Automatic commit. Tue Sep 11 00:00:04 WST 2012

[matches/honours.git] / research / TCS / 2012-09-10 / readme

diff --git a/research/TCS/2012-09-10/readme b/research/TCS/2012-09-10/readme
index 8858096..50095d8 100644 (file)
--- a/research/TCS/2012-09-10/readme
+++ b/research/TCS/2012-09-10/readme
@@ -29,7 +29,7 @@ Compare TCS as well.
 
 Talked to Sergey
  - Parameters aren't necessarily optimum (I know this), best way to optimise is with a cyclical adjustment (I did one cycle only)
- - Not much I can do to optimise further, due to time dependence of curves, and long time taken to do a single cycle
+ - Not much I can do to optimise further, due to time dependence of curves, and long time (a day) taken to do a single cycle
 
 Plan:
 
@@ -65,6 +65,30 @@ Still looks wrong, as good as I am going to get.
 I hate this experiment.
 
 Record pressure whilst evaporating.
+Pressure recording stopped several times, so my fix doesn't work properly. Will solve that problem later, it is minor.
 
+Make new sweeps. Maxed out ADC; had to adjust scale of 602 from 1e-6 x 0.1 to 1e-6 x 0.3. Increase in current related to sample, or different pressure of chamber (previously noted increase in current during evaporation, as pressure increased)?
+
+Note spread of TCS peak is much wider. Try to optimise by adjusting electrodes to maximise I when V = 2V.
+Current is lower, but spread of peak narrower.
+
+Evaporate black Au at 1.8e-1 to 2.1e-8 mbar. Aimed for 30 mins. But filament blew after 15min.
+Forgot to rotate sample holder before evaporating!!! FUCKING. GENIUS.
+Evaporated over empty sample holder instead of Shiny Au on Si. Dammit.
+
+1 filament left with Au on it, but haven't formed ball yet.
+Need to decrease pressure to e-6, form ball, repeat whole thing again. ARGH.
+
+Form ball at 4.5A 4e-6mbar.
+
+Now increase chamber pressure again. Evaporate 1.8e-1 to 3.0e-8mbar. The Au ball fell off the filament after ~5min. GARGH.
+
+Replace all three filaments, since no gold balls left.
+
+Recording pressure whilst chamber pumping down. Unfortunately, camera was mis-aligned, so many bad values. "1639.pressure.dat" has good values.
+Start preparing balls at 1.4e-5 mbar. Lost first ball at 4A. Lost second ball at 4A. Fuck them all. Third ball? Lost it at 3.5A. ARGH.
+
+Try again.
+Preparing balls at 1.0e-5 mbar. First ball formed at 4.1A, 8.78e-6mbar. Second ball formed at 3.5A 5.4e-6 mbar. Lost third ball 3.5A 4.7e-6 mbar. Going home 7:45pm.