Presentation is loading. Please wait.

Presentation is loading. Please wait.

装置保護 (Apparatus protection) コスト削減 (Low-cost experiment)

Similar presentations

Presentation on theme: "装置保護 (Apparatus protection) コスト削減 (Low-cost experiment)"— Presentation transcript:

1 装置保護 (Apparatus protection) コスト削減 (Low-cost experiment)
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 LHe - Tb = 4.2 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 金属注意!! Cold metals are dangerous!!
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)


5 窒息 Suffocation 換気!VENTILATION!

6 狭い部屋での作業は特に注意 Be careful if you are in a small room
窒息 Suffocation LN2 - 開放系 Open system - 大きな蒸発潜熱 Large latent heat 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. LHe - 閉鎖系 Closed system - 小さな蒸発潜熱 Small latent heat 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) 狭い部屋での作業は特に注意 Be careful if you are in a small room

7 Tb, oxygen > Tb, nitrogen
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!

8 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!!

9 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.

10 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

Download ppt "装置保護 (Apparatus protection) コスト削減 (Low-cost experiment)"

Similar presentations

Ads by Google