Patent by J. N. Chubb on vacuum switches:

"Improvements in and relating to Electrical Vacuum Swiches" Patent Specification 967,737. Date of filing complete specification July 11, 1961

Papers by J. N. Chubb on vacuum physics:

1. "A Monte Carlo computer programme for analysis of molecular gas flow" UKAEA Research Group Report CLM-R54, Dec 1965

2. "Monte Carlo analysis of pumping speed test dome performance for several vapour diffusion pump geometries. Vacuum 16 Issue 11, November 1966, Pages 591-596 On line via: www.sciencedirect.com.

3. "Performance assessment for cryopumping" Vacuum 20 (11) 1966 p477. On line via: www.sciencedirect.com.

4. "Experience with a pulsed gas flow technique for calibrating ion gauges and mass spectrometers" Vacuum 17 1967 p449 with L. Gowland. On line via: www.sciencedirect.com.

5. " Condensation pumping of liquid helium cooled surfaces Vacuum, 17, Issue 3, March 1967, Page 163 On line via: www.sciencedirect.com. J. N. Chubb, L. Gowland and I. E. Pollard

6. "The automatic control, information processing and analyssis of condensation pumping experiments" Proc 4th Intl Vacuum Congress 1968 with L. Gowland, I. E. Pollard and E. K. Sinton. On line via: www.sciencedirect.com.

7. "Condensation pumping of hydrogen and deuterium on liquid helium cooled surfaces" Brit J. Appl Physics 1 1968 p361 with L. Gowland and I. E. Pollard

8. "Control systems for vacuum cryopumps" Symposium on Fusion Technology Paper 14 Oxford, July 1968 with H. R. Whittle, L. Gowland and B. Pebworth

9. "Conclusions from experimental studies of condensation pumping of hydrogen and deuterium on liquid helium cooled surfaces" Symposium on Fusion Technology Paper 19 Oxford, July 1968 with L. Gowland and I. E. Pollard

10. "Monte Carlo studies of free molecular gas flow though various vacuum structures" Proc 4th Intl Vacuum Congress 1968. On line via: www.sciencedirect.com.

11. "Control system for vacumm cryopumps" Symposium on Fusion Technology, Oxford 1968 with H. R. Whittle, L. Gowland and B. Pebworth

12. "Sticking coefficient and desorption rate variations during growth of condensed gas layers on liquid helium cooled surfaces" Colloque de Physique des surfaces dans les gaz rarefies. Le Vide 139 Jan/Fev 1969 p64

13. "Intial report on work to enhance a Monte-Carlo computer program for studying sputtering and backscattering from pocketed and finned surfaces" Report to JET Design Team UKAEA. Culham Laboratory Report CLM/RR/32/1 18 May 1976

Follow on work: After the above vacuum work was finished T. J. Lee (Senior Research Fellow, Royal Obervatory, Edinburgh, working at Culham) took over use of the special cryopumping test rig that had been developed and used for a number of the studies reported above. He published a number of papers concerning the apparent anomaly that had been found in the vapour pressue curve of hydrogen and confirmed the expectation [2 & 5 above] this was due to thermal radiation loading. The following papers have relevance to the above cryopumping studies:

1. "The condensation of H2 and D2: Astrophysics and vacuum technology" T. J. Lee J. Vac Sci and Tech 9 p257

2. "The condensation and evaporation of hydrogen on liuid helium cooled surfaces" T. J. Lee J. Proc 3rd Intl Cryogenic Eng Confr, Berlin, 25-27 May 1970

3. "Condenstaion of hydrogen on interstellar grains" T. J. Lee, L. Gowland, V. C. Reddish Nature 231 June 28 1971 p193

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