NDLI: Development of a 10 MW hollow beam klystron for the ILC

Content Provider	IEEE Xplore Digital Library
Author	Ferguson, P.
Copyright Year	2008
Description	Author affiliation: MDS Co., Oakland, CA (Ferguson, P.)
Abstract	Present efforts to achieve a high efficiency 1.3 GHz RF source for the ILC are centered on the development of multiple beam klystrons (MBK) and more recently, on a sheet beam klystron (SBK). We have initiated the development of a hollow beam klystron (HBK) to fulfill the stringent requirements imposed by the ILC. That is, the minimum efficiency should be 65% at an RF output power of 10 MW and the cathode current density should be less than 5 $A/cm^{2}.$ The pulse width must be 1.5 milliseconds at a pulse rate frequency of 15 Hz. We have simulated several 7 cavity interaction circuits using our fully relativistic 2frac12D klystron large signal code, KLSC. To date, we have achieved the following: beam voltage: 120 kV, beam current: 140 A, beam perveance: 3.37 micropervs, efficiency: 63%, RF output power: 10.6 MW, saturated gain: 47.4 dB, maximum gradient: 137kV/cm, beam current density: 30 $A/cm^{2},$ beam area convergence: 6:1. These parameters were obtained by varying the diameter of the drift tube and the inner and outer diameter of the electron beam, the cavity gap-gap spacing and the cavity gap length. We will present graphical date showing that the electron bunching is almost solely axial modulation with minimal radial modulation, unlike conventional solid beam klystrons. We will also present performance data for other circuits where the efficiency is lower but with collector depression, can be increased above 65%.
Starting Page	1
Ending Page	1
File Size	29899
Page Count	1
File Format	PDF
ISBN	9781424419296
ISSN	07309244
DOI	10.1109/PLASMA.2008.4590957
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-06-15
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Klystrons Cavity resonators Radio frequency Modulation Current density Cathodes Power generation
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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