--- /dev/null
+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.
+
git.ucc.asn.au / matches / honours.git / blobdiff
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