A5049508770- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Advanced X-ray Imaging Techniques
- Gyrotron and Vacuum Electronics Research
- Electron and X-Ray Spectroscopy Techniques
- Photocathodes and Microchannel Plates
- Pulsed Power Technology Applications
- Superconducting Materials and Applications
- Advanced Materials Characterization Techniques
- Advancements in Photolithography Techniques
- Laser Design and Applications
- Ion-surface interactions and analysis
- Particle Detector Development and Performance
- Radiation Therapy and Dosimetry
- Crystallography and Radiation Phenomena
- Advanced Electron Microscopy Techniques and Applications
- Diamond and Carbon-based Materials Research
- Radiation Detection and Scintillator Technologies
- Scientific Measurement and Uncertainty Evaluation
- Semiconductor materials and devices
- Advanced Data Storage Technologies
- Nuclear Physics and Applications
- Plasma Diagnostics and Applications
- Vacuum and Plasma Arcs
- Laser-Matter Interactions and Applications
Paul Scherrer Institute
2006-2021
Deutsches Elektronen-Synchrotron DESY
1979-2008
Elettra-Sincrotrone Trieste S.C.p.A.
1989-2003
Vifor Pharma (Switzerland)
2002
The Paul Scherrer Institute is planning the construction of a hardx-ray free-electron laser, SwissFEL, by 2016, which will produce intense, ultrashort pulses transversely coherent radiation in wavelength range 0.1-7 nm, with future extensions to cover 0.08-30 nm.Special design considerations include (a) compact construction, compatible status national facility, (b) uniform 100 Hz repetition rate, well suited sample manipulations and detector readout, (c) flexible tuning electron beam energy...
An upgrade of the Swiss Light Source (SLS) is planned for 2021-2024 and includes exchange existing storage ring by a new one providing about 40-50 times lower emittance in user operation mode. This will extend performance SLS particular fields coherent imaging, full-field tomography, soft X-ray angle-resolved photoelectron spectroscopy resonant inelastic scattering. A science case conceptual design machine have been established. As summary these reports, novel lattice design, undulator...
Illumination of a ZrC needle with short laser pulses (16 ps, 266 nm) while high voltage (-60 kV, 2 ns, 30 Hz) are applied, produces photo-field emitted electron bunches. The electric field is and varies rapidly over the surface so that quantum efficiency (QE) near apex can be much higher than for flat photocathode due to Schottky effect. Up 150 pC (2.9 A peak current) have been extracted by emission from needle. effective emitting area has an estimated radius below 50 microm leading...
The authors explore the impact of femtosecond light pulses on field-emission properties single-gate molybdenum field-emitter arrays with nanometer scale tip apex. Despite small fraction emission area, we observed a single-photon photoelectric current from emitter tips top dc under irradiation 50fs laser at wavelength 800nm an external quantum efficiency up to ∼2×10−7 and ∼10−2. result indicates that metallic are promising for applications require high-brightness short electron beams.
The authors proposed a method to fabricate field emitter arrays with uniform apex diameters in tens of nanometer scale based on the molding technique and apply it molybdenum arrays. Apex diameter equal 23±5nm was observed 6×6 tip array by high-resolution scanning electron microscope. They also studied field-emission characteristics devices gate electrodes fabricated top self-aligned process. In single-gate devices, emission current up 20μA per negligible leak observed. gate-fabrication...
A $1\text{ }\AA{}$ x-ray free electron laser can be operated at 6 GeV provided a very high brightness beam. Therefore, Paul Scherrer Institute has initiated development of the low-emittance gun based on field emission. field-emitter array (FEA) is expected to deliver peak current while reducing source emittance levels close thermal limit. 100 keV test stand been designed in order gain experience with bunches emitted by pulsed FEAs, investigate compensation, and develop diagnostic procedures...
The authors studied the photoemission from molybdenum nanotip arrays with controlled apex curvatures by photoelectron microscopy and spectroscopy excited 10 ps visible laser pulses under dc electric field. While two-photon demonstrates enhancement of photoabsorption at sharp tip apex, spatially resolved analysis energy revealed anomalous distribution that is ascribed to field resultant barrier reduction apex. results show applicability study optical in field-emitter arrays.
The Swiss Light Source (SLS) at the Paul Scherrer Institute (PSI) consists of a turn key 100 MeV linac, novel type booster synchrotron and 12-TBA storage ring providing 5 nm-rad natural emittance 2.4 GeV, SLS project was approved by Government in Sept. 1997. By June 1999 building finished. Linac commissioning concluded April, resp. 2000. First beam stored Dec. 15, 2001 entered final phase: design current 400 mA reached, an excellent agreement lattice functions with calculations achieved...
ELETTRA is generally working in a multi-bunch filling mode which gives rise to an instability if parasitic higher order cavity (HOM) coupled oscillation mode. Longitudinal instabilities, even not destructive, are particular harmful for synchrotron light sources, since they increase the energy variation of beam and deteriorate this way quality spectrum instabilities cured by tuning temperatures four independent cavities. The effectiveness method has been verified monitoring SuperESCA...
Experimental and simulation results of an electron gun test facility, based on pulsed diode acceleration followed by a two-cell rf cavity at 1.5 GHz, are presented here. The main features this diode-rf combination are: high peak gradient in the (up to $100\text{ }\text{ }\mathrm{MV}/\mathrm{m}$) obtained without breakdown conditioning, cathode shape providing electrostatic focusing, in-vacuum solenoid focus beam between cavity. Although stand was initially developed for testing field emitter...
The properties of the electron source define ultimate limit beam quality in linear accelerators such as free lasers (FELs). goal is to develop an gun delivering emittance lower than current state art. Such a should reduce cost and size x-ray FEL (XFEL). In this article we present two concepts field emitter cathodes which could potentially produce low beam. first challenging parameter for cathode emit peak high 5 A. This minimum requirement XFEL concept from Paul Scherrer Institut...
A 100-MeV electron linac, used as a preinjector for 2-GeV booster synchrotron, is described. Three operating modes are possible: single-bunch mode with one RF-bucket (500 MHz) filled, multibunch 5 to 150 buckets and free laser which provides long pulse beam energy ranging from 30 75 MeV. The linac includes triode gun subharmonic chopper/prebuncher cavities, followed by five-band buncher two accelerating structures. Specifications on the current, emittance, spread require special care in...
We report on the feasibility and expected performance of a sub-picosecond X-ray source at Swiss Light Source (SLS), based electron-beam slicing method. This method has recently been demonstrated Advanced (ALS), using bending magnet to produce ultrafast optical pulses. To improve flux such for user experiments, we have studied its realization both in hard soft regime, employing small gap insertion devices (IDs) installed either one or two successive straight sections. The most favourable...
The development of an electron gun with the lowest possible emittance would help reduce total length and cost a free laser. Recent progress in vacuum microelectronics makes field emitter tips attractive technology to explore for high brightness sources. In order be good candidate low gun, emission cathodes must provide at least peak current, stability, homogeneity current state art this article, we report on voltage measurements commercially available samples both continuous pulsed mode....
One of the challenges actinic metrology tools for EUV lithography is availability light sources with high brightness, stability, and availability. In particular, patterned mask inspection on reticles considered an essential tool ecosystem it requires source brightness. We present design a compact accelerator-based producing radiation high-brightness applications in semiconductor industry. Our based well-established components principles. The specifications required achieved using short...