Spectrometer

Argus

  1. Set the values in ~/Pychron/setupfiles/spectrometer/config.cfg

[General]
name = jan

[SourceParameters]
ionrepeller = 10.0
electronenergy = 40.20

[SourceOptics]
ysymmetry = 50.0
zsymmetry = 06.0
zfocus = 70.0
extractionlens = 01.0

[Deflections]
h2 = 0.0
h1 = 0.0
ax = 454.0
l1 = 0.0
l2 = 0.0
cdd = 0.0

[CDDParameters]
operatingvoltage = 618.0

[Protection]
use_detector_protection=True
detectors=CDD
detector_protection_threshold=0.1
use_beam_blank=False
beam_blank_threshold=0.1

  1. Set the ~/Pychron/setupfiles/spectrometer/mftable.csv. Each value in the table is the peak center in DAC space for a given isotope on a given detector.

    Note

    The DAC value is for a Deflection voltage=0

    To populate the table,

    1. Set the deflection to zero,

    2. Peak center Ar40 on H2

    3. Record the DAC value in the approriate cell

    4. Repeat 1-3 for Ar40 on H1,AX,…, etc

    5. Repeat 1-4 for Ar39,Ar36

  2. Setup the deflection correction files

    1. Create directory ~/Programming/Pychron/setupfiles/spectrometer/deflections

    2. For each detector create a text file using the detector name as the name of the file. e.g AX

      Note

      Use all capital letters and leave off the .txt extension

    3. The detector files are simple csv files where each row represents a deflection,dac pair. The dac value is the voltage required to center a reference isotope (Ar40) on this detector for a given deflection. For example the AX file might look like

      0,6.003672
135,5.99933

    Note

    you can add as many calibration points as you like, but in practice the deflection voltages do not change over time so you can just define two points, 1) deflection=0 and 2) deflection=<normal operating voltage>