Adam Bartnik
YOU?
Author Swipe
View article: Experimental Reconstruction of Source 4D Phase Space Without Prior Knowledge of Transfer Matrix
Experimental Reconstruction of Source 4D Phase Space Without Prior Knowledge of Transfer Matrix Open
We experimentally demonstrate a method for reconstructing the transverse 4D phase space of an electron beam at the time of emission from downstream diagnostics of the 4D phase space. This method does not rely on detailed knowledge of the b…
View article: Pulsed-laser lensing for phase modulation in electron microscopy
Pulsed-laser lensing for phase modulation in electron microscopy Open
Phase contrast electron microscopy is fundamental for visualizing unstained biological specimens. Advances in electron detection have not yet overcome the low contrast caused by weak scattering. Here, we demonstrate that an orthogonal puls…
View article: Progress in the development of an ultrafast pulsed ponderomotive phase plate for cryo-electron tomography
Progress in the development of an ultrafast pulsed ponderomotive phase plate for cryo-electron tomography Open
Cryo-electron tomography (cryo-ET) is a powerful modality for resolving cellular structures in their native state. While single-particle cryo-electron microscopy excels in determining protein structures purified from recombinant or endogen…
View article: Compensating slice emittance growth in high brightness photoinjectors using sacrificial charge
Compensating slice emittance growth in high brightness photoinjectors using sacrificial charge Open
Achieving maximum electron beam brightness in photoinjectors requires detailed control of the 3D bunch shape and precise tuning of the beam focusing. Even in state-of-the-art designs, slice emittance growth due to nonlinear space charge fo…
View article: Compensating slice emittance growth in high brightness photoinjectors using sacrificial charge
Compensating slice emittance growth in high brightness photoinjectors using sacrificial charge Open
Achieving maximum electron beam brightness in photoinjectors requires detailed control of the 3D bunch shape and precise tuning of the beam focusing. Even in state-of-the-art designs, slice emittance growth due to nonlinear space charge fo…
View article: Development of an ultrafast pulsed ponderomotive phase plate for cryo-electron tomography
Development of an ultrafast pulsed ponderomotive phase plate for cryo-electron tomography Open
Cryo-electron tomography (cryo-ET) is a powerful modality for resolving cellular structures in their native state. While single-particle cryo-electron microscopy (cryo-EM) excels in determining protein structures purified from recombinant …
View article: Towards Construction of a Novel Nanometer-Resolution MeV-STEM for Imaging Thick Frozen Biological Samples
Towards Construction of a Novel Nanometer-Resolution MeV-STEM for Imaging Thick Frozen Biological Samples Open
Driven by life-science applications, a mega-electron-volt Scanning Transmission Electron Microscope (MeV-STEM) has been proposed here to image thick frozen biological samples as a conventional Transmission Electron Microscope (TEM) may not…
View article: Towards construction of a novel nm resolution MeV-STEM for imaging of thick biological samples
Towards construction of a novel nm resolution MeV-STEM for imaging of thick biological samples Open
Driven by life-science applications, mega-electron-volt Scanning Transmission Electron Microscope (MeV-STEM) has been proposed to image thick biological samples. The high penetration of inelastic scattering signals of MeV electrons could m…
View article: Multi-scale time-resolved electron diffraction: A case study in moiré materials
Multi-scale time-resolved electron diffraction: A case study in moiré materials Open
View article: HERACLES: A high-voltage DC test beamline for high average current photocathodes
HERACLES: A high-voltage DC test beamline for high average current photocathodes Open
View article: Ultimate bunch length and emittance performance of an MeV ultrafast electron diffraction apparatus with a dc gun and a multicavity superconducting rf linac
Ultimate bunch length and emittance performance of an MeV ultrafast electron diffraction apparatus with a dc gun and a multicavity superconducting rf linac Open
We present the design of a high repetition rate MeV energy ultrafast electron diffraction instrument based on a dc photoelectron gun and an superconducting rf (SRF) linac with multiple independently controlled accelerating and bunching cav…
View article: Operation of Cs–Sb–O activated GaAs in a high voltage DC electron gun at high average current
Operation of Cs–Sb–O activated GaAs in a high voltage DC electron gun at high average current Open
Negative Electron Affinity (NEA) activated GaAs photocathodes are the most popular option for generating a high current (>1 mA) spin-polarized electron beam. Despite its popularity, a short operational lifetime is the main drawback of t…
View article: Four-dimensional emittance measurements of ultrafast electron diffraction optics corrected up to sextupole order
Four-dimensional emittance measurements of ultrafast electron diffraction optics corrected up to sextupole order Open
Ultrafast electron diffraction (UED) is a technique in which short-pulse electron beams can probe the femtosecond-scale evolution of atomic structure in matter driven far from equilibrium. As an accelerator physics challenge, UED imposes s…
View article: Operation of Cs-Sb-O activated GaAs in a high voltage DC electron gun at high average current
Operation of Cs-Sb-O activated GaAs in a high voltage DC electron gun at high average current Open
Negative Electron Affinity (NEA) activated GaAs photocathodes are the most popular option for generating a high current (> 1 mA) spin-polarized electron beam. Despite its popularity, a short operational lifetime is the main drawback of thi…
View article: Formy zasilania Neru wodami pościekowymi Aglomeracji Łódzkiej
Formy zasilania Neru wodami pościekowymi Aglomeracji Łódzkiej Open
W artykule przedstawiono wyniki badań zmian ilości wód pościekowych odprowadzanych
\nz Grupowej Oczyszczalni Ścieków Łódzkiej Aglomeracji Miejskiej (GOŚ-ŁAM) i wprowadzanych do Neru. Materiałem badawczym była unikalna seria dobowych odpływ…
View article: A kiloelectron-volt ultrafast electron micro-diffraction apparatus using low emittance semiconductor photocathodes
A kiloelectron-volt ultrafast electron micro-diffraction apparatus using low emittance semiconductor photocathodes Open
We report the design and performance of a time-resolved electron diffraction apparatus capable of producing intense bunches with simultaneously single digit micrometer probe size, long coherence length, and 200 fs rms time resolution. We m…
View article: Effect of Cavity Couplers Field on the Beam Dynamics of the LCLS-II Injector
Effect of Cavity Couplers Field on the Beam Dynamics of the LCLS-II Injector Open
LCLS-IIisanewlightsourcebasedonacontinuouswave (cw) superconducting linac to be built at SLAC. The Injector section of the linac creates the elecron beam and accelerates it up to about 100 MeV. The couplers of the accelerating cavities pro…
View article: A kiloelectron-volt ultrafast electron micro-diffraction apparatus using low emittance semiconductor photocathodes
A kiloelectron-volt ultrafast electron micro-diffraction apparatus using low emittance semiconductor photocathodes Open
We report the design and performance of a time-resolved electron diffraction apparatus capable of producing intense bunches with simultaneously single digit micron probe size, long coherence length, and $200$ fs rms time resolution. We mea…
View article: Ultimate bunch length and emittance performance of an MeV ultrafast electron diffraction apparatus with a DC gun and a multi-cavity SRF linac
Ultimate bunch length and emittance performance of an MeV ultrafast electron diffraction apparatus with a DC gun and a multi-cavity SRF linac Open
We present the design of a high repetition rate MeV energy ultrafast electron diffraction instrument based on a DC photoelectron gun and an SRF linac with multiple independently controlled accelerating and bunching cavities. The design is …
View article: <b>The influence of treated wastewater</b> from the Lodz city agglomeration on the ice regime and water temperature of the Ner river
<b>The influence of treated wastewater</b> from the Lodz city agglomeration on the ice regime and water temperature of the Ner river Open
The study attempts to answer the following question: Does human impact contribute to changes recorded in the Ner river ice regime? In replying to this question, data on water consumption in Lodz (Łódź) (a city in central Poland) in 1951–20…
View article: Technology Spinoff and Lessons Learned from the 4-Turn ERL CBETA
Technology Spinoff and Lessons Learned from the 4-Turn ERL CBETA Open
The Cornell-BNL ERL Test Accelerator (CBETA) developed several energy-saving measures: multi-turn energy recovery, low-loss superconducting radiofrequency (SRF) cavities, and permanent magnets. With green technology becoming imperative for…
View article: CBETA: First Multipass Superconducting Linear Accelerator with Energy Recovery
CBETA: First Multipass Superconducting Linear Accelerator with Energy Recovery Open
Energy recovery has been achieved in a multipass linear accelerator, demonstrating a technology for more compact particle accelerators operating at higher currents and reduced energy consumption. Energy delivered to the beam during the fir…
View article: Stable operation of a high-voltage high-current dc photoemission gun for the bunched beam electron cooler in RHIC
Stable operation of a high-voltage high-current dc photoemission gun for the bunched beam electron cooler in RHIC Open
The Low Energy RHIC Electron Cooling (LEReC) project at Brookhaven National Laboratory recently demonstrated for the first-time cooling of hadron bunches with radio-frequency (RF) accelerated electron bunches. LEReC uses a high-voltage pho…
View article: Ner. Monografia hydrologiczna niekochanej rzeki
Ner. Monografia hydrologiczna niekochanej rzeki Open
Prezentowana publikacja jest pierwszą tak szeroką i zwartą pracą na temat Neru. Dotyczy rzeki, której udział w historycznym rozwoju Łodzi i regionu łódzkiego był i jest ogromny, ale której zasoby wodne – zarówno pod względem ilościowym, ja…
View article: Essential Instrumentation for the Characterization of ERL Beams
Essential Instrumentation for the Characterization of ERL Beams Open
The typical requirement of Energy Recovery Linacs to produce beams with high repetition rate and high bunch charge presents unique demands on beam diagnostics. ERLs being quite sensitive to time of flight effects necessitate the use of bea…
View article: Multiannual variability of spring discharge in Southern Poland
Multiannual variability of spring discharge in Southern Poland Open
Discharge is one of the most important quantitative characteristics of springs.It not only specifies the yield of groundwater but also reflects the water retention conditions of the aquifer.An analysis of a long-term spring discharges enab…
View article: Beam Commissioning Results from the CBETA Fractional Arc Test (CBETA Note 030)
Beam Commissioning Results from the CBETA Fractional Arc Test (CBETA Note 030) Open
This work describes first commissioning results from the Cornell Brookhaven ERL Test Accelerator fractional arc test. These include the recommissioning of the Cornell photoinjector, the first full energy operation of the main linac with be…
View article: Equipment Protection System for CBETA
Equipment Protection System for CBETA Open
The ultimate goal of CBETA is to be the first high-current multi turn Energy Recovery Linac operating at 40 mA. The power of highest energy beam at this configuration is going to be 6 MW. Hence equipment protection against radiation is an …
View article: Beam Commissioning Results from the CBETA Fractional Arc Test
Beam Commissioning Results from the CBETA Fractional Arc Test Open
This work describes first commissioning results from the Cornell Brookhaven Energy Recovery Test Accelerator Fractional Arc Test. These include the recommissioning of the Cornell photo-injector, the first full energy operation of the main …
View article: CBETA - Novel Superconducting ERL
CBETA - Novel Superconducting ERL Open
We are successfully commissioning a unique Cornell University and Brookhaven National Laboratory Electron Recovery Linac (ERL) Test Accelerator ’CBETA’ [1]. The ERL has four accelerating passes through the supercon-ducting linac with a sin…