de Maria, R.

Paper	Title	Page
WEPPP12	New Developments of MAD-X UsingPTC	209
	P. K. Skowronski, F. Schmidt, R. de Maria CERN, Geneva E. Forest KEK, Ibaraki
	For the last few years the MAD-X program makes use of the Polymorphic Tracking Code (PTC) to perform calculations related to beam dynamics in the nonlinear regime. This solution has provided an powerful tool with a friendly and comfortable user interface. Its apparent success has generated a demand for further extensions. We present the newest features developed to fulfill in particular the needs of the Compact LInear Collider (CLIC) studies. A traveling wave cavity element has been implemented that enables simulations of accelerating lines. An important new feature is the extension of the matching module to allow fitting of non-linear parameters to any order. Moreover, calculations can be performed with parameter dependence defined in the MAD-X input. In addition the user can access the PTC routines for the placement of a magnet with arbitrary position and orientation. This facilitates the design of non-standard lattices. Lastly, for the three dimensional visualization of lattices, tracked rays in global coordinates and beam envelopes are now available.
WEPPP14	Advances in Matching with MAD-X.	213
	R. de Maria, F. Schmidt, P. K. Skowronski CERN, Geneva
	A new matching algorithm and a new matching mode have been developped for MadX in order to increase its potentialities. The new algorithm (JACOBIAN) is able to solve a generalized matching problem with an arbitrary number of variables and constraints, aiming to solve the corresponding least square problem. The new mode (USE\MACRO) allows the user to construct his own macros and expressions for the definition of the constraints. The new algorithm and the new mode where succesfully used for finding optic transitions, tunability charts and non-linear chromaticity correction. They can be used as a general tool for solving inverse problems which can be defined in MadX using all the available modules (twiss, ptc,track, survey, aperture, etc).
WEA4IS03	2-D Electromagnetic Model of Fast-Ramping Superconducting Magnets	283
	B. Auchmann, S. Russenschuck, R. de Maria CERN, Geneva S. Kurz Robert Bosch GmbH, Frankfurt
	The simulation of pulsed superconducting magnets has gained importance at the verge of fast-ramping cyclotron projects. The ROXIE program has been devised for the design and optimization of superconducting magnets. The 2-D electromagnetic model of a fast-ramping magnet in ROXIE consists of a representation of strands by line currents, a coupling of the finite element method and the boundary element method to take into account the field contribution of the magnet yoke, as well as eddy-current effects in conductive bulk material, a model for persistent currents, a model for inter-filament coupling currents, and a model for inter-strand coupling currents in Rutherford-type cables. We will present the coupling of all these effects in the mathematical framework of the theory of discrete electromagnetism. We will then proceed to demonstrate how the coupled approach helps to understand a pulsed magnet's behavior. Each of the above effects leaves an identifiable signature in the measured field quality and contributes to the losses. With ROXIE, we can trace measurements to their origin and make predictions based on experience and simulation.
	Slides