LINAC2014 - List of Keywords (electronics)

Paper	Title	Other Keywords	Page
MOPP078	RF Power Systems for the FAIR Proton Linac	klystron, linac, proton, cavity	236
	J. Lesrel, C. Joly IPN, Orsay, France E. Plechov, A. Schnase, G. Schreiber, W. Vinzenz GSI, Darmstadt, Germany
	In the framework of collaboration between the FAIR project, GSI, and CNRS, the IPNO lab is in charge of providing the high power RF components for a cavity test stand and for the planned FAIR proton Linac. This Linac will be connected to the existing GSI synchrotron SIS18 for serving as an injector for the new FAIR facility. The 70 MeV FAIR proton Linac design contains a 3 MeV RFQ, and a DTL based on Cross-bar H-mode cavities (CH). It will operate with pulsed RF at 325.224 MHz with a width of 200 μs and a repetition rate of 4 Hz. The planned RF systems of the proton Linac will be presented as well as the description of the test stand. The first power test results are obtained with a Thales klystron developed jointly with CNRS. Three solid state amplifiers made by Sigmaphi Electronics for the bunchers will also be described in this paper.

MOPP107	Results from the Installation of a New 201 MHz RF System at LANSCE	DTL, cavity, controls, linac	303
	J.T.M. Lyles, C.L. Arnold, W.C. Barkley, J. Davis, A.C. Naranjo, M.S. Prokop, D. Rees, G. M. Sandoval, Jr. LANL, Los Alamos, New Mexico, USA D. Baca, R.E. Bratton, R.D. Summers Compa Industries, Inc., Los Alamos, New Mexico, USA
	Funding: Work supported by the United States Department of Energy, National Nuclear Security Agency, under contract DE-AC52-06NA25396. The LANSCE RM project is restoring the linac to it’s original high power capability after the power grid tube manufacturer could no longer provide triodes that could consistently meet our power requirements. High duty factor Diacrodes® now supply RF power to the largest DTL tank. These tetrodes reuse the existing infrastructure including water-cooling systems, coaxial transmission lines, high voltage power supplies and capacitor banks. The power amplifier system uses a combined pair of LANL-designed cavity amplifiers using the TH628L Diacrode® to produce as much as 3.5 MW peak and 420 kW of mean power. A digital low level RF control system was developed to complement these new linear amplifiers. Design and testing was completed in 2012, with commercialization following in 2013. The first installation is commissioned. The two remaining high power RF systems for tanks 3 and 4 will be replaced in subsequent years using a hybrid old/new RF system until the changeover is complete. Features and operating results of the replacement system are summarized, along with observations from the rapid-paced installation project.

TUPP041	Beam Current Monitor System of the European Spallation Source	FPGA, EPICS, linac, controls	526
	H. Hassanzadegan, M. Donna, A. Jansson, H. Kocevar, A. Nordt ESS, Lund, Sweden U. Legat Cosylab, Ljubljana, Slovenia M. Werner DESY, Hamburg, Germany
	The Beam Current Monitor system of the ESS will be primarily used for beam current and charge measurements in absolute and differential modes. Moreover, it will provide a fast input to the Beam Interlock System, initiating a trigger to shut the beam off upon high beam loss detection. As the BCM system will be needed at an early stage for Linac commissioning, it needs to work successfully under non-optimal conditions, ex. short pulse and low current beams. It is planned to install in total 20 AC Current Transformers and one Fast Current Transformer along the Linac. The FCT will have a larger bandwidth and it will be used to measure the performance of the fast chopper of the Medium Energy Beam Transport with a rise time of 10 ns. A prototype based on a commercial ACCT and EPICS-integrated MTCA.4 electronics has been set up and successfully tested with an emulated beam. The ACCT signal has been FPGA processed to compensate for the offset and droop as well as filtering and synchronization to an external trigger. This paper gives an overview of the design and test results of the prototype ACCT system with an outlook to future modifications before installation in the ESS Linac.
	Poster TUPP041 [6.113 MB]

THPP102	On Nonlinear Dynamics of a Sheet Electron Beam	emittance, plasma, electron, brightness	1090
	H.Y. Barminova MEPhI, Moscow, Russia
	In collisionless approximation the nonlinear dynamics of a charged particle beam is studied. Nonlinear oscillations of the beam radius appear due to external and self-consistent nonlinear forces. To study such oscillations the model is applied based on the kinetic distribution function dependent on the particle motion integrals. The 4th-order equation for the beam radius is obtained. The numerical solutions of the equation are analyzed. The cases of strong and weak nonlinearities caused by the own beam fields are discussed. In the case of weak deviation of the beam parameters from equilibrium ones the effective emittance growth isn't observed.

Paper

Title

Other Keywords

Page

MOPP078

RF Power Systems for the FAIR Proton Linac

klystron, linac, proton, cavity

236

J. Lesrel, C. Joly
IPN, Orsay, France
E. Plechov, A. Schnase, G. Schreiber, W. Vinzenz
GSI, Darmstadt, Germany

In the framework of collaboration between the FAIR project, GSI, and CNRS, the IPNO lab is in charge of providing the high power RF components for a cavity test stand and for the planned FAIR proton Linac. This Linac will be connected to the existing GSI synchrotron SIS18 for serving as an injector for the new FAIR facility. The 70 MeV FAIR proton Linac design contains a 3 MeV RFQ, and a DTL based on Cross-bar H-mode cavities (CH). It will operate with pulsed RF at 325.224 MHz with a width of 200 μs and a repetition rate of 4 Hz. The planned RF systems of the proton Linac will be presented as well as the description of the test stand. The first power test results are obtained with a Thales klystron developed jointly with CNRS. Three solid state amplifiers made by Sigmaphi Electronics for the bunchers will also be described in this paper.

MOPP107

Results from the Installation of a New 201 MHz RF System at LANSCE

DTL, cavity, controls, linac

303

J.T.M. Lyles, C.L. Arnold, W.C. Barkley, J. Davis, A.C. Naranjo, M.S. Prokop, D. Rees, G. M. Sandoval, Jr.
LANL, Los Alamos, New Mexico, USA
D. Baca, R.E. Bratton, R.D. Summers
Compa Industries, Inc., Los Alamos, New Mexico, USA

Funding: Work supported by the United States Department of Energy, National Nuclear Security Agency, under contract DE-AC52-06NA25396.
The LANSCE RM project is restoring the linac to it’s original high power capability after the power grid tube manufacturer could no longer provide triodes that could consistently meet our power requirements. High duty factor Diacrodes® now supply RF power to the largest DTL tank. These tetrodes reuse the existing infrastructure including water-cooling systems, coaxial transmission lines, high voltage power supplies and capacitor banks. The power amplifier system uses a combined pair of LANL-designed cavity amplifiers using the TH628L Diacrode® to produce as much as 3.5 MW peak and 420 kW of mean power. A digital low level RF control system was developed to complement these new linear amplifiers. Design and testing was completed in 2012, with commercialization following in 2013. The first installation is commissioned. The two remaining high power RF systems for tanks 3 and 4 will be replaced in subsequent years using a hybrid old/new RF system until the changeover is complete. Features and operating results of the replacement system are summarized, along with observations from the rapid-paced installation project.

TUPP041

Beam Current Monitor System of the European Spallation Source

FPGA, EPICS, linac, controls

526

H. Hassanzadegan, M. Donna, A. Jansson, H. Kocevar, A. Nordt
ESS, Lund, Sweden
U. Legat
Cosylab, Ljubljana, Slovenia
M. Werner
DESY, Hamburg, Germany

The Beam Current Monitor system of the ESS will be primarily used for beam current and charge measurements in absolute and differential modes. Moreover, it will provide a fast input to the Beam Interlock System, initiating a trigger to shut the beam off upon high beam loss detection. As the BCM system will be needed at an early stage for Linac commissioning, it needs to work successfully under non-optimal conditions, ex. short pulse and low current beams. It is planned to install in total 20 AC Current Transformers and one Fast Current Transformer along the Linac. The FCT will have a larger bandwidth and it will be used to measure the performance of the fast chopper of the Medium Energy Beam Transport with a rise time of 10 ns. A prototype based on a commercial ACCT and EPICS-integrated MTCA.4 electronics has been set up and successfully tested with an emulated beam. The ACCT signal has been FPGA processed to compensate for the offset and droop as well as filtering and synchronization to an external trigger. This paper gives an overview of the design and test results of the prototype ACCT system with an outlook to future modifications before installation in the ESS Linac.

Poster TUPP041 [6.113 MB]

THPP102

On Nonlinear Dynamics of a Sheet Electron Beam

emittance, plasma, electron, brightness

1090

H.Y. Barminova
MEPhI, Moscow, Russia

In collisionless approximation the nonlinear dynamics of a charged particle beam is studied. Nonlinear oscillations of the beam radius appear due to external and self-consistent nonlinear forces. To study such oscillations the model is applied based on the kinetic distribution function dependent on the particle motion integrals. The 4th-order equation for the beam radius is obtained. The numerical solutions of the equation are analyzed. The cases of strong and weak nonlinearities caused by the own beam fields are discussed. In the case of weak deviation of the beam parameters from equilibrium ones the effective emittance growth isn't observed.