Merge branch 'master' of git.ucc.asn.au:/matches/honours

[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 cfc44f6..50095d8 100644 (file)
--- a/research/TCS/2012-09-10/readme
+++ b/research/TCS/2012-09-10/readme
@@ -27,6 +27,10 @@ And comparison between first curve at optimum potentials on 2012-09-07 and last
 Noted significant difference, not just in maximum value, but in shape of curve...
 Compare TCS as well.
 
 Noted significant difference, not just in maximum value, but in shape of curve...
 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 (a day) taken to do a single cycle
+

 Plan:
 
 - Take control measurements of current sample
 Plan:
 
 - Take control measurements of current sample


@@ -60,5 +64,31 @@ Vv = 23.2V
 Still looks wrong, as good as I am going to get.
 I hate this experiment.
 
 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.