Summary: Most of the morning was spent hooking up the
last few wires on the iron magnet, and figuring out which section of EM I’ll be
TA’ing for. In the afternoon, the pulsed
current supply for the fast magnet was fired while taking background spectral data
with the NaI detector. There was no recognizable
effect caused by firing the pulser.
If you're new to the experiment, please scroll to the bottom for background information.
Magnet Work
Spades were attached to the four wires of the three phase
power cord. These were in turn attached
to the magnet power supply.
The power supply case was grounded per the instructions
The chiller was turned on along with the coil cooling
supply, (the sink faucet). The flow of
the coil cooling supply was increased until the bucket/timer flow meter
indicated two gallons per minute. The position
of the cold water know with a flow of two gallons per minute is shown below.
When the chiller is operating, the flow meter for the power
supply should appear as follows.
The supply did not energize on the first attempt. The breaker was off. When the breaker was turned back on, the power
supply operated correctly.
Chiller alarms: The chiller occasionally sounds an
alarm. The typical fix is to increase
the water level in the chiller. This
procedure worked today.
Operational tests:
The magnet has been operated at currents up to five Amperes
for less than a minute.
Detector Work
Bias
|
1500 V
|
Gate Window
|
0.5 uS
|
Threshold
|
1.5mV
|
Attenuation
|
0 dB
|
Data set
|
HBC_00023
|
Source
|
3? Pulsed magnet shots
|
Start Time
|
2:55 PM
|
Stop Time
|
3:00 PM, (5:01 minutes:seconds)
verified on video |
Date
|
2014_08_20 – 2014_08_21
|
x-y scope V/div
|
1, 0.5
|
Shielded?
|
Yes
|
Tube
|
Harshaw B-
|
Background check
Bias
|
1500 V
|
Gate Window
|
0.5 uS
|
Threshold
|
1.5mV
|
Attenuation
|
0 dB
|
Data set
|
HBC_00024
|
Source
|
Background
|
Start Time
|
2:55 PM
|
Stop Time
|
3:00 PM, (5:33 minutes:seconds)
|
Date
|
2014_08_20 – 2014_08_21
|
x-y scope V/div
|
1, 0.5
|
Shielded?
|
Yes
|
Tube
|
Harshaw B-
|
The graph below shows no significant difference between the spectral
data gathered while the pulsed magnetic field was fired four times, and that
gathered with no pulsing of the magnet current supply.
Simulator Work
The simulator is back up and running. The following output is for a coil 1.6 cm in
diameter that would hold the small YBCO sample. The labels on the magnetic field plot are not correct. An issue has been filed on the simulator code.
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