Abstract
SHADOWS 1, 2 is an intended future beam dump experiment in the CERN North Area, aiming to search for feebly interacting particles (FIPs) 3 created in 400 GeV/c proton interactions. Due to ...its proposed off-axis location alongside the K12 beamline 4, the SHADOWS detector can be placed potentially very close to the beam dump, enabling it to search for FIPs in unexplored parts of the parameter space. In order to guarantee good quality of a potential signal, it is crucial to reduce any backgrounds of Standard Model particles as much as possible. The dominant background downstream the beam dump is caused by muons 1. This introduces the need of a dedicated muon sweeping system consisting of magnetised iron blocks (MIBs) to actively mitigate this background component. We present the conceptional design studies in the framework of the Conventional Beams Working Group of the Physics Beyond Colliders Initiative at CERN 5, 6.
The K12 beamline for the KLEVER experiment van Dijk, M W U; Banerjee, D; Bernhard, J ...
Journal of physics. Conference series,
11/2019, Letnik:
1350, Številka:
1
Journal Article
Recenzirano
Odprti dostop
The KLEVER experiment is proposed to run in the CERN ECN3 underground cavern from 2026 onward. The goal of the experiment is to measure BR(KL→π0vv¯), which could yield information about potential new ...physics, by itself and in combination with the measurement of BR(K+→π+vv¯) of NA62. A full description will be given of the considerations in designing the new K12 beamline for KLEVER, as obtained from a purpose made simulation with FLUKA. The high intensities required by KLEVER, 2 × 1013 protons on target every 16.8 s, with 5 × 1019 protons accumulated over 5 years, place stringent demands on adequate muon sweeping to minimize backgrounds in the detector. The target and primary dump need to be able to survive these demanding conditions, while respecting strict radiation protection criteria. A series of design choices will be shown to lead to a neutral beamline sufficiently capable of suppressing relevant backgrounds, such as photons generated by π0 decays in the target, and Λ → nπ0 decays, which mimic the signal decay.
Galaxy clusters and surrounding medium, can be studied using X-ray bremsstrahlung emission and Sunyaev Zel’dovich (SZ) effect. Both astrophysical probes, sample the same environment with different ...parameters dependance. The SZ effect is relatively more sensitive in low density environments and thus is useful to study the filamentary structures of the cosmic web. In addition, observations of the matter distribution require high angular resolution in order to be able to map the matter distribution within and around galaxy clusters. MISTRAL is a camera working at 90GHz which, once coupled to the Sardinia Radio Telescope (SRT), can reach 12″ angular resolution over 4′ field of view (f.o.v.). The forecasted sensitivity drives to a Noise Equivalent Flux Density of ≃ 10–15
mJy
√
s
and the mapping speed is MS = 380′
2
mJy
−2
h
−1
. MISTRAL was recently installed at the focus of the SRT and soon will take its first photons.
QUBIC Experiment Toward the First Light D’Alessandro, G.; Battistelli, E. S.; de Bernardis, P. ...
Journal of low temperature physics,
12/2022, Letnik:
209, Številka:
5-6
Journal Article
Recenzirano
Odprti dostop
The
Q
&
U
Bolometric Interferometer for Cosmology (QUBIC) is a cosmology experiment that aims to measure the B-mode polarization of the cosmic microwave background (CMB). Measurements of the ...primordial B-mode pattern of the CMB polarization are in fact among the most exciting goals in cosmology as it would allow testing of the inflationary paradigm. Many experiments are attempting to measure the B-modes, from the ground and the stratosphere, using imaging Stokes polarimeters. The QUBIC collaboration developed an innovative concept to measure CMB polarization using bolometric interferometry. This approach mixes the high sensitivity of bolometric detectors with the accurate control of systematics due to the interferometric layout of the instrument. We present the calibration results for the Technological Demonstrator, before its commissioning in the Argentinian observing site and preparation for first light.
An exploratory study has been launched at CERN in 2016 aiming at exploiting the full scientific potential of CERN’s accelerator complex and its scientific infrastructure through projects ...complementary to the LHC, HL-LHC and other possible future colliders. These projects will address possible experiments over the period from 2021 to about 2040. The role of the Conventional Beams Working Group (CBWG) is to study the technical feasibility of a multitude of proposals, particularly in the North Area of CERN. It is also to iterate the beam line performance together with the targeted physics reach and finally to estimate the resources required for changes to the beam lines and experimental areas. The studies assigned to the CBWG and their conclusions are detailed in this article.
Q & U Bolometric Interferometer for Cosmology (QUBIC) is an international ground-based experiment dedicated in the measurement of the polarized fluctuations of the Cosmic Microwave Background. It is ...based on bolometric interferometry, an original detection technique which combines the immunity to systematic effects of an interferometer with the sensitivity of low-temperature incoherent detectors. QUBIC will be deployed in Argentina, at the Alto Chorrillos mountain site near San Antonio de los Cobres, in the Salta Province. The QUBIC detection chain consists in 2048 NbSi transition edge sensors (TESs) cooled to 350 mK.The voltage-biased TESs are read out with time domain multiplexing based on Superconducting QUantum Interference Devices at 1 K and a novel SiGe application-specific integrated circuit at 60 K allowing to reach an unprecedented multiplexing factor equal to 128. The QUBIC experiment is currently being characterized in the laboratory with a reduced number of detectors before upgrading to the full instrument. I will present the last results of this characterization phase with a focus on the detectors and readout system.
QUBIC is a ground-based experiment aiming to measure the B-mode polarization of the cosmic microwave background. The developed instrument is an innovative two-frequency band bolometric interferometer ...that will operate at 300 mK with NbSi TES arrays. In this paper, we describe the fabrication process of the detectors.
The Q & U Bolometric Interferometer for Cosmology, QUBIC, is an innovative experiment designed to measure the polarization of the cosmic microwave background and in particular the signature left ...therein by the inflationary expansion of the Universe. The expected signal is extremely faint; thus, extreme sensitivity and systematic control are necessary in order to attempt this measurement. QUBIC addresses these requirements using an innovative approach combining the sensitivity of transition-edge sensor cryogenic bolometers, with the deep control of systematics characteristic of interferometers. This makes QUBIC unique with respect to others' classical imagers experiments devoted to the CMB polarization. In this contribution, we report a description of the QUBIC instrument including recent achievements and the demonstration of the bolometric interferometry performed in laboratory. QUBIC will be deployed at the observation site in Alto Chorrillos, in Argentina, at the end of 2019.
The Q&U Bolometric Interferometer for Cosmology (QL’BIC) is the first bolometric interferometer designed to measure the primordial
B
-mode polarization of the Cosmic Microwave Background (CMB). ...Bolometric interferometry is a novel technique that combines the sensitivity of bolometric detectors with the control of systematic effects that is typical of interferometry, both key features in the quest for the faint signal of the primordial
B
-modes. A unique feature is the so-called “spectral imaging”, i.e., the ability to recover the sky signal in several sub-bands within the physical band during data analysis. This feature provides an in-band spectral resolution of ∆
v
/
v
~ 0.04 that is unattainable by a traditional imager. This is a key tool for controlling the Galactic foregrounds contamination. In this paper, we describe the principles of bolometric interferometry, the current status of the QU BIC experiment and future prospects.
This was a prospective study performed at two tertiary referral teaching hospitals. The aim of our study was to investigate changes in urethral resistance with the bladder full compared to empty in ...women with different urodynamic diagnoses. Consecutive women attending the urodynamic clinics were asked to undergo urethral retro-resistance pressure (URP) measurement with the bladder empty and then full. 106 women were recruited - 25 had normal urodynamic studies, 17 had detrusor overactivity, 57 had urodynamic stress incontinence and 7 had mixed incontinence. Women with urodynamic stress incontinence have lower URP values than women with normal urodynamic studies or those with detrusor overactivity with the bladder empty (p = 0.01). Women with normal urodynamic studies and urodynamic stress incontinence showed a statistically significant rise in URP with the bladder full (p = 0.013 and p = 0.003, respectively). In women with detrusor overactivity, the converse was seen - URP was significantly lower with the bladder full compared to empty (p = 0.004). Our study has shown that bladder filling alters URP measurement and bladder volume should be standardised for reporting URP.
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