Andriy Ushakov
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View article: Liquid metal-based polarized positron generation benchmark using the GEANT4 toolkit
Liquid metal-based polarized positron generation benchmark using the GEANT4 toolkit Open
In this work, we report simulation results for the positron yield and polarization of polarized electron beams incident on GaInSn and PbBi liquid metal targets. One of the proposed upgrades to 12 GeV CEBAF is the use of a continuous wave p…
View article: Polarized positrons at Ce\(^+\)BAF
Polarized positrons at Ce\(^+\)BAF Open
View article: Experimental testing of a modified active disturbance rejection control for microphonics reduction in a 9-cell TESLA superconducting cavity
Experimental testing of a modified active disturbance rejection control for microphonics reduction in a 9-cell TESLA superconducting cavity Open
This work shows the results obtained with a novel modified active disturbance rejection control (MADRC) algorithm when controlling the detuning of a 9-cell TESLA superconducting radio frequency cavity. This type of control is essential in …
View article: Positron beams for 12 GeV CEBAF
Positron beams for 12 GeV CEBAF Open
View article: Polarized positrons at Ce+BAF
Polarized positrons at Ce+BAF Open
View article: Concept of a Positron Source at Ce+BAF
Concept of a Positron Source at Ce+BAF Open
A concept of the Ce+BAF positron injector is presented. The positron activities are described and the results of e+ beam tracking and calculations of e+ polarizations are discussed.
View article: Capture Cavities for the CW Polarized Positron Source Ce+BAF
Capture Cavities for the CW Polarized Positron Source Ce+BAF Open
The initial design of the capture cavities for the continuous wave (CW) polarized positron beams at Jefferson Lab (Ce+BAF) is presented. A chain of standing wave multi-cell copper cavities inside a solenoid tunnel are selected to bunch/cap…
View article: Capture cavities for the CW polarized positron source Ce⁺BAF
Capture cavities for the CW polarized positron source Ce⁺BAF Open
The initial design of the capture cavities for a continuous wave (CW) polarized positron beam for the Continuous Electron Beam Accelerator Facility (CEBAF) upgrade at Jefferson Lab is presented. A chain of standing wave multi-cell copper c…
View article: Characterization of radiation damages to positron source materials
Characterization of radiation damages to positron source materials Open
The secondary beam production target at future positron sources at the Continuous Electron Beam Accelerator Facility (CEBAF), the International Linear Collider (ILC) or the Future Circular Collider (FCC), features unprecedented mechanical …
View article: Simulations of positron capture at Ce+BAF
Simulations of positron capture at Ce+BAF Open
We present an initial capture concept for the continuous wave (CW) polarized positron beam at the Continuous Electron Beam Accelerator Facility (CEBAF) upgrade at Jefferson Lab. This two-step concept is based on (1) the generation of brems…
View article: Simulations of Positron Capture at Ce+BAF
Simulations of Positron Capture at Ce+BAF Open
We present a capture concept for the continuous wave (CW) polarized positron injector for the Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Lab (Ce+BAF). This two-step concept is based on (1) the generation of bremsstr…
View article: Characterization and optimization of polarized and unpolarized positron production
Characterization and optimization of polarized and unpolarized positron production Open
The electron induced production of positrons is a multi-parameter problem which combines elementary physics processes with complex collection systems. The optimization of this technique for 120~MeV and 1000~MeV electron beam kinetic energi…
View article: Capture Cavities For The Cw Polarized Positron Source Ce<sup>+</sup>baf
Capture Cavities For The Cw Polarized Positron Source Ce<sup>+</sup>baf Open
The initial design of the capture cavities for the continuous wave (CW) polarized positron beams at Jefferson Lab (Ce + BAF) is presented. A chain of standing wave multi-cell copper cavities inside a solenoid tunnel are selected to improve…
View article: Positron Beams At Ce$^+$BAF
Positron Beams At Ce$^+$BAF Open
We present a scheme for the generation of a high polarization positron beam with continous wave (CW) bunch structure for the Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Laboratory (JLab). The positrons are created in…
View article: Positron beams at Ce+BAF
Positron beams at Ce+BAF Open
Positron beams would provide a new and meaningful probe for the experimental program at the Thomas Jefferson National Accelerator Facility (JLab). The JLab Positron Working Group, formed in 2018 and now with over 250 members from 75 instit…
View article: Evaluation of a high-power target design for positron production at CEBAF
Evaluation of a high-power target design for positron production at CEBAF Open
A source for polarized positron beams at the Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Lab is being designed. The Polarized Electrons for Polarized Positrons (PEPPo) concept is used to produce polarized e$^+$e$^-$-…
View article: Ce+BAF : Positron Beams at Jefferson Lab
Ce+BAF : Positron Beams at Jefferson Lab Open
Nuclear physics experiments requiring spin polarized positron beams are being proposed at the Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Laboratory. This workshop proceedings describes the framework for implementing…
View article: High Power Solid Target for Positron Source at CEBAF
High Power Solid Target for Positron Source at CEBAF Open
The progress in the development of a polarized positron injector for the Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Laboratory is presented. The polarized positron beam is generated by a high current polarized elect…
View article: Power Incident on the ILC Helical Undulator Walls
Power Incident on the ILC Helical Undulator Walls Open
An undulator-based positron source is proposed for the future International Linear Collider (ILC): the high-intense electron beam passes through a helical undulator to produce a multi-MeV circularly polarized photon beam before it is direc…
View article: Positron sources: from conventional to advanced accelerator\n concepts-based colliders
Positron sources: from conventional to advanced accelerator\n concepts-based colliders Open
Positron sources are the key elements for the future and current lepton\ncollider projects such as ILC, CLIC, SuperKEKB, FCC-ee, Muon Collider/LEMMA,\netc., introducing challenging critical requirements for high intensity and low\nemittanc…
View article: Photon Masks for the ILC Positron Source with 175 and 250 GeV Electron Drive Beam
Photon Masks for the ILC Positron Source with 175 and 250 GeV Electron Drive Beam Open
In the future the International Linear Collider (ILC), a helical undulator-based polarized positron source, is expected to be chosen. A high energy electron beam passes through a superconducting helical undulator in order to create circula…
View article: Design of Photon Masks for the ILC Positron Source
Design of Photon Masks for the ILC Positron Source Open
A long superconducting helical undulator is planned as baseline to produce polarized positrons at the International Linear Collider (ILC). To protect the undulator walls from synchrotron radiation, masks must be inserted along the undulato…
View article: Plasma Lenses: Possible alternative OMD at the ILC
Plasma Lenses: Possible alternative OMD at the ILC Open
In the baseline design of the International Linear Collider (ILC) an undulator-based source is foreseen for the positron source in order to match the physics requirements. The recently chosen first energy stage with sqrt(s)=250 GeV require…
View article: Energy Deposition due to Secondary Particles in The Helical Undulator\n Wall at ILC-250GeV
Energy Deposition due to Secondary Particles in The Helical Undulator\n Wall at ILC-250GeV Open
In the future, International Linear Collider (ILC), a helical undulator based\npolarized positron source is expected to be chosen. A high energy electron beam\npasses through a superconducting helical undulator in order to create\ncircular…
View article: Energy Deposition due to Secondary Particles in The Helical Undulator Wall at ILC-250GeV
Energy Deposition due to Secondary Particles in The Helical Undulator Wall at ILC-250GeV Open
In the future, International Linear Collider (ILC), a helical undulator based polarized positron source is expected to be chosen. A high energy electron beam passes through a superconducting helical undulator in order to create circularly …
View article: Status of the Control System for the Energy Recovery Linac BERLinPro at HZB
Status of the Control System for the Energy Recovery Linac BERLinPro at HZB Open
BERLinPro is an energy recovery linac (ERL) demonstrator project built at HZB. It features CW SRF technology for the low emittance, high brightness gun, the booster module and the recovery linac. Construction and civil engineering are most…
View article: Updated status of the undulator-based ILC positron source
Updated status of the undulator-based ILC positron source Open
The design of the positron source for the International Linear Collider (ILC) is still under discussion. The baseline design plans to use the high-energy electron beam for the positron production before it goes to the IP. The electrons pas…
View article: The Berlin Energy Recovery Linac Project BERLinPro - Status, Plans and Future Opportunities
The Berlin Energy Recovery Linac Project BERLinPro - Status, Plans and Future Opportunities Open
The Helmholtz-Zentrum Berlin is constructing the Energy Recovery Linac Prototype BERLinPro, a SRF based demonstration facility for the science and technology of ERLs for future high power, high brilliance electron beam applications. BERLin…
View article: Simulation of quench detection algorithms for Helmholtz Zentrum Berlin SRF cavities
Simulation of quench detection algorithms for Helmholtz Zentrum Berlin SRF cavities Open
The Helmholtz Zentrum Berlin is carrying out two accelerator projects which make use of high gradient Continuous Wave (CW) Superconducting Radiofrequency (SRF) cavities: bERLinPro and BESSY-VSR. In both projects, a prompt detection of a qu…
View article: Simulation of Quench Detection Algorithms for Helmholtz Zentrum Berlin SRF Cavities
Simulation of Quench Detection Algorithms for Helmholtz Zentrum Berlin SRF Cavities Open
The Helmholtz Zentrum Berlin is carrying out two accelerator projects which make use of high gradient SRF cavities: BERLinPro* and BESSY-VSR**. In both projects, a prompt detection of a quench is crucial to avoid damages in the cryomodules…