Dexela camera plugin¶
The Dexela detector is a brand product of PerkinElmer. PerkinElmer has recently Acquired Dexela Limited a manufacturer of CMOS flat panel. Nevertheless the Dexela detector SDK still remains not compatible with the other PerkinElmer detector SDK (see perkinelemer plugin) and one need to use this camera plugin instead.
The Dexela detector model sensor2923 only has been tested at ESRF.
The detector is controlled via an acquisition board: PIXCI(R) E4 PCIExpress Camera Link board (EPIX,Inc.).
You need to install the acquisition card SDK. It was tested with 3.8 version (xclib). You can find them at http://www.epixinc.com/support/files.php .
You also need to install libdexela which is not yet GPL. See detail with firstname.lastname@example.org.
You should disable all power saving mode like CSTATE and disable also multiple-threading feature of cpu.
At ESRF, SuperMicro computers have to be configured like this:
Simultaneous Multi-threading has to be disabled
C1E support has to be disabled
Intel CSTATE Tech has to be disabled
Linux kernel configuration¶
As the PIXCI acquisition card needs a low jitters configuration, you need to change some kernel parameters.
To do so, you have to change in grub configuration file (under
/etc/default/grub for debian) the
by adding theses options:
pcie_aspm=off intel_idle.max_cstate=0 processor.max_cstate=0 idle=poll mce=ignore_ce ipmi_si.force_kipmi=0 nmi_watchdog=0 noht nosoftlockup isolcpus=0
the whole line should look something like this:
GRUB_CMDLINE_LINUX_DEFAULT="ipv6.disable=1 quiet pcie_aspm=off intel_idle.max_cstate=0 processor.max_cstate=0 idle=poll mce=ignore_ce ipmi_si.force_kipmi=0 nmi_watchdog=0 noht nosoftlockup isolcpus=0"
You also have to uninstall or disable the irqbalance process. On Debian you can simply type:
sudo apt-get purge irqbalance
Installation & Module configuration¶
Follow the generic instructions in Build and Install. If using CMake directly, add the following flag:
For the Tango server installation, refers to PyTango Device Server.
Initialization and Capabilities¶
Implementing a new plugin for new detector is driven by the LIMA framework but the developer has some freedoms to choose which standard and specific features will be made available. This section is supposed to give you the correct information regarding how the camera is exported within the LIMA framework.
The camera will be initialized within the
The parameter to pass to
DexelaInterface() constructor is the fill path need for the acquisition card.
This file is generated by xcap software provided by PIXCI. you can find some example in the config directory.
This plugin has been implemented in respect of the mandatory capabilites but with limitations according due to the detector specific features and with some programmer’s choices. We do not explain here the standard Lima capabilites but you can find in this section the useful information on the Dexela specfic features.
The Dexela detector as a pixel size of 74.8e-6 m (74.8 um) and the image data type is fixed to 16bpp (bit per pixel).
The supported trigger modes are IntTrig, IntTrigMult, ExtTrigMult and ExtGate.
The exposure time range is 0.0116 (1/86) to 120 seconds.
The latency time is not manage.
In addition to the standard capabilities, we make the choice to implement some optional capabilities in order to have an improved simulation.
There is no shutter capability.
There is no hardware capability, but Lima provides the sofware Roi as well.
The supported hardware binning factors are 1x1, 2x2, and 4x4.
How to use¶
The LimaCCDs tango server provides a complete interface to the dexela plugin so feel free to test.
For a quick test one can use python, is this a short code example:
from Lima import Dexela from lima import Core import time hwint = Dexela.Interface('./sensor2923.fmt') ct = Core.CtControl(hwint) acq = ct.acquisition() # setting new file parameters and autosaving mode saving=ct.saving() pars=saving.getParameters() pars.directory='/tmp/' pars.prefix='testdexela_' pars.suffix='.edf' pars.fileFormat=Core.CtSaving.EDF pars.savingMode=Core.CtSaving.AutoFrame saving.setParameters(pars) # now ask for 2 sec. exposure and 10 frames acq.setAcqExpoTime(2) acq.setNbImages(10) ct.prepareAcq() ct.startAcq() # wait for last image (#9) ready lastimg = ct.getStatus().ImageCounters.LastImageReady while lastimg !=9: time.sleep(1) lastimg = ct.getStatus().ImageCounters.LastImageReady # read the first image im0 = ct.ReadImage(0)