CLIC Team MAD-X Day, September 4, 2003

MAD-X for CLIC

H. Braun, R. Corsini, T.d’Amico, A. Faus-Golfe, M. Korostelev, S. Redaelli, T. Risselada, D. Schulte, F. Tecker, and F. Zimmermann for the CLIC Team

• applications of MAD8 to CLIC & CTF3• minimum requirements for MAD-X• desirable extensions

CLIC Team MAD-X Day, September 4, 2003

CTF-3

CLIC Team MAD-X Day, September 4, 2003

3 TeV CLIC

CLIC Team MAD-X Day, September 4, 2003

Past and Present Applications of MAD8 to CLIC & CTF3

CTF-3 Linacs & RingCombiner Rings -> FrascatiTransfer LinesBeam Delivery (Final Focus & Collimation)Damping RingsDecelerator + Linacs

CLIC Team MAD-X Day, September 4, 2003

Top Ten MAD modules

TWISSMATCHINGSURVEYTRACKEMITDYNAP IBSEFIELDEALIGNCORRECT

CLIC Team MAD-X Day, September 4, 2003

CTF-3 Prelim. Phase Linac (F. Tecker)

CTF3 Preliminary Phase Linac. Lattice was optimized with MAD8.The acceleration is modelled by LCAVITY elements and extends from4 to 350 MeV.

CLIC Team MAD-X Day, September 4, 2003

Design of CTF-3 Combiner Rings

see the Talk by C. Milardi

CLIC Team MAD-X Day, September 4, 2003

CLIC IP Beam (S. Redaelli)

Tracking through CLIC Beam Delivery at 3 TeV. MAD8 simulations include finite energy spread & synchrotron radiation.

CLIC Team MAD-X Day, September 4, 2003

CERN-DESY-SLAC Code Comparison for the CLIC IP Beam (S. Redaelli)

Without SR, MAD8 Y spot size is much larger than inMERLIN, PLACET and DIMAD. May PTC help!?

CLIC Team MAD-X Day, September 4, 2003

Design of Bunch Compressor Chicanes for the CLIC Main Beam (T. d’Amico)

matching & surveytracking (with wake fields & CSR desirable)

CLIC Team MAD-X Day, September 4, 2003

Design of CLIC Drive-Beam Turn Around (T. d’Amico)

optics matching & survey with MAD8

CLIC Team MAD-X Day, September 4, 2003

CLIC Damping Ring (M. Korostelev)

lattice

damping time & equil. emittance

CLIC Team MAD-X Day, September 4, 2003

IBS & DA Calculations for CLIC DR (M. Korostelev)

emittance time evolution

dynamic aperture

lattice matching

CLIC Team MAD-X Day, September 4, 2003

Damping Ring Design fully relies on MAD!

Optics designRadiation dampingEmittance evolution with IBSTracking for Dynamic ApertureResonance Compensation and NonlinearAnalysis for DA OptimizationError & Tolerance AnalysisClosed-orbit correctionsOptics corrections, emittance tuning, etc.

(M. Korostelev)

CLIC Team MAD-X Day, September 4, 2003

CLIC Beam Delivery with Collimation & Raimondi-Seryi Final Focus (T. Risselada, F. Zimmermann)

CLIC Team MAD-X Day, September 4, 2003

CLIC Luminosity Performance (S. Redaelli, D. Schulte, F. Zimmermann)

CLIC Team MAD-X Day, September 4, 2003

CLIC Beam Delivery Footprints (F. Zimmermann)

CLIC Team MAD-X Day, September 4, 2003

Prototype Compact Final Focus for CTF-3 (F. Zimmermann)

CLIC Team MAD-X Day, September 4, 2003

Nonlinear Collimation System (A. Faus-Golfe, F. Z.)

RMAT & GLOBAL (formula) for matching[also needed for nonlinear SPS optics (A. F.-G.)]

CLIC Team MAD-X Day, September 4, 2003

MAD is important for CLIC

In the past, the design and on-line models of all components for CTF-3 and for the 3-TeV CLIC design have relied heavily on MAD8. We would like to have at least the MAD8 functionality maintained in MAD-X. This is not yet completely the case. Certain extensions would be welcome and are encouraged!

CLIC Team MAD-X Day, September 4, 2003

MADX’ Positive Features:

• IBS is working fine

• Closed orbit correction considerably improved

• PTC will hopefully facilitate tracking and might aid in nonlinear optimization for DR and BDS

CLIC Team MAD-X Day, September 4, 2003

The Scope of PTC?

• identify the main nonlinearities blowing up the IP spot size and facilitate their correction for the beam delivery system,

• identify the main nonlinearities blowing up the transverse emittances in the damping rings, combiner rings & bunch compressors, and again provide methods to correct them

Our wish is to

CLIC Team MAD-X Day, September 4, 2003

Some Urgent MAD-X Problems

L-Cavity does not work with Twiss[needed for optics matching of all linacsincluding CTF-3 linac]; would like tore-establish late MAD8 functionality!

Dipole end faces with Twiss cause discontinuity in beta function at dipole exit[for design of damping rings]; only a plotting problem?

CLIC Team MAD-X Day, September 4, 2003

Plot of Damping-Ring Cell Optics (M. Korostelev)

MAD8 MAD-X

splineoption

withoutsplineoption

bizzar discontinuities

CLIC Team MAD-X Day, September 4, 2003

More Urgent MAD-X Problems

RMAT & TMAT not working?[needed for any transfer line matching]re-establish late MAD8 functionality! GLOBAL not working.[needed for many matching applications]re-establish late MAD8 functionality!

CLIC Team MAD-X Day, September 4, 2003

Many problems require specific tracking features, e.g., coherent synchrotron radiation, collimator wake fields, linac wakes, gas scattering, or collimator scattering. Another important group of beam-dynamics studies need integrated simulations including various beam-line segments, e.g., simulations from the Damping Ring to the IP. Specialized codes exist, e.g., for the beam-beam collision (GUINEA-PIG) or for multi-bunch linac tracking (PLACET).

CLIC Special Requirements

CLIC Team MAD-X Day, September 4, 2003

Data-exchange interface to allow fast data piping to and from user programs.

For example, enabling user-defined coordinate transformations by external program for selected element classes.

Suggested Extension

It is unrealistic to believe that MAD-X module keepers or the MAD-X custodian will cover every possibility. Neitherdo we want to write our own MAD program for each study.

CLIC Team MAD-X Day, September 4, 2003

ConclusionsMAD8 is a valuable tool for CLIC studies. We expect MAD-X to follow this tradition and not to lose the contact to the lepton machines. We hope that a few minor requirements (LCAV, dipole end faces, RMAT,GLOBAL) can be resolved quickly. A communication interface for tracking will greatly enhance the reach of MAD-X simulations for CLIC. Popular user-written programs could later become integrated into the MAD-X core.

LHC will profit from such a feature as well!

CLIC Team MAD-X Day, September 4, 2003

Thanks to all members of the CLIC team!

H. Braun, T. d’Amico, R. Corsini, A. Faus-Golfe, M. Korostelev, S. Redaelli, D. Schulte, and F. Tecker

helped preparing this presentation.