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Monochromator configuration parameters

Tango Server

The TANGO server stores the monochromator optical parameters which were last loaded. Those optimezed during commissioning in January 2016 are reported here for comparison and/or backup purpose.

  • Yen = -25.8 mm
  • Yex = 104.819 mm
  • Yex = 104.769 mm [until 08/07/2018]
  • Yex = 104.7 mm [until 14/7/2017]
  • Entrance Angle  = 0 rads
  • deltaMiOpt = -0.0002215 rads [current]
  • deltaMiOpt = -0.000194 rads [until 5/12/2016]
  • deltaGrOpt [VLS 400] = -0.0005737 rads [08/07/2018]
  • deltaGrOpt [VLS 400] = -0.0005637 rads [21/05/2018]
  • deltaGrOpt [VLS 400] = -0.0005817 rads [23/04/2018]
  • deltaGrOpt [VLS 400] = -0.0005637 rads [23/01/2018]
  • deltaGrOpt [VLS 400] = -0.0005737 rads [20/12/2017]
  • deltaGrOpt [VLS 400] = -0.0005677 rads
  • deltaGrOpt [VLS 400] = -0.00063 rads [5/12/2016]
  • deltaGrOpt [VLS 200] = -0.0012970  rads [21/05/2018]
  • deltaGrOpt [VLS 200] = -0.0013140 rads [23/04/2018]
  • deltaGrOpt [VLS 200] = -0.0012977 rads [20/12/2017]
  • deltaGrOpt [VLS 200] = -0.0012877 rads
  • deltaGrOpt [VLS 200] = -0.001354 rads [5/12/2016]
  • deltaGrOpt [SG10] = -0.00172200 rads 

Feedback control system

The monochromator energy can be stabilized by activating a software feedback on the Tango Server. The feedback has to be activated by yhe users and disables automatically when a command is sent to the "monch" server on Tango.\

  • Period: this value is set by opening Jive and selecting Nanosp/Monoch/Monoch/Polling; the variable EnergyFeedbackStatus has to be selected and set to the desired value. Current default is 10000 ms. To enable click on the "Apply" button.
  • Energy Feedback band: mirror and grating are moved only if the difference between the set and measured energy is larger than this value. Current default is 10 meV

Back to Nanospectroscopy manuals.

Piezo controller

The piezoelectric actuators for fine roll alignement of the monochromator grating roll are powered by dedicated amplifiers, which areremotely controlled by DAC. The optimum voltages are reported here.

  • Channel 1 [VLS 200] = 5.50 V [last checked on 14/07/2017]
  • Channel 2 [VLS 400] = 5.05 V [last checked on 14/04/2017]
Ultima modifica il Domenica, 08 Luglio 2018 17:36