John Adams Institute Linear collider activities

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John Adams Institute Linear collider activities

• S. T. Boogert on behalf of
• G. Blair, P. Burrows, N. Delerue, G. Doucas,
• B. Foster, P. Karataev, S. Molloy, A. Reichold,
• D. Urner, R. Walczak
• 9th February 2009, Oxford

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John Adams Institute members

• 11 Academic group members
• Diverse research areas, focus principally on
  diagnostics and beam delivery
• Funded via JAI, STFC (LCABD 1,2,3 projects) and
  university support
• 6 new academics created via JAI on LC related
  projects

• FONT and Laserwire mature projects
• Strong collaboration
• Strong overlap with test facilities
• KEK ATF/ATF2
• SLAC End Station A
• DESY/CERN

George Doucas
Grahame Blair
Phil Burrows
Nicolas Delerue
Stewart Boogert
Brian Foster
Armin Reichold
David Urner
Pavel Karataev
Roman Walczak
Steve Molloy
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International linear collider
Feedback stabilisation
Energy spectrometer
5 laser-wire systems
Collimators, wake-fields
Bunch length, Beam position monitors, Simulation

• Involved in almost all the diagnostics required
  for the ILC
• Global systems (BPMs, bunch length, collimators,
  static alignment)
• Specialised and localised sub systems
  (Laserwires, energy spectrometer, IP beam
  feedback system, stabilisation)
• Global program
• BDSim (Geant4 based simulation)
• Test facility ATF2
• Strong overlap with CLIC and CTF3 and light
  sources

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Global design effort (GDE)

• Brian Foster
• European GDE director
• Grahame Blair
• EUROTeV instrumentation
• Change control board
• Philip Burrows
• GDE Instrumentation work-package leader
• Machine detector interface group deputy

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Beam position monitors (BPMs)
S. Boogert, S. Molloy

• High resolution cavity BPMs
• Achieved resolution of 15 nm
• Pre-cursor for all ATF2 and ILC BDS designs
• NIM A 578 (1), 2007, 1-22 (S. Boogert et al.)
• Energy spectrometer for ILC (collaboration with
  UCL/Cambridge)
• 4 magnet chicane
• NIM A 592 (3), 2008, 201-217 (S. Boogert et al)

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Advanced BPM systems
S. Boogert, S. Molloy

• Design of different high resolution BPM systems
• ATF2 C and S band systems
• Prototypes for the whole beam delivery system
• Higher order mode coupler BPM system
• Development of beam position systems in a wide
  range of accelerators
• Future light sources (FEL)
• CLIC

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Laser-wire (DESY, PETRA)
A. Bosco, T. Aumeyr
Transverse beam size measurement

• 2-Dimensional system installed at PETRAII
• Laser injection seeded Q-switched laser
• Vertical profiles of RMS size 48 ?m with 1.3
  precision in lt50s
• System upgraded and installed for PETRA III light
  source
• NIM A 592 (2008) 162-170 (A. Bosco et al)

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Laser-wire (ATF)
A. Aryshev,G. Blair, S. Boogert, N. Delerue, R.
Walczak
Test diffraction limited laser-wire system

• Started operation in 2007
• Upgraded 2008 with custom multi-element F/2 lens
• 1.6 ?m laser focus (nearly LC specification)
• Move system to ATF2 with better optics control
• Measured 3.75 ?m convoluted minimum
• NIM publication in preparation

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Basic laser physics applications
Photonic crystal fibre Laser (L. Corner)
Electrostatic laser deflector (A. Bosco)
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Beam induced radiation

• Beam generated EM radiation from polarisation of
  material
• Excellent diagnostic tool (bunch length, beam
  size)
• Non-invasive
• Radiation itself is useful THz and Gamma-ray
  generation
• Lasers conventional accelerators ODR/CDR/SP
• Transition radiation, diffraction radiation
• Beam size diagnostic, complimentary to laser-wire
• Smith-Percell and Coherent diffraction radiation
• Bunch length (single bunch, non-invasive)

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Coherent diffraction radiation
P. Karataev, M. Michler
Emission from plane conducting plate

• CDR signal observed in CTF3 combiner ring
• Building interferometer for installation this
  year
• Basic study of the CDR process
• Bunch length length diagnostic
• First observation of CDR last last year at CTF3

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Smith Purcell radiation
V. Blackmore, G. Doucas
Emission from blazed grating
e- beam
blazed grating

• Beam test at SLAC End station A (28.5 GeV)
• First multi GeV measurement
• Extract bunch longitudinal profile from spectrum
  using Kramers-Kronig method

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Feedback On Nanosecond Timescales
P. Burrows, X. Resta-Lopez
Test low latency (10-100ns) beam feedback
systems Beam orbit correction, IP luminosity
preservation
e- 1.3 GeV ATF beam
Kicker
BPM 1
BPM 2
BPM 3
Analogue BPM processor
Drive amplifier
Digital feedback
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FONT
FONT operating on ATF beam, clearly stabilised
within BPM resolution

• PAC/LCWS 24 papers
• 1 PRSTAB submitted (2 more in preparation)
• 4 PhD theses completed, 4 in progress
• Successful amplifier development collaboration
  with TMD technologies

FONT essential for ATF2 operation Hardware (BPMs,
kickers, electronics, to be installed next month)
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Linear Collider Alignment and Survey

• Goals
• Survey ILC reference network
• Accuracy O(100?m) _at_ O(km)
• Rapid and robotic
• checked with acc.

• Solution RTRS
• Sensing systems (data source rate)
• 38 FSI interferometers (210 MB/sec)
• 12 LSM cameras (298 MB/sec)
• 3 wall marker cameras (78 MB/sec)
• 96 calibrated temperature sensors
• 3 computer controlled lasers
• 12 axis of gravity reference tilt sensors

simulations
Rapid Tunnel Reference Surveyor
RTRS

• Robotics
• 25 axis of motion
• 1 ton moving mass
• 82 limit and proximity switches
• 6 network controlled picco motors
• each measurement unit moves in 6D
• 3 drive motors with 6 kW total power
• 39 CAN bus controlled stepper motors

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LiCAS Results
Frequency Scanning Interferometry
Beam Dynamics Simulations
??z4?m
Laser Straightness Monitoring
?x14?m
?y8?m
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Stabilisation MONALISA
Monitoring, Alignment Stabilisation with high
Accuracy
P. Coe
M. Warden
A. Reichold
D. Urner
Demonstrated precision
Displacements to 0.3 nm (FFI)
Interferometer Testing and Development
Distances to 150 nm (FSI)
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MONALISA ATF2 test installation
Bowtie arrangement Compact Straightness Monitor
(CSM) Combined interferometers give 3D position
measurement

• CSM at ATF-2
• between
• Shintake monitor
• QD zero (final quadrupole)
• Measures relative
• vertical displacements
• at the
• nanometre level

Test stand at Oxford
N.B. A CSM is also being designed for CLIC
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Simulation

• Develop generic tools in simulation and
  accelerator optics
• Essential for stable operation of any low
  emittance facility
• Feedbacks, diagnostics and simulation
• Standard tools such as MAD but also dedicated
  simulations
• BDSIM, PLACET, Merlin
• Hardware systems require dedicated packages
• Laser, optics (Zemax)
• Radio frequency simulation (Gdfdl, Microwave
  studio)
• Others (Ansoft deigner, ANSYS, Magik)
• Large body of general expertise developed within
  JAI

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ATF2 optics and simulation
Optics model verification
FONT ATF2 simulation

• ATF2 major test facility for ILC like optics,
  diagnostics, operations
• Currently commissioning
• Feedback operation essential for stable ILC like
  focus
• Verify optics models, online verification of
  optical models on running accelerator

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Beam delivery simulation
J. Carter (RHUL. Ph.D. 2007)

• 20mr losses lt 100W/m at 500GeV CM and 1TeV CM
• 2mr losses are at 100W/m level for 500GeV CM and
  exceed this level at 1TeV
• Radiation conditions and shielding to be studied
• Built using BDSIM developed JAI at RHUL

J. Carter, I. Agapov, G.A. Blair, L. Deacon
(JAI/RHUL), A.I. Drozhdin, N.V. Mokhov
(Fermilab), Y.M. Nosochkov, A.A. Seryi (SLAC)
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Summary

• Intellectually the JAI could start building or
  engineering almost all of the diagnostics and
  interesting devices for ILC
• ILC developments completely applicable to CLIC or
  other LC technologies
• Overlap with light sources, LHC, proton machines
  are being exploited
• Almost all systems represent the best in field
• Leadership in GDE and technical sub-systems
• Strong involvement in ATF2
• Excellent near term opportunity supported by JAI