 Mon Jul 6 16:49:21 2020, Alex M, Daily Update
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Name
Update for Today
Plans for
Tomorrow
Alex M
Fixed up a few more errors in the new roulette algorithm with the length cut. Started
a run to test the loop. |
Thu Jul 2 23:13:05 2020, Amy , A useful reference on bicone antennas 
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I found this datasheet on bicone antennas, that is a useful reference for seeing the relationship between bicone dimensions and bandwidth. From
these it looks like the lower end of the band is at about f_low=c/(4*L_E), where L_E is the entire length of the antenna (twice the length of one cone),
although we'd expect the peak gain to be where a quarter wavelength is just one of the cones (and the figure may roughly support that). |
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Thu Jul 2 15:03:39 2020, Alex Patton, Daily Update 7/2/20
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Name
Today's Update
Plans for Tomorrow
Alex
M
Worked with Alex to change the roulette algorithm to implement a cut on the minimum length for the Antennas. Amy showed that we
don't want to generate antennas which are shorter than 37.5 cm in length (for each cone, so a total of 75 cm all together) because anything shorter |
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Wed Jul 1 16:18:35 2020, Alex M, Daily Update 7/1/20
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Name
Today's Update
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for Tomorrow
Alex M
Worked to make the frequency plots up to ~2.5 GHz. Amy said we should put a cut off for
the length of the antennas based on the minimum frequency, but right now I'm not sure how to find what that minimum length should be based on the frequency |
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Tue Jun 30 17:12:32 2020, Alex M, Daily Update 6/30/20
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Name
Update for Today
Plans for
Tomorrow
Alex M
Continued looking in XF for why the frequency where two antennas separated by a small amount
give the same gain. I made a script which plots the gain at each frequency for a chosen number of individuals at a specific polar angle and used it on |
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Mon Jun 29 15:57:41 2020, Alex Patton, Daily Update 6/29/20
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Name
Today's Update
Plans for Tomorrow
Alex
M
Worked with Alex P to look at the different gain patterns for antennas with different separation distances. We found that there wasn't
a clear frequency where they started to agree--looking at the average frequency gain plots we sent on slack, they look very different. We're trying |
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Fri Jun 26 16:13:18 2020, Alex M, Daily Update
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Name
Today's Update
Plans
for Monday
Alex M
Worked to run the loop with Alex P to test a smaller initial mean and standard deviation of
the opening angle. Worked some more on the paper too--I fixed some citations issues (and found some good ones to add) but the references are still spilling |
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Thu Jun 25 15:22:50 2020, Alex Patton, Daily Update 6/25/20
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Name
Today's Update
Plans for Tomorrow
Alex
M
Worked with Alex P on figuring out why we keep evolving towards small antennas. We think it's because the initial angle is so
large, and the standard deviation of makes it more difficult to bring the antenna within the confines of the hole by mutating the angle than by mutating |
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Tue Jun 23 14:37:07 2020, Alex Patton, Daily Update 6/23/20
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Name
Today's Update
Plans for Tomorrow
Alex
M
Worked with Aelx P on running the loop with decreasing grid spacing. I also worked in the XF GUI some more and figured out how to
make 3D gain plots (per Cade's suggestion) and tried comparing different grid sizes for a single antenna with proGrid on. |
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Mon Jun 22 13:52:32 2020, Alex Patton, Daily Update 6/22/20
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Name
Today's Update
Plans for Tomorrow
Alex
M
Worked with Alex to run XF with smaller grid spacing. We're down to 0.001 cm, but below that we were getting long times on the
XF GUI that made it seem like it was hanging. I also investigated XF from a Pitzer desktop to see how to use the progrid setting. I can get the scripts |
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Fri Jun 19 16:27:53 2020, Alex Machtay, Daily Update 6/19/20
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Name
Today's Update
Plans
for Monday
Alex M
Ran the loop with the same individuals in each "generation" to test how decreasing
the grid size would affect the effective volume. Using individuals with lengths of 5cm, I startde with a grid spacing of 0.01 cm and kept cutting down |
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Thu Jun 18 14:33:32 2020, Alex Patton, Daily Update 6/18/20
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Name
Update for Today
Plans for tomorrow
Alex
M
Alex P and I implemented the changes we discussed with Amy to Detector.cc. We're currently running a test to see how the grid
spacing affects the gains from XF. We started with small antennas using a grid spacing of 0.01 and we're cutting down by factors of 2 each generation |
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Wed Jun 17 17:21:16 2020, Alex Machtay, Daily Update 6/17/20
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Name
Update for Today
Plans for
tomorrow
Alex M
Worked more with Alex P on AraSim. We've found the cause of the low effective volumes. The
function GainToHeight in Report.cc uses another function called GetGain_1D_OutZero in Detector.cc. The problem is that for some small individuals, we get |
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Tue Jun 16 16:10:52 2020, Alex M, Daily Update 6/16/20
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Name
Update for today
Plans
for Tomorrow
Alex M
Continued working to find the AraSim error. We think we're very close to finding where
the difference between the two individuals (one with nonzero effective volume, one with 0) is arising. We've pinned it down to a series of if statements |
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Mon Jun 15 15:52:45 2020, Alex Patton, Daily Update 6/15/20
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Name
Today's Update
Plans for Tomorrow
Alex
M
Worked with Alex P on looking for the problem in AraSim. We looked in Report.cc where Amy suggested there was an inequality involving
a variable called "Full_window" being compared to the trigger threshold. We followed this down to another function in Report.cc where Full_window |
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Thu Jun 11 15:14:33 2020, Alex Patton, Daily Update 6/11/20
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Name
Today's Update
Plans for Tomorrow
Alex
M
Helped Alex P look through AraSim some more. We wanted to keep trying to nail down whether or not the threshold was passed (the files said
no before, but we wanted to try confirming by looking at the actual values). The files were big but from the values we saw none exceeded the threshold |
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Wed Jun 10 15:47:43 2020, Alex Machtay, Daily Update 6/10/20
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Name
Today's Update
Plans
for Tomorrow
Alex M
I wasn't available for most of the day, but I jumped onto the meeting to help Alex P
continue looking for the problem with the effective volumes. Amy asked us to investigate the phase responses coming out of XF. I posted the plots in the |
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Tue Jun 9 15:00:09 2020, Alex Machtay, Daily Update 6/9/20
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Name
Today's Update
Plams
for Tomorrow
Alex M
Alex P and I kept working on finding differences in AraSim between antennas. We
still haven't found any and we've checked: electric field, maximum peak voltage, effective height, threshold (factor and offset), and the fft (and |
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Mon Jun 8 15:16:16 2020, Alex Patton, Daily GENETIS Update 6/8/20
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Name
Today's Update
Plans for Tomorrow
Alex
M.
Worked with Alex on finding the variables Amy suggested to us in AraSim. We found the Efield and max peak voltage variables and
printed them, comparing three antennas: a small one with normal veffective (nonzero), a small on with 0 veffective, and the actual bicone. The electic |
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Fri Jun 5 14:29:56 2020, Alex Patton, Daily GENETIS Update 6/5/20
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Name
Today's Update
Plans for Monday
Alex
M.
Helped Alex P try to figure out how to get data Amy was asking us to get for comparing antennas in AraSim. We've been stuck
trying to figure out where all of the data is printed (there are a bunch of .cc files and quantities we aren't familiar with--for example, vmmhz in |