7 research outputs found
First Results from a Broadband Search for Dark Photon Dark Matter in the to eV range with a coaxial dish antenna
We present first results from a dark photon dark matter search in the mass
range from 44 to 52 () using a
room-temperature dish antenna setup called GigaBREAD. Dark photon dark matter
converts to ordinary photons on a cylindrical metallic emission surface with
area and is focused by a novel parabolic reflector onto a horn
antenna. Signals are read out with a low-noise receiver system. A first data
taking run with 24 days of data does not show evidence for dark photon dark
matter in this mass range, excluding dark photon - photon mixing parameters
in this range at 90% confidence level. This surpasses
existing constraints by about two orders of magnitude and is the most stringent
bound on dark photons in this range below 49 eV.Comment: 7 pages, 4 figure
Recommended from our members
Analysis and Design of MEBT Beam Absorber for Project-X
A beam absorber is needed for a new high power accelerator to be built in Fermilab. It is called Project-X and should replace the existing linac and the 8 GeV Booster synchrotron. The beam absorber is part of the bunch-by-bunch chopper assigned to create an arbitrary bunch sequence required by experimental program. It will be located in the middle of the medium energy beam transport (MEBT) and has to remove the unnecessary bunches from the initially uniform bunch structure supplied by 2.1 MeV CW RFQ. At nominal RFQ beam current of 5 mA, the maximum power delivered to the beam absorber is about 10 kW. Beam optics requirements result in that the length allocated to the beam absorber is short ({approx}400 mm) and the beam size is small ({sigma}{approx}2mm). That yields high power density of the beam arriving to the absorber. The paper presents the thermal and mechanical analysis of one of proposed designs
Tuning of Multicell Superconducting Accelerating Cavities using Pressurized Balloons
Plastic tuning of multicell superconducting accelerating cavities is crucial
in the development cycle of cavities for particle accelerators. Cavities must
meet stringent requirements regarding the operating mode frequency, field
flatness, and eccentricity before lining them up in a cryomodule string. After
dressing bare cavities with helium vessels, the welded vessel prevents access
to individual cavity cells disallowing any further localized tuning. Currently,
there is no straightforward way to tune dressed cavities other than cutting the
vessel and then tuning the bare cavity and dressing it back, which would
significantly impact cost and schedule. In this paper, we present a novel
tuning technique for already jacketed cavities that is non-invasive and
cost-effective. The proposed scheme employs pressurized balloons to be
temporarily deployed inside the cavity as a means to localize mechanical
deformation in specific cells. The proposed tuning technique was successfully
utilized to recover a 9-cell 1.3 GHz tesla-style cavity
Recommended from our members
CW Room Temperature Re-Buncher for the Project X Front End
At Fermilab there is a plan to construct the Project X Injector Experiment (PXIE) facility - a prototype of the front end of the Project X, a multi-MW proton source based on superconducting linac. The construction and successful operations of this facility will validate the concept for the Project X front end, thereby minimizing the primary technical risk element within the Project. The room temperature front end of the linac contains an ion source, an RFQ accelerator and a Medium Energy Beam Transport (MEBT) section comprising a high bandwidth bunch selective chopper. The MEBT length is about 10 m, so three re-bunching CW cavities are used to support the beam longitudinal dynamics. The paper reports a RF design of the re-bunchers along with preliminary beam dynamic and thermal analysis of the cavities
Broadband solenoidal haloscope for terahertz axion detection
We introduce the Broadband Reflector Experiment for Axion Detection (BREAD) conceptual design and science program. This haloscope plans to search for bosonic dark matter across the
[
10
−
3
,
1
]
 
 
eV
([0.24, 240] THz) mass range. BREAD proposes a cylindrical metal barrel to convert dark matter into photons, which a novel parabolic reflector design focuses onto a photosensor. This unique geometry enables enclosure in standard cryostats and high-field solenoids, overcoming limitations of current dish antennas. A pilot
0.7
 
 
m
2
barrel experiment planned at Fermilab is projected to surpass existing dark photon coupling constraints by over a decade with one-day runtime. Axion sensitivity requires
<
10
−
20
 
 
W
/
√
Hz
sensor noise equivalent power with a 10 T solenoid and
10
 
 
m
2
barrel. We project BREAD sensitivity for various sensor technologies and discuss future prospects
Broadband Solenoidal Haloscope for Terahertz Axion Detection
We introduce the Broadband Reflector Experiment for Axion Detection (BREAD) conceptual design and science program. This haloscope plans to search for bosonic dark matter across the [10^{-3},1]  eV ([0.24, 240] THz) mass range. BREAD proposes a cylindrical metal barrel to convert dark matter into photons, which a novel parabolic reflector design focuses onto a photosensor. This unique geometry enables enclosure in standard cryostats and high-field solenoids, overcoming limitations of current dish antennas. A pilot 0.7  m^{2} barrel experiment planned at Fermilab is projected to surpass existing dark photon coupling constraints by over a decade with one-day runtime. Axion sensitivity requires <10^{-20}  W/sqrt[Hz] sensor noise equivalent power with a 10 T solenoid and 10  m^{2} barrel. We project BREAD sensitivity for various sensor technologies and discuss future prospects