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

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[63] R. Woo, J. Appl. Phys. 39, pp. 1528-1533 (1968). [64] K. Sakamoto, Y. Ikeda, and T. Imai, J. Phys. D: Appl. Phys. 22, pp. 1840-1847 (1989). [65] E. Somersalo, P. Yla-Oijala, and D. Proch, “Analysis of multipacting in coaxial lines,” Proceedings of 1995 Particle Accelerator Conference, 1996, Dallas, Texas. [66] E. Somersalo, P. Yla-Oijala, D. Proch, and J. Sarvas, Particle Accelerators 59, pp. 107-141 (1998). [67] E. Chojnacki, Phys. Rev. Special Topics - Accelerators and Beams 3, pp. 032001:1-5 (2000). [68] S. K. Nagesh, D. Revannasiddiah, and S. V. K. Shastry, Pramana J. Phys. 64, pp. 95-110 (2005). [69] V. Semenov, V. Nechaev, E. Rakova, N. Zharova, D. Anderson, M. Lisak, J. Puech, Phys. Plasmas 12, pp. 073508:1-6 (2005). [70] R. Kishek, Y. Y. Lau and R. Gilgenbach, “Temporal Evolution of Multipactor Discharge”, Proceedings of the 1995 Particle Accelerator Conference, 1-5 May, 1995, Dallas, Texas, USA. [71] D. Raboso and A. Alstaff, “A new RF breakdown detection method based on electron monitoring”, Proceedings of the 4 th International Workshop on Multipactor, Corona and Passive Intermodulation in Space RF Hardware, 8-11 September, 2003, ESTEC, Noordwijk, The Netherlands. [72] A. Neuber, J. Dickens, D. Hemmert, H. Krompholz, L. L. Hatfield and M. Kristiansen, IEEE Trans. Plasma Sci. 26, pp. 296-303, (1998). [73] T. Fujii and S. Moriyama, IEEE Trans. Plasma Sci. 29, pp. 318-325, (2001). [74] R. Udiljak, D. Anderson, U. Jostell, M. Lisak, J. Puech, and V. E. Semenov, “Detection of Multicarrier Multipaction using RF Power Modulation”, Proceedings of the 4 th International Workshop on Multipactor, Corona and Passive Intermodulation in Space RF Hardware, 8-11 September, 2003, ESTEC, Noordwijk, The Netherlands. 120
[75] R. Udiljak, Multipactor in low pressure gas, Licentiate Thesis (Chalmers University of Technology, Gothenburg, 2004). 121
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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
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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 and 132: [27] A. Ruiz et al, “Ti, V, and C
Page 133: [51] D. Wolk, D. Schmitt, and T. Sc
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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