IPAC2014 - List of Keywords (DTL)

Paper	Title	Other Keywords	Page
TUPRO061	Benchmarking Beam Envelope Models for the European Spallation Source	simulation, dipole, linac, space-charge	1174
	I. List Cosylab, Ljubljana, Slovenia E. Laface ESS, Lund, Sweden
	TraceWin is used at the European Spallation Source (ESS) as the design tool, while fast and accurate on-line models will be needed during the operations. Three models are compared: the ESS Linac Simulator (ELS), TraceWin and the OpenXAL. In all of the benchmarked models, dynamics of each beam-line element is, to the first order, represented by a transfer matrix. Differences in the matrices occur, since different reference frames are used and as well different assumptions about the energy of the particles are made. General transformations of the reference frames will be presented. Using those, the comparison of transfer maps among TraceWin and OpenXAL are given. When the differences between TraceWin and OpenXAL were unclear, the benchmark versus other code, like MAD-X and Dynac was done. The best implementations were combined into a new on-line model implementation Java ELS (or JELS) and at last the comparison of the latter with TraceWin is given.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-TUPRO061
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WEPRO067	Development of NICA Injection Complex	ion, rfq, linac, ion-source	2103
	A.V. Butenko, E.E. Donets, A.D. Kovalenko, K.A. Levterov, A.O. Sidorin, G.V. Trubnikov JINR/VBLHEP, Moscow, Russia A. Belov RAS/INR, Moscow, Russia E.D. Donets, V.V. Fimushkin, A. Govorov, V. Kobets, V. Monchinsky JINR, Dubna, Moscow Region, Russia H. Höltermann, H. Podlech, U. Ratzinger, A. Schempp BEVATECH, Frankfurt, Germany T. Kulevoy, D.A. Liakin ITEP, Moscow, Russia S.M. Polozov MEPhI, Moscow, Russia
	The new accelerator complex Nuclotron-based Ion Collider fAcility (NICA) is assumed to operate using two linear accelerators: the Alvarez-type linac LU-20 as injector for light ions, polarized protons and deuterons and a new linac HILac for heavy ions. The new Booster and existing Nuclotron superconducting rings are the main parts of the injection complex of the NICA collider. The status of ion sources, both linacs and rings is presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRO067
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WEPRO075	The Conceptual Design of the China White Neutron Source	linac, neutron, rfq, resonance	2127
	J.H. Li, X.C. Ruan, X. Wang CIAE, Beijing, People's Republic of China J.H. Billen, K.R. Crandall TechSource, Los Alamos, New Mexico, USA J. Stovall ESS, Lund, Sweden J.Y. Tang IHEP, Beijing, People's Republic of China L.M. Young AES, Medford, New York, USA
	Funding: Work supported by NSFC of (91126003) In order to feed the nuclear data needs for design of the Chinese Accelerator Driven sub-critical System (CADS) and new generation nuclear energy systems, we plan to construct the China White Neutron Source (CWNS). The CWNS will be composed of a Proton Linac, an Accumulator Ring, a Target and Experimental Facilities. The linac is designed to deliver a proton beam having an average current of 1 mA at energy up to 300 MeV. The revolution frequency of the accumulator ring will be ~1.4 MHz. Two spallation targets are planned, with one for short pulsed modes and the other for micro-pulsed mode.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRO075
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WEPRO086	Experimental Activity in the ENEA-Frascati Irradiation Facility with 3-7 MeV Protons	proton, experiment, detector, linac	2156
	M. Vadrucci, A. Ampollini, F. Bonfigli, M.C. Carpanese, F. Marracino, R.M. Montereali, P. Nenzi, L. Picardi, M. Piccinini, C. Ronsivalle, V. Surrenti, M.A. Vincenti ENEA C.R. Frascati, Frascati (Roma), Italy F. Ambrosini URLS, Rome, Italy M. Balduzzi, C. Marino, C. Snels ENEA Casaccia, Roma, Italy M. Balucani, A. Klyshko University of Rome "La Sapienza", Rome, Italy C. De Angelis, G. Esposito, M.A. Tabocchini ISS, Rome, Italy
	A variable energy (3-7 MeV) and pulsed current (0.1 – 100 μA) proton beam has been made available for different applications (radiobiology experiments, detectors development, material studies) in an irradiation facility at ENEA-Frascati based on the 7 MeV injector of the protontherapy linac under realization in the framework of the TOP-IMPLART Project. It is a 425 MHz linear accelerator consisting in a 3 MeV RFQ followed by a DTL up to 7 MeV (PL-7 ACCSYS-HITACHI model) followed by an horizontal and a vertical beam transport line. The latter one is particularly suitable for radiobiology in vitro studies allowing to irradiate besides cell monolayes also cell growing in suspension culture. The paper describes the facility and the recent results of the experimental activity.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-WEPRO086
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THPME001	Commissioning and Operation of the MedAustron Injector: Results and Future Outlook	ion, rfq, ion-source, emittance	3202
	L.C. Penescu, M. Kronberger, T. Kulenkampff, F. Osmić, P. Urschütz EBG MedAustron, Wr. Neustadt, Austria W. Pirkl CERN, Geneva, Switzerland
	The MedAustron facility is a synchrotron-driven hadron therapy and research center presently under construction in Wiener Neustadt, Austria. In its final outline, the facility will provide H⁺ beams with kinetic energies ≤250MeV and C6+ beams of ≤400MeV/u for clinical applications, and for non-clinical applications H⁺ of up to 800MeV. First patient treatment is foreseen for the end of 2015. The (H3)+ and C4+ beams are generated at 8keV/u in continuous mode by three ECR ion sources and transported to the RFQ for acceleration to 400keV/u. An inter-tank section matches the beam to the entrance of an IH-mode DTL that accelerates the particles to 7MeV/u before they are stripped to, respectively, H⁺ and C6+, debunched and transported to the injection plane of the synchrotron. At a later stage of the project, beams of other species can be generated with similar optics. This contribution presents the results of the injector commissioning and operation. A comparison with the baseline optics and with the design error studies is given. In addition, an overview on the operational experience is given, with emphasis on the system reliability, stability and reproducibility.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME001
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THPME010	A 325 MHz High Gradient CH – Test Cavity for β=0.16	cavity, linac, operation, focusing	3229
	A. Almomani, U. Ratzinger IAP, Frankfurt am Main, Germany
	Funding: BMBF, contract no. 05P12RFRB9 This pulsed linac activity aims on compact designs, which means a considerable increase in voltage gain per meter. At IAP – Frankfurt, a CH – cavity was developed for these studies, where mean effective accelerating fields well above 10 MV/m are expected at 325 MHz, β=0.164. This cavity is developed within a funded project. Currently, the cavity is under construction and expected to be ready for copper plating in autumn 2014. The results might influence the rebuilt of the UNILAC – Alvarez section, which aims on achieving the beam intensities specified for the GSI – FAIR project. The new GSI 3 MW Thales klystron test stand will be very important for these investigations. Detailed investigations for two different types of copper plating can be performed on this cavity. In this work, the status of the cavity fabrication will be presented. Moreover, low temperature operation of copper cavities is discussed for the case of very short RF pulses.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME010
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THPME016	Experimental Results on SCDTL Structures for Protons	proton, beam-transport, coupling, rfq	3247
	L. Picardi, A. Ampollini, G. Bazzano, P. Nenzi, C. Ronsivalle, V. Surrenti, M. Vadrucci ENEA C.R. Frascati, Frascati (Roma), Italy F. Ambrosini URLS, Rome, Italy
	The medium-energy section of the proton linear accelerator for radiotherapy under realization in the framework of the TOP-IMPLART Project consists in a high frequency 7-35 MeV SCDTL (Side Coupled Drift Tube Linac) structure. The structure, made of 4 modules supplied by one klystron, has been completely designed. The first module up to 11.6 MeV has been built and is under commissioning at ENEA-Frascati and the second and third modules are under realization. The paper describes the system and presents the main results of the experimental activity on this part of the accelerator.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME016
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THPME041	ESS DTL Status: Redesign and Optimizations	emittance, linac, quadrupole, focusing	3314
	R. De Prisco, M. Eshraqi ESS, Lund, Sweden M. Comunian, F. Grespan, A. Pisent INFN/LNL, Legnaro (PD), Italy A.R. Karlsson Lund University, Lund, Sweden
	The European Spallation Source (ESS) uses a linear accelerator to deliver the high intensity proton beam to the target station. The average beam power is 5 MW with a peak beam power at target of 125 MW. In 2013 the ESS linac was costed and to meet the budget some modifications were introduced: the final energy was decreased from 2.5 GeV to 2.0 GeV and the beam current was increased from 50 mA to 62.5 mA to keep the same beam power. As a consequence the ESS Drift Tube Linac, DTL, has been re-designed to match the new requirements. This paper presents the main Radio Frequency (RF) and beam dynamics choices for the ESS DTL.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME041
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THPME044	Statistical Error Studies in the ESS Linac	rfq, linac, emittance, alignment	3323
	M. Eshraqi, R. De Prisco, R. Miyamoto, E. Sargsyan ESS, Lund, Sweden H.D. Thomsen ISA, Aarhus, Denmark
	Following the completion of the latest layout of the ESS linac statistical error studies have been performed to define the field vector quality and alignment tolerances. Based on these tolerances and error study results a scheme for the correction system is proposed that assures low losses and permits hands-on maintenance. This paper reports on the strategy of simulating and performing the error studies as well as setting the tolerances.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME044
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THPME045	Beam Physics Design of the ESS Medium Energy Beam Transport	linac, rfq, lattice, emittance	3326
	R. Miyamoto, B. Cheymol, M. Eshraqi ESS, Lund, Sweden I. Bustinduy ESS Bilbao, Bilbao, Spain
	A radio frequency quadrupole (RFQ) and drift tube linac (DTL) in the ESS proton linac are connected with a medium energy beam transport (MEBT) to remove low intensity bunches on the head and tail of a macro-pulse with a chopper and house diagnostic devices to characterize and adjust the beam out of the RFQ for the DTL. These must be achieved within a relatively short space and without large degradation of beam quality due to space charge force, imposing a challenge on the lattice design. This paper presents a beam physics design of the MEBT in the ESS proton linac, which satisfies its requirement while preserving a decent beam quality.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME045
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THPME049	TAC Proton Accelerator Facility: Normal Conducting Part	proton, ion-source, ion, linac	3335
	E. Algin Eskisehir Osmangazi University, Eskisehir, Turkey B. Akkus, L. Sahin Istanbul University, Istanbul, Turkey H. Cetinkaya Dumlupinar University, Faculty of Science and Arts, Kutahya, Turkey
	The Turkish Accelerator Center Proton Accelerator Facility (TAC PAF) based on a 1 MW, 2 GeV proton linac will include both normal conducting and superconducting accelerator structures. The project is currently in the technical design phase. The normal conducting part of the TAC PAF will consist of an ion source, a low energy beam transport line, a radio frequency quadrupole, a medium energy beam transport line, and two drift tube linac structures in order to accelerate the beam up to 65 MeV. Acceleration from 65 MeV up to 150 MeV and then 2 GeV energy will be provided by a SC-spoke cavity and two SC-elliptical cavities, respectively. In the long term, TAC PAF will be used as a neutron source. The accelerator structures, their design, and possible experimental stations of TAC PAF project will be presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME049
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THPME059	Preparation of the Coupled RFQ-IH-cavity for FRANZ	rfq, coupling, cavity, operation	3367
	M. Heilmann, C. Claessens, O. Meusel, D. Mäder, U. Ratzinger, A. Schempp, M. Schwarz IAP, Frankfurt am Main, Germany
	The Frankfurt neutron source at the Stern-Gerlach-Zentrum (FRANZ) will provide ultra-short neutron pulses at high intensities and repetition rates. The neutrons will be produced using the 7Li(p, n)7Be reaction induced by a proton beam. The 175 MHz IH-type drift tube linac with 8 gaps succeeds a 4-rod-RFQ. Together they form a coupled linac combination with a length of 2.3 m and accelerate the protons from 120 keV to 2.03 MeV. As the RF losses add up to 200 kW, the cooling of both accelerators is a central challenge. The RFQ-IH combination is powered by a radio frequency amplifier, which couples the RF power into the RFQ. The two structures are connected via inductive coupling. The initial beam operation of the accelerators is configured for 50 mA in cw mode. The IH-components were fabricated, RF tuning measurements are underway. The RFQ and the IH-DTL will be conditioned separately and then be connected, aiming for a beam operation at the end of 2014. A main challenge in fabrication was the precise welding required for the water cooled drift tubes and stems.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME059
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THPME179	Beam Diagnostics Measurements at 3MeV of the LINAC4 H⁻ Beam at CERN	linac, emittance, electron, quadrupole	3694
	F. Zocca, J.C. Allica Santamaria, M. Duraffourg, G.J. Focker, D. Gerard, B. Kolad, L. Lenardon, M. Ludwig, U. Raich, F. Roncarolo, M. Sordet, J. Tan, J. Tassan-Viol, C. Vuitton CERN, Geneva, Switzerland A. Feschenko MIPT, Dolgoprudniy, Moscow Region, Russia A. Feschenko RAS/INR, Moscow, Russia
	As part of the CERN LHC injector chain upgrade, LINAC4 will accelerate H⁻ ions to 160 MeV, replacing the old 50 MeV proton linac. The ion source, the Low Energy Beam Transfer (LEBT) line, the 3 MeV Radio Frequency Quadrupole and the Medium Energy Beam Transfer (MEBT) line hosting a chopper, have been first commissioned in a dedicated test stand and are now tested in the LINAC4 tunnel. Diagnostics devices are installed in the LEBT and MEBT line and in a movable diagnostics test bench which is temporarily added to the MEBT exit. The paper gives an overview of all the instruments used, including beam current transformers, beam position monitors, wire scanners and wire grids for transverse profile measurements, a longitudinal bunch shape monitor and a slit-and-grid emittance meter. The movable test bench also includes a spectrometer that allows measuring the beam energy spread in conjunction with a wire grid. The present understanding of the instrumentation performance is discussed and the measurement results that allowed characterizing the 3 MeV beam in the LINAC4 tunnel are summarized.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME179
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THPRI056	A New Debunching Cavity for the ISIS H⁻ Injector	cavity, vacuum, simulation, radio-frequency	3899
	B.S. Drumm, A.P. Letchford, R.E. Williamson STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom M. Keelan STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
	The energy range of the ISIS 70MeV H⁻ injected beam is reduced using an RF debunching cavity. The existing cavity consists of a mild steel vacuum vessel containing a water-cooled copper shell into which RF power is fed. The unit is made up of components designed for the 50 MeV Proton Linear Accelerator (PLA) which used to occupy the Rutherford Appleton Laboratory (RAL) site between 1957 and 1969. The component drawings date back to the late 1960s. Due to its age, complexity and a lack of spares, there is a need for a modern solution. This paper documents the development of a new debunching cavity for the ISIS neutron source.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI056
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Paper

Title

Other Keywords

Page

TUPRO061

Benchmarking Beam Envelope Models for the European Spallation Source

simulation, dipole, linac, space-charge

1174

I. List
Cosylab, Ljubljana, Slovenia
E. Laface
ESS, Lund, Sweden

TraceWin is used at the European Spallation Source (ESS) as the design tool, while fast and accurate on-line models will be needed during the operations. Three models are compared: the ESS Linac Simulator (ELS), TraceWin and the OpenXAL. In all of the benchmarked models, dynamics of each beam-line element is, to the first order, represented by a transfer matrix. Differences in the matrices occur, since different reference frames are used and as well different assumptions about the energy of the particles are made. General transformations of the reference frames will be presented. Using those, the comparison of transfer maps among TraceWin and OpenXAL are given. When the differences between TraceWin and OpenXAL were unclear, the benchmark versus other code, like MAD-X and Dynac was done. The best implementations were combined into a new on-line model implementation Java ELS (or JELS) and at last the comparison of the latter with TraceWin is given.

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WEPRO067

Development of NICA Injection Complex

ion, rfq, linac, ion-source

2103

A.V. Butenko, E.E. Donets, A.D. Kovalenko, K.A. Levterov, A.O. Sidorin, G.V. Trubnikov
JINR/VBLHEP, Moscow, Russia
A. Belov
RAS/INR, Moscow, Russia
E.D. Donets, V.V. Fimushkin, A. Govorov, V. Kobets, V. Monchinsky
JINR, Dubna, Moscow Region, Russia
H. Höltermann, H. Podlech, U. Ratzinger, A. Schempp
BEVATECH, Frankfurt, Germany
T. Kulevoy, D.A. Liakin
ITEP, Moscow, Russia
S.M. Polozov
MEPhI, Moscow, Russia

The new accelerator complex Nuclotron-based Ion Collider fAcility (NICA) is assumed to operate using two linear accelerators: the Alvarez-type linac LU-20 as injector for light ions, polarized protons and deuterons and a new linac HILac for heavy ions. The new Booster and existing Nuclotron superconducting rings are the main parts of the injection complex of the NICA collider. The status of ion sources, both linacs and rings is presented.

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WEPRO075

The Conceptual Design of the China White Neutron Source

linac, neutron, rfq, resonance

2127

J.H. Li, X.C. Ruan, X. Wang
CIAE, Beijing, People's Republic of China
J.H. Billen, K.R. Crandall
TechSource, Los Alamos, New Mexico, USA
J. Stovall
ESS, Lund, Sweden
J.Y. Tang
IHEP, Beijing, People's Republic of China
L.M. Young
AES, Medford, New York, USA

Funding: Work supported by NSFC of (91126003)
In order to feed the nuclear data needs for design of the Chinese Accelerator Driven sub-critical System (CADS) and new generation nuclear energy systems, we plan to construct the China White Neutron Source (CWNS). The CWNS will be composed of a Proton Linac, an Accumulator Ring, a Target and Experimental Facilities. The linac is designed to deliver a proton beam having an average current of 1 mA at energy up to 300 MeV. The revolution frequency of the accumulator ring will be ~1.4 MHz. Two spallation targets are planned, with one for short pulsed modes and the other for micro-pulsed mode.

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WEPRO086

Experimental Activity in the ENEA-Frascati Irradiation Facility with 3-7 MeV Protons

proton, experiment, detector, linac

2156

M. Vadrucci, A. Ampollini, F. Bonfigli, M.C. Carpanese, F. Marracino, R.M. Montereali, P. Nenzi, L. Picardi, M. Piccinini, C. Ronsivalle, V. Surrenti, M.A. Vincenti
ENEA C.R. Frascati, Frascati (Roma), Italy
F. Ambrosini
URLS, Rome, Italy
M. Balduzzi, C. Marino, C. Snels
ENEA Casaccia, Roma, Italy
M. Balucani, A. Klyshko
University of Rome "La Sapienza", Rome, Italy
C. De Angelis, G. Esposito, M.A. Tabocchini
ISS, Rome, Italy

A variable energy (3-7 MeV) and pulsed current (0.1 – 100 μA) proton beam has been made available for different applications (radiobiology experiments, detectors development, material studies) in an irradiation facility at ENEA-Frascati based on the 7 MeV injector of the protontherapy linac under realization in the framework of the TOP-IMPLART Project. It is a 425 MHz linear accelerator consisting in a 3 MeV RFQ followed by a DTL up to 7 MeV (PL-7 ACCSYS-HITACHI model) followed by an horizontal and a vertical beam transport line. The latter one is particularly suitable for radiobiology in vitro studies allowing to irradiate besides cell monolayes also cell growing in suspension culture. The paper describes the facility and the recent results of the experimental activity.

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THPME001

Commissioning and Operation of the MedAustron Injector: Results and Future Outlook

ion, rfq, ion-source, emittance

3202

L.C. Penescu, M. Kronberger, T. Kulenkampff, F. Osmić, P. Urschütz
EBG MedAustron, Wr. Neustadt, Austria
W. Pirkl
CERN, Geneva, Switzerland

The MedAustron facility is a synchrotron-driven hadron therapy and research center presently under construction in Wiener Neustadt, Austria. In its final outline, the facility will provide H⁺ beams with kinetic energies ≤250MeV and C6+ beams of ≤400MeV/u for clinical applications, and for non-clinical applications H⁺ of up to 800MeV. First patient treatment is foreseen for the end of 2015. The (H3)+ and C4+ beams are generated at 8keV/u in continuous mode by three ECR ion sources and transported to the RFQ for acceleration to 400keV/u. An inter-tank section matches the beam to the entrance of an IH-mode DTL that accelerates the particles to 7MeV/u before they are stripped to, respectively, H⁺ and C6+, debunched and transported to the injection plane of the synchrotron. At a later stage of the project, beams of other species can be generated with similar optics. This contribution presents the results of the injector commissioning and operation. A comparison with the baseline optics and with the design error studies is given. In addition, an overview on the operational experience is given, with emphasis on the system reliability, stability and reproducibility.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME001

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THPME010

A 325 MHz High Gradient CH – Test Cavity for β=0.16

cavity, linac, operation, focusing

3229

A. Almomani, U. Ratzinger
IAP, Frankfurt am Main, Germany

Funding: BMBF, contract no. 05P12RFRB9
This pulsed linac activity aims on compact designs, which means a considerable increase in voltage gain per meter. At IAP – Frankfurt, a CH – cavity was developed for these studies, where mean effective accelerating fields well above 10 MV/m are expected at 325 MHz, β=0.164. This cavity is developed within a funded project. Currently, the cavity is under construction and expected to be ready for copper plating in autumn 2014. The results might influence the rebuilt of the UNILAC – Alvarez section, which aims on achieving the beam intensities specified for the GSI – FAIR project. The new GSI 3 MW Thales klystron test stand will be very important for these investigations. Detailed investigations for two different types of copper plating can be performed on this cavity. In this work, the status of the cavity fabrication will be presented. Moreover, low temperature operation of copper cavities is discussed for the case of very short RF pulses.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME010

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THPME016

Experimental Results on SCDTL Structures for Protons

proton, beam-transport, coupling, rfq

3247

L. Picardi, A. Ampollini, G. Bazzano, P. Nenzi, C. Ronsivalle, V. Surrenti, M. Vadrucci
ENEA C.R. Frascati, Frascati (Roma), Italy
F. Ambrosini
URLS, Rome, Italy

The medium-energy section of the proton linear accelerator for radiotherapy under realization in the framework of the TOP-IMPLART Project consists in a high frequency 7-35 MeV SCDTL (Side Coupled Drift Tube Linac) structure. The structure, made of 4 modules supplied by one klystron, has been completely designed. The first module up to 11.6 MeV has been built and is under commissioning at ENEA-Frascati and the second and third modules are under realization. The paper describes the system and presents the main results of the experimental activity on this part of the accelerator.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME016

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THPME041

ESS DTL Status: Redesign and Optimizations

emittance, linac, quadrupole, focusing

3314

R. De Prisco, M. Eshraqi
ESS, Lund, Sweden
M. Comunian, F. Grespan, A. Pisent
INFN/LNL, Legnaro (PD), Italy
A.R. Karlsson
Lund University, Lund, Sweden

The European Spallation Source (ESS) uses a linear accelerator to deliver the high intensity proton beam to the target station. The average beam power is 5 MW with a peak beam power at target of 125 MW. In 2013 the ESS linac was costed and to meet the budget some modifications were introduced: the final energy was decreased from 2.5 GeV to 2.0 GeV and the beam current was increased from 50 mA to 62.5 mA to keep the same beam power. As a consequence the ESS Drift Tube Linac, DTL, has been re-designed to match the new requirements. This paper presents the main Radio Frequency (RF) and beam dynamics choices for the ESS DTL.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME041

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THPME044

Statistical Error Studies in the ESS Linac

rfq, linac, emittance, alignment

3323

M. Eshraqi, R. De Prisco, R. Miyamoto, E. Sargsyan
ESS, Lund, Sweden
H.D. Thomsen
ISA, Aarhus, Denmark

Following the completion of the latest layout of the ESS linac statistical error studies have been performed to define the field vector quality and alignment tolerances. Based on these tolerances and error study results a scheme for the correction system is proposed that assures low losses and permits hands-on maintenance. This paper reports on the strategy of simulating and performing the error studies as well as setting the tolerances.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME044

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THPME045

Beam Physics Design of the ESS Medium Energy Beam Transport

linac, rfq, lattice, emittance

3326

R. Miyamoto, B. Cheymol, M. Eshraqi
ESS, Lund, Sweden
I. Bustinduy
ESS Bilbao, Bilbao, Spain

A radio frequency quadrupole (RFQ) and drift tube linac (DTL) in the ESS proton linac are connected with a medium energy beam transport (MEBT) to remove low intensity bunches on the head and tail of a macro-pulse with a chopper and house diagnostic devices to characterize and adjust the beam out of the RFQ for the DTL. These must be achieved within a relatively short space and without large degradation of beam quality due to space charge force, imposing a challenge on the lattice design. This paper presents a beam physics design of the MEBT in the ESS proton linac, which satisfies its requirement while preserving a decent beam quality.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME045

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THPME049

TAC Proton Accelerator Facility: Normal Conducting Part

proton, ion-source, ion, linac

3335

E. Algin
Eskisehir Osmangazi University, Eskisehir, Turkey
B. Akkus, L. Sahin
Istanbul University, Istanbul, Turkey
H. Cetinkaya
Dumlupinar University, Faculty of Science and Arts, Kutahya, Turkey

The Turkish Accelerator Center Proton Accelerator Facility (TAC PAF) based on a 1 MW, 2 GeV proton linac will include both normal conducting and superconducting accelerator structures. The project is currently in the technical design phase. The normal conducting part of the TAC PAF will consist of an ion source, a low energy beam transport line, a radio frequency quadrupole, a medium energy beam transport line, and two drift tube linac structures in order to accelerate the beam up to 65 MeV. Acceleration from 65 MeV up to 150 MeV and then 2 GeV energy will be provided by a SC-spoke cavity and two SC-elliptical cavities, respectively. In the long term, TAC PAF will be used as a neutron source. The accelerator structures, their design, and possible experimental stations of TAC PAF project will be presented.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME049

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THPME059

Preparation of the Coupled RFQ-IH-cavity for FRANZ

rfq, coupling, cavity, operation

3367

M. Heilmann, C. Claessens, O. Meusel, D. Mäder, U. Ratzinger, A. Schempp, M. Schwarz
IAP, Frankfurt am Main, Germany

The Frankfurt neutron source at the Stern-Gerlach-Zentrum (FRANZ) will provide ultra-short neutron pulses at high intensities and repetition rates. The neutrons will be produced using the 7Li(p, n)7Be reaction induced by a proton beam. The 175 MHz IH-type drift tube linac with 8 gaps succeeds a 4-rod-RFQ. Together they form a coupled linac combination with a length of 2.3 m and accelerate the protons from 120 keV to 2.03 MeV. As the RF losses add up to 200 kW, the cooling of both accelerators is a central challenge. The RFQ-IH combination is powered by a radio frequency amplifier, which couples the RF power into the RFQ. The two structures are connected via inductive coupling. The initial beam operation of the accelerators is configured for 50 mA in cw mode. The IH-components were fabricated, RF tuning measurements are underway. The RFQ and the IH-DTL will be conditioned separately and then be connected, aiming for a beam operation at the end of 2014. A main challenge in fabrication was the precise welding required for the water cooled drift tubes and stems.

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reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPME059

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THPME179

Beam Diagnostics Measurements at 3MeV of the LINAC4 H⁻ Beam at CERN

linac, emittance, electron, quadrupole

3694

F. Zocca, J.C. Allica Santamaria, M. Duraffourg, G.J. Focker, D. Gerard, B. Kolad, L. Lenardon, M. Ludwig, U. Raich, F. Roncarolo, M. Sordet, J. Tan, J. Tassan-Viol, C. Vuitton
CERN, Geneva, Switzerland
A. Feschenko
MIPT, Dolgoprudniy, Moscow Region, Russia
A. Feschenko
RAS/INR, Moscow, Russia

As part of the CERN LHC injector chain upgrade, LINAC4 will accelerate H⁻ ions to 160 MeV, replacing the old 50 MeV proton linac. The ion source, the Low Energy Beam Transfer (LEBT) line, the 3 MeV Radio Frequency Quadrupole and the Medium Energy Beam Transfer (MEBT) line hosting a chopper, have been first commissioned in a dedicated test stand and are now tested in the LINAC4 tunnel. Diagnostics devices are installed in the LEBT and MEBT line and in a movable diagnostics test bench which is temporarily added to the MEBT exit. The paper gives an overview of all the instruments used, including beam current transformers, beam position monitors, wire scanners and wire grids for transverse profile measurements, a longitudinal bunch shape monitor and a slit-and-grid emittance meter. The movable test bench also includes a spectrometer that allows measuring the beam energy spread in conjunction with a wire grid. The present understanding of the instrumentation performance is discussed and the measurement results that allowed characterizing the 3 MeV beam in the LINAC4 tunnel are summarized.

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THPRI056

A New Debunching Cavity for the ISIS H⁻ Injector

cavity, vacuum, simulation, radio-frequency

3899

B.S. Drumm, A.P. Letchford, R.E. Williamson
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
M. Keelan
STFC/RAL, Chilton, Didcot, Oxon, United Kingdom

The energy range of the ISIS 70MeV H⁻ injected beam is reduced using an RF debunching cavity. The existing cavity consists of a mild steel vacuum vessel containing a water-cooled copper shell into which RF power is fed. The unit is made up of components designed for the 50 MeV Proton Linear Accelerator (PLA) which used to occupy the Rutherford Appleton Laboratory (RAL) site between 1957 and 1969. The component drawings date back to the late 1960s. Due to its age, complexity and a lack of spares, there is a need for a modern solution. This paper documents the development of a new debunching cavity for the ISIS neutron source.

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