add TRACY history

README

+##########################################################################
+TRACY, A Tool for Accelerator Design and Analysis EPAC'88
+
+Self-Consistent Symplectic Integrator for charged particle beam dynamics.
+
+The symplectic integrator for realistic modeling of magnetic lattices for
+ring-based synchrotrons was initially implemented in Pascal, by the author,
+with care taken for the software architecture and resulting records/modules
+(-> "objects") to reflect the structure of the mathematical objects describing
+the underlying beam dynamics model.
+
+
+The symplectic integrator for RADIA kick maps was implemented by Laurent
+Nadolski, SOLEIL, 2002.
+
+The original Pascal library/code was machine translated to C (with p2c) by
+Michael Boege, SLS, 1998.
+
+
+The TRACY code was written by J. Bengtsson, É. Forest, and H.
+Nishimura, then translated by M. Böge at SLS, extented by L. Nadolski at SOLEIL
+(2002), revised by J. Bengtsson at BNL (2005). A compact user interface was added at
+SOLEIL by J. Zhang (2011).
+
+J. Bengtsson, “TRACY-2 User’s Manual”, SLS
+J. Bengtsson, E. Forest, and H. Nishimura. Tracy3 User’s Manual.
+Internal Document, February 1997; M. Böge,
+“Update on TRACY-2 Documentation”, SLS Internal
+Note, SLS-TME-TA-1999-0002, June 1999 
+
+H. Nishimura. TRACY, A Tool for Accelerator Design and Analysis.
+Proceedings of 1988 European Particle Accelerator Conference, pp. 803-805, Rome,
+Italy, 1988
+
 ##########################################################################
 April 11th, 2011
 LNLS
@@ -37,6 +71,23 @@ this file can be put in your path to run the code from anywhere
 Example to test the code: 
 executable is soltracy located in  $TRACY_LIB/tools 
 
+#########################################################################
+TRACY HISTORY
+
+The underlying beam dynamics model is open source; courtesy Michael Böge.
+(A CORBA Based Distributed Client/Server Model for Beam Dynamics Applications at the SLS ICALEPS'99)
+
+J. Bengtsson implemented and coded Tracy-2 as a Pascal beam dynamics library in 1990 (having been a TA for ditto at the dept. of software engineering, Lund Inst. of Tech.); based on a 4th order symplectic integrator. While Michael's machine translation mangled the (Pascal data) record structure quite badly – my implementation was object oriented [implicitly; since Pascal does not support objects] – the software architecture enabled him to pull it off.
+
+Johan was tasked with providing an on-line model to guide the ALS commissioning. I.e., contrarily, Tracy was a 2x2 matrix code by Hiroshi Nishimura also coded in Pascal (TRACY, A Tool for Accelerator Design and Analysis EPAC'88); which was found to be inadequate for an on-line model (assuming e.g. mid-plane symmetry -> no linear coupling, etc.)
+
+Johan used it to guide the control of the nonlinear dynamics for the SLS conceptual design in the mid-1990s.
+(Having validated the model by beam studies for the ALS commissioning (& also provided a realistic estimate of the Touschek lifetime; for a medium energy ring): Modeling of Beam Dynamics and Comparison with Measurements for the Advanced Light Source (ALS) EPAC'94)
+
+After which M. Böge machine translated my beam dynamics library from Pascal to C (with GNU p2c) & used it as an on-line model server to guide the commissioning (i.e., including e.g. modeling of girder correlations, etc. & the related correction algorithms that I provided to model the real lattice for the SLS conceptual design).
+
+
+