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Goal of the BNL-FERMILAB-CERN collaboration The codes BB tune foot-prints DA studies. BNL trip. Goal of the BNL-FERMILAB-CERN Collaboration. Benchmaking of the codes Lifetrac SixTrack SimTrack DA and Tune foot-prints in view of BB. The Codes I. Lifetrac (Fermilab)

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Bnl trip

BNL trip


Goal of the bnl fermilab cern collaboration

Goal of the BNL-FERMILAB-CERN Collaboration

Benchmaking of the codes

Lifetrac

SixTrack

SimTrack

DA and Tune foot-prints in view of BB


The codes i

The Codes I

Lifetrac (Fermilab)

Weak-strong BB code (e-p colliders 1995)

Non-equilibrium distributions (2003-2004)conventional macro particle tracking code

Machine lattice 6D map + thin multipoles

Beta-functions from MAD-X TWISS

Thin multipoles from MAD-X

RF sinusoidal kick

First and second order chromaticity via additional deltap phase advance and “chromatic drifts” before and after IP.

6D Hirata of sliced head-on, parasitic are thin

Introduction of noise once per kick

10’000 particles 1e6-1e7 turns  better beam emittance and lifetime:

Averaging density distribution over simulation step (10’000 turns)

Weighted distribution with more particles in the tails

MPI with non-interacting nodes


The codes ii

The Codes II

Sixtrack

Traditional single particle element-by element code

Extended Hamiltonian (bad for extremely large deltap)

Symplectic treatment of thin and thick (second order) elements  full Ripken theory

6D extended Hirata BB formalism (Ripken)

Full differential algebra and NormalForm implementation a pre-PTC approach

Optimized for speed

Elaborate run environment for massive tracking runs


The codes iii

The Codes III

SimTrack (BNL)

C++ library

4th order symplectic integrator

4d and 6d BB

Benchmark Tracy II and BBSIM

Many elements

Parameter change on the fly

RHIC Au run and BB head-on compensation

Particle loss

emittance growth & lifetime

Linked to Mathematica: SVD, polynominal fitting etc.


The codes iv issues

The Codes IV (issues)

Lifetrac

How well can the lattice approximation work compared to the real thing?

No tune foot-print available (work in progress)

Sixtrack

The thick lens part is presently not fully operational but can be easily replaced by going to thin mode

No plans for emittance growth nor lifetime

SimTrack

Thinlens lattice not fully readable

No BB crossing angle implemented

Compare Lifetrac and SixTrack for LHC case

Tune foor-prints for RHIC


Conclusions

Conclusions

The approximations of Lifetrac are not that bad

Tune foot-prints from Lifetrac are highly desirable and will come

Lattice and NL are reasonably well represented to trust lifetime and emittance growth (of course has to be tested separately)

SimTrack agrees well concerning tune foot-print but longterm tracking needed to check reliabilty

Experiments sorely missed!


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