AMRCPA ILC modeling

1
AMR/CPA ILC modeling Panagiotis Spentzouris
2
Accelerator Simulation in CPA

• Our activities focus on developing and applying
  (few, selected applications) accelerator
  modelling capabilities, utilizing (when
  possible) existing codes (SciDAC project
  leveraged)
• Multi-particle dynamics framework (5 years)
• Parallel computing
• Single particle optics libraries (15 years!)
• Emphasis on infrastructure and move towards
  producing user oriented software

3
Resources

• L. Michelotti (optics applications), J.
  Amundson (parallel framework, multi-particle
  dynamics applications), E. Stern
  (multi-particle dynamics applications), D.
  Dechow (frameworks visitor-), V. Ivanov
  (electromagnetics, optics), P. Spentzouris
  (multi-particle dynamics applications).
• Also, utilize external resources

SciDAC collaboration (members since '01) develop
apply parallel community codes for design and
operation optimization. Funds received June
'05-June '06 150k 1 FNAL resident collaborator
funded by a phase-II SBIR (TechX) SciDAC-2
proposal submitted (FNAL lead institution)
Phase-I SBIR (starts Oct '06) awarded (Tech-X)
4
Examples of '06 activities

• Utilize mature 3D space-charge capabilities
• Study Booster losses ILC Damping Ring
• Validate beam-beam 3D multi-bunch model
• Apply to Tevatron potentially ILC IP
• Start gaining experience in e-cloud modeling
• Main Injector upgrades, also targeting ILC
  Damping Ring
• Develop expertise in ILC Low Emittance Transport
  design
• Adapt CHEF (ILC applications in Paul's talk)
• Release Synergia2 (parallel framework)
• Multi-physics capabilities
• Begun Electromagnetics modeling (ILC crab cavity)

5
CHEF

• Mature beam physics software originally
  developed for protons
• Recent emphasis on packaging and user interface
• Extended CHEF libraries to handle electrons and
  ILC specific physics requirements (cavities,
  wakefields)
• Applied to
• ILC LET (see P.Lebrun's talk)
• ILC DR
• CHEF libraries are also used for single
• particle optics in Synergia

Collaborative Hierarchical Expandable Framework
arbitrary order Lie maps (single particle
optics) MAD parser automatic differentiation,
numerical integration.
6
Beam-beam

• 3D, multi-bunch, multi-IP capabilities
• Utilize BeamBeam3D (SciDAC), adapt for Tev
  requirements
• Realistic lattice, multi-bunch/IP scheme
• Model validation
• Relevant to ILC IP (requires development)

2-bunch coherent 4-bunch coherent
7
Fermilab SciDAC product Synergia
Synergia2 released in '06

• Synergia1 emphasis on user interface and
  space-charge
• Synergia2 flexible efficient
• Multi-physics realistic models
• State of the art numerical libraries, solvers,
  physics modules

Synergia1 mature code (JCP '06) Participated in
international space-charge benchmark effort
lead by I.Hofmann (GSI) (PAC'05)
Synergia2 will be used in JHF MR commissioning!
8
Synergia activity highlights

• Synergia used to study Booster halo creation
  emittance dilution
• Beam studies, turn-by-turn profiles (IPM, our
  calibration PRSTAB '03)
• 3D model enables study of phase space
  correlations
• Study dynamic apperture
• Fully 3D Damping Ring space-charge CSR modeling

3D Booster simulation including injection, rf
ramping, etc. Comparison with experimental data
New technique for halo characterization using
beam shape (submitted to PRSTAB)
9
PCAC Cluster
Parallel Cluster for Accelerator Computations

• CPUs
• 48 dual Xeon 2.4 GHz
• up and running
• 20 dual Xeon 3.2 Ghz (ILC)
• not yet installed/configured
• Networking
• Myrinet in all machines
• 80-port Myrinet switch
• Head nodes
• 2 dual Xeon 3.0 GHz
• 1 more on order

10
Synergia performance

• Utilized NERSC SP3 and Linux clusters
• Studies of parallel performance
• Case-by-case optimization
• Optimization of particle tracking

11
Electron cloud simulations

• Develop Synergia module based on txphysics
• Begun studying cloud generation for MI upgrade
• Begun studies of e-cloud effects in beam dynamics
  using QuickPIC (SciDAC, working with USC)
• Very important effect in ILC DR design!

MI upgrade e-cloud creation
12
ILC DR modeling status

• Objective is multi-physics modeling
• Begun lattice studies (CHEF)
• Develop CSR module for CHEF
• Expand cluster for DR dedicated studies (20
  nodes)

G.I. CHEF DR lattice
13
ILC DR studies with CHEF
14
Electromagnetics

• Access to state-of-the-art codes through SciDAC
• Develop local expertise (newly hired guest
  scientist)
• Provide simulation support to ILC crab cavity
  design
• If SciDAC-2 proposal successful, expand wakefield
  calculations to ML and DR
• Use in beam dynamics model
• Design support(if SciDAC2)
• HIGHLY LEVERAGED!

15
VORPAL crab cavity modeling
E-transverse
E-axial
16
Outlook

• Wealth of expertise but capabilities are manpower
  limited
• Could efficiently utilize postdocs
• Emphasis on multi-particle, multi-physics ILC
  simulations
• Space-charge impedance CSR (ILC DR)
• Beam-beam quantum effects (ILC linac)
• E-cloud generation dynamics space-charge (ILC
  DR, MI)
• Wakefield calculation
• For beam dynamics design
• Develop apply generalized steering package for
  ILC studies

Require SciDAC2 or equivalent additional resources