Arrive 09:50

Au on Si:
 - Compare sweeps this morning and last night
   - System only did 4 sweeps and stopped, because I forgot to replace "for i in range(0, 4)" with "while true"
     - Can still take sweeps this morning, but don't have the full slowly changing set
	  - FIRST: Fixed dodgy connection on ADC/DAC box. The initial energy appears more stable. DAC = 4000 corresponds to 16.98V.
	  - Previously DAC = 4000 corresponds to 15-16V, varied if I moved the cable. Now it is stable.

   - Current this morning ~1/3 of current yesterday
   - Chamber and gun values from 2012-09-12 (yesterday) at 18:28

# Chamber Pressure = 8.55e-08
# Venault Voltage = 10.55
# Accelerating Voltage = 185.3
# Focus Voltage = -20.7
# Deflection Voltage = 6.76
# Initial Voltage = sweep
# Heating Current = 1.135
# Heating Voltage (across filament) = 1.165
# Heating Voltage (across power supply) = 1.52

  - Electrode values from 2012-09-13 (today) at 10:06

# Chamber Pressure = 6.45e-08			( - 2.10e-8 )
# Venault Voltage = 10.58			( + 0.03 )
# Accelerating Voltage = 185.3  		( same )
# Focus Voltage = -20.7 			( same )
# Deflection Voltage = 6.76 			( same )
# Initial Voltage = sweep 
# Heating Current = 1.135			( same )
# Heating Voltage (across filament) = 1.155	( - 0.010 )
# Heating Voltage (across power supply) = 1.498 ( - 0.03 )

  - Very little change (except in chamber pressure)
  
  - Comparison of plots; generate by running "compare.plt"
    - Max current decreases over time. Decrease is significant in 2012-09-12 plots, small in 2012-09-13 plots. 
	- 2012-09-13 plots ~1/3 max level
    - Level of increase moved slightly to left in 2012-09-13 plots. 
	- This is probably because the ground levels of DAC and power supply are closer now.
    - Width of increase appears the same
    - Plateau is flatter in 2012-09-13 plots

- Take a few more sweeps, then prepare Black Au.
  - Hopefully will actually get it done this time.

  - Had to go to tutorial at 11:00, then had lunch... then QFT Tutorial... didn't get back until 14:08
    - Sweeps all appear similar, slight downward drift in maximum current
      - I really hope the filament doesn't die.

  - Prepare Black Au !
     - pressure monitored in 1408.pressure.dat every 5s
	- Evaporate at 3.1A - entire ball melts after 18mins
	
  - Decrease pressure; turn turbo pump back on. Pressure still in 1408.pressure.dat (pump turned on after t = ~2580s)
  - Turn on filament (2980s) monitor sample current with max initial energy, wait for stabilise, then take TCS
    - Or don't wait
      - Note shift in work function from ~500 to ~800 counts

  - Plan: 
     - Take TCS of Black Au 
     - Evaporate shiny Au on top
     - See if TCS returns to original form
     - Then vent chamber, turn off everything for electricians on Friday