsUltimate BPM limit (resolution and stability)2 triplets of cavities in ATF extraction lineLong term stability tests (~8 hours)
• SLAC End station ATests of the design of a magnetic chicaneOperation mode of spectrometerBPM only run in Feb/Mar 2006Full chicane tests in Autumn 2006
• Spectrometer specific BPM designsCavity designElectronicsTesting and validationElectromagnetic cavity design startedElectrical prototypes to be tested at UCL early summer 2006
EGDE, Oxford, Oct05 G. Blair, RHUL 31
EGDE, Oxford, Oct05 G. Blair, RHUL 32
WP5.1 – Helical Undulator (J. Clarke)
• Optimise undulator design solution.
• Technology decision underpinned by prototyping.
• NEG pumping validation.
• Measured + validate prototype PM / SC module performance.
• Select preferred magnet technology type.
• NEG pumping trials.
• Value engineered magnet solution.
• Electron beam transmission tests.
• Recommendations to ILC GDE.• Simulations:
Magnetic field distributions from magnets / current elements.
e- beam trajectory through undulator including effect of undulator imperfections.
Synchrotron radiation production.Spatial, energy and spin distributions.SR induced desorption of gases.Multipacting (SLAC).
EGDE, Oxford, Oct05 G. Blair, RHUL 34
Superconducting Helical Undulator
Superconducting bifilar helix
First (20 period) prototype constructed (RAL)
Design field 0.8 T
Period 14 mm
Magnet bore 4 mm
Winding bore 6 mm
Winding section 4 4 mm2
Overall current density 1000 A/mm2
Peak field (not on-axis) 1.8 T
Cut-away showing winding geometry
Parameters
EGDE, Oxford, Oct05EGDE, Oxford, Oct05 G. Blair, RHULG. Blair, RHUL 3535
Permanent Magnet Undulator Permanent Magnet Undulator PrototypePrototype
Halbach magnets (NdFeB)
20 × 14mm periods
4mm inner diameter
8 blocks per ring
8 rings per period
Field measurements ongoing at Daresbury Laboratory
} Optimised to minimise forces between halves of undulator
WP5.2 – Crab System (A. Dexter)
• Study quadrupole effects on crab rotation.• Study cavity to cavity phase tolerance and cavity to beam phase tolerance.• Study of frequency for crab cavity system.• Electromagnetic design studies.• Alternative cavity designs.• Evaluation of Fermilab 3.9GHz CKM cavity.• Planning of phase control experiments, measuring cavity to cavity jitter on existing
s.c. cavities and the performance of phase control systems.• Study of higher order modes.• Numerical multipacting study for dipole cavities.• Develop models of phase control systems.• Develop a phase control system suitable for the crabbing system.• Warm models of the Fermilab cavity to investigate trapped modes.• Evaluate minimal cavity beam clearance• Development of couplers and LOM/HOM damping systems.• Study cryostat requirements.• Undertake Daresbury ERL Prototype phase control experiment.
WP5.3 – Collimation (N. Watson)
• Development improved EM modelling methods
• Benchmarking wakefield calculations against experiments
• SLAC ESA beam test / data analysis
• RF bench tests (training/code comparisons)
• Tracking simulations with best models of wakefields
• Simulations of beam damage to spoilers
• Material studies using beam test• New spacetime covariant field-theoretic description of electron beam dynamics is under development - Includes a covariant perturbation expansion of the electric current about
the forward light cone- Exact solutions and their relation to solutions obtained using the perturbation scheme are under scrutiny- Will be used to analyse dynamics of an electron beam in collimator
geometries, predications to be compared with results from conventional EM modelling packages
EGDE, Oxford, Oct05 G. Blair, RHUL 38
Wakefield box
ESA z ~ 300m – ILC nominaly ~ 100mm (Frank/Deepa design)
Magnet mover, y range = mm, precision = 1m
1500mm
EGDE, Oxford, Oct05 G. Blair, RHUL 39
Slot Side view Beam view
1
=324mrad
r=2.0mm
2
324mrad
r=1.4mm
3
324mrad
r=1.4mm
4
=/2rad
r=4.0mm
h=38 mm
38
mm
L=1000 mm
7mm
r=1/2 gap
As per last set in Sector 2, commissioningAs per last set in Sector 2, commissioning
Extend last set, smaller r, resistive WF in CuExtend last set, smaller r, resistive WF in Cu
cf. same r, taperedcf. same r, tapered
WP? – Beam Dumps (R. Appleby)
• Test the feasibility of the gas/water dump hybrid idea, through simulation
• The gas energy density along the column• Gas dump pressure issues• Activation studies with CINDER90• Carried out by university staff, with support from experts and engineers• Deliver a report on gas dump feasibility
• The hybrid uses a shorter gas dump as a passive beam expander, in front of a water-based dump
• The idea, which arose out of discussion with target people, is very attractive– Water dump window problems eased– Beam expander failure unlikely– Other benefits e.g. reduced neutron flux coming back from the
water dump
FUTURE FUNDING OF LC-ABD
Current PPARC support ends in March 2007
Future proposed programme will need to be peer reviewed by the end of 2006 to ensure continuity.
The proposal for the next phase will need to take into account overall international status, UK role/responsibilities and timescales for TDR etc.
Funding for accelerator R&D awarded in SR2002 has been built into the PPARC baseline.
Linear collider R&D is given high priority by PPARC. There are long term commitments to the two accelerator R&D centres.
LARGE CAPITAL FACILITIES FUND
Linear collider is a bid from PPARC to the OST Large Capital Facilities Fund – separate funding line retained by OST for capital construction projects.
Prioritisation exercise currently underway of bids from all Research Councils – outcome not yet known but if given high priority, any funding could be for the construction phase only. Discussions with OST continue.
PPARC will have to balance the need to maintain momentum, with the funds available and other calls on the PPARC budget.