Cigdem Ozkan Loch
A5071099515- Particle Accelerators and Free-Electron Lasers
- Advanced X-ray Imaging Techniques
- Crystallography and Radiation Phenomena
- Particle accelerators and beam dynamics
- Advancements in Photolithography Techniques
- Superconducting Materials and Applications
- Advanced Measurement and Metrology Techniques
- Advanced Optical Sensing Technologies
- Photonic and Optical Devices
- Image Processing Techniques and Applications
- Laser-induced spectroscopy and plasma
- Surface Roughness and Optical Measurements
- Radiation Detection and Scintillator Technologies
- Laser-Plasma Interactions and Diagnostics
- Medical Imaging Techniques and Applications
- Advanced Surface Polishing Techniques
- Nuclear Physics and Applications
- Radiation Therapy and Dosimetry
- Optical measurement and interference techniques
- Advanced Radiotherapy Techniques
- Photocathodes and Microchannel Plates
- X-ray Spectroscopy and Fluorescence Analysis
Paul Scherrer Institute
2015-2022
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 2018 on Aramis hard branch. In following sections we summarize various aspects of project, including design soft branches accelerator, results performance simulations, details photon beamlines experimental stations, our commissioning results.
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 architecture undulators, branch can operated different modes producing FEL beams unique characteristics ranging from attosecond pulse length to high-power modes. Further space has been reserved upgrades including modulators an external seeding better timing...
The SwissFEL Injector Test Facility operated at the Paul Scherrer Institute between 2010 and 2014, serving as a pilot plant testbed for development realization of SwissFEL, X-ray Free-Electron Laser facility under construction same institute. test consisted laser-driven rf electron gun followed by an S-band booster linac, magnetic bunch compression chicane diagnostic section including transverse deflecting cavity. It delivered bunches up to 200 pC charge 250 MeV beam energy repetition rate...
A transverse profile imager for ultrabright electron beams is presented, which overcomes resolution issues in present designs by observing the Scheimpflug imaging condition as well Snell-Descartes law of refraction scintillating crystal. Coherent optical transition radiation emitted highly compressed bunches on surface crystal directed away from camera, allowing to use monitor measurements suitable X-ray free lasers. The design has been verified ray tracing simulations, and angular...
SwissFEL is a x-rays free electron laser (FEL) driven by 5.8 GeV linac under construction at Paul Scherrer Institut. In SwissFEL, wire scanners (WSCs) will be complementary to view-screens for emittance measurements and routinely used monitor the transverse profile of beam during FEL operations. The WSC composed an in-vacuum beam-probe---motorized stepper motor---and out-vacuum pick-up signal. mechanical stability hardware has been characterized on test bench. particular, motor induced...
SwissFEL has a unique capability, among the normal conducting linac-based light sources, to simultaneously serve two separate undulator lines (Aramis and Athos) up machine repetition rate of 100 Hz using double bunch operation mode. It increases twice experiments throughput facility with modest additional investment. Two electron bunches spaced 28 ns apart are extracted from cathode by laser pulses individually controlled rates. The accelerated about 3 GeV in main linac same rf macropulse....
The Pencil Beam Scanning (PBS) technique in proton therapy uses fast magnets to scan the tumor volume rapidly. Changing energy allows changing layers third dimension, hence scanning same several times. PBS approach permits adapting speed and/or current modulate delivered dose. We built a simple prototype that measures dose distribution single step. active detection material consists of layer scintillating fibers (i.e., 1D) with an length 100 mm, width 18.25 and insignificant space (20 μm)...
At the x-ray free-electron laser SwissFEL, at Paul Scherrer Institute, Switzerland, beam loss monitors are used to determine positions along linear accelerator and protect critical elements such as undulator magnets from excess radiation. These integrated into machine protection system (MPS) allowing losses be limited by dynamically reducing repetition rate. This paper focuses on types of installed SwissFEL their function in protecting machine.
The advent of low-emittance synchrotron X-ray sources and free-electron lasers urges the development novel diagnostic techniques for measuring monitoring spatial source properties, especially sizes. This work introduces an beam property analyzer based on a multi-crystal diffraction geometry, including crystal-based monochromator Laue crystal in dispersive setting to monochromator. By flat transmitted profiles, system can provide simultaneous high-sensitivity characterization size,...
The Athos line will cover the photon energy range from 250 to 1900 eV and operate in parallel hard X-ray Aramis of SwissFEL. paper describe current layout FEL starting fast kicker magnet followed by dogleg transfer line, small linac 16 APPLE undulators. From there beam passes through photonics front end beamline optics before reaching experimental stations AMO FURKA. focus this contribution be on two bunch operation commissioning (two bunches same RF macropulse), which started 2018,...
Swiss Light Source (SLS) has been on-line since 2001. Although its performance meets the specifications, it still a potential to achieve better storage ring beam parameters. We explore two possible improvements. The first one is for lifetime. There are 480 rf buckets while normally 390 bunches stored. gap in filing pattern (90 empty buckets) held suppress ion instability. After many years of operation, however, vacuum condition much than that time when SLS was turned on. Hence shorten gap....
Abstract The advent of low-emittance synchrotron x-ray sources and free-electron lasers urges the development novel diagnostic techniques for measuring monitoring spatial source properties, especially sizes. This work introduces an beam property analyzer based on a multi-crystal diffraction geometry, including crystal-based monochromator Laue crystal in dispersive setting to monochromator. By flat transmitted profiles, system can provide simultaneous high-sensitivity characterization size,...