Design and characterization of dielectric filled TM110 microwave cavities for ultrafast electron microscopy

Verhoeven, W.; Rens, J.F.M. van; Kemper, A.; Rietman, E. H.; Doorn, H. A. van; Koole, I.; Kieft, ER Erik; Mutsaers, P.H.A.; Luiten, O.J.

doi:10.1063/1.5080003

Cited by 17 publications

(8 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Further, the temperature maximum is material dependent and shifts on a time scale of 10 −6 –10 −11 s (see Figure 4c) that can be accessed by advancing experiments with pulsed electron beams. [ 6,25,27,28 ]…”

Section: Resultsmentioning

confidence: 99%

Exploring Functional Materials by Understanding Beam‐Sample Interactions

Kisielowski

Specht

Rozeveld

et al. 2022

Adv Funct Materials

View full text Add to dashboard Cite

Ultra-low-dose electron diffraction is performed with a double metal cyanide catalyst (DMC) to understand how electron irradiation stimulates structural alterations in functional materials. The commonly fading diffraction patterns with dose accumulation depend on the irradiated area and the beam current even when below 50 femto Amperes. Heat generation is observed and modeled by statistical, inelastic scattering events to describe how phonon excitations modulate radiation hardness. Specifically, the characteristic 1/e-decay of Bragg intensities from DMC is delayed from 6 to 30 eÅ −2 at room temperature, which is comparable to the effect of embedding radiation soft matter in ice. DMC's radiation hardness is enhanced by a latency dose that forms during a phase transformation. This unifying model predicts that a critical dose rate exists for any material that varies between 0.1 and 10 4 eÅ −2 s −1 because of a material dependent competition of heat generation and spread. It shows that Brillouin scattering causes time dependent perturbations in electron irradiated solids that trigger time-temperature-transformations on a time scale of nanoseconds to microseconds at room temperature, which is not included in traditional models describing the decay of Bragg intensities by radiolysis.

show abstract

Section: Resultsmentioning

confidence: 99%

Exploring Functional Materials by Understanding Beam‐Sample Interactions

Kisielowski

Specht

Rozeveld

et al. 2022

Adv Funct Materials

View full text Add to dashboard Cite

show abstract

“…On the other hand, the T of samples ( T (0.5-20, 1) ) by the induction soldering of MW at 1, 5, 10, 20, 30 W output powers for 30 s increased as an increase in both width and MW output power, as shown in Figure 6b and Table S1; T (0.5-20, 1) = 0.1-2. Figure 7a,c, the magnetic field in the cavity was uniformly widespread at the 90 • angle direction against the sample conveying direction, and the magnetic field intensity around the bulk silver also increased with an increase in width [25][26][27]. The increase in magnetic field intensity around bulk silver accompanied with an increase in width would be caused by a uniform strong magnetic field along width direction and 90 • angle against the sample conveying direction [25][26][27].…”

Section: Thermal Property Of Silver Pad Patterns By the Induction Solmentioning

confidence: 91%

“…Figure 7a,c, the magnetic field in the cavity was uniformly widespread at the 90 • angle direction against the sample conveying direction, and the magnetic field intensity around the bulk silver also increased with an increase in width [25][26][27]. The increase in magnetic field intensity around bulk silver accompanied with an increase in width would be caused by a uniform strong magnetic field along width direction and 90 • angle against the sample conveying direction [25][26][27]. Due to generation of higher eddy current associated with an increase in magnetic field intensity resulting from an increase in width, higher Joule heat, which is induced by eddy current, is generated with an increase in width and consequently T would increase [24].…”

Section: Thermal Property Of Silver Pad Patterns By the Induction Solmentioning

confidence: 95%

“…The magnetic field distribution intensities around the bulk silver samples, which are (width, length) = (1 mm, 5 mm), (1 mm, 10 mm), (1 mm, 15 mm), and (1 mm, 20 mm), are almost the same as those shown in Figure 7b. This is because the direction of magnetic field vibration is the same with the direction of length and the magnetic field intensity decreases from the center to length direction [25][26][27]. Therefore, the samples do not have the possibility to absorb MW effectively, even if the sample length increases.…”

Section: Induction Soldering System By Mwmentioning

confidence: 99%

See 1 more Smart Citation

Investigation of the Thermal Properties of Electrodes on the Film and Its Heating Behavior Induced by Microwave Irradiation in Mounting Processes

et al. 2020

View full text Add to dashboard Cite

We have developed a novel microwave (MW) soldering system using a cylindrical single-mode TM110 MW cavity that spatially separates the electric fields at the top and bottom of the cavity and the magnetic field at the center of the cavity. This MW reactor system automatically detects the suitable resonance frequency and provides the optimum MW irradiation conditions in the cylindrical cavity via a power feedback loop. Furthermore, we investigated the temperature properties of electrodes by MW heating with the simulation of a magnetic field in the TM110 cavity toward the mounting of electronic components by MW heating. We also developed a short-time melting technology for solder paste on polyimide substrate using MW heating and succeeded in mounting a temperature sensor using the novel MW heating system without damaging the electronic components, electronic circuits, and the substrate.

show abstract

“…As mentioned in Section III A, since the chopping and the compression cavity both operate at the fundamental and the second harmonic mode, a rectangular cavity is preferred. Research into power efficient RF cavity design, however, has mainly been done for pillbox cavities [26]. This is accomplished either through modifying the geometry of the cavity or through the introduction of dielectric material into the cavity, where the cylindrical symmetry somewhat simplifies the design process.…”

Section: B Cavity Feasibilitymentioning

confidence: 99%

Gigahertz repetition rate thermionic electron gun concept

Toonen

Stragier

Mutsaers

et al. 2019

Phys. Rev. Accel. Beams

View full text Add to dashboard Cite

We present a novel concept for the generation of gigahertz repetition rate high brightness electron bunches. A custom design 100 kV thermionic gun provides a continuous electron beam, with the current determined by the filament size and temperature. A 1 GHz rectangular RF cavity deflects the beam across a knife-edge, creating a pulsed beam. Adding a higher harmonic mode to this cavity results in a flattened magnetic field profile which increases the duty cycle to 30%. Finally, a compression cavity induces a negative longitudinal velocity-time chirp in a bunch, initiating ballistic compression. Adding a higher harmonic mode to this cavity increases the linearity of this chirp and thus decreases the final bunch length. Charged particle simulations show that with a 0.15 mm radius LaB6 filament held at 1760 K, this method can create 279 fs, 3.0 pC electron bunches with a radial rms core emittance of 0.089 mm mrad at a repetition rate of 1 GHz.

show abstract

Design and characterization of dielectric filled TM110 microwave cavities for ultrafast electron microscopy

Abstract: Microwave cavities oscillating in the TM 110 mode can be used as dynamic electronoptical elements inside an electron microscope. By filling the cavity with a dielectric

Cited by 17 publications

References 34 publications

Exploring Functional Materials by Understanding Beam‐Sample Interactions

Exploring Functional Materials by Understanding Beam‐Sample Interactions

Investigation of the Thermal Properties of Electrodes on the Film and Its Heating Behavior Induced by Microwave Irradiation in Mounting Processes

Gigahertz repetition rate thermionic electron gun concept

Contact Info

Product

Resources

About