Standard beamviewer (EBV: ESRF Beam Viewer)

Screenshot

see also: http://wikiserv.esrf.fr/bliss/index.php/Bvb

These beamviewers visualise the various types of x-ray beam (white, pink and monochromatic) into the visible spectrum, using a scintillator, a camera and associated software to provide the beam shape and relative power intensities. The maximum accommodated beam size (or potential beam movement) is 10mm x 10mm for the standard beamviewers.

ESRF “Standards” beamviewers (EBV) are composed by:

  • a Control Box (ISG made)
  • a fixed giga-ethernet basler camera+lens
    • powered by the Control box
  • an extractable head that can be moved in or out of the beam (called screen)
    • pneumatic-mounted mirror+scintillator
    • scintillator
      • diamond for white beam
      • YAG for monochromatic beam
      • Energy dependent for pink beam
  • a diode read by novelec module providing an output in frequency.
  • a LED that can be swiched ON and OFF.
  • optionnaly a foil to attenuate beam (on MX beamlines)

Usage

Usage of an EBV is described here: Beamviewer Usage.

Control

Control is implemented using 2 bliss objects:

  • EBV bliss object controls the wago box (screen, led, foil, diode)
  • LIMA bliss object controls the basler camera and the associated BPM counters computed on images

Wagobox modules:

Two type of wago box exist:

  • 1-EBV wagobox able to control only one EBV :

    • 750-436 : 8-channel digital input; 24VDC
    • 750-530 : 8-channel digital output; 24 VDC; 0.5 A
    • 750-479 : 2-channel analog input module (ADC)

  • 2-EBV wagobox able to control up to 2 EBV:

    • 750-436 : 8-channel digital input; 24VDC
    • 750-530 : 8-channel digital output; 24 VDC; 0.5 A
    • 750-530 : 8-channel digital output; 24 VDC; 0.5 A
    • 750-479 : 2-channel analog input module (ADC)

If the EBV has a foil to attenuate beam (MX case), two additionnal wago modules are added:

  • 750-436 : 8-channel digital input; 24VDC
  • 750-504 : 4 Channel Digital Output

Configuration

Configuration example

plugin: bliss                 (mandatory)
name: mywbv                   (mandatory)
class: EBV                    (mandatory)
modbustcp:                    (mandatory)
    url: wcidxxa              (mandatory)
single_model: False
has_foil: False
channel: 0
counter_name: mydiode

modbustcp / url defines the wago control box host as in standard wago controller.

Configuration optionnal parameters

  • single_model

    • default value : False
    • define which model of wago is used : if single_model is True, the wago box is a 1-EBV model otherwise it is 2-EBV model. Note that some 2-EVB models can be installed even if it controls only one BVB.

  • has_foil

    • default value : False
    • define if a foil attenuator can be controlled or not

  • channel

    • default value : 0
    • in case of a 2-EBV wago box model, defines which EBV is used : 1st one or 2nd one.

  • counter_name

    • default value : diode
    • counter name of diode current reading when EBV is used in counts/scans