UK Beam Delivery System Project Status

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UK Beam Delivery System Project Status
Philip Burrows Queen Mary, University of London

• Linear Collider
• Accelerator Beam Delivery Collaboration
• (LC-ABD)

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UK Beam Delivery System (BDS) Project

• Aim RD to position UK to lead in design/supply
  of BDS
• Proposal peer-reviewed by PPRP 22 October 2003
• Reconciliation process PPARC/CCLRC/Institutes
• Presented at JCBoard 12 January 2004
• Approved Science Committee January 27 2004
• 9M PPARC (7.2M new 1.8M RG) 1.5M CCLRC
• 1 April 2004 31 March 2007

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LC-ABD Collaboration

• Abertay Bristol
• Birmingham Cambridge
• Durham Lancaster
• Liverpool Manchester
• Oxford Queen Mary
• Royal Holloway University College London
• Daresbury Lab. Rutherford-Appleton Lab.
• Grahame Blair (PI), Philip Burrows (PM)
• 41 post-doctoral physicists (faculty, staff,
  research associates) technical staff graduate
  students
• 23 new posts (16 to be filled)

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LC-ABD Recruitment Drive
Lord Sainsbury visits FONT at NLCTA June 8 2004
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Project Overview

• Lattice design and beam simulations
  (Angal-Kalinin)
• Advanced beam diagnostics (Blair)
• Alignment and survey (Reichold)
• Final focus luminosity stabilisation and
  spectrometry (Burrows)
• Technology (Poole)

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1. BDS Lattice Design and Beam Simulations
(Daresbury, Liverpool, Manchester, QMUL, RHUL,
UCL)

• 1.1 BDS Lattice design (Angal-Kalinin)
• Forming an optics core team working to improve
  the TESLA BDS
• Design
• Expertise being developed for
• Final Focus Optimisation (Collaboration with
  Saclay)
• Beam Collimation (Collaboration with DESY)
• Beam extraction and IR issues (Collaboration with
  Saclay, Orsay, DESY)
• Beam-beam interactions
• Codes for these studies have been implemented
• 1.2 Beam transport simulations and backgrounds
  (Jones/White)
• Ground motion
• Damping ring to IP beam transport
• Halo production and tracking through BDS
• Backgrounds pairs, gammas, neutrons
  

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Optics for small vertical crossing angle at TESLA
Doublet
Quadruplet
Presented at LCWS04 and in TESLA collaboration
ELAN meetings
Beam sizes of low energy tail particles at 50m
down the extraction line.
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TESLA Extraction Line Studies

• Redesign extraction line for new FF lattice
• Introduce finite IP angular dispersion as a
  correlation into the disrupted beam phase space.
• Disrupted beam parameters generated using
  GUINEAPIG and tracking down the extraction line
  done using NLC version of DIMAD.

Generated by tracking through final focus to IP
vertical phase space
horizontal phase space
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Future Work

• Develop FFS optimisation procedure to third
  fourth order.
• Develop details of hybrid crossing angle designs
  for TESLA.
• Reproduce TRC results on TESLA collimation.
• Implement STRUCT for collimation. Compare STRUCT
  with MERLIN simulations.
• Understand the NLC collimation optics design and
  compare with TESLA
• Work out improved BDS optics solution for TESLA
  (beam switchyard, collimation, diagnostics
  section, extraction line design to save head-on
  scheme, final focus system).
• Study the NLC/GLC optics to be able to contribute
  to any technology decision.

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1.2 Beam Transport Simulations (QMUL)

• Damping ring - IP simulations (Glen White)
• QMUL GRID cluster (128 nodes)
• PLACET MATMERLIN GUINEAPIG/CAIN or
• MATLIAR GUINEAPIG/CAIN
• Plan to include fast angle luminosity
  optimisation using crab cavity and wakefield
  effects of spoilers and collimators.
• www respository for LC programs and data for
  ELAN BDYN work package.
• Effect of jitter of nominal beam parameters on
  luminosity and beam-beam kick/FB system (Shah
  Hussain, Ph.D. Student)
• Interaction region background simulations (Tony
  Hartin)
• effect of EM backgrounds on FB components and
  the knock-on backgrounds produced in the vertex
  and tracking detectors.
• Currently GEANT3, migration to GEANT4 under
  study.

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Example banana bunches, impact on FB

• Banana bunch (PLACET/MERLIN)

Gaussian bunch
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Beam Transport simulations (ASTeC)

• Ground motion modelling reproduce TESLA TDR
  ground
• motion
• Applying to new BDS with NLC like optics to
  confirm ok
• MAD, TRANSPORT, BETA, TURTLE, DIMAD implemented.
• MERLIN (with root graphics) for collimation
  simulations.
• For Extraction line studies, GUINEAPIG NLC
  version of
• DIMAD implemented.

Dump
IP
BDS
BDS-to-dump simulations
extraction
start
end
MERLIN DIMAD
Mathematica Interface/control
GP
DIMAD
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Tracking of halo energy deposition (BDSIM)
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Executive Summary

• Set up tools, and started serious work
• Task 1.1
• New Staff (ASTeC) - Rob Appleby, Frank Jackson
• Liverpool RA will be advertised soon
• Task 1.2
• RHUL RA advertised April04
• Manchester RA will be advertised soon

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2. Advanced Beam Diagnostics

• 2.1 Laserwire (RHUL, Oxford, UCL)
• Ongoing collaboration on PETRA
  laserwire project
• UK building laser scanning system
  (multidirection)
• Simulations halo backgrounds,
  diagnostics layout
• 2.2 Bunch longitudinal profile (Abertay, DL,
  Oxford)
• Very successful electro-optic bunch
  length expt. at FELIX
• RD on Smith-Purcell radiation bunch
  profile monitor (Frascati)
• possible deployment at FELIX
• 2.3 Polarisation (Durham, Liverpool)

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2.1 Laser-wire

• PETRA laser-wire produced first scans in December
• 2003
• Major upgrades complete in electronics, DAQ,
• diagnostics and laser tuning.
• Full simulations are improving and have shown the
  
• need for a vacuum window
• New run in July 04
• Start design of new vertical beam-line optical
  table
• July 04
• New beam-pipe element with vacuum window is
• currently being designed at DESY.

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PETRA Milestones
Construction Installation PETRA March 03
First full scans Dec 03 sm (68 3 20) µm at
low PETRA current
? laser pulse structure full simulations
? Studies ongoing and converging.
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ATF Extraction Line Laser-wire
June 04 Scope, Location and Laser agreed with
KEK. First designs of vacuum chamber and optics

• 5 ?m electron spot-size, bunch spacing 2.8 ns.
• Study jitter effects in environment similar to
  BDS.

? Advanced Optics
Vacuum vessel integrated diagnostics?
electronics DAQ
Future location at ATF extraction line
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2.2 Bunch profile measurement electro-optic
Propagating electric field
polariser
chirped probe beam
EO crystal
Spectral decoding OR Temporal decoding
Effective polarisation rotation proportional to
coulomb field
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Real time monitoring and bunch profile
modification (FELIX measurements)
Bunch profile modified by changing the buncher
and accelerator phase.
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Electro-optic Summary

• Low-resolution electro-optic bunch length
  measurement
• two data runs in last 6 months 300 fs achieved
• Spectral and temporal decoding techniques
• spectral has fundamental limitations
  (artefacts)
• temporal entirely free of these effects -gt sub
  100 fs
• Investigating FROG (frequency-resolved optical
  gating) techniques to characterise very short
  electron bunches.
• Materials issues will come to the fore as we push
  towards shorter bunch lengths, and these issues
  are as yet unclear.
• Paper submitted to PRL

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2.2 Bunch profile measurement Smith-Purcell

• Two pilot runs at FELIX in January and February
• Preliminary results presented at the ELAN
  meeting, Frascati, May 2004.
• Designed array of 11 far-infrared pyroelectric
  detectors simultaneous detection of the radiated
  power over a wide range of wavelengths. Delivery
  is expected in about 4 weeks.
• C.Perry has redesigned the detector electronics
  increased bandwidth and 10X noise reduction.
• The next run at FELIX may be in early October
• Electromagnetic field calculations from periodic
  structures are continuing.
• New student (V. Blackmore) will join Oxford in
  October.

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2.3 Polarisation Transport Polarimetry

• Detailed working discussions started.
• See talk by G. Moortgat-Pick this afternoon.
• About to advertise new RA position.

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3. Alignment and Survey (LiCAS)(Oxford)
Internal FSI system Dz. Dx,Dy Da,Db between
cars
External FSI system measures wall marker location
Straightness Monitor Dx,Dy Da,Db between cars
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New Collaborators

• Johannes Prenting
• Markus Schloesser
• Ernst-Otto Saemann

Gregorz Grzelak
Andreas Herty
CERN Micro Technology and Instrumentation section
of SU group are interested joining RTRS and
LiCAS development effort
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LiCAS Survey Car Design
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Laser Straightness Monitor Design

• Invar body
• 4CCD camera
• LSM beam returned by retro reflector
• 6 internal FSI lines
• 6 external FSI lines

• unit is evacuated
• bellow system allows for position and orientation
  adjustment
• see external target
• capture LSM beam

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LiCAS Hardware Development

• Prototype survey car
• 2004 Single-car sensor
• 2005 3-car prototype deployed in dedicated 70m
  tunnel at DESY
• 2007 5-car prototype available for use in TESLA
  XFEL tunnel

Prototype readout board
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2nd tunable laser short long line FSI
systems prototype two lasers in same line for
drift compensationOptical tables 3x1.5 m2
reference interferometry and frequency
measurements long (5m) long line tests and
single car test bed8 channels of fast ADCs
for long lines _at_ full tuning speed to be
replaced by custom ADC boards
Laser enclosure
Straightness Monitoring
Long FSI test stages
Motion control rack
Vibration isolated optical table for FSI
reference interferometers
FSI rack
USB-2 DAQ development
5 x 1.5 m2 table
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New FSI Work
Splitter Tree

• Short 6-line FSI system for 3D wall marker
  reconstruction. Expect data August 04

Amplifier
Laser
Retro Reflector
3D-Piezo Stage
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Fig 1 SIMULGEO Error propagation for a single
Stop of the RTRS in mm and mrad
m
m
m
Sigma m
Sigma m
Sigma rad
m
m
Sigma m
Y-position m
m
Y-residual m
Fig 3 Residuals between 1000 random walk
Simulations and a straight line over 600m
Fig 2 SIMULGEO Error propagation over 15 stops
and fit of random walk model 600m extrapolation
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Ongoing Work

• LSM
• Setting up 6-DOF 5m test and calibration system
  with 4 cameras in realistic geometry
• New analytical model of calibration procedure
• SIMULGEO simulation of calibration procedure
• FSI
• Setting up 0-5m long single line test stand for
  beam profiling acceptance measurements
• EuroTeV, WP METSTB
• Additional funds for stabilisation work
  collaboration with LAPP

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4. Beam-based Feedback BPM/Spectrometry(DL,
Cambridge, Oxford, QMUL, UCL)

• Intra-train beam feedback is last line of defence
  against ground motion

Energy precision lt 10- 4 BPM stability/timing
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International Fast Feedback Collaboration

• FONT
• Queen Mary Philip Burrows, Glen White, Tony
  Hartin,
• Stephen Molloy, Shah Hussain, Christine
  Clarke 2 new staff
• Daresbury Lab Alexander Kalinine, Roy Barlow,
  Mike Dufau
• Oxford Colin Perry, Gerald Myatt, Simon Jolly,
  Gavin Nesom
• SLAC Joe Frisch, Tom Markiewicz, Marc Ross,
  Chris Adolphsen, Keith Jobe, Doug McCormick,
  Janice Nelson, Tonee Smith, Steve Smith, Mark
  Woodley, Linda Hendrickson
• FEATHER
• KEK Nicolas Delerue, Toshiaki Tauchi, Hitoshi
  Hayano
• Tokyo Met. University Takayuki Sumiyoshi,
  Fujimoto
• Simulations Nick Walker (DESY), Daniel Schulte
  (CERN), A. Seryi (SLAC)

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Beam Feedback Luminosity Recovery
Position scan
Angle scan

• G/NLC
• recover gt 80 of
• design luminosity

• TESLA
• gt 95
• feasible

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FONT2 beamline configuration
Dipole and kickers
New BPMs
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FONT2 results (Jan 04) feedback BPM
Beam starting positions
Beam flattener on
Feedback on
Delay loop on
Latency 53ns
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Next steps ATF extraction line (KEK)

• control 1 GeV beam at 1 micron level
• gtsame kicker amplifier and BPM
• technology
• as control of LC beam at nm level
• FONT3 tests at KEK (June 04)
• characterise beam jitter and test
• superfast BPM system lt 20 ns
• FONT3 closed-loop runs
• spring/summer 2005

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2006 Nano Project at KEK ATF
UK FONT-style feed-forward and/or feedback
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Plans for BPM Spectrometry T- 474
(SLAC)(Cambridge, UCL, DL)

• UK BPM stage
• Run June 2005
• Hiring 2 RAs

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5.1 Technology Polarised e Undulator
(Daresbury, Liverpool)

• Polarised positron undulator design
• Baseline method for TESLA, in
  consideration for NLC
• Polarised e -gt helical undulator
  (E166 expt / SLAC)
• Design work for TESLA helical
  undulator in progress
• Detailed engineering design,
  prototyping, test with beam

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5.2 Crab Cavity (Daresbury, Lancaster)

• Setting up design team
• RA to be recruited
• based at Cockcroft
• Study of cavity parameter requirements
• Build prototype cavity with power source
• Test cavity phase stability
• Engineered design for LC

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5. 3 Collimation(Birmingham, Daresbury,
Lancaster, RAL)

• Collimation Region Design
• concentrate on (poorly understood) transverse
  wakefields
• Scope adjusted to fit resources (largely CCLRC)
  advertise RA (Lcr)
• design and simulation of novel spoiler profiles
• extension of modelling into long structure/short
  pulse region
• "cold" tests short pulse down wire along centre
  of structure
• frequency scan
• beam test with SLAC death ray wakefield box
• simulation of damage to spoiler materials
• Addition of proposed EUROTEV funding would allow
• more wakefield simulation/modelling
• material damage studies (allow hardware tests)
• collaboration with CERN, TEMF

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Summary and Outlook

• Embarked on a substantial UK LC BDS project
• Huge amount of work in progress!
• Aiming to build a strong, coherent design team
• aim to be major player in Global Design
  Office (start 2005)
• aim to prepare UK funding agencies for a UK
  LC contribution
• Collaborating w. European partners via
  Framework 6 programme
• funded ELAN LC network to facilitate
  collaboration
• Eurotev design study proposal favourably
  reviewed