Latest news about GPT: On
this page you can find the latest developments in the GPT project. For
example new elements, bugs, update information and other recent developments.
Please use the form below to stay informed about the status of the GPT
project.
Known bugs and fixes for GPT
version 3.0
Information about previous GPT releases can be found by
clicking on the appropriate button in the left toolbar.
New elements and features can be found here.
04-Jun-09: Compiling custom GPT elements with the old Visual Studio
2005 gives 'Fatal Error LNK1103: debugging information corrupt'. This
problem is due to a known compatibility issue between Visual Studio 2005 and
2008. To solve the problem, please use either Visual Studio 2008, or install
the hotfix provided by
Microsoft.
04-Jun-09: Compiling 64-bit custom GPT elements is impossible
with the free Express edition of Microsoft Visual C++ because it does not
contain the required 64-bit compiler. You need to purchase the Education or
Standard version for this functionality. This problem does not apply to the
32-bit versions.
Known bugs and fixes for GPT
version 2.8
Information about previous GPT releases can be found by
clicking on the appropriate button in the left toolbar.
New elements and features can be found here.
25-Feb-09: The setfile keyword erroneously produces a 'multiple
occurrences of group X' error when reading particle coordinates
from a GPT outputfile that contains both position (screen) and time
(tout) output. To read stored coordinates at a specific simulation
time from such a file, please use the following workaround:
position = 1e100 ; # Any bogus number will work
time = desired_time ;
setfile("beam","output_of_previous_run.gdf") ;
05-Feb-09: There is an error in the randomize(seed) function of GPT
versions 2.7, 2.8 and 3.0: In the case of random initial coordinates
(created with the ~ modifier in the set...dist
keywords) a few coordinates are always created regardless of the
seed. To create independent random distributions for each
different value of the seed, please specify a negative seed.
01-Jan-09: To add custom GPT elements with Microsoft Vista, please
run GPTwin with Administrative permissions (shift-right-click on General
Particle Tracer in the Start Menu, and select Run As Administrator).
03-Sep-08: Under some circumstances the
FISH2GDF utility program of GPT versions 2.7 and 2.8
erroneously produces the error message: 'Can not find 6
array units'. An updated version for MS-Windows can be downloaded
here.
27-May-08: The
GDFTRANS utility program of GPT version 2.8 transposes
large GDF files very inefficiently. An efficient 32-bit
GDFTRANS
executable for MS-Windows can be downloaded
here. Efficient 32 and 64-bit
GDFTRANS
executables for Linux can be downloaded
here.
21-May-08: The Microsoft Visual C++ 2005 Express Edition is not
available for download anymore. To add custom GPT-Elements or GDFA-Programs,
please install the
Visual C++ 2008 Express Edition and see the next message.
21-May-08: The Microsoft Visual C++ 2008 Express Edition, the
replacement for the 2005 version, is not automatically recognized by GPTwin
version 2.81 and lower. This results in the following error message: 'cl'
is not recognized as an internal or external command. To add custom GPT-Elements
using the new
2008
compiler, the following setting in GPTwin needs to be modified:
Edit menu/Settings.../Compiler Batch file: C:\Program files
(x86)\Microsoft Visual Studio 9.0\VC\vcvarsall.bat
18-Oct-07: Adding custom elements to the Linux version of GPT
version 2.80 on a 64-bit machine produces linker errors. To solve
this problem, please add
TARGET_ARCH = -m32 to the ~/gpt/makeinc.gcc
file and recompile your custom element.
25-Jul-07: There are problems running GPT under Windows Vista:
Starting GPT results in an "Error creating new
process", and the on-line help doesn't display.
These problems are present in GPT releases 2.5x, 2.6x, 2.7x and 2.80.
They are corrected in GPT version 2.81.
02-Apr-07: Setting the radius of macro particles, for example with the
setrmacrodist keyword, works for every value except zero. If a
radius of zero is specified, or if no value is specified, the code
switches to the undocumented default value of 1 micron.
This error is present in GPT releases 2.5x, 2.6x, 2.7x and 2.80. If a radius of zero is
required, please set an unphysical small radius. For example:
setrmacrodist("beam","u",1e-100,0) ;
New
elements and features for GPT
version 2.8
1-July-09: Inspired by the EPAC2008 contribution of Ivan V. Bazarov and
Tsukasa Miyajima titled “Calculation of coherent synchrotron radiation
in General Particle Tracer” we present a version of the
spacecharge3Dmesh element that solves Poissons’ equation in a frame
that is aligned with the particle bunch. This additional rotation
significantly speeds up convergence in cases where the primary axes of
the bunch, as measured in the co-moving frame, are not aligned with the
Cartesian axes used in the tracking. The main use of this new element is
spacecharge calculations inside bend magnets. To obtain this new
spacecharge3Dmesh, please contact us by email at 'info at pulsar dot
nl'.
07-Nov-08: A new GDFsolve option has been implemented that can be used for
'matching with space-charge', 'global autophasing' and other non-linear
optimization problems. Documentation and an MS-Windows executable can be
downloaded
here. Please contact us for
Linux versions.
03-Oct-08: A new element has been developed that models the fields
of an idealized cylindrically symmetric cavity in TM110
mode. The new TM110cylcavity element can be downloaded
here.
23-Nov-06: To aid the design of Ultrafast Electron Diffraction (UED)
experiments with GPT we developed analysis routines to calculate the
coherence length of a charged particle beam. Documentation and
installation instructions can be downloaded
here.
Update policy: It is
our policy to introduce new features in the current release of GPT for free. However, when
they are included in a new release, typically within half a year, they are removed from
the free-elements list. Bug fixes for older versions remain available.
This page was last modified
04 februari 2010.
