scholarly journals Cathode-follower RF system for proton synchrotron and compressor rings

1996 ◽  
Vol 43 (5) ◽  
pp. 2512-2515 ◽  
Author(s):  
Y. Irie
Keyword(s):  
Proton Synchrotron ◽  
Rf System ◽  
Cathode Follower

Mitigation of intensity limitation in the CERN SPS using a double RF system

2019 ◽  
Vol 34 (36) ◽  
pp. 1942036
Author(s):  
J. Repond ◽  
M. Schwarz ◽  
E. Shaposhnikova
Keyword(s):  
Hadron Collider ◽  
Mitigation Measures ◽  
Bunch Length ◽  
Proton Synchrotron ◽  
Intensity Increase ◽  
Super Proton Synchrotron ◽  
Rf System ◽  
Rf Systems ◽  
Voltage Ratio ◽  
Beam Stability

The Super Proton Synchrotron (SPS) at CERN is the injector of the Large Hadron Collider (LHC). Multi-bunch instabilities limit the intensity of the beam that can be accelerated to 450 GeV in the SPS and transferred to the LHC. Without mitigation measures, the threshold of bunch intensity of the longitudinal instability is three times below the nominal bunch intensity of the LHC beam. The High Luminosity LHC project (HL-LHC), which requires a doubling of the nominal bunch intensity, relies on improvement of beam stability in the SPS. A fourth harmonic RF system allows, presently, to stabilize the beam up to nominal LHC intensity. It increases the synchrotron frequency spread inside the bunch, providing more efficient Landau damping of beam instability. However, nonlinearities of the synchrotron frequency distribution inside the bunch pose a limitation on bunch length. This paper explores possible intensity increase in the SPS by studying the effect on beam stability of the voltage ratio between two RF systems. The results are substantiated by beam measurements and particle-tracking simulations. An optimized voltage program of the second RF system during the cycle has been tested in operation and beam stability and the quality have been successfully improved.

scholarly journals Present Status of RF System for Medical Proton Synchrotron

2006 ◽  
Author(s):  
Z. Fang ◽  
K. Endo ◽  
K. Egawa ◽  
S. Yamanaka ◽  
T. Hirashima ◽  
...  
Keyword(s):  
Present Status ◽  
Proton Synchrotron ◽  
Rf System

Hybrid FSO/RF System Using Intelligent Power Control and Link Switching

2021 ◽  
pp. 1-1
Author(s):  
Song Song ◽  
Yejun Liu ◽  
Tianming Xu ◽  
Lei Guo
Keyword(s):  
Power Control ◽  
Rf System

scholarly journals Spectral index-flux relation for investigating the origins of steep decay in γ-ray bursts

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Samuele Ronchini ◽  
Gor Oganesyan ◽  
Marica Branchesi ◽  
Stefano Ascenzi ◽  
Maria Grazia Bernardini ◽  
...  
Keyword(s):  
Spectral Index ◽  
Proton Synchrotron ◽  
Relativistic Jets ◽  
Time Resolved ◽  
X Ray ◽  
Compact Binary ◽  
Internal Dissipation ◽  
Adiabatic Cooling ◽  
Alternative Scenarios ◽  
Steep Decay

Abstractγ-ray bursts (GRBs) are short-lived transients releasing a large amount of energy (1051 − 1053 erg) in the keV-MeV energy range. GRBs are thought to originate from internal dissipation of the energy carried by ultra-relativistic jets launched by the remnant of a massive star’s death or a compact binary coalescence. While thousands of GRBs have been observed over the last thirty years, we still have an incomplete understanding of where and how the radiation is generated in the jet. Here we show a relation between the spectral index and the flux found by investigating the X-ray tails of bright GRB pulses via time-resolved spectral analysis. This relation is incompatible with the long standing scenario which invokes the delayed arrival of photons from high-latitude parts of the jet. While the alternative scenarios cannot be firmly excluded, the adiabatic cooling of the emitting particles is the most plausible explanation for the discovered relation, suggesting a proton-synchrotron origin of the GRB emission.

First validation experiments of the prototype solid state RF system for IFMIF-DONES

2021 ◽  
Vol 168 ◽  
pp. 112396
Author(s):  
Cristina de la Morena ◽  
David Regidor ◽  
Daniel Iriarte ◽  
Francisco Sierra ◽  
Eduardo Ugarte ◽  
...  
Keyword(s):  
Solid State ◽  
Rf System ◽  
Validation Experiments
Sign in / Sign up

Export Citation Format

Share Document