F. Marcellini
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View article: Review of the high field performance of normal-conducting, tuning-free RF technology developed at the Paul Scherrer Institute
Review of the high field performance of normal-conducting, tuning-free RF technology developed at the Paul Scherrer Institute Open
At the Paul Scherrer Institute (PSI) in Switzerland, a process for manufacturing normal-conducting, tuning-free travelling-wave (TW) accelerating structures has been developed over the past decade through a collaboration between the instit…
View article: Attosecond time-resolved measurements of electron and photon beams with a variable polarization X-band radiofrequency deflector at an X-ray free-electron laser
Attosecond time-resolved measurements of electron and photon beams with a variable polarization X-band radiofrequency deflector at an X-ray free-electron laser Open
X-ray free-electron lasers (FELs) are cutting-edge research instruments employed in multiple scientific fields capable of analyzing matter with unprecedented time and spatial resolutions. Time-resolved measurements of electron and photon b…
View article: Beam-based commissioning of a novel <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>X</mml:mi></mml:math>-band transverse deflection structure with variable polarization
Beam-based commissioning of a novel -band transverse deflection structure with variable polarization Open
Longitudinal electron-beam diagnostics play a critical role in the operation and control of x-ray free-electron lasers, which rely on parameters such as the current profile, the longitudinal phase space, or the slice emittance of the parti…
View article: Proof-of-principle <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>e</mml:mi><mml:mo>+</mml:mo></mml:msup></mml:math> source for future colliders
Proof-of-principle source for future colliders Open
The PSI Positron Production (P3 or P-cubed) experiment is a e+ source and capture system with the potential to increase by an order of magnitude the state-of-the-art e+ yield normalized to the drive linac energy, a highly desirable goal fo…
View article: The P$^3$ Experiment: A Positron Source Demonstrator for Future Lepton Colliders
The P$^3$ Experiment: A Positron Source Demonstrator for Future Lepton Colliders Open
The PSI Positron Production (P$^3$ or P-cubed) experiment is a demonstrator for a e+ source and capture system with potential to improve the state-of-the-art e+ yield by an order of magnitude. The experiment is driven by the FCC-ee injecto…
View article: Post-undulator beam measurements with PolariX TDS in SwissFEL
Post-undulator beam measurements with PolariX TDS in SwissFEL Open
Radiofrequency (RF) transverse deflection structures (TDSs) are fundamental time-resolved diagnostics in X-ray free-electron lasers. Two X-band TDSs with variable polarization of the deflecting force were recently installed after the undul…
View article: SwissFEL double bunch operation
SwissFEL double bunch operation Open
SwissFEL has a unique capability, among the normal conducting linac-based light sources, to simultaneously serve two separate undulator lines (Aramis and Athos) up to the machine repetition rate of 100 Hz using the double bunch operation m…
View article: Absolute charge measurements for ps-long bunches using a wall current monitor in linac-based free electron lasers
Absolute charge measurements for ps-long bunches using a wall current monitor in linac-based free electron lasers Open
Wall current monitors (WCMs) are devices used to measure the bunch charge or current profile of a charged particle beam. They are commonly perceived as absolute charge measurement devices, which is not really true, since the pickup respons…
View article: Experimental demonstration of two-color x-ray free-electron-laser pulses via wakefield excitation
Experimental demonstration of two-color x-ray free-electron-laser pulses via wakefield excitation Open
Several beam manipulation methods have been studied and experimentally demonstrated to generate x-ray multipulses in free-electron-laser (FEL) facilities, advancing the fields of material science, molecular physics, and photochemistry by e…
View article: Charge Measurements in SwissFEL and Results of an Absolute Charge Measurement Method
Charge Measurements in SwissFEL and Results of an Absolute Charge Measurement Method Open
A comparative measurement campaign of the beam charge was carried out at SwissFEL using the following instruments: Faraday-Cup (FC), Wall-Current-Monitor (WCM), Integrating-Current-Transformer (Bergoz Turbo-ICT-2) and the reference cavity …
View article: Novel <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>X</mml:mi></mml:math>-band transverse deflection structure with variable polarization
Novel -band transverse deflection structure with variable polarization Open
A collaboration between DESY, PSI and CERN has developed and built an advanced modular X-band transverse deflection structure (TDS) system with the new feature of providing variable polarization of the deflecting force. The prototype of th…
View article: The SwissFEL soft X-ray free-electron laser beamline: Athos
The SwissFEL soft X-ray free-electron laser beamline: Athos Open
The SwissFEL soft X-ray free-electron laser (FEL) beamline Athos will be ready for user operation in 2021. Its design includes a novel layout of alternating magnetic chicanes and short undulator segments. Together with the APPLE X architec…
View article: Beam Manipulation Using Self-Induced Fields at the SwissFEL Injector
Beam Manipulation Using Self-Induced Fields at the SwissFEL Injector Open
In the past years wakefield sources have been used to manipulate electron beams in accelerators. We recently installed corrugated structures for a total length of 2~m at the SwissFEL injector to test novel schemes for beam manipulations. W…
View article: Status of Athos, the Soft X-Ray FEL Line of SwissFEL
Status of Athos, the Soft X-Ray FEL Line of SwissFEL Open
The Athos line will cover the photon energy range from 250 to 1900 eV and will operate in parallel to the hard X-ray line Aramis of SwissFEL. The paper will describe the current layout of the Athos FEL line starting from the fast kicker ma…
View article: The PolariX-TDS Project: Bead-Pull Measurements and High-Power Test on the Prototype
The PolariX-TDS Project: Bead-Pull Measurements and High-Power Test on the Prototype Open
A collaboration between DESY, PSI and CERN has been established to develop and build an advanced modular X- band transverse deflection structure (TDS) system with the new feature of providing variable polarization of the deflecting force. …
View article: Development of Modular Spare Parts for the Profile and Position Monitors of the 590 MeV Beam Line at HIPA
Development of Modular Spare Parts for the Profile and Position Monitors of the 590 MeV Beam Line at HIPA Open
A new generation of monitor plugs is under development for the ageing wire profile monitors and beam position monitors which are inserted into massive shielding of the 590 MeV proton beam line at HIPA. The modular mechanical design, aspect…
View article: Dielectric Waveguide-Based THz Radiator Study for SwissFEL
Dielectric Waveguide-Based THz Radiator Study for SwissFEL Open
THz pulses have many unique properties in terms of radiation matter interaction. In particular their non-ionizing excitation of phonons in matter makes them a preferred pump for pump-probe studies at free electron lasers. In order to enric…
View article: First Beam Commissioning Experience With The SwissFEL Cavity BPM System
First Beam Commissioning Experience With The SwissFEL Cavity BPM System Open
SwissFEL is free electron laser facility designed to produce FEL radiation at wavelengths from 0.1 to 5 nm. The beam commissioning of the hard X-ray undulator line ("Aramis") started 10/2016, and first lasing was observed in 12/2016. Prese…
View article: Consolidation and Extension of the High-gradient LINAC RF Technology at PSI
Consolidation and Extension of the High-gradient LINAC RF Technology at PSI Open
For SwissFEL a novel production process for high-gradient, high-precision C-band accelerating structures had been developed at PSI and was implemented for series production in collaboration with industry. The copper parts of the structures…
View article: SwissFEL: The Swiss X-ray Free Electron Laser
SwissFEL: The Swiss X-ray Free Electron Laser Open
The SwissFEL X-ray Free Electron Laser (XFEL) facility started construction at the Paul Scherrer Institute (Villigen, Switzerland) in 2013 and will be ready to accept its first users in 2018 on the Aramis hard X-ray branch. In the followin…
View article: Status of The European XFEL Transverse Intra Bunch Train Feedback System
Status of The European XFEL Transverse Intra Bunch Train Feedback System Open
The European XFEL (E-XFEL) will have a transverse intra bunch train feedback system (IBFB) that is capable of correcting the beam position of individual bunches in the ~650us long bunch train, with a minimal bunch spacing of 222ns. The IBF…
View article: Multimodal Interaction in the ALS Longitudinal Feedback Kicker RF Cavity
Multimodal Interaction in the ALS Longitudinal Feedback Kicker RF Cavity Open
RF cavities are essential components in particle accelerators not only for beam acceleration, but also for control purposes (bunch lengthening/shortening, deflecting and crabbing, transverse and longitudinal kickers) and for beam diagnosti…
View article: Status of The SwissFEL BPM System
Status of The SwissFEL BPM System Open
SwissFEL is a 5.8GeV free electron laser facility presently under construction at PSI. The electron beam position will be measured by three types of cavity beam position monitors. For the injector, linac and beam transfer lines, low-Q 3.3G…
View article: First Experimental Results with the CLIC Drive Beam Phase Feedforward Prototype at the CLIC Test Facility CTF3
First Experimental Results with the CLIC Drive Beam Phase Feedforward Prototype at the CLIC Test Facility CTF3 Open
The two-beam acceleration scheme envisaged for CLIC will require a high degree of phase stability between two beams at the drive beam decelerator sections, to allow efficient acceleration of the main beam. There will be up to 48 such decel…
View article: Demonstration of CLIC Level Phase Stability using a High Bandwidth, Low Latency Drive Beam Phase Feedforward System at the CLIC Test Facility CTF3
Demonstration of CLIC Level Phase Stability using a High Bandwidth, Low Latency Drive Beam Phase Feedforward System at the CLIC Test Facility CTF3 Open
The CLIC acceleration scheme, in which the RF power used to accelerate the main high energy beam is extracted from a second high intensity but low energy beam, places strict requirements on the phase stability of the power producing drive …
View article: Longitudinal injection scheme using short pulse kicker for small aperture electron storage rings
Longitudinal injection scheme using short pulse kicker for small aperture electron storage rings Open
Future light sources aim at achieving a diffraction limited photon beam both in the horizontal and vertical planes. High gradient quadrupoles and strong chromaticity correction sextupoles in a corresponding ultra-low emittance ring may res…
View article: First Results From Beam Tests of the CLIC Drive Beam Phase Feedforward Prototype at CTF3
First Results From Beam Tests of the CLIC Drive Beam Phase Feedforward Prototype at CTF3 Open
In the CLIC two beam acceleration scheme 100 MV/m normal conducting cavities are fed with RF power extracted from a secondary high power but low energy drive beam. To ensure the efficiency and luminosity performance of CLIC the phase synch…