Present Status of RF System for Medical Proton Synchrotron

Proceedings of the 2005 Particle Accelerator Conference ◽

10.1109/pac.2005.1591407 ◽

2006 ◽

Cited By ~ 1

Author(s):

Z. Fang ◽

K. Endo ◽

K. Egawa ◽

S. Yamanaka ◽

T. Hirashima ◽

...

Keyword(s):

Present Status ◽

Proton Synchrotron ◽

Rf System

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Results of Measurements on a 50 MHz Cavity Driven by a 250 kW Power Amplifier and the Present Status of the RF System of the SIN Cyclotron

10.1063/1.2946397 ◽

1972 ◽

Cited By ~ 2

Author(s):

P. Lanz

Keyword(s):

Power Amplifier ◽

Present Status ◽

Rf System

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Very low output-impedance RF system for a proton synchrotron with low drive power requirements

IEEE Transactions on Nuclear Science ◽

10.1109/23.795805 ◽

1999 ◽

Vol 46 (5) ◽

pp. 1289-1293 ◽

Cited By ~ 1

Author(s):

Y. Irie ◽

S. Takano

Keyword(s):

Proton Synchrotron ◽

Output Impedance ◽

Drive Power ◽

Rf System

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Cathode-follower RF system for proton synchrotron and compressor rings

IEEE Transactions on Nuclear Science ◽

10.1109/23.539401 ◽

1996 ◽

Vol 43 (5) ◽

pp. 2512-2515 ◽

Cited By ~ 1

Author(s):

Y. Irie

Keyword(s):

Proton Synchrotron ◽

Rf System ◽

Cathode Follower

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

International Journal of Modern Physics A ◽

10.1142/s0217751x19420363 ◽

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.

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