A5034609459- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Particle Detector Development and Performance
- Laser-Plasma Interactions and Diagnostics
- Gyrotron and Vacuum Electronics Research
- Magnetic confinement fusion research
- Particle physics theoretical and experimental studies
- Advanced X-ray Imaging Techniques
- Astronomical Observations and Instrumentation
- Plasma Diagnostics and Applications
- Advancements in Photolithography Techniques
- International Science and Diplomacy
- Nanofabrication and Lithography Techniques
- Acoustic Wave Resonator Technologies
- Advanced Measurement and Metrology Techniques
- Electron and X-Ray Spectroscopy Techniques
- Pulsed Power Technology Applications
- Photocathodes and Microchannel Plates
- Electromagnetic Compatibility and Measurements
- Atomic and Molecular Physics
- Experimental Learning in Engineering
- Analytical Chemistry and Sensors
- Muon and positron interactions and applications
- Full-Duplex Wireless Communications
European Organization for Nuclear Research
2015-2024
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2024
Campbell Collaboration
2022
Institute of Electrical and Electronics Engineers
2021
University of Catania
2021
Fermi National Accelerator Laboratory
2006-2014
Pohang TechnoPark (South Korea)
2010
Fermi Research Alliance
2007
Linac Coherent Light Source
2006
Menlo School
2006
The following topics are dealt with: TTF/FLASH in the XFEL context, general layout of facility, accelerator, undulators for SAES and spontaneous emission, photon beamlines scientific instruments, infrastructure auxiliary systems, commissioning operation, project management organization, cost time schedule. (HSI)
We show in experiments that a long, underdense, relativistic proton bunch propagating plasma undergoes the oblique instability, which we observe as filamentation. determine threshold value for ratio between transverse size and skin depth instability to occur. At threshold, outcome of experiment alternates filamentation self-modulation (evidenced by longitudinal modulation into microbunches). Time-resolved images density distribution reveal grows an observable level late along bunch,...
Plasma wakefield acceleration is a promising technology to reduce the size of particle accelerators. The use high energy protons drive wakefields in plasma has been demonstrated during Run 1 AWAKE programme at CERN. Protons 400 GeV drove that accelerated electrons 2 under 10 m plasma. collaboration now embarking on with main aims demonstrate stable accelerating gradients 0.5–1 GV/m, preserve emittance electron bunches and develop sources scalable 100s metres beyond. By end 2, scheme should...
Experimental results show that hosing of a long particle bunch in plasma can be induced by wakefields driven short, misaligned preceding bunch. Hosing develops the plane misalignment, self-modulation perpendicular plane, at frequencies close to electron frequency, and are reproducible. Development depends on misalignment direction, its growth extent proton charge. Results have main characteristics theoretical model, relevant other plasma-based accelerators represent first characterization...
A novel scheme for the focusing of high-energy leptons in future linear colliders was proposed 2001 [P. Raimondi and A. Seryi, Phys. Rev. Lett. 86, 3779 (2001)]. This has many advantageous properties over previously studied schemes, including being significantly shorter a given energy having better bandwidth. Experimental results from ATF2 accelerator at KEK are presented that validate operating principle such by demonstrating demagnification 1.3 GeV electron beam down to below 65 nm height...
A long, narrow, relativistic charged particle bunch propagating in plasma is subject to the self-modulation (SM) instability. We show that SM of a proton can be seeded by wakefields driven preceding electron bunch. timing reproducibility and control are at level small fraction modulation period. With this seeding method, we independently amplitude seed with charge growth rate Seeding leads larger than instability case.
We use a relativistic ionization front to provide various initial transverse wakefield amplitudes for the self-modulation of long proton bunch in plasma. show experimentally that, with sufficient amplitude [$\ensuremath{\ge}(4.1\ifmmode\pm\else\textpm\fi{}0.4)\text{ }\text{ }\mathrm{MV}/\mathrm{m}$], phase modulation along is reproducible from event event, 3%--7% (of $2\ensuremath{\pi}$) rms variations all bunch. The not lower amplitudes. observe transition between these two regimes. Phase...
Experiments at the FLASH facility DESY have demonstrated that higher order modes induced in superconducting cavities can be used to provide a variety of beam and cavity diagnostics. The axes determined from orbit produces minimum power dipole HOM modes. phase amplitude obtain high resolution position information, monopole measure relative accelerator rf. For most accelerators, existing mode couplers necessary signals, downmix digitizing electronics are straightforward, similar those for...
ATF2 is a final-focus test beam line which aims to focus the low emittance from ATF damping ring vertical size of about 37 nm and demonstrate nanometer level stability. Several advanced diagnostics feedback tools are used. In December 2008, construction installation were completed commissioning started, supported by an international team Asian, European, U.S. scientists. The present status first results described.
The CERN Linear Electron Accelerator for Research (CLEAR) has now finished its second year of operation, providing a testbed new accelerator technologies and versatile radiation source. Hosting varied experimental program, this beamline provides flexible test facility users both internal external to CERN, as well being an excellent physics training ground. energy can be between 60 220 MeV, bunch length 1 4 ps, charge in the range 10 pC 2 nC, number bunches 200, at repetition rate 0.8 Hz....
We exploit the coherent emission of Cherenkov diffraction radiation (ChDR) by a relativistic electron beam to sense its position even in presence other particle beams. ChDR is produced alumina inserts embedded vacuum chamber walls and recorded narrow band centered at 30 GHz. This nontrivial solution has been implemented for plasma wakefield accelerators, where be sensed can copropagate with another high-energy proton that generates wakefield. In addition, variance most existing detectors,...
The beam delivery system for the linear collider focuses beams to nanometer sizes at its interaction point, collimates halo provide acceptable background in detector and has a provision state-of-the art instrumentation order reach ILC's physics goals. This paper describes design details status of baseline configuration considered reference also lists alternatives.
The Project X Injector Experiment (PXIE), a test bed for the front end, will be completed at Fermilab FY12-16. One of challenging goals PXIE is demonstration capability to form 1 mA H- beam with an arbitrary selected bunch pattern from initially 5 162.5 MHz CW train. selection made in Medium Energy Beam Transport (MEBT) 2.1 MeV by diverting undesired bunches absorber. This paper presents MEBT scheme and describes development its elements, including kickers
The LHC Schottky beam diagnostic system has the potential to measure parameters such as tune, chromaticity and momentum spread in a non-invasive way. It does so by detecting induced signals at 4.8 GHz, extracting characteristic modulation caused incoherent motion of particles within bunch. was commissioned 2011 provided satisfactory beam-parameter measurements during Run I for lead-ions. However, protons its usability substantially limited due strong interfering common-mode signals. upgraded...
A capability to provide a large variety of bunch patterns is crucial for the concept Project X serving MW-range beam several experiments simultaneously. This will be realized by Medium Energy Beam Transport's (MEBT) chopping system that divert 80% all bunches initially 5mA, 2.1 MeV CW 162.5 MHz an absorber according pre-programmed bunch-by-bunch selection. Being considered one most challenging components, tested at Injector Experiment (PXIE) facility built Fermilab as prototype front end....
In this article, we briefly summarize the experiments performed during first Run of Advanced Wakefield Experiment, AWAKE, at CERN (European Organization for Nuclear Research). The final goal AWAKE 1 (2013 - 2018) was to demonstrate that \unit[10-20]{MeV} electrons can be accelerated GeV-energies in a plasma wakefield driven by highly-relativistic self-modulated proton bunch. We describe experiment, outline measurement concept and present results. Last, our plans future.
Self-modulation is a beam–plasma instability that useful to drive large-amplitude wakefields with bunches much longer than the plasma skin depth. We present experimental results showing that, when increasing ratio between initial transverse size of bunch and depth, occurs later along bunch, or not at all, over fixed length because amplitude decreases. show cases for which self-modulation does develop, we introduce simple model discussing conditions it would occur after any length. Changing...
Several state-of-the-art metrology measurement methods have been investigated and combined for a fiducialization of accelerator components in the micrometric regime. The PACMAN project at CERN applied stretched-wire to Compact Linear Collider quadrupole cavity beam position monitor prototypes, locate their magnetic, respectively, electromagnetic, axis using dedicated test stand determine wire with respect external alignment targets (fiducials) testing different methods, such as coordinate...
The Advanced Superconducting Test Acccelerator (ASTA) is being constructed at Fermilab. existing New Muon Lab (NML) building converted for this facility. accelerator will consist of an electron gun, injector, beam acceleration section consisting 3 TTF-type or ILC-type cryomodules, multiple downstream beamlines testing diagnostics and conducting various tests, a high power dump. When completed, it envisioned that facility initially be capable generating 750-MeV with ILC intensity. An...
The beam alignment requirements for the next generation of lepton colliders have become increasingly challenging. As an example, three major collider components CLIC linear are as follows. Before first circulates, Beam Position Monitors (BPM), Accelerating Structures (AS)and quadrupoles will to be aligned up 10 μm w.r.t. a straight line over 200 m long segments, along 20 km linacs. PACMAN is study on Particle Accelerator Components' Metrology and Alignment Nanometre scale. It Innovative...
More than 60 beam position monitors (BPM) are installed along about 350m of beamline the Free Electron LASer in Hamburg (FLASH) at DESY. The room‐temperature part accelerator is equipped mainly with stripline monitors. In accelerating cryo‐modules there cavity and re‐entrant BPMs, which will not be discussed here. undulator machine button BPMs used. This area requires a single bunch resolution 10μm. electronics based on AM/PM normalization principle externally triggered. Single‐bunch...