Publications (19)
Status report of the CERN light shining through the wall experiment with microwave axions and related aspects
M. Betz, F. Caspers, M. Gasior +1
One way to proof or exclude the existence of axion like particles is a microwave light shining through the wall experiment. In this publication we will emphasize on the engineering…
Daily modulations and broadband strategy in axion searches. An application with CAST-CAPP detector
F. Caspers, C. M. Adair, K. Altenmüller +60
It has been previously advocated that the presence of the daily and annual modulations of the axion flux on the Earth's surface may dramatically change the strategy of the axion se…
A new upper limit on the axion-photon coupling with an extended CAST run with a Xe-based Micromegas detector
CAST Collaboration, K. Altenmüller, V. Anastassopoulos +62
Hypothetical axions provide a compelling explanation for dark matter and could be emitted from the hot solar interior. The CERN Axion Solar Telescope (CAST) has been searching for…
First results of the CAST-RADES haloscope search for axions at 34.67 eV
A. Ãlvarez Melcón, S. Arguedas Cuendis, J. Baier +56
We present results of the Relic Axion Dark-Matter Exploratory Setup (RADES), a detector which is part of the CERN Axion Solar Telescope (CAST), searching for axion dark matter in t…
Progress with the Upgrade of the SPS for the HL-LHC Era
B. Goddard, T. Argyropoulos, H. Bartosik +28
The demanding beam performance requirements of the High Luminosity (HL-) LHC project translate into a set of requirements and upgrade paths for the LHC injector complex. In this pa…
Dependence of e-cloud on the longitudinal bunch profile: studies in the PS & extension to the HL-LHC
C. M. Bhat, H. Damerau, S. Hancock +5
Recent studies have shown that the prospects for significantly increasing bunch intensities in the LHC for the luminosity upgrade (HL-LHC) may be severely limited by the available…
RF engineering basic concepts: S-parameters
F. Caspers
The concept of describing RF circuits in terms of waves is discussed and the S-matrix and related matrices are defined. The signal flow graph (SFG) is introduced as a graphical mea…
Status report and first results of the microwave LSW experiment at CERN
M. Betz, F. Caspers, M. Gasior +1
To detect or exclude the existence of hidden sector photons or axion like particles, a table-top "microwaves shining through the wall" experiment has been set up at CERN. An overvi…
RF engineering basic concepts: the Smith chart
F. Caspers
The Smith chart is a very valuable and important tool that facilitates interpretation of S-parameter measurements. This paper will give a brief overview on why and more importantly…
Status report of the CERN microwave axion experiment
M. Betz, F. Caspers, M. Gasior
"Light Shining Through the Wall" experiments can probe the existence of "axion like particles" through their weak coupling to photons. We have adapted such an experiment to the mic…
Search for Dark Matter Axions with CAST-CAPP
C. M. Adair, K. Altenmüller, V. Anastassopoulos +61
The CAST-CAPP axion haloscope, operating at CERN inside the CAST dipole magnet, has searched for axions in the 19.74 eV to 22.47 eV mass range. The detection concept follow…
Novel types of anti-ecloud surfaces
I. Montero, L. Aguilera, M. E. Dávila +9
In high power RF devices for space, secondary electron emission appears as the main parameter governing the multipactor effect and as well as the e-cloud in large accelerators. Cri…
Conceptual Design of the International Axion Observatory (IAXO)
E. Armengaud, F. T. Avignone, M. Betz +85
The International Axion Observatory (IAXO) will be a forth generation axion helioscope. As its primary physics goal, IAXO will look for axions or axion-like particles (ALPs) origin…
First results of the CERN Resonant WISP Search (CROWS)
M. Betz, F. Caspers, M. Gasior +2
The CERN Resonant WISP Search (CROWS) probes the existence of Weakly Interacting Sub-eV Particles (WISPs) like axions or hidden sector photons. It is based on the principle of an o…
RF Measurements of the New TOTEM Roman Pot
O. Berrig, N. Biancacci, F. Caspers +6
The TOTEM experiment has been designed to measure the total proton-proton cross section and to study the elastic and diffractive scattering at the LHC energy. The measurement requi…
First observation of two hyperfine transitions in antiprotonic He-3
S. Friedreich, D. Barna, F. Caspers +11
We report on the first experimental results for microwave spectroscopy of the hyperfine structure of antiprotonic He-3. Due to the helium nuclear spin, antiprotonic He-3 has a more…
A microwave paraphoton and axion detection experiment with 300 dB electromagnetic shielding at 3 GHz
M. Betz, F. Caspers
For the microwave equivalent of "light shining through the wall" (LSW) experiments, a sensitive microwave detector and very high electromagnetic shielding is required. The screenin…
Search for solar axions produced through the axion-electron coupling using a new GridPix detector at CAST
K. Altenmüller, V. Anastassopoulos, S. Arguedas-Cuendis +61
We present a search for solar axions produced through the axion-electron coupling using data from a novel 7-GridPix detector installed at the CERN Axion Solar Telescope…
RF measurements I: signal receiving techniques
F. Caspers
For the characterization of components, systems and signals in the RF and microwave range, several dedicated instruments are in use. In this paper the fundamentals of the RF-signal…