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radiometer gauge, see ‘Knudsen gauge’
rate of incidence 2,30
reference leak (helium) 548
refrigeration systems, leak tightness control 525
refrigerator cryopump, see ‘cryopump’
residence time 64,71,72
residual gas analyzer (RGA) 453
-, autoresonant trap mass spectrometer 453,480
-, leak detection with 528,551
-, magnetic deflection mass spectrometer 453,465
-, mass range 476
-, quadrupole mass spectrometer 453,472
-, resolution 453,460
-, sensitivity 486
-, transmission 454,465,476
residual gas spectra
-, in case of leakage 501
-, interpretation 490
-, turbomolecular pump 500
resolution 453,460
-, autoresonant trap mass spectrometer 485
-, magnetic deflection mass spectrometer 467,469
-, quadrupole mass spectrometer 473,475,476
resolving power, see ‘resolution’
response time (leak detection) 543,559,561,564,567
Reynolds number 103,129
RGA, see ‘residual gas analyzer’
rhenium 637,687
-, cathode 429
Roots (Philander H. and Francis M.) 244
Roots/claw combination 266
Roots pump 4,160,235,243,355
-, back-leakage 246
-, bypass line 252
-, canned electric motor 254
-, canned magnetic drive 254
-, combination with claw pump 266
-, comparison with MDP 280
-, condensation of vapours 259
-, electronic speed control 253
-, gas cooling to the rotors 256
-, heat exchanger 256
-, heat generation 251
-, hydrokinetic fluid coupling 252
-, isochoric compression 168,251,255,256
-, magnetic coupling 254
-, maximum compression ratio 246,248
-, multilobe rotors 257
-, multistage system 257,301,344,355
-, pump properties 260
-, pumping speed curves 247,250,253,258,279
-, purge gas facility 259
-, slip coupling, see ‘hydrokinetic fluid coupling’
-, slit compression 246,247,249,251
-, volumetric pumping speed 246
-, with exhaust valve 255
Roots pump system multiple stage, see ‘Roots pump’
rotameter 512
rotary-piston pump 190
-, imbalance 191
-, isochoric compression 168
-, pump properties 193
-, single-stage 192
-, two-stage 192
-, volumetric pumping speed 190
rotary-vane pump 160,175
-, active lubrication 180
-, compression work 187
-, dead volume 175
-, exhaust valve 180
-, gas ballast 181
-, gas ballast valve 183,185,187
-, isochoric compression 168
-, maximum compression ratio 176
-, oil supply 179
-, oil-sealing 175
-, one-way valve 180
-, passive lubrication 180
-, pump properties 181
-, pumping speed curves 188
-, residual gas composition 266
-, single-stage 178
-, two-stage 178
-, volumetric pumping speed 177
-, water vapour tolerance 183,187,194
rotary feedthrough 596
rotary pump
-, dry 163,235
-, wet 162,168
-, liquid-sealed 168
-, oil-sealed 163
roughing pump 162,318,344,348
RTV-566, see ‘silicone adhesive’
Rutherford 6
