changes

pic 模拟程序！面向对象

CHANGES to XOOPIC

XOOPIC 2.5-current --  Requires XGrafix version later than Mar. 29, 2005.

o	fixing routines converting particles' velocity into their
	energy and gamma to be correct in both relativistic and
	non-relativistic regimes
o	moving window added.
o	analytic initial fields added to Control
o	bugfix to plasma source
o	bugfix to exitport:  dump/restore stored the wrong fields.
o	changing the save file name in the GUI is now recognized
        by xoopic
o	dump file format changed to better support multiprocessing

XOOPIC 2.1

o	Secondary subgroup added to Dielectric, allowing most boundaries to 
	have multiple incident species unduce secondary emission.
o	Energy threshold added for secondary emission.
o	Freeze Fields.

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XOOPIC 2.0  8/20/97  --  Requires Xgrafix Ver. 2.4

o Equation parser/evaluator
o Timefunctions via evaluator
o Magnetic field via evaluator
o Load/PlasmaSource via evaluator
o Named variables in input file
o EM damping
o Dielectric triangular region
o Oblique equipotentials
o Dielectric::reflection
o equation parse for grid setup
o oblique beam emitter and var wt bm emitter
o supercycling (for low-space charge species which must be pushed 
  faster than electrostatic fields change due to particle Courant)
o MCC package flexibility improved; see gas.inp for example
o MCC package can handle multiple (noble) gases
o Input file format changed, for emitters, vzdrift -->  v1drift,
  and other variables similarly to better support multiple geometries.
  The following definitions where used to define the temperature:
	temperature: 3/2 kT = 1/2 m (Vtx^2+Vty^2+Vtz^2) = 1/2 m Vt^2
	v1thermal:  1/2 kT = 1/2 m Vtx^2	
	v2thermal:  1/2 kT = 1/2 m Vty^2
	v3thermal:  1/2 kT = 1/2 m Vtz^2
o Current Regions: given currents in regions and lines.
o Input file changed to allow multiple spatial regions
o Subgroups added
o Conductor, equipotential, polarizer, foil boundaries
  can be multi-segment.
o Multiple gas packages possible (see MCC in input.txt)


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XOOPIC 1.1  5/29/96  --  Requires Xgrafix Ver. 2.2

WARNING:  time function frequency for boundaries
changed from rad/s to Hz.

* bugfixes in the EM boundary conditions

* bugfixes to the Field Emitter boundary

* Rambo-Friedman EM damping of short wavelengths

* oblique conductors and equipotentials automatically stairstepped

* rectangular and triangular dielectric regions

* volume plasma source object added 

* Subcycling fields added  

* Enhanced diagnostics

* Secondaries improved, > 1 coefficient allowed

* Particle subcycling added.

* Misc. changes for wider cross-platform compatibility.

* Improved accuracy of field interpolation on the boundaries

* Normals for boundaries indicated on configuration space diagnostic

* spatially varying magnetic fields

* generic bug fixes.

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XOOPIC 1.00  9/18/95

Initially released version.