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

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[40] M. Merecki, Rapport de stage. Etude de l’effet multipactor dans les dispositifs hyperfrequences, Master’s Thesis, (CNES, Toulouse, 2003) [41] V. G. Andreev and D. G. Zaidin, Translated from Pribory i Tehnika Éksperimenta 3, pp. 164-165 (1971) [42] 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”, Conference Proceedings RVK 02, June 10-12, 2002, Stockholm, Sweden. [43] D. Ruzic, R. Moore, D. Manos, and S. Cohen, J. Vac. Sci. Tech. 20, pp. 1313-1216 (1982). [44] N. Diaz, S. Castaneda, J. M. Riplada, I. Montero, D. Raboso, I. Galan, and F. Rueda, “Low secondary electron emission thin films to prevent the multipactor effect in high-power RF devices in space”, Proceedings from the workshop on Multipactor, RF and DC Corona, and Passive Intermodulation in Space RF Hardware, 4-6 September, 2000, Noordwijk, the Netherlands. [45] R. L. Geng and H. S. Padamsee, “Exploring Multipacting Characterstics of a Rectangular Waveguide”, Proceedings of the 1999 Particle Accelerator Conference, 27 March - 2 April, 1999, New York, NY, USA. [46] A. Sazontov, M. Buyanova, V. Semenov, E. Rakova, N. Vdovicheva, D. Anderson, M. Lisak, J. Puech, and L. Lapierre, Phys. Plasmas 12, pp. 053102:1-8 (2005). [47] R. Udiljak, D. Anderson, M. Lisak, V. E. Semenov, and J. Puech, Phys. Plasmas 10, pp. 4105-4111, (2003). [48] A. J. Hatch and H. B. Williams, J. Appl. Phys. 25, pp. 417-423 (1954). [49] Website: http://www.nsab-sirius.com/ visited on April 7. 2004. [50] ESA for ECSS, Space Engineering, Multipaction design and test, ECSS-E-20-01A, (ESA Publications Division, Noordwijk, 2003) 118
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Thesis for the degree of Doctor of
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Multipactor in Low Pressure Gas and
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Conference contributions by the aut
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viii
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3.2.4 Key findings . . . . . . . .
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xii
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xiv
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addition, it is difficult to make c
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numerical study of the phenomenon i
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to physically damage microwave comp
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odd positive integer (N = 1,3,5...)
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σ se [−] 2.5 2 1.5 1 0.5 W 1 W m
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Voltage [V] 10 4 10 3 10 2 10 0 N=1
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even though it may be sufficient fr
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where φL and φR are the left and
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(cf. Fig. 2.7). When taking the env
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2.1.4 Methods of suppression Many o
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Noise (dBm) Power #1 (dBm) Match #1
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andom spread in emission velocities
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Figure 2.12: Multipactor experiment
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where kn is a factor determining th
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allows for another design margin, w
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Boundary function Method One of the
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carriers, because the NLSQ method r
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multipactor discharge. Using a Mont
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the assumption of a constant ratio
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Voltage (V) 10 3 10 2 10 1 10 −2
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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
Page 81: 4.4 Main results This analysis has
Page 84 and 85: support for the qualitative analyti
Page 86 and 87: where R(t) is the average position,
Page 88 and 89: where d stands for the gap width, V
Page 90 and 91: there are different oscillatory vel
Page 92 and 93: Phase [degrees] 60 50 40 30 20 10
Page 94 and 95: G 100 90 80 70 60 50 40 30 20 10 0
Page 96 and 97: possible for quite large Ro/Ri-valu
Page 98 and 99: upper right region of the figures,
Page 100 and 101: σse,max the zones become wider and
Page 102 and 103: G 50 45 40 35 30 25 20 15 10 5 0.2
Page 104 and 105: creasing ratio Ri/Ro was observed.
Page 107 and 108: Chapter 6 Detection of multipactor
Page 109 and 110: Amplitude of acceleration [Gm/s 2 ]
Page 111 and 112: tipactor events that are short-live
Page 113 and 114: software and the time evolution of
Page 115 and 116: ditional test sample, a resonant ca
Page 117 and 118: the FFT. It was concluded that ther
Page 119 and 120: 6.2.1 Single carrier When using the
Page 121 and 122: Reference signal generator Phase co
Page 123 and 124: Amplitude [A.U.] 2.5 2 1.5 1 0.5 De
Page 125 and 126: Chapter 7 Conclusions and outlook T
Page 127 and 128: tioned there were multipactor in no
Page 129 and 130: References [1] W. Henneberg, R. Ort
Page 131: [27] A. Ruiz et al, “Ti, V, and C
Page 135 and 136: [75] R. Udiljak, Multipactor in low
Page 137: Included papers A-F 123
Page 141: Paper B R. Udiljak, D. Anderson, M.
Page 145: Paper D R. Udiljak, D. Anderson, M.
Page 149: Paper F V. E. Semenov, N. Zharova,
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