IBIC2013 - List of Keywords (rfq)

Paper	Title	Other Keywords	Page
MOPC03	Overview of the ESS-Bilbao Mobile Diagnostics Test Stand	ESS, emittance, diagnostics, transverse	45
	D. Belver, I. Arredondo, I. Bustinduy, P. Echevarria, J. Feuchtwanger, Z. Izaola, J. Ortega Mintegui, S. Varnasseri ESS Bilbao, Zamudio, Spain
	A MObile diagnostics Test Stand (MOTS) is being designed at ESS-Bilbao in order to characterize the beam at the end of the Radio Frequency Quadrupole (RFQ) at 3 MeV. Injection of the beam from the RFQ to the Drift Tube Linac (DTL) tank and acceleration up to 12 MeV is a sensitive operation in the accelerating chain. The output beam of the RFQ should be fully characterized and tuned to optimize this operation. To perform this characterization the MOTS is being designed with a set of diagnostics devices to measure also beam parameters after the Medium Energy Beam Transport (MEBT), and with minor modifications after the first tank of the DTL. The most important beam parameters that will be measured with the test stand are the beam current, the beam energy and the energy spread. Other important parameters are the beam emittance, the transverse beam position and the profile and bunch length. This contribution describes the beam properties that will be measured and the corresponding instrumentation devices, and presents a general layout of the MOTS.
	Poster MOPC03 [1.146 MB]

TUPC26	Beam-line Diagnostics at the Front End Test Stand (FETS), Rutherford Appleton Laboratory, Oxfordshire, UK	BPM, linac, emittance, ion-source	431
	G.E. Boorman, S.M. Gibson Royal Holloway, University of London, Surrey, United Kingdom G.E. Boorman, S.M. Gibson JAI, Egham, Surrey, United Kingdom R.T.P. D'Arcy, S. Jolly UCL, London, United Kingdom C. Gabor STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom S.R. Lawrie, A.P. Letchford STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
	The H⁻ ion source and beam-line at FETS will require the beam current and beam position to be continually monitored. Current transformer toroids will measure the beam current and beam position monitors (BPM) will determine the beam position. The ion source delivers pulses at a rate of 50Hz with a current up to 60mA, each pulse is 2ms long, and a 324MHz micro-bunch structure imposed by the radio frequency quadrapole (RFQ) accelerating structure. The toroid outputs will be acquired on a fast oscilloscope. The BPM design is still under consideration (shorted strip-line or button type) but the processing for both types is similar and has been designed, with simulated measurements made. Each BPM uses four pickups, at a frequency of 324MHz, which are mixed using RF electronics to an intermediate frequency of 10.125MHz. The resulting signals are then digitized at 40.500MHz and processed in an FPGA to produce the position and phase of the beam at each BPM location, with a precision of better than 100μm and 0.05rad. The measurements from the toroids and BPMs will be via EPICS servers at every pulse.
	Poster TUPC26 [0.660 MB]

WEPC02	Project PROMETHEUS: Design and Construction of a Radio Frequency Quadrupole at TAEK	ion, ion-source, quadrupole, diagnostics	652
	G. Turemen, B. Yasatekin Ankara University, Faculty of Sciences, Ankara, Turkey Y. Akgun, A. Alacakir, A.S. Bolukdemir, E. Durukan, H. Karadeniz, E. Recepoğlu TAEK, Ankara, Turkey E. Cavlan TOBB ETU, Ankara, Turkey M. Celik, Z. Sali Gazi University, Faculty of Arts and Sciences, Teknikokullar, Ankara, Turkey S. Erhan UCLA, Los Angeles, California, USA Ö. Mete UMAN, Manchester, United Kingdom G. Unel UCI, Irvine, California, USA
	The PROMETHEUS Project is ongoing for the design and development of a 4-vane radio frequency quadrupole (RFQ) with its H⁺ ion source, a low energy beam transport (LEBT) line and diagnostics section. The main goal of the project is to achieve the acceleration of the low energy ions up to 1.5 MeV by an RFQ (352 MHz) shorter than 2 m. A plasma ion source is being developed to produce a 20 keV, 1 mA H⁺ beam. Ion source, transmission and beam dynamics in the RFQ are discussed through simulation results. In addition, analytical studies were also performed resulting into an RFQ design code, DEMIRCI as discussed and presented here in comparison with various existing software. As a result of the simulations, beam transmission of 99% was achieved at 1.7 m downstream reaching energy of 1.5 MeV. As the first phase an Aluminum RFQ prototype, the so-called cold model, will be built for low power RF characterization. In this contribution the status of the project, design considerations, simulation results, the various diagnostics techniques and RFQ fabrication issues are discussed.
	Poster WEPC02 [25.664 MB]

WEPF09	Profile and Emittance Measurements at the CERN LINAC-4 3 MeV Test Stand	emittance, linac, transverse, CERN	826
	F. Zocca, E. Bravin, M. Duraffourg, G.J. Focker, D. Gerard, U. Raich, F. Roncarolo CERN, Geneva, Switzerland
	A new 160 MeV H⁻ Linac named Linac-4 will be built at CERN to replace the old 50 MeV proton Linac. The ion source, the 3 MeV RFQ and the medium energy transport (MEBT) hosting a chopper, have been commissioned in a dedicated test stand. Wire grids and wire scanners were used to measure the transverse beam profile and a slit/grid emittance meter was installed on a temporary test bench plugged at the RFQ and MEBT exit in different stages. The emittance meter slit was also used as a scanning scraper able to reconstruct the transverse profile by measuring the transmission with a downstream current transformer. On the same measurement bench, a spectrometer in conjunction with a wire grid allowed measuring the energy spread of the particles. This paper summarizes the measurement results that allowed characterizing the 3 MeV beam and discusses the present understanding of monitor performance.

WEPF26	Test Bench Experiments for Energy Measurement and Beam Loss of ESS-Bilbao	beam-losses, ion, ESS, diagnostics	876
	S. Varnasseri, I. Arredondo, D. Belver, P. Echevarria, M. Eguiraun ESS Bilbao, Zamudio, Spain
	Various test benches have been developed at ESS-Bilbao in order to characterize different beam diagnostics and control systems prior to their installation on various parts of the accelerator. One test bench includes time-of-flight (TOF) characterization for energy measurement using fast current transformers (FCT). Using FCTs for the TOF measurement would allow us to measure accurately the delay between two successive bunched or un-bunched beam pulses of low energy ions. The other test bench includes a beam loss monitoring and interlock system using ACCTs, cRIO and PXI chassis with some acquisition modules and optical fiber link which represent a complete system of beam loss detection, interlock logic and trigger signal transmission. Having an integration on the ACCT output also allows us to measure the beam charge at the location of monitoring. In the test benches the functionality of hardware and software, the logic and required signal specifications like rise time, jitters and delays are measured. An overview of test benches and their measurement results are reported in this paper.
	Poster WEPF26 [1.120 MB]

WEPF32	Measurement and Control of the Beam Energy for the SPIRAL2 Accelerator	pick-up, controls, SPIRAL2, linac	897
	W. Le Coz, C. Doutresssoulles, C. Jamet, G. Ledu, S. Loret, C. Potier de courcy GANIL, Caen, France
	The first part of the SPIRAL2 facility, which entered last year in the construction phase at GANIL in France, will be composed of an ion source, a deuteron/proton source, a RFQ and a superconducting linear accelerator delivering high intensities, up to 5 mA and 40 MeV for the deuteron beams. As part of the MEBT commissioning, the beam energy will be measured on the BTI (Bench of Intermediate Test) at the exit of the RFQ. At the exit of the LINAC, the system has to measure but also control the beam energy. The control consists in ensuring that the beam energy is under a limit by taking account of the measurement uncertainty. The energy is measured by a method of time of flight, the signal is captured by non-intercepting capacitive pick-ups. This paper presents also the results obtained in terms of uncertainties and dynamics of measures.

Paper

Title

Other Keywords

Page

MOPC03

Overview of the ESS-Bilbao Mobile Diagnostics Test Stand

ESS, emittance, diagnostics, transverse

45

D. Belver, I. Arredondo, I. Bustinduy, P. Echevarria, J. Feuchtwanger, Z. Izaola, J. Ortega Mintegui, S. Varnasseri
ESS Bilbao, Zamudio, Spain

A MObile diagnostics Test Stand (MOTS) is being designed at ESS-Bilbao in order to characterize the beam at the end of the Radio Frequency Quadrupole (RFQ) at 3 MeV. Injection of the beam from the RFQ to the Drift Tube Linac (DTL) tank and acceleration up to 12 MeV is a sensitive operation in the accelerating chain. The output beam of the RFQ should be fully characterized and tuned to optimize this operation. To perform this characterization the MOTS is being designed with a set of diagnostics devices to measure also beam parameters after the Medium Energy Beam Transport (MEBT), and with minor modifications after the first tank of the DTL. The most important beam parameters that will be measured with the test stand are the beam current, the beam energy and the energy spread. Other important parameters are the beam emittance, the transverse beam position and the profile and bunch length. This contribution describes the beam properties that will be measured and the corresponding instrumentation devices, and presents a general layout of the MOTS.

Poster MOPC03 [1.146 MB]

TUPC26

Beam-line Diagnostics at the Front End Test Stand (FETS), Rutherford Appleton Laboratory, Oxfordshire, UK

BPM, linac, emittance, ion-source

431

G.E. Boorman, S.M. Gibson
Royal Holloway, University of London, Surrey, United Kingdom
G.E. Boorman, S.M. Gibson
JAI, Egham, Surrey, United Kingdom
R.T.P. D'Arcy, S. Jolly
UCL, London, United Kingdom
C. Gabor
STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
S.R. Lawrie, A.P. Letchford
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom

The H⁻ ion source and beam-line at FETS will require the beam current and beam position to be continually monitored. Current transformer toroids will measure the beam current and beam position monitors (BPM) will determine the beam position. The ion source delivers pulses at a rate of 50Hz with a current up to 60mA, each pulse is 2ms long, and a 324MHz micro-bunch structure imposed by the radio frequency quadrapole (RFQ) accelerating structure. The toroid outputs will be acquired on a fast oscilloscope. The BPM design is still under consideration (shorted strip-line or button type) but the processing for both types is similar and has been designed, with simulated measurements made. Each BPM uses four pickups, at a frequency of 324MHz, which are mixed using RF electronics to an intermediate frequency of 10.125MHz. The resulting signals are then digitized at 40.500MHz and processed in an FPGA to produce the position and phase of the beam at each BPM location, with a precision of better than 100μm and 0.05rad. The measurements from the toroids and BPMs will be via EPICS servers at every pulse.

Poster TUPC26 [0.660 MB]

WEPC02

Project PROMETHEUS: Design and Construction of a Radio Frequency Quadrupole at TAEK

ion, ion-source, quadrupole, diagnostics

652

G. Turemen, B. Yasatekin
Ankara University, Faculty of Sciences, Ankara, Turkey
Y. Akgun, A. Alacakir, A.S. Bolukdemir, E. Durukan, H. Karadeniz, E. Recepoğlu
TAEK, Ankara, Turkey
E. Cavlan
TOBB ETU, Ankara, Turkey
M. Celik, Z. Sali
Gazi University, Faculty of Arts and Sciences, Teknikokullar, Ankara, Turkey
S. Erhan
UCLA, Los Angeles, California, USA
Ö. Mete
UMAN, Manchester, United Kingdom
G. Unel
UCI, Irvine, California, USA

The PROMETHEUS Project is ongoing for the design and development of a 4-vane radio frequency quadrupole (RFQ) with its H⁺ ion source, a low energy beam transport (LEBT) line and diagnostics section. The main goal of the project is to achieve the acceleration of the low energy ions up to 1.5 MeV by an RFQ (352 MHz) shorter than 2 m. A plasma ion source is being developed to produce a 20 keV, 1 mA H⁺ beam. Ion source, transmission and beam dynamics in the RFQ are discussed through simulation results. In addition, analytical studies were also performed resulting into an RFQ design code, DEMIRCI as discussed and presented here in comparison with various existing software. As a result of the simulations, beam transmission of 99% was achieved at 1.7 m downstream reaching energy of 1.5 MeV. As the first phase an Aluminum RFQ prototype, the so-called cold model, will be built for low power RF characterization. In this contribution the status of the project, design considerations, simulation results, the various diagnostics techniques and RFQ fabrication issues are discussed.

Poster WEPC02 [25.664 MB]

WEPF09

Profile and Emittance Measurements at the CERN LINAC-4 3 MeV Test Stand

emittance, linac, transverse, CERN

826

F. Zocca, E. Bravin, M. Duraffourg, G.J. Focker, D. Gerard, U. Raich, F. Roncarolo
CERN, Geneva, Switzerland

A new 160 MeV H⁻ Linac named Linac-4 will be built at CERN to replace the old 50 MeV proton Linac. The ion source, the 3 MeV RFQ and the medium energy transport (MEBT) hosting a chopper, have been commissioned in a dedicated test stand. Wire grids and wire scanners were used to measure the transverse beam profile and a slit/grid emittance meter was installed on a temporary test bench plugged at the RFQ and MEBT exit in different stages. The emittance meter slit was also used as a scanning scraper able to reconstruct the transverse profile by measuring the transmission with a downstream current transformer. On the same measurement bench, a spectrometer in conjunction with a wire grid allowed measuring the energy spread of the particles. This paper summarizes the measurement results that allowed characterizing the 3 MeV beam and discusses the present understanding of monitor performance.

WEPF26

Test Bench Experiments for Energy Measurement and Beam Loss of ESS-Bilbao

beam-losses, ion, ESS, diagnostics

876

S. Varnasseri, I. Arredondo, D. Belver, P. Echevarria, M. Eguiraun
ESS Bilbao, Zamudio, Spain

Various test benches have been developed at ESS-Bilbao in order to characterize different beam diagnostics and control systems prior to their installation on various parts of the accelerator. One test bench includes time-of-flight (TOF) characterization for energy measurement using fast current transformers (FCT). Using FCTs for the TOF measurement would allow us to measure accurately the delay between two successive bunched or un-bunched beam pulses of low energy ions. The other test bench includes a beam loss monitoring and interlock system using ACCTs, cRIO and PXI chassis with some acquisition modules and optical fiber link which represent a complete system of beam loss detection, interlock logic and trigger signal transmission. Having an integration on the ACCT output also allows us to measure the beam charge at the location of monitoring. In the test benches the functionality of hardware and software, the logic and required signal specifications like rise time, jitters and delays are measured. An overview of test benches and their measurement results are reported in this paper.

Poster WEPF26 [1.120 MB]

WEPF32

Measurement and Control of the Beam Energy for the SPIRAL2 Accelerator

pick-up, controls, SPIRAL2, linac

897

W. Le Coz, C. Doutresssoulles, C. Jamet, G. Ledu, S. Loret, C. Potier de courcy
GANIL, Caen, France

The first part of the SPIRAL2 facility, which entered last year in the construction phase at GANIL in France, will be composed of an ion source, a deuteron/proton source, a RFQ and a superconducting linear accelerator delivering high intensities, up to 5 mA and 40 MeV for the deuteron beams. As part of the MEBT commissioning, the beam energy will be measured on the BTI (Bench of Intermediate Test) at the exit of the RFQ. At the exit of the LINAC, the system has to measure but also control the beam energy. The control consists in ensuring that the beam energy is under a limit by taking account of the measurement uncertainty. The energy is measured by a method of time of flight, the signal is captured by non-intercepting capacitive pick-ups. This paper presents also the results obtained in terms of uncertainties and dynamics of measures.