24 research outputs found
Real-time sextupole tuning for a long in-plane polarization at storage rings
A long in-plane beam polarization can be a desired feature for spin
measurement experiments in storage rings. The spin precession of the particles
within a beam can be controlled by means of the frozen spin method and beam
bunching via RF cavities, eventually yielding a polarization lifetime of
10--100 seconds. Previous studies have shown that it can be further improved by
sextupoles, which correct the second order effects related to the chromaticity
of the beam. However, sextupoles can require readjustment after slight changes
in ring parameters. This work presents a real-time sextupole tuning method that
relies on a feedback algorithm. It adjusts the sextupole strength during
storage, targeting a zero average radial spin component. Satisfying this
condition results in a longer polarization lifetime. Simulation studies show
that roughly determined feedback coefficients in this method work effectively
for a wide range of ring parameters, with practical field imperfections and
measurement errors taken into account. Alternatively, this technique can be
used to optimize sextupole strengths in a test run without intervening the
measurement.Comment: 9 pages, 14 figure
A hybrid ring design in the storage-ring proton electric dipole moment experiment
A new, hybrid design is proposed to eliminate the main systematic errors in
the frozen spin, storage ring measurement of the proton electric dipole moment.
In this design, electric bending plates steer the particles, and magnetic
focusing replaces electric. The magnetic focusing should permit simultaneous
clock-wise and counter-clock-wise storage to cancel systematic errors related
to the out-of-plane dipole electric field. Errors related to the quadrupole
electric fields can be eliminated by successive runs of magnetic focusing with
different strengths.Comment: 6 pages, 8 figure
Axion dark matter search using the storage ring EDM method
We propose using the storage ring EDM method to search for the axion dark
matter induced EDM oscillation in nucleons. The method uses a combination of B
and E-fields to produce a resonance between the spin precession frequency
and the background axion field oscillation to greatly enhance sensitivity to
it. An axion frequency range from Hz to 100 MHz can in principle be
scanned with high sensitivity, corresponding to an range of
GeV GeV, the breakdown scale of the global symmetry
generating the axion or axion like particles (ALPs)
Storage Ring Probes of Dark Matter and Dark Energy
We show that proton storage ring experiments designed to search for proton
electric dipole moments can also be used to look for the nearly dc spin
precession induced by dark energy and ultra-light dark matter. These
experiments are sensitive to both axion-like and vector fields. Current
technology permits probes of these phenomena up to three orders of magnitude
beyond astrophysical limits. The relativistic boost of the protons in these
rings allows this scheme to have sensitivities comparable to atomic
co-magnetometer experiments that can also probe similar phenomena. These
complementary approaches can be used to extract the micro-physics of a signal,
allowing us to distinguish between pseudo-scalar, magnetic and electric dipole
moment interactions.Comment: 19 pages, 7 figure
Electric dipole moments and the search for new physics
Static electric dipole moments of nondegenerate systems probe mass scales for
physics beyond the Standard Model well beyond those reached directly at high
energy colliders. Discrimination between different physics models, however,
requires complementary searches in atomic-molecular-and-optical, nuclear and
particle physics. In this report, we discuss the current status and prospects
in the near future for a compelling suite of such experiments, along with
developments needed in the encompassing theoretical framework.Comment: Contribution to Snowmass 2021; updated with community edits and
endorsement
Object-Spatial Visualization And Verbal Cognitive Styles, And Their Relation To Cognitive Abilities And Mathematical Performance
The present study investigated the object-spatial visualization and verbal cognitive styles among high school students and related differences in spatial ability, verbal-logical reasoning ability, and mathematical performance of those students. Data were collected from 348 students enrolled in Advanced Placement calculus courses at six high schools. Correlational analysis revealed that spatial ability, verbal-logical reasoning ability, and mathematical performance were significantly correlated with each other. High spatial visualizers had significantly higher spatial ability and mathematical performance scores than high object visualizers. No significant differences were found between verbalizers and high spatial visualizers in their verbal-logical reasoning ability and mathematical performance scores. Results provide support for the existence of two contrasting groups of visualizers with respect to their spatial ability
Hybrid ring design in the storage-ring proton electric dipole moment experiment
A new, hybrid design is proposed to eliminate the main systematic errors in the frozen spin, storage ring measurement of the proton electric dipole moment. In this design, electric bending plates steer the particles, and magnetic focusing replaces electric. The magnetic focusing should permit simultaneous clock-wise and counter-clock-wise storage to cancel systematic errors related to the out-of-plane dipole electric field. Errors related to the quadrupole electric fields can be eliminated by successive runs of magnetic focusing with different strengths. copy right.Published by the American Physical Societ