A. Rakhman
YOU?
Author Swipe
View article: Measuring short-range correlations and quasi-elastic cross sections in A(e,e') at x>1 and modest Q$^2$
Measuring short-range correlations and quasi-elastic cross sections in A(e,e') at x>1 and modest Q$^2$ Open
We present results from the Jefferson Lab E08-014 experiment, investigating short-range correlations (SRC) through measurements of absolute inclusive quasi-elastic cross sections and their ratios. This study utilized 3.356 GeV electrons sc…
View article: Laser Manipulation of H- Beams: a Snowmass 2022 White Paper
Laser Manipulation of H- Beams: a Snowmass 2022 White Paper Open
Future high-power (10 - 20 MW) hadron accelerators offer many unique opportunities for fundamental science and nuclear applications. With the completion of Proton Power Upgrade (PPU) at 2.8 MW [1] and European Spallation Source (ESS) at 5 …
View article: Laser-assisted charge exchange as an atomic yardstick for proton beam energy measurement and phase probe calibration
Laser-assisted charge exchange as an atomic yardstick for proton beam energy measurement and phase probe calibration Open
Laser-assisted charge exchange (LACE) is a novel scheme for injecting H- ions into proton rings. Lorentz stripping of H- ions into bare protons in magnetic dipoles is enabled by laser excitation that reduces the electron binding energy. We…
View article: Novel observation of isospin structure of short-range correlations in calcium isotopes
Novel observation of isospin structure of short-range correlations in calcium isotopes Open
Short Range Correlations (SRCs) have been identiffed as being responsible for the high momentum tail of the nucleon momentum distribution, n(k). Hard, short-range interactions of nucleon pairs generate the high momentum tail and imprint a …
View article: Probing for high momentum protons in $^4$He via the $^4He(e,e'p)X$ reaction
Probing for high momentum protons in $^4$He via the $^4He(e,e'p)X$ reaction Open
Experimental cross sections for the $^4He(e,e'p)X$ reaction up to a missing momentum of 0.632 GeV/$c$ at $x_B=1.24$ and $Q^2$=2(GeV/$c$)$^2$ are reported. The data are compared to Relativistic Distorted Wave Impulse Approximation(RDWIA) ca…
View article: Burst-Mode Ultraviolet Laser Pulses at Megawatt Peak Power in a Doubly-Resonant Enhancement Cavity
Burst-Mode Ultraviolet Laser Pulses at Megawatt Peak Power in a Doubly-Resonant Enhancement Cavity Open
We demonstrate power enhancement of burst-mode UV (355 nm) laser with 50 ps pulse width and 402.5 MHz repetition rate. Peak intracavity power of >1.5 MW has been achieved for bunches with 10 μs at 10 Hz rate in a doubly-resonant optical ca…
View article: Sequential Excitation Scheme for Laser Stripping of Hydrogen Ion Beams
Sequential Excitation Scheme for Laser Stripping of Hydrogen Ion Beams Open
Resonant laser excitation of the electron in a hydrogen atom is essential to achieve high-efficiency laser stripping of hydrogen ion (H⁻) beam. In the laser stripping experiments recently carried out at SNS, an ultra-violet (UV) laser was …
View article: Search for three-nucleon short-range correlations in light nuclei
Search for three-nucleon short-range correlations in light nuclei Open
We present new data probing short-range correlations (SRCs) in nuclei through the measurement of electron scattering off high-momentum nucleons in nuclei. The inclusive He-4/He-3 cross section ratio is observed to be both x and Q(2) indepe…
View article: Towards Operational Scalability for H⁻ Laser Assisted Charge Exchange
Towards Operational Scalability for H⁻ Laser Assisted Charge Exchange Open
The experimental development of H⁻ laser assisted charge exchange, a.k.a. laser stripping, has been ongoing at the SNS accelerator since 2006 in a three-phase approach. The first two phases associated with proof-of-principle and proof-of-p…
View article: The Proton Beam Imaging System Design for the Spallation Neutron Source Tungsten Target
The Proton Beam Imaging System Design for the Spallation Neutron Source Tungsten Target Open
A periscope based remote imaging system has been developed to for an in-situ viewing of high-energy proton beams on the rotating tungsten target in harsh radiation environment at the Spallation Neutron Source. The optical system design and…
View article: Burst-Mode UV Enhancement Cavity for Laser-Assisted Hydrogen Ion Beam Stripping at SNS
Burst-Mode UV Enhancement Cavity for Laser-Assisted Hydrogen Ion Beam Stripping at SNS Open
Recent success of laser-assisted charge exchange for 10 μs duration Hydrogen ion beams at SNS motivates laser development necessary for efficient stripping of 1.0 ms duration beam at full duty cycle. To overcome the laser power challenge, …
View article: Large-Mode Optical Cavity for UV Laser Power Recycling
Large-Mode Optical Cavity for UV Laser Power Recycling Open
A large-mode Fabry-Perot cavity has been developed for power enhancement of UV laser. Megawatt peak power has been realized inside the cavity through power recycling of 50ps/402.5MHz UV pulses operating in a 10μs/10Hz burst mode.
View article: Demonstration of High Efficiency Laser-Assisted H<sup>-</sup> Charge Exchange for Microsecond Duration Beams
Demonstration of High Efficiency Laser-Assisted H<sup>-</sup> Charge Exchange for Microsecond Duration Beams Open
Laser-assisted stripping is a novel approach to H- charge exchange that overcomes longstanding limitations associated with the traditional, foil-based method of producing high intensity, time structured beams of protons. This paper reports…
View article: Laser System Design and Operation for SNS H⁻ Beam Laser Stripping
Laser System Design and Operation for SNS H⁻ Beam Laser Stripping Open
Recently, a high-efficiency laser assisted hydrogen ion (H⁻) beam stripping was successfully carried out in the Spallation Neutron Source (SNS) accelerator. The experiment was not only an important step toward foil-less H⁻ stripping for ch…
View article: Rosenbluth Separation of the π[superscript 0] Electroproduction Cross Section
Rosenbluth Separation of the π[superscript 0] Electroproduction Cross Section Open
We present deeply virtual π[superscript 0] electroproduction cross-section measurements at x[subscript B] = 0.36 and three different Q[superscript 2] values ranging from 1.5 to 2 GeV[superscript 2], obtained from Jefferson Lab Hall A exper…
View article: The SNS Laser Stripping Injection Experiment and its Implications on Beam Accumulation
The SNS Laser Stripping Injection Experiment and its Implications on Beam Accumulation Open
The laser assisted H⁻ charge exchange concept is under development at the Spallation Neutron Source (SNS) as on option for replacing traditional carbon-based foil technology in future accelerators. A laser based stripping system has the po…
View article: Radiation-Resistant Fiber Optic Strain Sensors for SNS Target Instrumentation
Radiation-Resistant Fiber Optic Strain Sensors for SNS Target Instrumentation Open
Measurement of stresses and strains in the mercury target vessel of the Spallation Neutron Source (SNS) is important to understand the structural dynamics of the target. Owing to their compactness, easy system integration, and invulnerabil…
View article: Power Recycling of Burst-mode Laser Pulses for Laser Particle Interactions
Power Recycling of Burst-mode Laser Pulses for Laser Particle Interactions Open
A number of laser-particle interaction experiments such as the laser assisted hydrogen ion beam stripping or X-/γ-ray generations via inverse-Compton scattering involve light sources operating in a burst mode to match the temporal structur…
View article: Measurement of Parity-Violating Asymmetry in Electron-Deuteron Inelastic Scattering
Measurement of Parity-Violating Asymmetry in Electron-Deuteron Inelastic Scattering Open
Jefferson Lab-CEBAF. The parity-violating asymmetries between a longitudinally-polarized electron beam and an unpolarized deuterium target have been measured recently. The measurement covered two kinematic points in the deep inelastic scat…