Ongoing

1
Ongoing Planned BDS work

• Deepa Angal-Kalinin
• ASTeC
• Daresbury Laboratory (CCLRC)

2
Ongoing and Planned BDS work in the UK

• LC-ABD 3 Years funded programme on BDS by
  PPARC/CCLRC (Started from April04) G. Blair
  P. Burrows (PI PM)
• 5 work packages
• Lattice design and simulations (D.
  Angal-Kalinin)
• Advanced Beam diagnostics (G. Blair)
• Alignment and Stabilisation (A. Reichold)
• FONT Spectrometry (P.Burrows)
• Technology (M.Poole)
• Polarised positron Undulator
• Crab Cavity
• Collimation
• 20 (from 23) new posts have been filled.

3
Linear Collider Accelerator Beam Delivery
(LC-ABD) Project 14 UK Institutes
4
EUROTEV

• 3 years project funded by EU from Jan05
• BDS
• Diagnostics
• DR
• PPS
• ILPS
• Metrology stabilisation
• GAN
• All the LC-ABD work packages are contributing.
• Some additional support requested.

5
EUROTeV WP2 BDS Overview
WP2 BDS
BDSLD
CRABRF
FFBK
SWMD
SCFD
Spoiler Wakefields Mechanical Design
Super-conducting Final Doublet RD
Crab cavity RF system Design
BDS Lattice Design
Fast Feedback System Design
CCLRC ULANC
CCLRCCEA CERN
CCLRCCERN TEMF UMAN ULANC
QMUL CCLRC
CEA
Tasks cover critical design choices for the BDS
6
Work at CCLRC Beam Optics

• ASTeC Accelerator physics group Linear Collider
  Studies
• D Angal-Kalinin
• Rob Appleby
• Frank Jackson
• James Jones (50)
• LC-ABD optics post at Liverpool (Crockcroft
  Institute)
• Collaborations with
• J.Payet, O. Napoly, Saclay
• P.Bambade, B. Mouton, Orsay
• A. Drozhdin, FNAL
• N. Walker, DESY

7
Final Focus Optimisation

• Set up the local chromaticity correction
  optimisation procedure MADBETADIMAD
• FFS with final quadruplet for the small vertical
  crossing angle scheme to reduce the beam size of
  the low energy tail particles in the extraction
  line
• Contribution of each higher order aberration to
  beam size ? Lie algebra techniques to understand
  which aberrations should be minimised (LAMAN.
  Walker)
• Working with J Payet on the global optimisation
  for FFS design in his code BETA

8
Collimation Studies

• Using MERLIN and STRUCT

NLC
TESLA
NLC and TESLA halos at final doublet (Uniform
phase space, 1 energy spread, MERLIN 2nd order
transport)
Frank Jackson
9
Extraction Line

• Studies for the Small vertical crossing angle
  for ILC
• extraction line
• 2 mrad crossing angle extraction line design

1-1.9m
3m
lt 2 mrad
l4.1m
6 mrad
1.3-2.3m
? optical transfer
R Appleby, P Bambade et al
to beam diagnostics
10
Beam optics work plan

• Extraction line design for 2 mrad, cross check of
  20 mrad optics and losses, beam diagnostics (with
  Andrei, Yuri, Brett, Cherrill)
• ILC final focus design for different L, improve
  TESLA L3,4,5m lattices with long drift of 250m
  to third/higher order (Jacques new optimisation
  code Andreis tools ) for the ILC.
• Study beam collimation efficiency for the ILC
  decks using STRUCT and MERLIN.
• Locations of specialised/generic beam diagnostics
  devices, required specifications (Energy
  spectrometer with UCL group)
• Ground motion modelling
• Tuning procedures
• ATF2 optics, tolerances/tuning, upgrade to 1 TeV
• ESA optics focussing the beam to small sizes at
  the collimator location.

11
Crab Cavity Team

• Graeme Burt
• Amos Dexter
• Philippe Goudket
• Alexander Kalinin
• Carl Beard
• Mike Dykes (RF Group Leader)
• Mike Poole (WP leader)
• One more post will be recruited soon at Daresbury
  one more post requested at Lancaster from
  EUROTeV.

12
Crab cavity Phase stabilization Test System
The team is considering which engineering issues
can be resolved by the phase stability experiment
proposed by J.Frisch.
13
Crab cavity Issues

• Position of crab cavities
• Type of crab cavity
• Frequency of operation
• Phase jitter, field stability ? Luminosity?
• Effect of wakefields i.e. cavity harmonics
• Performance of phase control systems

14
Spoiler Wakefields and Mechanical Design

• Simulation code to correctly simulate
  geometric/resistive wake fields of spoilers,
  spoiler designs, material damage, validation of
  simulations against measurements.
• Specifications of spoilers
• Material Damage studies
• Cold test measurements set up
• Fabrication of spoiler prototypes
• Development of wake field simulation codes
• Spoiler beam tests at SLAC test facility
  (discussions with P.Tenenbaum, Mike Woods, Ray
  Arnold ? N. Watson)

15
Collimation Programme

• RF impedance bench tests Beard, Sopczak, RA, R
  Carter
• Benchmark against known spoiler profile, large
  taper angle, MAFIA etc.
• Use cold test results to
• Provide data to assist development of improved
  e.m. modelling in problematic regimes
• - Also within UK, build up expertise (non-LC
  applications)
• - (Within EUROTeV) collaborate with TU Darmstadt
• Alternative spoiler profiles, (at least) relative
  performance
• Theoretical studies Tucker, Burton, Shales
  (Lanc.)
• Direct beam measurement at SLAC CCLRC, Lanc.,
  Birmingham
• EUROTeV ? extend into material damage studies
• CCLRC Engg Department, Manchester, Birmingham

16
To summarise.

• Ongoing discussions with SLAC on beam optics,
  tuning, crab cavity, collimation, wake field
  measurements.
• Hope for a strong collaborative work for the ILC
  in the coming months!

17
Polarised positron Undulator work at CCLRC J.
Clarke

• Need a short period
• more periods
• more photons
• more positrons
• Two competing designs both 14mm period and 4mm
  beam aperture

• Permanent Magnet Ring undulator

• Super-Conducting Bifilar helix

18
Permanent Magnet Test Module J.Clarke
Magnet block assemblies being manufactured Due
end Jan 05 Other components currently being
manufactured at Liverpool Assembly begins
February Followed by Magnet Measurements at
Daresbury
19
Positron Undulator J. Clarke

• Two test modules based on SC and PPM technology
  are being built
• Entire magnet (200m) pushes the limits for
  engineering design and construction of PPM and SC
  undulator magnets

'Workshop on Positron Sources for the
International Linear Collider Daresbury
Laboratory , 11-13th April05 The workshop will
discuss relevant issues for positron production
for the ILC. http//www.astec.ac.uk/id_mag/ID-Ma
g_Helical_ILC_Positron_Production_Workshop.htm
20
Thanks to Andrei, Mark Woodley, Mike Woods,
Mauro, Marc Ross and Arnold for very useful
discussions!