tours:faq
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tours:faq [2019/03/12 09:29] constan [How much water does the laboratory use?] |
tours:faq [2021/01/20 10:04] constan |
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| ===== Questions with Incomplete Answers ===== | ===== Questions with Incomplete Answers ===== | ||
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| + | ==== Fun facts about FRIB ==== | ||
| + | * Will be the world-leading rare isotope facility, with the most powerful heavy-ion beams | ||
| + | * Accelerates heavy ions to ~50% of the speed of light | ||
| + | * Produces rare isotopes that are radioactive and short-lived; never found on Earth, but stars make them! | ||
| + | * Is expected to discover ~1000 new isotopes (varieties of elements that have never been observed) | ||
| + | * Will serve over 1500 researchers from 50+ countries | ||
| + | * Facility consists of four buildings, 565,000 gross square feet | ||
| + | * Underground tunnel: 570 feet long, 70 feet wide, 13 feet high; floor is 32 feet underground | ||
| + | * Total Project Cost: $730 million, mostly funded by the US Department of Energy Office of Science | ||
| + | * Home to the #1 US nuclear physics graduate program | ||
| + | * Planned to come online in early 2022 | ||
| + | |||
| + | ==== Why is the cycstopper standing on end, rather than lying flat like the K500/K1200? ==== | ||
| + | //(from Stefan Schwarz)// Main technical reason: the cyc-stopper is better at accepting large beams (in terms of emittance, i.e. beam width times angle) in its axial = horizontal direction, as built. | ||
| + | A bit of background: for the beam to stop efficiently in gas stoppers, it needs to have less energy spread than what we typically get from the A1900. | ||
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| + | To reduce that energy spread we use what’s known as momentum compression, i.e. the process of removing longitudinal energy spread with the help of a dispersive element (big dipole magnets in N3/4) and matched wedge-shaped degraders. However, since we bend/disperse the beam horizontally, the beam quality suffers in that plane. The cyc-stopper’s acceptance is higher in the horizontal direction when ‘standing’, so it’s able to make up for the larger beam emittance in that plane. | ||
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| + | There are also practical reasons: as built, the stopped beam will come out on the fixed south side of the magnet through the central bore. It’s a lot easier to construct an extraction beam line with this concept than taking the beam out through the top or bottom half in a ‘flat’ orientation. Also, access and work on the low-energy ion guides (carpets, conveyor) is a lot easier that way. | ||
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| + | FYI, we entertained the ‘flat’ orientation for a while in the early design phase, but for the reasons outlined above, we gave up on that rather quickly. | ||
| ==== How much water does the laboratory use? ==== | ==== How much water does the laboratory use? ==== | ||
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| * 2013: ReA3 reaccelerator commissioned. | * 2013: ReA3 reaccelerator commissioned. | ||
| * 2015: ReA3 experiments begin. | * 2015: ReA3 experiments begin. | ||
| - | * 2016: Cyclotron Gas Stopper online? | + | * 2019: Cyclotron Gas Stopper online? |
| * 2022: FRIB comes online? | * 2022: FRIB comes online? | ||
tours/faq.txt · Last modified: 2024/05/30 09:23 by constan
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