LINAC2016 - List of Authors (Schnase, A.)

Paper	Title	Page
MOPLR067	First High Power Tests at the 325 MHz RF Test Stand at GSI	287
	G. Schreiber, E. Plechov, J. Salvatore, B. Schlitt, A. Schnase, M. Vossberg GSI, Darmstadt, Germany
	A dedicated RF test stand for testing RF components and accelerating structures at 325 MHz has been put into operation at GSI. It allows testing the klystrons and circulators as well as the RFQ and the CH-acceleration cavities for the planned FAIR proton linac (p-Linac) and further cavity projects. The system integration has been completed and first high power tests with the CH prototype cavity were successfully performed. The operation parameters are 2 Hz repetition rate and 200 microseconds pulse length. Investigations on the critical path from wave guide to coaxial high power cavity coupler have been made. Performance measurements of the klystron, circulator and directional couplers with up to 2.8 MW on dummy load and the following conditioning process of the CH-prototype cavity with its coupled RF structures will be presented. Additionally the results of the conditioning of a ladder RFQ prototype are shown.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR067
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TUPLR053	Development and Measurements of a 325 MHz RFQ	578
SPWR026	use link to see paper's listing under its alternate paper code
	M. Schütt, M.A. Obermayer, U. Ratzinger IAP, Frankfurt am Main, Germany A. Schnase GSI, Darmstadt, Germany
	In order to have an inexpensive alternative to 4-Vane RFQs above 200 MHz, we study the possibilities of a Ladder-RFQ. The 325 MHz RFQ is designed to accelerate protons from 95 keV to 3.0 MeV according to the design parameters of the research program with cooled antiprotons at FAIR. This particular high frequency for an RFQ creates difficulties, which are challenging in developing a cavity, especially for 4-ROD RFQs, which dimensions become critically small with increasing the frequency. In order to define a satisfying geometrical configuration for this resonator, both from the RF and the mechanical point of view, different designs have been examined and compared. Very promising results were reached with a ladder type RFQ, which has been investigated since 2013. Due to its geometry, the manufacturing in terms of complexity, time and costs is more beneficial compared to welded accelerators. Furthermore, maintenance is easy to handle. The manufacturing, coppering and assembling of a 0.8 m prototype RFQ is finished. We present recent measurements of the RF-field including power measurements, frequency-tuning, field flatness as well as power measurements.
	Poster TUPLR053 [47.463 MB]
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR053
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THPLR025	Modernisation of the 10⁸ MHz RF Systems at the GSI UNILAC	898
	B. Schlitt, G. Eichler, S. Hermann, M. Hoerr, M. Mueh, S. Petit, A. Schnase, G. Schreiber, W. Vinzenz, J. Zappai GSI, Darmstadt, Germany
	A substantial modernisation of the RF systems at the 10⁸ MHz Alvarez type post-stripper section of the GSI heavy ion linac UNILAC was launched in 2014 to prepare the existing facility for the future FAIR operation. A new 1.8 MW RF cavity amplifier prototype for low duty-cycle operation (2 ms pulse length at 10 Hz repetition rate) based on the widely-used tetrode TH558SC was designed and built by THALES and is under commissioning. A call for tenders was started for a 150 kW solid state driver amplifier. An RF test bench for the amplifier prototypes is in preparation at GSI including new control racks, commercial grid power supplies, and a modern PLC system for amplifier control. The existing powerful 1 MVA anode power supplies will be reused and are also being equipped with new PLC systems. The development of a digital low-level RF system based on the MTCA.4 standard and commercial vector modulator and FPGA boards was started. Status and details of the modernisation as well as first commissioning results of the new high power amplifier prototype will be reported.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR025
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

First High Power Tests at the 325 MHz RF Test Stand at GSI

287

G. Schreiber, E. Plechov, J. Salvatore, B. Schlitt, A. Schnase, M. Vossberg
GSI, Darmstadt, Germany

A dedicated RF test stand for testing RF components and accelerating structures at 325 MHz has been put into operation at GSI. It allows testing the klystrons and circulators as well as the RFQ and the CH-acceleration cavities for the planned FAIR proton linac (p-Linac) and further cavity projects. The system integration has been completed and first high power tests with the CH prototype cavity were successfully performed. The operation parameters are 2 Hz repetition rate and 200 microseconds pulse length. Investigations on the critical path from wave guide to coaxial high power cavity coupler have been made. Performance measurements of the klystron, circulator and directional couplers with up to 2.8 MW on dummy load and the following conditioning process of the CH-prototype cavity with its coupled RF structures will be presented. Additionally the results of the conditioning of a ladder RFQ prototype are shown.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR067

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPLR053

Development and Measurements of a 325 MHz RFQ

578

SPWR026

use link to see paper's listing under its alternate paper code

M. Schütt, M.A. Obermayer, U. Ratzinger
IAP, Frankfurt am Main, Germany
A. Schnase
GSI, Darmstadt, Germany

In order to have an inexpensive alternative to 4-Vane RFQs above 200 MHz, we study the possibilities of a Ladder-RFQ. The 325 MHz RFQ is designed to accelerate protons from 95 keV to 3.0 MeV according to the design parameters of the research program with cooled antiprotons at FAIR. This particular high frequency for an RFQ creates difficulties, which are challenging in developing a cavity, especially for 4-ROD RFQs, which dimensions become critically small with increasing the frequency. In order to define a satisfying geometrical configuration for this resonator, both from the RF and the mechanical point of view, different designs have been examined and compared. Very promising results were reached with a ladder type RFQ, which has been investigated since 2013. Due to its geometry, the manufacturing in terms of complexity, time and costs is more beneficial compared to welded accelerators. Furthermore, maintenance is easy to handle. The manufacturing, coppering and assembling of a 0.8 m prototype RFQ is finished. We present recent measurements of the RF-field including power measurements, frequency-tuning, field flatness as well as power measurements.

Poster TUPLR053 [47.463 MB]

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR053

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPLR025

Modernisation of the 10⁸ MHz RF Systems at the GSI UNILAC

898

B. Schlitt, G. Eichler, S. Hermann, M. Hoerr, M. Mueh, S. Petit, A. Schnase, G. Schreiber, W. Vinzenz, J. Zappai
GSI, Darmstadt, Germany

A substantial modernisation of the RF systems at the 10⁸ MHz Alvarez type post-stripper section of the GSI heavy ion linac UNILAC was launched in 2014 to prepare the existing facility for the future FAIR operation. A new 1.8 MW RF cavity amplifier prototype for low duty-cycle operation (2 ms pulse length at 10 Hz repetition rate) based on the widely-used tetrode TH558SC was designed and built by THALES and is under commissioning. A call for tenders was started for a 150 kW solid state driver amplifier. An RF test bench for the amplifier prototypes is in preparation at GSI including new control racks, commercial grid power supplies, and a modern PLC system for amplifier control. The existing powerful 1 MVA anode power supplies will be reused and are also being equipped with new PLC systems. The development of a digital low-level RF system based on the MTCA.4 standard and commercial vector modulator and FPGA boards was started. Status and details of the modernisation as well as first commissioning results of the new high power amplifier prototype will be reported.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR025

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)