Reconciled with block: tega_atmos R____

Objectives:

Power on and acquire an EGA atmospheric sample. This procedure is for the first, pristine atmosphere sample and is aimed at getting our best possible data on H2O (18O/16O and D/H). It has no cal gas analysis and no outgassing of the TA manifold. A large part of the run is done entirely on high emission. We have 60 minutes to measure the background and 90 minutes to measure the atmosphere. At the end we have 20 minutes on low emission to watch the effect of count rates losses on the mass-44 peak. We will first take an atmosphere sample via the TA Sample inlet so that we can measure mass 44. (The count rate of mass 44 is too high using the atmosphere inlet and high emission to permit analysis.)

Configuration:

First Surface Phase Sample will have been delivered to TEGA. However, no ramps will have been run on the sample until this activity is complete.

Constraints:

Review data from Checkout II to confirm dN numbers for regulation for in activity block and ramp segments.

Review data from Surface Phase Cover Retract Ion Pump to verify residuals are low enough to run instrument modes on HIGH emission

Gas(es) used: Mars ATM will also be collected through the ATM Sample valve.

Filaments used: 1

SW Version (386): V513 SW Version (EGA): V321

Sweep and hop mode version(s): MODE TABLE V117.

Super modes and Sweep modes used: Supermodes 1, 2, 3, 4, 5 and 10; Sweeps 37 and 38.

Note: TEGA is checked to see if TEGA is safed. If so, abort self to end activity

    1. Turn ON TEGA – Call TEGA_power_on
    2. 1.1.1. TEGA_MAIN1_PWR "ON"
    3. 1.1.2. TEGA_MAIN2_PWR "ON"
    4. 1.1.3. TEGA_MAIN3_PWR "ON"
    5. 1.1.4. Start the TEGA 386 FSW
  1. Pause 3 Minutes (collect engineering data at a high rate before turning down)
  2. Call Sequence 30A
    1. Turn on EGA
    2. 4.1.1. TEGA/FSW:EGA:Change EGA State
    3. 4.1.2. Restore the modes from EEPROM 0
    4. 4.1.3. EGA Commands:Restore Mode
  3. OPEN GEC Vent Valve
  4. Start Heater Regulation EGA Manifold -20C
  5. Start Heater Regulation TA Manifold -20C
  6. Warmup EGA: CALL tega_ega_emission_warmup

8.1. Calls tega_ega_prep, filament 1-8.1.1.1.Sets JPlate 0 to -110V 8.1.1.2.Sets Jplate 1 to -92V8.1.1.3.Start SM 1 pause 1 sec 8.1.1.4.Set MV 2800V Pause 1 sec8.1.1.5.Ion Pump ON Pause 1 sec8.1.1.6.Emission ON8.1.1.7.Pause 2 Minutes8.1.1.8.Stop SM 1

8.2. Change Emission Current to HIGH – PASS IN PARAMETER

8.3. Change calibration OFFSET

8.4. Wait 1 minute

8.5. Start SM 3

8.6. Pause 20 minutes

8.7. Stop SM 3

8.8. Pause 1 minute

8.9. Calls tega_ega_gain

8.9.1.1.1. Start SM 2

8.9.1.1.2. Pause 1 minute

8.9.1.1.3. Set MV 2600 – 3400V (1 minute per voltage)

8.9.1.1.4. Remain at 3200V

8.9.1.1.5. Stop SM 2

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June 2, 2008 TEGA_Pristine_Atmosphere_v4.doc

TEGA Pristine Atmosphere Procedure

8.9.1.1.6. Run Sweep 38

EGA is warmed up and ready to go (54 mins)

9. Call tega_ega_calibration_scans (Set =1, exit = 3200V)

Begin background determination

  1. Start SM 5 (Atmosphere HIGH Emission)
  2. Pause 60 minutes (time is to be tweakable)
  3. Stop SM 5
  4. Call tega_ega_calibrations_scans (Set 1, Exit = 3200V)
  5. Start SM 10 (Atmosphere; No H2O)
  6. Pause 5 minutes (to get residual data on new calibration

Do a quick measurement of the atmosphere via the TA Sample inlet to get mass 44 on scale.

  1. Open TA sample inlet
  2. Pause 5 minutes
  3. Close TA sample inlet
  4. Stop SM 10
  5. Start SM 5 (Atmosphere HIGH Emission)
  6. Open ATM Aker Valve
  7. 22. Pause 70 minutes (5400 Secs)
  8. Stop SM 5
  9. Change to LOW Emission
  10. Change calibration OFFSET
  11. Start SM 4 (ATM Low emission)
  12. Pause 2 minutes
  13. Stop SM 4
  14. Call tega_ega_calibrations_scans (set 3, emission low)
  15. Start SM 4 (ATM, Low emission)
  16. Pause 2 minutes
  17. Stop SM 4

Take a full sweep of the atmosphere composition

  1. Run Sweep 38
  2. Start SM 4 (ATM, Low Emission)
  3. Close ATM Valve
  4. Close GEC Vent Valve
  5. Pause 10 minutes (to watch decay of gas in atmosphere CML volume)

Flush atmosphere from Sample CML volume.

  1. Set Carrier gas to regulate at 35 mbar (3500 dn)
  2. Pause 10 minutes (to watch increase in N2 in TA CML volume)
    1. Turn Off Heaters: Call tega_disable_heater_control
    2. 40.1. Only heaters that will have been regulating are TA Manifold and EGA Manifold
  3. Stop regulation of Carrier gas
  4. Stop SM 4
  5. Close Sample
  6. Close Bypass
  7. Close ATM sample valve

45.1. Take a dump to confirm closed

Shut down

    1. Turn off EGA: CALL tega_ega_off
    2. 46.1.1.1. EGA Shutdown:
    3. 46.1.2. Multiplier Voltage OFF
    4. 46.1.3. Wait 5 secs
    5. 46.1.4. Emission Off
    6. 46.1.5. Wait 5 secs
    7. 46.1.6. Ion Pump Control OFF
    8. 46.1.7. Activate Sequence 7A to turn the EGA OFF
  1. Turn off TEGA: CALL tega_power_off

47.1.1. Turn off the third TEGA switch

47.1.2. Turn off the second TEGA switch

47.1.3. Turn off the first TEGA switch

47.1.4. FPGA Dump – Aker Valve state