F. Caspers, A. Mostacci, H. Tsutsui
In this paper we discuss longitudinal beam coupling impedance measurements performed with the coaxial wire method on a modified prototype of the SPS MKE kicker. The frequency dependent real and...
Proposal for a 3 MeV H¯ test facility in the PS South Hall (2006)
Bongardt, K, Caspers, F, Garoby, R, Küchler, D, Lombardi, A M, Mostacci, A, ...
A Traveling Wave Resonant Ring for Electron Cloud Studies (2004)
Iriso, U, Caspers, Friedhelm, Laurent, J M, Mostacci, A
Within the framework of the CERN program on electron cloud effects in accelerators, a coaxial multipacting test stand was built. In order to simulate bunched beam, the test stand is subjected to...
Bench Measurements of Low Frequency Transverse Impedance (2003)
Caspers, Friedhelm, Iriso-Ariz, U, Mostacci, A
For frequencies below 10 MHz the classical two wire transmission line method is subject to difficulties in sensitivity and measurement uncertainties. Thus for evaluation of the low frequency...
Caspers, Friedhelm, Mostacci, A, Iriso-Ariz, U
The classical 2 wire method is not suitable for high precision transverse impedance measurements on a homogeneous copper beampipe with non-circular cross-section due to measurement noise limitations...
Caspers, Friedhelm, Mostacci, A, Iriso-Ariz, U
The classical 2 wire method is not suitable for high precision transverse impedance measurements on a homogeneous copper beampipe with non-circular cross-section due to measurement noise limitations...
Design of a chopper line for the CERN SPL (2002)
Caspers, Friedhelm, Hanke, K, Lombardi, A M, Millich, Antonio, Mostacci, A, Paoluzzi, M, ...
The SPL (Superconducting Proton Linac), a 2.2 GeV linac for high-intensity applications under study at CERN, requires a fast chopping at low energy of the H . beam. The most stringent demands on the...
On trapped modes in the LHC recombination chambers (2002)
Brandt, D, Caspers, Friedhelm, Li, D, Migliorati, M, Mostacci, A, Palumbo, L, ...
The recombination chamber in LHC (Large Hadron Collider) allows the separated proton beams to merge into a common vacuum chamber surrounding the interaction points. It has been subject of thorough...
On trapped modes in the LHC recombination chambers: numerical and experimental results (2002)
Brandt, D, Caspers, Friedhelm, Li, D, Migliorati, M, Mostacci, A, Palumbo, L, ...
The recombination chamber in LHC (Large Hadron Collider) allows the separated proton beams to merge into a common vacuum chamber surrounding the interaction points. It has been subject of thorough...
RF test benches for electron cloud studies (2002)
Iriso-Ariz, U, Caspers, Friedhelm, Laurent, Jean Michel, Mostacci, A
In the framework of the CERN program on the electron cloud effects in existing and future accelerators, a coaxial multipacting test stand was built. It consists of a 100 mm diameter vacuum chamber...
Progress in the Design of the SPL, an $H ^{-}$ High-Intensity Linac at CERN (2002)
Bongardt, K, Caspers, Friedhelm, Frischholz, Hans, Gerigk, F, Lombardi, A M, Losito, R, ...
The SPL (Superconducting Proton Linac) is a 4 MW 2.2 GeV H- linac, intended to re-use most of the 352 MHz RF equipment from the decommissioned LEP machine. Injecting into the CERN PS, this linac...
Fast Chopper Structure for the CERN Superconducting Proton Linac (2002)
Caspers, Friedhelm, Mostacci, A, Kurennoy, S S
The SPL chopper is a travelling wave device, which deflects a slow beam (b = v/c = 0.08) by its transverse electric field. We discuss the chopper deflecting structure based on a meander line printed...
Beam-Wall interaction in the LHC liner (2001)
The beam pipe foreseen for the LHC is rather unconventional. To shield the cold bore of the magnets from the synchrotron radiation emitted by protons at 7 TeV, a beam screen (the so called "liner")...
Image Currents in Azimuthally Inhomogeneous Metallic Beam Pipes (2001)
Caspers, Friedhelm, Mostacci, A, Palumbo, L, Ruggiero, F
We consider an ultra-relativistic particle travelling on-axis in an infinitely long cylindrical metallic beam pipe with azimuthally varying conductivity. A semi-analytical solution, obtained by...
Image Currents in Azimuthally Inhomogeneous Metallic Beam Pipes (2001)
Caspers, Friedhelm, Mostacci, A, Palumbo, L, Ruggiero, F
We consider an ultra-relativistic particle travelling on-axis in an infinitely long cylindrical metallic beam pipe with azimuthally varying conductivity. A semi-analytical solution, obtained by...
Caspers, Friedhelm, Mostacci, A, Tsutsui, H
In this paper we discuss longitudinal beam coupling impedance measurements performed with the coaxial wire method on a modified prototype of the SPS MKE kicker. The frequency dependent real and...
Synchronous Waves in the LHC Beam Screen with Ribbed Surface (2000)
Migliorati, M, Mostacci, A, Palumbo, L, Ruggiero, F, Ugoli, S
The problem of the wake field generated by a relativistic particle travelling in a long beam tube with rough surface has been revisited by means of a standard theory based on the hybrid modes excited...
Brandt, D, Caspers, Friedhelm, Mostacci, A, Rinolfi, Louis, Ruggiero, F, Tsutsui, H, ...
In order to better understand the RF shielding properties of a thin resistive layer inside a ceramic vacuum chamber, an experimental set-up has been installed in the Electron Positron Accumulator...
Synchronous Waves in the LHC Beam Screen with Ribbed Surface (2000)
Migliorati, M, Mostacci, A, Palumbo, L, Ruggiero, F, Ugoli, S
The problem of the wake field generated by a relativistic particle travelling in a long beam tube with rough surface has been revisited by means of a standard theory based on the hybrid modes excited...
Energy Lost by a Particle Beam in a Lossy Coaxial Liner with Many Holes (1998)
In the framework of Bethe's modified theory we study the energy lost by a relativistic particle beam travelling in a coaxial liner with many holes, including the effect of attenuation in the coaxial...