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注意事項 What you should pay attention are…

注意事項 What you should pay attention are…. 耳たこなお話 Boring issues. 凍傷 (Frostbite) 窒息 (Suffocation) 爆発 (Explosion). ユーザーとして重要なお話 Important issues. 装置保護 (Apparatus protection) コスト削減 (Low-cost experiment). 寒剤 Cryogens. LN 2 - T b = 77 K - 比較的 蒸発潜熱大 Relatively large latent heat

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注意事項 What you should pay attention are…

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  1. 注意事項 What you should pay attention are… 耳たこなお話 Boring issues • 凍傷 (Frostbite) • 窒息 (Suffocation) • 爆発 (Explosion) ユーザーとして重要なお話 Important issues • 装置保護 (Apparatus protection) • コスト削減 (Low-cost experiment)

  2. 寒剤 Cryogens LN2- Tb = 77 K - 比較的蒸発潜熱大Relatively large latent heat - 比較的安価 Relatively cheap LHe- Tb = 4.2 K - 蒸発潜熱小 Small latent heat - 大きなガスエンタルピーLarge gas enthalpy - 高価 Expensive

  3. 凍傷 Frostbite LN2- 液体に注意 Mind the liquid! - 染み込ませない Do not soak! - 靴下注意 Socks may be dangerous. LHe- ガスに注意 Mind the gas! 短時間に多量の冷たいガスが発生することありLarge amount of cold gas will be generated in a short time. 金属注意!!Cold metals are dangerous!! 布手袋禁止 (ゆるい皮手袋使用)Do NOT use cloth gloves (Use loose skin gloves)

  4. 窒息 Suffocation 換気！VENTILATION! 換気！VENTILATION! 換気！VENTILATION! 換気！VENTILATION! 換気！VENTILATION!

  5. 酸素欠乏の危険が常にある。(急には生じにくい)酸素欠乏の危険が常にある。(急には生じにくい) Oxygen-deficiency may happen, but it may advance slowly. 酸素欠乏の危険は低いが、起きたら早い。(クエンチ) Oxygen-deficiency may not happen but, once it happens, it may advance rapidly. (Quench) 窒息 Suffocation LN2 - 開放系 Open system - 大きな蒸発潜熱 Large latent heat LHe - 閉鎖系 Closed system - 小さな蒸発潜熱 Small latent heat 狭い部屋での作業は特に注意Be careful if you are in a small room

  6. 爆発 Explosion • Tb, oxygen > Tb, nitrogen 窒素が酸素と置換 Your LN2 might become LO2 • Vgas ~ 700×Vliquid 閉じ込めるな！DON’T SEAL OFF!

  7. 閉塞 Blocking • ヘリウム容器が閉塞したら… • When your LHe container is blocked… • 皮手袋をして、「栓」を溶かすために銅パイプをゆっくり挿入Wear skin glove. Insert a copper pipe slowly to melt the “plug”. • つつかない!! NEVER poke!!

  8. 逆止弁と安全弁 (Check valve & safety valve) 複数の逆止弁/安全弁の使用が望ましい If possible, use multiple check/safety valves.

  9. ヘリウムは高い Helium is expensive ヘリウムを使っていて、漏れてしまったら、それは空中に消えてしまう。二度と捕まえることはできない。 “When you hear music, after it's over, it's gone in the air. You can never capture it again.” - “Last Date” by Eric Dolphy

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