USPAS - Particle Accelerator Vacuum Engineering [lecture

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Additional resources for USPAS - Particle Accelerator Vacuum Engineering [lecture slides]

Example text

DV Q S= = dt P USPAS January 2004 Vacuum Fundamentals Page 32 Throughput Defined Defined as as aa measure measure of of gas gas flow flow rate rate (Torr-liters/sec) (Torr-liters/sec) • For constant pumping speed throughput varies with pressure: d(PV ) = SP Q= dt • Qleak Qoutgas Under dynamic conditions: d(PV ) = Q - S(P - Po ) dt USPAS January 2004 Vacuum Fundamentals Page 33 QPump Conductance Defined Defined as as aa measure measure of of ease ease with with which which abstract abstract volumes volumes can can pass pass from from one one place place in in aa vacuum vacuum system system to to another.

218 E3/r) Z (meters) USPAS January 2004 Estimating Gasloads Page 6 Photo-desorption rates vary with dose “Eta-Leveling” ⎛ Peak PSR ηi = ηbase ⎜ ⎜ PSRi ⎝ ⎞ ⎟ ⎟ ⎠ n where η = photo-desorption coeff. (molecules/photon) PSR = Synch. Rad. 639 M where QE = gasload due to evaporation (Torr-liters/sec) T = temperature (K) M = molecular weight (grams/mole) PE = vapor pressure of material (Torr) P = pressure (Torr) A = surface area of material evaporating (cm2) USPAS January 2004 Estimating Gasloads Page 12 Leakage True True Leaks Leaks are are steady-state steady-state gas gas loads, loads, which which limit limit the the ultimate ultimate pressure pressure of of aa vacuum vacuum system.

Vacuum Technology and Space Simulation”, Santeler et al, NASA SP-105, 1966 USPAS January 2004 Estimating Gasloads Page 14 Examples of True Leaks Real leak – physical hole or crack in vessel wall allowing gas to enter the vessel USPAS January 2004 Estimating Gasloads Page 15 Another example of a true leak USPAS January 2004 Estimating Gasloads Page 16 Examples of Virtual Leaks AA virtual virtual leak leak isis aa volume volume of of trapped trapped atmospheric atmospheric gas gas that that leaks leaks into into the the vacuum vacuum vessel vessel through through holes holes or or cracks cracks that that do do not not go go all all the the way way through through the the vessel vessel wall.

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