WEBVTT 1 00:00:00.000 --> 00:00:05.110 Stefania Juks: Share some slides or very nice picture. 2 00:00:15.160 --> 00:00:16.560 Sam Eriksen: I remain a cow. 3 00:00:17.730 --> 00:00:20.183 Sam Eriksen: There we go. I'm not always a cow. 4 00:00:20.490 --> 00:00:21.959 Stefania Juks: The cow is gone. 5 00:00:24.690 --> 00:00:29.959 Sam Eriksen: All right. Yeah. Just go ahead. 6 00:00:30.260 --> 00:00:30.860 Stefania Juks: It's. 7 00:00:31.260 --> 00:00:36.793 Sam Eriksen: Okay, good stuff. Right? See, I'm gonna talk about what 8 00:00:38.160 --> 00:00:52.609 Sam Eriksen: we've done with the Lz collaboration in terms of sustainability. Before I do that I'll do. The obligatory introduction slides to what else is? We're a direct, dark matter experiment based in South Dakota, in an old gold mine. 9 00:00:53.580 --> 00:00:57.639 Sam Eriksen: We've been running for 4 years now. 10 00:00:57.980 --> 00:01:04.450 Sam Eriksen: and we'll probably keep taking data for at least another 4 years. There's about 250 of us 11 00:01:04.580 --> 00:01:09.910 Sam Eriksen: primarily in Europe and the Us. But we also got 12 00:01:10.050 --> 00:01:13.580 Sam Eriksen: people in Asia now. So we're quite spread around the world. 13 00:01:15.670 --> 00:01:31.719 Sam Eriksen: So what's sustainability in Lz? Well, we we actually started up a working group late last year with the goals of quantifying what the environmental impact of running our experiment was and explore ways to reduce this. 14 00:01:31.940 --> 00:01:56.137 Sam Eriksen: and I'll come to later. As to beyond Lz, how this helps. But within Lz, we essentially broke this down into 3 sections. We've got the operations. So you know the actual detective running. Then we've got the computing, analyzing our data. And then we've got the in person meetings. So this isn't exhaustive. But 15 00:01:56.960 --> 00:02:00.079 Sam Eriksen: we have taken these to be the Big 3. 16 00:02:03.360 --> 00:02:12.279 Sam Eriksen: So since we started up, we started looking at all of these with the 1st one we tried to tackle being operations. So 17 00:02:12.720 --> 00:02:24.110 Sam Eriksen: the hard thing with this was when we built the experiment. We didn't really think about energy usage. All that much. We just gave an initial number, for this will be the peak load 18 00:02:24.510 --> 00:02:28.749 Sam Eriksen: we don't care about what the steady state we use is 19 00:02:29.390 --> 00:02:33.169 Sam Eriksen: so actually getting this number has been incredibly difficult. 20 00:02:34.468 --> 00:02:38.060 Sam Eriksen: And is a bit of a fudge. So 21 00:02:38.320 --> 00:02:50.490 Sam Eriksen: in what we're considering here, we only look at our steady State contributions. So the stuff which is on all the time, we don't consider hygiene calibration sources, and whatnot. 22 00:02:50.970 --> 00:03:05.720 Sam Eriksen: But essentially this gives us numbers in the range of 44 to 66 kilowatts. And this is just on 24, 7, 365 days, and where possible, you know, we validate this with whatever monitoring we have. 23 00:03:07.120 --> 00:03:19.839 Sam Eriksen: then in our computing. We actually use 2 computing centers. We use nurse in the Us. Which is our primary one. And then we have a secondary one, which is based on the grid. 24 00:03:21.250 --> 00:03:26.980 Sam Eriksen: And we've monitored how much we're using here, based upon essentially monitoring 25 00:03:27.537 --> 00:03:37.689 Sam Eriksen: jobs. So the ones in the Us use slums, the batch system, and we're able to monitor the amount of energy used by each job and know how much storage we're using. 26 00:03:37.880 --> 00:03:45.769 Sam Eriksen: And so we've been able to work out what the energy usage is running there. Similar story in the Uk. Apart from. It's done on a 27 00:03:46.914 --> 00:03:54.125 Sam Eriksen: site basis. And then we just take what fraction of jobs and storage we have there. 28 00:03:54.860 --> 00:03:58.190 Sam Eriksen: And this gives us some numbers which I'll come to later. 29 00:03:59.640 --> 00:04:08.162 Sam Eriksen: And then for meetings we typically host 2 meetings for the whole collaboration a year which we alternate between the us and the Uk. 30 00:04:08.820 --> 00:04:19.240 Sam Eriksen: And essentially, since we started this working group, we've started properly recording, you know who's gone and how they got there. 31 00:04:19.360 --> 00:04:30.610 Sam Eriksen: And so for our 2 most recent ones. We had one in Ucla, where all of the 50 people who went reported, and we were able to, you know, track their flights and work out how they got there. 32 00:04:31.070 --> 00:04:46.309 Sam Eriksen: and for the one before, which was a brown university, also in the Us. Where we didn't have full reporting, so we had to make some estimates. But it's about equivalent. So you know, nearly 90 tons of Co. 2 for these meet ups. 33 00:04:47.660 --> 00:04:56.680 Sam Eriksen: So we put all of that into a summary. That's what we've got here. And we've translated these into our tons of Co. 2 equivalents. 34 00:04:56.880 --> 00:05:02.126 Sam Eriksen: So we're around 500 tons a year is what we're putting out. 35 00:05:02.680 --> 00:05:07.058 Sam Eriksen: based upon different scenarios, which I'll let people read in to on their own time. 36 00:05:08.510 --> 00:05:21.979 Sam Eriksen: But the point of having this number is, we can now start to think about how to mitigate certain bits. So I'm only gonna briefly show one. Which is this which is 37 00:05:23.400 --> 00:05:50.269 Sam Eriksen: experimenting with different types of meetings. So for the Ucla one, what we did as a trial was we looked at when some other meetings that people in our collaboration want to go to? And we put our collaboration meeting around that. So we put it after a dark matter conference, and before one of the giant, us ones, and we calculated that saved about 12 tons. Nothing we're looking at is this hubs model where you go to somewhere local. 38 00:05:52.330 --> 00:05:55.476 Sam Eriksen: And so just to kind of summarize this 39 00:05:56.520 --> 00:06:01.359 Sam Eriksen: about 2 tons of Co. 2 per year per author. 40 00:06:02.076 --> 00:06:07.199 Sam Eriksen: With operating, the sector being largest and the second largest on flights. 41 00:06:07.840 --> 00:06:22.429 Sam Eriksen: All of this will be used and taken into account for the next experiment which we're planning now, which is xlzd, because that if it's in the Uk. We've got the target of being net 0 in operations. So everything we learn here 42 00:06:22.700 --> 00:06:29.670 Sam Eriksen: we can take hold there, so it'll be easier to adapt. Now, essentially, thank you. 43 00:06:31.090 --> 00:06:32.209 Stefania Juks: Thank you so much, Sam. 44 00:06:32.430 --> 00:06:36.490 Stefania Juks: There also any questions. You could also have a look. 45 00:06:45.620 --> 00:06:54.670 Stefania Juks: I will have one. Otherwise, since you're talking a lot about flights. Do you think this is easy to to reduce? Given the fact that you're a collaboration. 46 00:06:59.990 --> 00:07:02.349 Sam Eriksen: Mixed depends who you ask? 47 00:07:03.940 --> 00:07:06.709 Sam Eriksen: We've we've kind of find. It goes in waves. Of 48 00:07:06.820 --> 00:07:11.420 Sam Eriksen: the younger you are, the more keen you are to travel, and then there's like a plateau period where 49 00:07:11.660 --> 00:07:19.907 Sam Eriksen: you're happy not. And then suddenly you ramp up and you know, wanna hang out with all your old mates again. 50 00:07:20.730 --> 00:07:26.630 Sam Eriksen: so we think it's definitely realistic to get down to one international one a year. 51 00:07:29.270 --> 00:07:35.180 Sam Eriksen: Which is what we're pushing for now, and beyond that go for a hubs model. 52 00:07:36.380 --> 00:07:40.739 Stefania Juks: Okay, I see also. Greg has raised his hand. 53 00:07:41.520 --> 00:08:02.129 Greg Hallewell: Yeah, I have a question about the carbon footprint of the Xenon itself, because Xenon is only present at 10 to the minus 8 in the atmosphere, and if you need New Xenon, the distillation cost is probably quite high. I mean, I know the same distillation process makes liquid oxygen liquid nitrogen. But is that factored in. 54 00:08:02.490 --> 00:08:03.640 Sam Eriksen: Not too bad. 55 00:08:03.640 --> 00:08:04.520 Greg Hallewell: Was at all. 56 00:08:04.520 --> 00:08:14.710 Sam Eriksen: But in for excel. Zd, we've started doing full carbon lifecycle assessments, and for that we are talking to the 57 00:08:15.090 --> 00:08:18.540 Sam Eriksen: people who we buy Xenon from to get those numbers. 58 00:08:23.210 --> 00:08:24.050 Greg Hallewell: Okay. Thanks. 59 00:08:27.720 --> 00:08:32.489 Stefania Juks: I thank you. Then with that I think we can also move on flash talk. 60 00:08:33.500 --> 00:08:36.740 Stefania Juks: Oh, Martin, if you're around, you could start sharing.