As I noted, the power supply variation I saw was due to the intrinsic
nature of variac design. I saw no variation of the heater coil
resistance other than that of the temperature coefficient of the Kanthal
A1 wire. Try setting a voltage with a variac under any constant load and
you'll see the same thing as the carbon brush heats up.
We'd like to have a CCI controller with constant power option for
ongoing MFMP tests. I got a quote from them of $2873 for a MicroFusion
3-phase 50 amp unit with all the options.
This test was to explore the sealing limits of Swagelok fittings on an
alumina tube, and no sealer was in the tube. Further tests with various
sealers are in progress.
AlanG
On 1/19/2015 10:45 AM, Axil Axil wrote:
Your power supply could be faulty. I sagest upgrading your power
supply until the power variations on calibration runs are eliminated.
You might try to use a fast response time pulsed voltage regulator.
Your data is only as good as your power supply.
On Mon, Jan 19, 2015 at 12:53 PM, AlanG <[email protected]
<mailto:[email protected]>> wrote:
I also saw temperature excursions during my sealing tests. The
swings I saw were as much as 20 degrees C at 1 second sampling
interval, with a period of 10-30 seconds. My tube contained only
air at 10 bar and 700 C, and no 'fuel', so I think these swings
are at least partially due to convection patterns and possibly
resonant pressure standing waves in the hot gas.
The heater power also wanders over a range of 1-2%, due to
instability of the variac carbon brush on the transformer wire.
The CCI Compact Fusion controller used in the Lugano test does
have an optional constant power control mode. Most phase-angle
controllers don't offer this option.
AlanG
On 1/18/2015 9:48 PM, Axil Axil wrote:
So sorry, please excuse me but I have developed an opinion.
These heater power failures are caused by the LENR reaction
and if not immediately countered, these power drops will delay
the onset of the LENR reaction. A 5 seconds response time to
counter is far to long a time delay to increase the current
flow to the heater. I don't believe that MFMP counters this
heater behavior at all since they have no constant power
circuit mechanism in their heater power supply. Like MFMP, the
Russian experimenter sees temperature variations of up to
100C. This is very primitive an unsophisticated
experimentally. A nanosecond might be enough of a response
time lag to counter the heat circuit current drop. This
unusual superconductor onset behavior is causing long startup
times for the onset of the LENR reaction. I hope that Brian
Ahern will develop constant power circuitry to add elegance to
his experiment to greatly increase the response time for the
onset of the LENR reaction and thereby increasing experiment
turnaround times.
