GSFC IMS Prototype Calibration Plots
Sent by Mike Shappirio on 1 Oct. 2003
  • He
  • "Old foils" data
    • count rate in start channel: not recorded
    • chamber pressure: ~3 * 10^-7 Torr
    • TDC setup: Standard (if you would like to know specifics, email M.S.)
  • "New foils" data
    • count rate in start channel: ~100
    • chamber pressure: ~6 * 10^-7 Torr
    • TDC setup: Standard (if you would like to know specifics, email M.S.)
For He, the data is pretty consistent between the "Old" and "New" foils. The two most noticable differences is the amount of signal seen around TOF 169 in the "New" foil data (possibly from adsorbates on the foils being sputtered off?) and relitively more counts in the He peaks for the second hits data (most likely due to the high number of counts at short TOFs).
None of these peaks have been fit yet. All the above is "by eye" and the data should be looked at more closely.
 
  • Ne
  • "Old foils" data
    • count rate in start channel: not recorded, but probably high (>200)
    • chamber pressure: ~3 * 10^-7 Torr
    • TDC setup: Standard (if you would like to know specifics, email M.S.)
  • "New foils" data
    • count rate in start channel: ~100
    • chamber pressure: ~6 * 10^-7 Torr
    • TDC setup: Standard (if you would like to know specifics, let me know)
In addition to the differences observed in the He data, the "old" data files have a higher background level (probably due to a high count rate) and their seems to be a slight shift in the center of the peaks.
None of these peaks have been fit yet. All the above is "by eye" and the data should be looked at more closely.