Demonstration of Complete Multipactor Suppression in Externally Powered Dielectric Loaded Accelerators Joint efforts from Euclid (SBIR grant DE-SC0007629),

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Presentation transcript:

Demonstration of Complete Multipactor Suppression in Externally Powered Dielectric Loaded Accelerators Joint efforts from Euclid (SBIR grant DE-SC0007629), AWA, NRL, SLAC. Chunguang Jing Euclid Techlabs LLC, / AWA, Argonne Steve Gold Naval Research Laboratory (retired) AAC2016, Aug, 2016

Electric Field Vectors External Powered Dielectric-Loaded Accelerating (DLA) Structure Euclid, ANL, NRL, SLAC Collaboration Program Goals: Demonstration of high gradient, practical dielectric accelerators Geometry Advantages Simple geometry No field enhancements on irises High gradient potential Comparable shunt impedance Easy to damp HOM Electric Field Vectors Major concerns Multipactor Breakdown External rf powered or beam wakefield driven

Multipactor in Dielectric Accelerators SEE Yield Curve dmax d d = 1  Multiplication Region  structure attenuation e1 e2 Ki S21 multipactor loading Light Intensity (arb. units) Multipactor Power (MW) S11 Incident Power (MW) J. G. Power, et al, Phys. Rev. Lett. 92, 164801 (2004).

Multipactor Mitigation by TiN Coating 25% improvement 1.3nm ALD coating C. Jing, et al., IEEE Trans. Plasma Sci. 38(6), 1354–1360 (2010).

Multipactor Suppression by surface grooves 4 different grooved DLA Structures were fabricated. Unfortunately no high power test being performed. S. Antipov, et al, Proc. PAC2011, New York, NY, USA, pp.310-312.

Multipactor Suppression by Solenoid field Principle: the introduced Bz can effectively alter the transit time  of secondary electrons. A proper strength of Bz makes  in the range of (T/2,T) so that Er is always pushing electrons back to the dielectric surface, leading to a very small impact energy, then SEE<1. 0.2T~0.6T for Xband C. Chang, J. Verboncoeur, S. Tantawi, and C. Jing, J. Appl. Phys. 110, 063304 (2011).

Impact energy and particle numbers for different strength of the solenoid field =0.25 =0.5 = =2

The First Test (Dec.2012) Limited solenoid strength  limited success C. Jing, et al, Appl. Phys. Lett. 103, 213503 (2013).

The Latest Test(Oct.2015) 1T solenoid Standing wave DLA RF probe to monitor the field Rf probe C. Jing, S. H. Gold, Richard Fischer, and W. Gai, Appl. Phys. Lett. 108, 193501 (2016).

Experimental Setup

Results(I) Bifurcation Enhancement Mitigation Blocking

Results(II) Prf ~42kW Bz ~2.4KG Bz ~9.4KG Bz ~0KG Prf ~207kW Time (ns)

Simple circuit model for a SW DLA w/ multipactor: est. electron energy ~1keV ave. if assuming all missing power absorbed by electrons Turn-on time~15ns

Simple circuit model for a SW DLA w/ multipactor: est. electron energy ~9keV ave. if assuming all missing power absorbed by electrons Turn-on time~6ns

Long pulse length (FWHM~400ns)

Summary Successfully demonstrate the complete multipactor suppression with an external solenoid field. Theoretical studies are needed to improve the understanding of the experimental results (like accel. gradient, freq. dependences, etc). Studies of the combination of different techniques are needed to reduce the requirement of solenoid strength.