Atmos Wiki

* Run 05: SMPS_20220315_Run05

• No notes on this run.

* Run 06: SMPS_20220315_Run06

• Start Time: 14:24 UTC
• CPC Starting Concentration: 6300 #/cm3
• APS Starting Pattern: Flat. Minor peaks around 3-4 μm at 4 #/cm3
• CPC continuing to linearly drop off

* Run 07: SMPS_20220315_Run07

• Start Time: 14:59 UTC
• CPC Starting Concentration: 2800 #/cm3
• APS Starting Pattern: Relatively Flat
• CPC Concentration after 5 min: 2000 #/cm3
• Any minor APS peaks are around 5 #/cm3
• CPC showing asymptotic behavior, signs of flattening out.
• Tapping valves causes spikes in CPC concentrations.

* Run 08: SMPS_20220315_Run08

• Start Time: 15:28 UTC
• Filter Off: 16:12 UTC
• CPC pattern very different. CPC concentrations increased and now relatively stable. Different solution producing different results. CPC concentration stabilized around 380 #/cm3.
• APS Pattern: Flat
• After peak, seeing slight decay in concentration.

* Run 09: SMPS_20220315_Run09 (Acetone Run)

• Start Time: 16:25 UTC
• Purge of Generator: 16:29 UTC
• Peak of purge at 100 #/cm3. Falling off quickly.
• Second peak observed at 16:37 UTC. Unknown what the cause is.
• Filter Start Time: 16:41 UTC
• Back to background levels after purge at 16:44 UTC.
• Train went by at 16:51 UTC. No response in data.
• Tapping valves at 16:54 UTC. Minor peak of 40 #/cm3.

* Run 10: SMPS_20220315_Run10 (Propane Run)

• Start Time: 18:08 UTC
• Filter On: 18:09 UTC
• CPC just background values ( ≥ 0.5 #/cm3).
• APS has very few larger particles. Peak around 0.6 μm at ∼0.2 #/cm3.
• 10 mins in, everything remains the same. APS peaking between 0.6-0.7 μm.

* Run 11: SMPS_20220315_Run11 (IPC 2021 Old Run)

• Start Time: 19:01 UTC
• CPC Concentration Peak: ∼440 #/cm3
• APS Pattern: Flat, no real peaks
• CPC showing linear decrease. ∼350 #/cm3 at 5 mins in.

* Run 12: SMPS_20220315_Run12 (New Filtration System: Duplicate to Run 1)

• Filtration System added: 0.2 #/cm3 background
• CPC hovering around 20,000 with valves open. Counts averaged around 17,000 #/cm3. Background is 0.1-0.3 #/cm3.
• Background 1 to Atmos. 15,000 ratio
• CPC Start Time: 20:05 UTC
• Sample Start Time: 20:30 UTC
• 1 minute sample outside (air without dilution)
• 1 minute sample with dilution
• Repeat process for two of each.
• Generator CPC peak at 1,100 #/cm3. Dropping linearly to 750 #/cm3 3 minutes later.
• CPC holding steady between 700-750 #/cm3.

* Run 13: SMPS_20220315_Run13 (WMI Formula)

• CPC Start Time: 20:55 UTC
• Initial Concentration: ∼20 #/cm3
• Ratio Tests:
  • 13-15 background to 40,000 (1 valve)
  • 13-15 background to 80,000+ (all valves)
• Concentrations not dipping down to previous background levels. Some contamination possible. Another bypass might be needed.
• Running propane to clear 8“ tubing. No real response. Still 8-10 #/cm3. Needs to be around 1 #/cm3.
• More ratio tests:
  • 3-6 background to 14,000-15,000
  • 5-7 background to 12,000-13,000
  • 5-7 background to erroneous values.
• Sample Start Time: 22:10 UTC (same as filter start time)
• CPC Concentration: 3,720 #/cm3
• APS pattern: Continued relatively flat pattern ∼ 4 #/cm3
• Fans once again died at the end. (overheated)