Multipactor in Low Pressure Gas and in ... - of Richard Udiljak

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Conference contributions by the author (not included in this thesis): vi [G] R. Udiljak, G. Li, D. Anderson, P. Ingvarson, U. Jordan, U. Jostell, A. Kryazhev, M. Lisak, V. E. Semenov, “Suppression of Multipactor Breakdown in RF Equipment”, RVK 02, June 10-12, 2002, Stockholm, Sweden. [H] R. Udiljak, D. Anderson, U. Jostell, M. Lisak, J. Puech, V. E. Semenov, “Detection of Multicarrier Multipaction using RF Power Modulation”, 4th International Workshop on Multipactor, Corona and Passive Intermodulation in Space RF Hardware, 8-11 September, 2003, ESTEC, Noordwijk, The Netherlands. [I] J. Puech, L. Lapierre, J. Sombrin, V. Semenov, A. Sazontov, N. Vdovicheva, M. Buyanova, U. Jordan, R. Udiljak, D. Anderson, M. Lisak, “Multipactor threshold in waveguides: theory and experiment”, NATO Advanced Research Workshop on Quasi-Optical Control of Intense Microwave Transmission , 17-20 February, 2004, Nizhny-Novgorod, Russian Federation. [J] R. Udiljak, D. Anderson, M. Lisak, J. Puech, V. E. Semenov, “Microwave breakdown in the transition region between multipactor and corona discharge.”, RVK 05, June 14 - 16 juni, Linköping [K] D. Anderson, M. Buyanova, D. Dorozhkina, U. Jordan, M. Lisak, I. Nefedov, T. Olsson, J. Puech, V. Semenov, I. Shereshevskii, R. Tomala, and R. Udiljak, “Microwave breakdown in RF equipment.”, RVK 05, June 14 - 16 juni, Linköping [L] V. E. Semenov, N. Zharova, R. Udiljak, D. Anderson, M. Lisak, J. Puech, and L. Lapierre, “Multipactor inside a coaxial line”, 5th International Workshop on Multipactor, Corona and Passive Intermodulation in Space RF Hardware, 12-14 September, 2005, ESTEC, Noordwijk, The Netherlands. [M] R. Udiljak, D. Anderson, M. Lisak, V. E. Semenov, and J. Puech, “Microwave breakdown in low pressure gas”, 5th International Workshop on Multipactor, Corona and Passive Intermodulation in Space RF Hardware, 12-14 September, 2005, ESTEC, Noordwijk, The Netherlands. [N] C. Armiens, B. Huang, R. Udiljak, D. Anderson, M. Lisak, U. Jostell, and P. Ingvarsson, “Detection of Multipaction using AM signals”,
5th International Workshop on Multipactor, Corona and Passive Intermodulation in Space RF Hardware, 12-14 September, 2005, ESTEC, Noordwijk, The Netherlands. vii
Page 1 and 2: Thesis for the degree of Doctor of
Page 3: Multipactor in Low Pressure Gas and
Page 8 and 9: viii
Page 10 and 11: 3.2.4 Key findings . . . . . . . .
Page 12 and 13: xii
Page 14 and 15: xiv
Page 16 and 17: addition, it is difficult to make c
Page 18 and 19: numerical study of the phenomenon i
Page 20 and 21: to physically damage microwave comp
Page 22 and 23: odd positive integer (N = 1,3,5...)
Page 24 and 25: σ se [−] 2.5 2 1.5 1 0.5 W 1 W m
Page 26 and 27: Voltage [V] 10 4 10 3 10 2 10 0 N=1
Page 28 and 29: even though it may be sufficient fr
Page 30 and 31: where φL and φR are the left and
Page 32 and 33: (cf. Fig. 2.7). When taking the env
Page 34 and 35: 2.1.4 Methods of suppression Many o
Page 36 and 37: Noise (dBm) Power #1 (dBm) Match #1
Page 38 and 39: andom spread in emission velocities
Page 40 and 41: Figure 2.12: Multipactor experiment
Page 42 and 43: where kn is a factor determining th
Page 44 and 45: allows for another design margin, w
Page 46 and 47: Boundary function Method One of the
Page 48 and 49: carriers, because the NLSQ method r
Page 50 and 51: multipactor discharge. Using a Mont
Page 52 and 53: the assumption of a constant ratio
Page 54 and 55: Voltage (V) 10 3 10 2 10 1 10 −2
Page 56 and 57:
3.1.3 Main results The main result
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lytical model is obviously needed.
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where 〈vt 2 〉 represents the av
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these quantities in the range from
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analytical. Attempts were made to f
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only model, the inclusion of ionisa
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Normalised Voltage 1.1 1.05 1 0.95
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Voltage [V] 10 3 10 0 µ=0 µ=0.75
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Chapter 4 Multipactor in irises A c
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h l Figure 4.1: The geometry used i
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N e /N 0 [−] 3 2.5 2 1.5 1 Multip
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to compensate for electron losses i
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4.4 Main results This analysis has
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support for the qualitative analyti
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where R(t) is the average position,
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where d stands for the gap width, V
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there are different oscillatory vel
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Phase [degrees] 60 50 40 30 20 10
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G 100 90 80 70 60 50 40 30 20 10 0
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possible for quite large Ro/Ri-valu
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upper right region of the figures,
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σse,max the zones become wider and
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G 50 45 40 35 30 25 20 15 10 5 0.2
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creasing ratio Ri/Ro was observed.
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Chapter 6 Detection of multipactor
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Amplitude of acceleration [Gm/s 2 ]
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tipactor events that are short-live
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software and the time evolution of
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ditional test sample, a resonant ca
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the FFT. It was concluded that ther
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6.2.1 Single carrier When using the
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Reference signal generator Phase co
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Amplitude [A.U.] 2.5 2 1.5 1 0.5 De
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Chapter 7 Conclusions and outlook T
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tioned there were multipactor in no
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References [1] W. Henneberg, R. Ort
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[27] A. Ruiz et al, “Ti, V, and C
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[51] D. Wolk, D. Schmitt, and T. Sc
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[75] R. Udiljak, Multipactor in low
Page 137:
Included papers A-F 123
Page 141:
Paper B R. Udiljak, D. Anderson, M.
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Paper D R. Udiljak, D. Anderson, M.
Page 149:
Paper F V. E. Semenov, N. Zharova,
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