Lithium Stripper

Info

The Liquid Lithium Charge Selector(LLCS), or simply lithium stripper, is used to strip certain charge states from the beam before it is accelerated even further for better transmission. What's unique about this peculiar device is that rather than using a metal foil of gas to strip the beam, a film of liquid lithium is used. The liquid form is advantageous over the other options because this option allows for higher charge states. With lithium, its low melting point, low vapor pressure, and high heat capacity makes it the best to use.

One main drawback about liquid lithium though is that it is extremely reactive with oxygen and nitrogen. To migigate this hazard, a containment vessel surrounds the lithium film device. This vessel is always filled with argon, this way if a leak is to ever occur, the argon can immediately displace the gasses inside and prevent any catastrophic reaction.

Tips/Notes

Location

LS1

Devices/PV's

Personnel

Takuji Kanemura

Michael LaVere

Ryoto Iwai

Shane:“ strip certain charge states from the beam” isn't very clear or even true, it further strips electrons from the ions in the beam. This is done for the sake of achieving a particular charge state and not necessarily for transmission Shane: “metal foil of gas” doesn't make sense to me, not overly familiar with strippers but Googling this phrase returned 1 result, a patent from 1931/ Shane: “ this option allows for higher charge states” I feel like this opens the door to a lot of questions we can't answer, I can assume why liquid would be better at stripping than a gas, but I think it's also worded vaguely. Shane: “With lithium, its low melting point, low vapor pressure, and high heat capacity makes it the best to use.” sounds awkward but that's a bit of a nit pick Shane: “the argon can immediately displace the gasses inside and prevent any catastrophic reaction.” The stripper is kept under vacuum and you just mentioned that the lithium has low vapor pressure so I assume that's not the “gasses” you refer to. Also lithium has a pretty average vapor pressure, but I assume it's low relative to the melting point and heat capacity. I probably wouldn't add that line anyway without a more solid explanation as to why those are relevant in the first place Shane: I'd reverse that map diagram, for new operators it's upside down and will be a source of confusion Shane: I don't know if I like the Personnel category, I think it should point to the contact sheet. Someone randomly calling Mike LaVere because they can't reach Takuji seems like a natural consequence of this lay out. Shane: I was pretty pretty ctirical, that film diagram is very useful