PARTICIPATION IN THE DESIGN AND R

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PARTICIPATION IN THE DESIGN AND RD ACTIVITIES
FOR A FUTURE LINEAR COLLIDER


Accelerator and Detector aspects
A. Faus-Golfe IFIC - Valencia
FPA2005-02935
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Outline

• Scientific project
• Main goals
• Accelerator Physics
• Machine Detector Interface
• Detectors
• Personnel Task

See Carlos Lacastas Talk
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Scientific project Main
Goals

• Our project pretends to initiate/consolidate
  the participation of the IFIC to the ILC effort
  in both aspects

• Detector

• Machine

• Machine Detector Interface

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Scientific Project Main Goals
Accelerator aspects

• The IFIC participation has already started with
• A feasibility study of a non-linear collimation
  system for CLIC in 2002 in collaboration with
  CERN. A doctoral thesis started in the beginning
  of 2004 Design and Performance Evaluation of a
  Nonlinear Collimation System for CLIC and LHC
  (CERN doctoral students program)
• Participation in the European Project CARE-ELAN
  in the beginning of 2004
• Participation in the specific design study
  EUROTeV, approved in late 2004

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Scientific Project Main Goals
Accelerator aspects

• Feasibility of a non-linear collimation system
  for

• Design Optics
• Non-linear impact on the BDS
• Cleaning efficiency
• Spoiler survival
• Application to other collimation systems (LHC,
  ILC)

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Scientific Project Main Goals
Accelerator aspects
Ongoing work
See A. Faus-Golfe talk in Nanobeam 05 and CLIC
BDS Day

• Design Optics
• Optics with bends between the skews shows better
  performance from the collimation efficiency point
  of view but there is no complete cancellation of
  the geometric aberration and the luminosity is
  very poor
• New optics with no bends between the skews to
  avoid the luminosity degradation keeping good
  collimation efficiency
• T.Asaka, A.Faus-Golfe, J.Resta López, D. Schulte
  and F. Zimmermann Alternatives Design for
  Collimation system To be published

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Scientific Project Main Goals
Accelerator aspects
1st optics solution
No bends between the skews
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Scientific Project Main Goals
Accelerator aspects
2nd optics solution
Bends between the skews
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Scientific Project Main Goals
Accelerator aspects

• Ongoing work
• Collimation survival
• install perfect spoiler perform simulations
  with MAD and PLACET
• T.Asaka, J. Resta López Characterization and
  Performance of the CLIC BDS with MAD, SAD and
  PLACET ELAN (2005)
• consider real spoiler with scattering, install
  absorbers, optimize absorber locations, run BDSIM
  or SIXTRACK or MARS simulations (linear system
  already contains spoilers and absorbers)
• Drozhdin et al, Comparison of the TESLA, NLC
  and Beam Collimation system performance CLIC
  Note 555 (2003)
• Chromatic properties Luminosity performance
  Beam size at the spoiler vs sextupole strength
  average momentun off-set

See J. Resta López talk in CLIC BDS Day
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Scientific Project Main Goals
Accelerator aspects
Entrance
IP
Importance of the benchmarking of codes
Guinea-Pig
Multiparticle tracking
Optics lattice
Beam-beam interaction
transport
performance
MAD Placet SAD
Lie
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Scientific Project Main Goals
Accelerator aspects
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Scientific Project Main Goals
Accelerator aspects
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Scientific Project Main Goals
Accelerator aspects
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Scientific Project Main Goals
Accelerator aspects
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Scientific Project Main Goals
Accelerator aspects
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Scientific Project Main Goals
Accelerator aspects
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Scientific Project Main Goals
Accelerator aspects
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Scientific Project Main Goals
Accelerator aspects
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Scientific Project Main Goals
Accelerator aspects
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Scientific Project Main Goals
Machine Detector Interface

• Design study of the disrupted and energy
  degraded beam after the IP. Impact in the
  tracking performance. Simulations based on
  realistic beam conditions including the halo
• identify and estimate losses in the spent beam
  transport line
• study of installation of relevant post-IP beam
  diagnostic (luminosity, energy and energy spread
  and polarisation monitors)

A doctoral thesis started in the beginning of
2005 Design and Performance Evaluation of the
MDI system for the ILC (EU doctoral students
program)
Collaboration
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Scientific Project Main Goals
Machine Detector Interface
Ongoing work

• Beam parameters for e-e- mode operation at the
  ILC
• e-e- shows sharper deflection curves (feedback
  slower) and faster luminosity drop with offset
  (more stringent constraints on residual offset)
  that makes feedback very difficult
• Alternative beam parameters increase of sy
  (steepness can be reduced at the expense of a
  factor 2 in L) and decrease sx (smoother
  deflection curve and partly recovered L at the
  expense of a factor 2 in db)
• C.Alabau, P.Bambade and A.Faus-Golfe,
  Beam-Beam parameters for e-e- mode operation at
  ILC To be published

See C. Alabau talk in ECFA Study on Physics and
detectors for ILC
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Scientific Project Main Goals
Machine Detector Interface
Increasing sy
e-e- Deflection Angles (sxsxo)
e-e- Luminosity (sxsxo)
e-e- Beamstrahlung Loss (sxsxo)
- better deflection curve
- lower luminosity (factor 2)
- similar beamstrahlung energy loss
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Scientific Project Main Goals
Machine Detector Interface
Decreasing sx
e-e- Deflection Angles (sx0.5sxo)
e-e- Luminosity (sx0.5sxo)
e-e- Beamstrahlung Loss (sx0.5sxo)
- better deflection curve / luminosity
- greater beamstrahlung energy loss
problems for beam extraction (maximum 5-6)
problems for physics?
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Personnel Tasks
TASK

PERSONNEL Feasibility of a non-linear
collimation system A.
Faus-Golfe Particle tracking along BDS
J. Resta
Lopez Machine Detector Interface
A. Faus-Golfe

J. Fuster
Verdú

C. Alabau Pons RD on Si Detectors
C.
Lacasta Llacer Participation on the design of
tracking system J. Fuster Verdú

Post-doc

I.
Carbonell

Mechanical Eng.
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Other related Project
Accelerator aspects

• Further work
• Beam Instrumentation for TBL at CTF3/CLEX

• Mechanics

See F.Toral and Y. Kubyshin talks