2011 Particle Accelerator Conference - Classification: Sources and Medium Energy Accelerators / Accel/Storage Rings 08: Linear Accelerators

Paper

Title

Page

The FNAL Injector Upgrade

1701

C.-Y. Tan, D.S. Bollinger, K.L. Duel, J.R. Lackey, W. Pellico
Fermilab, Batavia, USA

The present FNAL linac H⁻ injector has been operational since the 1970s and consists of two magnetron H⁻ sources and a 750keV Cockcroft-Walton Accelerator. In the upgrade, both slit-type magnetron sources will be replaced with circular aperture sources, and the Cockcroft-Walton with a 200MHz RFQ. Operational experience at BNL (Brookhaven National Laboratory) has shown that the upgraded source and RFQ will be more reliable and require less manpower than the present system.

WEP209

Reliability Study of the AIRIX Induction Accelerator over a Functioning Period of Ten Years (2000-2010)

1882

H. Dzitko, A. Georges, B. Gouin, M. Mouillet
CEA, Pontfaverger-Moronvilliers, France

AIRIX is a high current (19 MeV, 2 kA) electron linear induction accelerator used as a 60 ns single shot X-ray source for hydrodynamic experiments. As single shot experiments are performed with the AIRIX facility, the best performances and a high reliability level must be met for each experiment. A high availability is also a key issue for the successful development of hydrotest projects. The AIRIX accelerator has been running for hydroshot experiments since 2000 and several thousands electron and X-ray beams have been produced. This paper outlines the reliability results of the AIRIX accelerator over a functioning period of ten years. Failure rates for each main subsystems are shown : injector, accelerating cells, high voltage generators, and measurement chains. We also give an overview of the most probable faults, with the associated occurrence rates, which can alter the X source of the AIRIX machine over this ten year period.

WEP210

Low Energy Beam Measurements Using PHIL Accelerator at LAL, Comparison with PARMELA Simulations

1885

J. Brossard, F. Blot, C. Bruni, S. Cavalier, J-N. Cayla, A. Gonnin, M. Joré, P. Lepercq, S.B. Letourneur, B.M. Mercier, H. Monard, C. Prevost, R. Roux, A. Variola
LAL, Orsay, France

PHIL (“PHoto-Injector at LAL") is a new electron beam accelerator at LAL. This accelerator is dedicated to test and characterize electron RF-guns and to deliver electron beam to users. This machine has been designed to produce and characterise low energy (E<10 MeV), small emittance (e<10 p.mm.mrad), high brilliance electrons bunch at low repetition frequency (n<10Hz). The first beam has been obtained on the 4th of November 2009. The current RF-gun tested on PHIL is the AlphaX gun, a 2.5 cell S-band cavity designed by LAL for the plasma accelerator studies performed at the Strathclyde university. This paper will present the first AlphaX RF-gun characterizations performed at LAL on PHIL accelerator, and will show comparisons between measurements and PARMELA simulations.

WEP212

Development of a 325 MHz 4-Rod RFQ

1888

B. Koubek, U. Bartz, A. Schempp, J.S. Schmidt
IAP, Frankfurt am Main, Germany

A 4-Rod RFQ with a frequency of 325 MHz and an output energy of 3 MeV will be build as a part of the FAIR project of GSI. Design studies and model measurements on a short prototype of a 325 MHz 4-Rod RFQ model were made including simulations using CST Microwave Studio. The latest simulation results regarding the dipole field of this structure are presented in this paper.

WEP213

New Development of a RFQ Beam Matching Section

1891

M. Baschke, N. Müller, A. Schempp, J.S. Schmidt
IAP, Frankfurt am Main, Germany

Funding: BMBF
Funneling is a method to increase low energy beam currents in multiple stages. The Frankfurt Funneling Experiment is a model of such a stage. The experiment is built up of two ion sources with electrostatic lens systems, a Two-Beam-RFQ accelerator, a funneling deflector and a beam diagnostic system. The two beams are bunched and accelerated in a Two-Beam RFQ. A funneling deflector combines the bunches to a common beam axis. Current work is the construction and beam tests of a new beam transport system between RFQ accelerator and deflector. With extended RFQ-electrodes the drift between the Two-Beam-RFQ and the rf-deflector will be minimized and therefore unwanted emittance growth reduced. First rf-measurements with the improved Two-Beam-RFQ will be presented.

WEP214

Tuning Studies on 4-Rod RFQs

1894

J.S. Schmidt, B. Koubek, A. Schempp
IAP, Frankfurt am Main, Germany

For the optimization of Radio Frequency Quadrupole (RFQ) design parameters, a certain voltage distribution along the electrodes of an RFQ is assumed. Therefore an accurate tuning of the voltage distribution is very important for the beam dynamic properties of an RFQ. A variation can lead to particle losses and reduced beam quality. Our electrode design usually implies a constant longitudinal voltage distribution. For its adjustment tuning plates are used between the stems of the 4-Rod RFQ. Their optimal positions can be found by an iterative process. To structure this tuning process simulations with a NI LabVIEW based Tuning Software and CST Microwave ® are performed and compared to measurements of the ReA3-RFQ of the National Superconducting Cyclotron Laboratory (NSCL) at Michigan State University. The results of this studies are presented in this paper.

WEP220

Development of the Dual-Slot Resonance Linac

1897

D.J. Newsham, N. Barov, R.H. Miller
Far-Tech, Inc., San Diego, California, USA

Funding: Work supported by DOE Office of High Energy Physics, DOE-SBIR #DE-FG02-08ER85034.
We present the development of a novel electron accelerating structure with strong cell-to-cell coupling. The coupling is provided by a pair of resonant slots, separated by a non-resonant void region, located within the wall between adjacent cells. The 10+2/2 cell standing-wave structure, operating in a phase and amplitude stabilized pi/2 mode, will provide an energy gain of 10 MeV.

WEP221

CW Room-Temperature Bunching Cavity for the Project X MEBT

1900

G.V. Romanov, S. Barbanotti, E. Borissov, J.A. Coghill, I.G. Gonin, S. Kazakov, N. Solyak, V.P. Yakovlev
Fermilab, Batavia, USA

The Project-X, a multi-MW proton source based on superconducting linac, is under development at Fermilab. The front end of the linac contains a CW room temperature MEBT section which comprises ion source, RFQ and high-bandwidth bunch selective chopper. The length of the chopper exceeds 10 m, so four re-bunching cavities are used to support the beam longitudinal dynamics. The RF and mechanical designs of the re-bunching cavity including stress and thermal analysis are reported.

WEP222

Low Energy Beam Diagnostic for APEX, the LBNL VHF Photo-injector

1903

D. Filippetto, J.M. Byrd, M.J. Chin, C.W. Cork, S. De Santis, L.R. Doolittle, J. Feng, W.E. Norum, C. F. Papadopoulos, G.J. Portmann, D.G. Quintas, F. Sannibale, M.E. Stuart, R.P. Wells, M.S. Zolotorev
LBNL, Berkeley, California, USA

Funding: This work was supported by the Director of the Office of Science of the US Department of Energy under Contract no. DEAC02-05CH11231
A high-repetition rate (MHz-class), high-brightness electron beam photo-gun is under construction at Lawrence Berkeley National Laboratory in the framework of the Advanced Photo-injector EXperiment (APEX). The injector gun is based on a normal conducting 187 MHz RF cavity operating in CW mode. In its first operational phase it will deliver short bunches (~ 1 to tens of picoseconds) with energy of 750keV, and bunch charges ranging from 1pC to 1nC. Different high efficiency cathode materials will be tested, and the beam quality will be studied as a function of parameters as charge, initial bunch length and transverse size, focusing strength. Both the laser and electron beam diagnostics have been designed to assure the needed flexibility. In particular a high-resolution electron diagnostic section after the photo-gun provides the necessary dynamical range for scanned beam parameters: energy and energy spread, charge and current, transverse and longitudinal phase spaces, slice properties. The photo-gun electron beam diagnostic layout is presented, and the hardware choices, resolution and achievable dynamical ranges are also discussed.

WEP224

Operational Status and Life Extension Plans for the Los Alamos Neutron Science Center (LANSCE)

1906

J.L. Erickson, D. Rees
LANL, Los Alamos, New Mexico, USA

Funding: Work supported by the U. S. Department of Energy, National Nuclear Security Administration, Contract No. DE-AC52-06NA25396 – Publication Release LA-UR- 10-06556
The Los Alamos Neutron Science Center (LANSCE) accelerator and beam delivery complex generates the proton beams that serve three neutron production sources, a proton radiography facility and a medical and research isotope production facility. The recent operating history of the facility, including both achievements and challenges, will be reviewed. Plans for performance improvement will be discussed, together with the underlying drivers for the ongoing LANSCE Linac Risk Mitigation project. The details of this latter project will be discussed. The status of accelerator-related plans for the MaRIE Project (Matter-Radiation Interactions in Extremes Experimental Project) will also be discussed. Taken together, the LANSCE Linac Risk Mitigation Project and the MaRIE initiative demonstrate a commitment to investment in the ongoing operation and improvement of the facility, and a resurgent interest in the spectrum of science accessible at LANSCE. These plans will assure continued facility operational and scientific vitality well beyond 2020.

WEP225

H-Mode Accelerating Structures with PMQ Focusing for Low-Beta Beams

1909

S.S. Kurennoy, J.F. O'Hara, E.R. Olivas, L. Rybarcyk
LANL, Los Alamos, New Mexico, USA

We report results of the project developing high-efficiency normal-conducting RF accelerating structures based on inter-digital H-mode (IH) cavities and the transverse beam focusing with permanent-magnet quadrupoles (PMQ), for beam velocities in the range of a few percent of the speed of light. The shunt impedance of IH-PMQ structures is 10^-20 times higher than that of a conventional drift-tube linac, while the transverse size is 4-5 times smaller. The H-PMQ accelerating structures following a short RFQ can be used both in the front end of ion linacs or in stand-alone applications. Results of the combined 3-D modeling – electromagnetic computations, beam-dynamics simulations with high currents, and thermal-stress analysis – for a full IH-PMQ accelerator tank are presented. The accelerating field profile in the tank is tuned to provide the best propagation of a 50-mA deuteron beam using coupled iterations of electromagnetic and beam-dynamics modeling. Multi-particle simulations with Parmela and CST Particle Studio have been used to confirm the design. Measurement results of a cold model of the IH-PMQ tank are in a good agreement with the calculations and will also be presented.

WEP226

Commissioning Results of the ReA RFQ at MSU*

1912

D. Leitner, C. Benatti, S.W. Krause, D. Morris, S. Nash, J. Ottarson, G. Perdikakis, M. Portillo, R. Rencsok, T. Ropponen, L. Tobos, N.R. Usher, D. Wang
NSCL, East Lansing, Michigan, USA
J. Haeuser
Kress GmbH, Biebergemuend, Germany
O.K. Kester
GSI, Darmstadt, Germany
F. Marti, E. Tanke, X. Wu, Q. Zhao
FRIB, East Lansing, Michigan, USA
A. Schempp, J.S. Schmidt, H. Zimmermann
IAP, Frankfurt am Main, Germany

Funding: Project funded by Michigan State University
The Facility for Rare Isotope Beams (FRIB) is currently in the preliminary design phase at Michigan State University (MSU). FRIB consists of a driver LINAC for the acceleration of heavy ion beams, followed by a fragmentation target station and a ReAccelerator facility (ReA3). ReA3 comprises gas stopper systems, an Electron Beam Ion Trap (EBIT) charge state booster, a room temperature radio frequency quadrupole (RFQ), a LINAC using superconducting quarter wave resonators and an achromatic beam transport and distribution line to the new experimental area. Beams from ReA3 will range from 3 MeV/u for heavy ions to about 6 MeV/u for light ions. The ReA3 RFQ, which is of the 4 rod type, is designed to accelerate ions with an Q/A of 0.2 to 0.5 from 12 keV/u to 600 keV/u. The RFQ operates at a frequency of 80.5 MHz and power levels up to 120 kW at 10% duty factor. In this paper we will report on commissioning results from the ReA3 RFQ using a H²⁺ and He⁺ beam from an auxiliary ion source.

THOCN3

Electron Linac Photo-fission Driver for the Rare Isotope Program at TRIUMF

S.R. Koscielniak, F. Ames, R.A. Baartman, C.D. Beard, P.G. Bricault, I.V. Bylinskii, Y.-C. Chao, R.J. Dawson, K. Fong, A. Koveshnikov, R.E. Laxdal, F. Mammarella, M. Marchetto, L. Merminga, A.K. Mitra, I. Sekachev, V.A. Verzilov, V. Zvyagintsev
TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
A. Chakrabarti, S. Dechoudhury, M. Mondal, V. Naik
DAE/VECC, Calcutta, India
D. Karlen
Victoria University, Victoria, B.C., Canada

In July 2010 the Advanced Rare Isotope Laboratory became a funded project. In collaboration with its Canadian member universities TRIUMF was awarded federal and provincial government funds for the construction of a new target building, a connecting tunnel, and an electron linear accelerator in support of its expanding rare isotope program that serves nuclear structure and astrophysics studies as well as materials and medical science. TRIUMF has embarked on the design of a 300 keV thermionic gun, a 10 MeV Injector cryomodule (ICM) and two 20 MeV Accelerator cryomodules, and beam transfer lines. Both the ICM and RF-modulated e-gun are being fast tracked; the former in collaboration with the VECC in Kolkata, India. The c.w. linac is based on super-conducting radiofrequency technology at 1.3 GHz. This paper gives an overview of the facility and accelerator design progress including beam dynamics and diagnostics, cryomodules and cryogenics, high power RF, and machine layout including beam lines.

Slides THOCN3 [2.681 MB]

THOCN4

High-Power Options for LANSCE

2107

R.W. Garnett, E.J. Pitcher, D. Rees, L. Rybarcyk, T. Tajima
LANL, Los Alamos, New Mexico, USA

Funding: This work is supported by the U. S. Department of Energy Contract DE-AC52-06NA25396.
The LANSCE linear accelerator at Los Alamos National Laboratory has a long history of successful beam operations at 800 kW. We have recently studied options for restoration of high-power operations including schemes for increasing the performance to multi-MW levels. In this paper we will discuss the results of this study including the present limitations of the existing accelerating structures at LANSCE, and the high-voltage and RF systems that drive them. Several plausible options will be discussed and a preferred option will be presented that will enable the first in a new generation of scientific facilities for the materials community. The emphasis of this new facility is "Matter-Radiation Interactions in Extremes" (MaRIE) which will be used to discover and design the advanced materials needed to meet 21st century national security and energy security challenges.

Slides THOCN4 [2.903 MB]

THOCN5

ATLAS Upgrade

2110

P.N. Ostroumov, A. Barcikowski, Z.A. Conway, S.M. Gerbick, M. Kedzie, M.P. Kelly, S.W.T. MacDonald, B. Mustapha, R.C. Pardo, S.I. Sharamentov
ANL, Argonne, USA

Funding: This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357.
ATLAS (Argonne Tandem Linac Accelerator System) upgrade requires several substantial developments in accelerator technologies, such as CW heavy ion RFQ and high-performance cryomodule with low-beta cavities. The upgrade project is well advanced. The physics and engineering design of the RFQ are complete and fabrication of OFE copper parts is in progress. The 3.9-meter length RFQ is composed from 5 strongly coupled segments. High-temperature furnace brazing of the segments is planned for the summer of 2011. The RFQ design includes several innovative features such as trapezoidal vane tip modulation, compact output radial matcher to form an axially symmetric beam. The upgrade project also includes development and construction of a cryomodule containing seven 72.75 MHz SC quarter wave cavities designed for the geometrical β= 0.077 and four SC solenoids. The cavity is designed to obtain an accelerating voltage higher than 2.5 MV. The prototype cavity together with high-power capacitive coupler and piezoelectric tuner has been developed, fabricated and is being tested. This paper reports innovative design features of both RFQ and SRF linac and current status of the project.

Slides THOCN5 [3.070 MB]

FROBN3

Project X - New Multi Megawatt Proton Source at Fermilab

2566

S. Nagaitsev
Fermilab, Batavia, USA

Fermilab plans to replace its present injection complex consisting of a pulsed linac and 15 Hz Booster with a new injection complex based on a superconducting CW linac. This new proton source should boost the power of the Main Injector to 2 MW and enable new experiments with a high power proton beam in the range of 1-3 GeV. The speaker will present recent developments from the Fermilab Project X R&D.

Slides FROBN3 [2.018 MB]

FROBN4

Commissioning of the 20MV Superconducting Linac Upgrade at TRIUMF

2570

M. Marchetto
TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada

The Phase II upgrade of the ISAC-II Superconducting Heavy Ion Linac involves the addition of twenty quarter-wave bulk niobium resonators housed in three cryomodules. This addition brings the total installed accelerating voltage from 20MV to 40MV. The cavities are produced in Canadian industry with cavity testing and cryomodule assembly at TRIUMF. The speaker will discuss commissioning of, and operations with, this major upgrade, which commenced in April 2010.

Slides FROBN4 [3.990 MB]

Paper	Title	Page
WEP115	The FNAL Injector Upgrade	1701
	C.-Y. Tan, D.S. Bollinger, K.L. Duel, J.R. Lackey, W. Pellico Fermilab, Batavia, USA
	The present FNAL linac H⁻ injector has been operational since the 1970s and consists of two magnetron H⁻ sources and a 750keV Cockcroft-Walton Accelerator. In the upgrade, both slit-type magnetron sources will be replaced with circular aperture sources, and the Cockcroft-Walton with a 200MHz RFQ. Operational experience at BNL (Brookhaven National Laboratory) has shown that the upgraded source and RFQ will be more reliable and require less manpower than the present system.

WEP209	Reliability Study of the AIRIX Induction Accelerator over a Functioning Period of Ten Years (2000-2010)	1882
	H. Dzitko, A. Georges, B. Gouin, M. Mouillet CEA, Pontfaverger-Moronvilliers, France
	AIRIX is a high current (19 MeV, 2 kA) electron linear induction accelerator used as a 60 ns single shot X-ray source for hydrodynamic experiments. As single shot experiments are performed with the AIRIX facility, the best performances and a high reliability level must be met for each experiment. A high availability is also a key issue for the successful development of hydrotest projects. The AIRIX accelerator has been running for hydroshot experiments since 2000 and several thousands electron and X-ray beams have been produced. This paper outlines the reliability results of the AIRIX accelerator over a functioning period of ten years. Failure rates for each main subsystems are shown : injector, accelerating cells, high voltage generators, and measurement chains. We also give an overview of the most probable faults, with the associated occurrence rates, which can alter the X source of the AIRIX machine over this ten year period.

WEP210	Low Energy Beam Measurements Using PHIL Accelerator at LAL, Comparison with PARMELA Simulations	1885
	J. Brossard, F. Blot, C. Bruni, S. Cavalier, J-N. Cayla, A. Gonnin, M. Joré, P. Lepercq, S.B. Letourneur, B.M. Mercier, H. Monard, C. Prevost, R. Roux, A. Variola LAL, Orsay, France
	PHIL (“PHoto-Injector at LAL") is a new electron beam accelerator at LAL. This accelerator is dedicated to test and characterize electron RF-guns and to deliver electron beam to users. This machine has been designed to produce and characterise low energy (E<10 MeV), small emittance (e<10 p.mm.mrad), high brilliance electrons bunch at low repetition frequency (n<10Hz). The first beam has been obtained on the 4th of November 2009. The current RF-gun tested on PHIL is the AlphaX gun, a 2.5 cell S-band cavity designed by LAL for the plasma accelerator studies performed at the Strathclyde university. This paper will present the first AlphaX RF-gun characterizations performed at LAL on PHIL accelerator, and will show comparisons between measurements and PARMELA simulations.

WEP212	Development of a 325 MHz 4-Rod RFQ	1888
	B. Koubek, U. Bartz, A. Schempp, J.S. Schmidt IAP, Frankfurt am Main, Germany
	A 4-Rod RFQ with a frequency of 325 MHz and an output energy of 3 MeV will be build as a part of the FAIR project of GSI. Design studies and model measurements on a short prototype of a 325 MHz 4-Rod RFQ model were made including simulations using CST Microwave Studio. The latest simulation results regarding the dipole field of this structure are presented in this paper.

WEP213	New Development of a RFQ Beam Matching Section	1891
	M. Baschke, N. Müller, A. Schempp, J.S. Schmidt IAP, Frankfurt am Main, Germany
	Funding: BMBF Funneling is a method to increase low energy beam currents in multiple stages. The Frankfurt Funneling Experiment is a model of such a stage. The experiment is built up of two ion sources with electrostatic lens systems, a Two-Beam-RFQ accelerator, a funneling deflector and a beam diagnostic system. The two beams are bunched and accelerated in a Two-Beam RFQ. A funneling deflector combines the bunches to a common beam axis. Current work is the construction and beam tests of a new beam transport system between RFQ accelerator and deflector. With extended RFQ-electrodes the drift between the Two-Beam-RFQ and the rf-deflector will be minimized and therefore unwanted emittance growth reduced. First rf-measurements with the improved Two-Beam-RFQ will be presented.

WEP214	Tuning Studies on 4-Rod RFQs	1894
	J.S. Schmidt, B. Koubek, A. Schempp IAP, Frankfurt am Main, Germany
	For the optimization of Radio Frequency Quadrupole (RFQ) design parameters, a certain voltage distribution along the electrodes of an RFQ is assumed. Therefore an accurate tuning of the voltage distribution is very important for the beam dynamic properties of an RFQ. A variation can lead to particle losses and reduced beam quality. Our electrode design usually implies a constant longitudinal voltage distribution. For its adjustment tuning plates are used between the stems of the 4-Rod RFQ. Their optimal positions can be found by an iterative process. To structure this tuning process simulations with a NI LabVIEW based Tuning Software and CST Microwave ® are performed and compared to measurements of the ReA3-RFQ of the National Superconducting Cyclotron Laboratory (NSCL) at Michigan State University. The results of this studies are presented in this paper.

WEP220	Development of the Dual-Slot Resonance Linac	1897
	D.J. Newsham, N. Barov, R.H. Miller Far-Tech, Inc., San Diego, California, USA
	Funding: Work supported by DOE Office of High Energy Physics, DOE-SBIR #DE-FG02-08ER85034. We present the development of a novel electron accelerating structure with strong cell-to-cell coupling. The coupling is provided by a pair of resonant slots, separated by a non-resonant void region, located within the wall between adjacent cells. The 10+2/2 cell standing-wave structure, operating in a phase and amplitude stabilized pi/2 mode, will provide an energy gain of 10 MeV.

WEP221	CW Room-Temperature Bunching Cavity for the Project X MEBT	1900
	G.V. Romanov, S. Barbanotti, E. Borissov, J.A. Coghill, I.G. Gonin, S. Kazakov, N. Solyak, V.P. Yakovlev Fermilab, Batavia, USA
	The Project-X, a multi-MW proton source based on superconducting linac, is under development at Fermilab. The front end of the linac contains a CW room temperature MEBT section which comprises ion source, RFQ and high-bandwidth bunch selective chopper. The length of the chopper exceeds 10 m, so four re-bunching cavities are used to support the beam longitudinal dynamics. The RF and mechanical designs of the re-bunching cavity including stress and thermal analysis are reported.

WEP222	Low Energy Beam Diagnostic for APEX, the LBNL VHF Photo-injector	1903
	D. Filippetto, J.M. Byrd, M.J. Chin, C.W. Cork, S. De Santis, L.R. Doolittle, J. Feng, W.E. Norum, C. F. Papadopoulos, G.J. Portmann, D.G. Quintas, F. Sannibale, M.E. Stuart, R.P. Wells, M.S. Zolotorev LBNL, Berkeley, California, USA
	Funding: This work was supported by the Director of the Office of Science of the US Department of Energy under Contract no. DEAC02-05CH11231 A high-repetition rate (MHz-class), high-brightness electron beam photo-gun is under construction at Lawrence Berkeley National Laboratory in the framework of the Advanced Photo-injector EXperiment (APEX). The injector gun is based on a normal conducting 187 MHz RF cavity operating in CW mode. In its first operational phase it will deliver short bunches (~ 1 to tens of picoseconds) with energy of 750keV, and bunch charges ranging from 1pC to 1nC. Different high efficiency cathode materials will be tested, and the beam quality will be studied as a function of parameters as charge, initial bunch length and transverse size, focusing strength. Both the laser and electron beam diagnostics have been designed to assure the needed flexibility. In particular a high-resolution electron diagnostic section after the photo-gun provides the necessary dynamical range for scanned beam parameters: energy and energy spread, charge and current, transverse and longitudinal phase spaces, slice properties. The photo-gun electron beam diagnostic layout is presented, and the hardware choices, resolution and achievable dynamical ranges are also discussed.

WEP224	Operational Status and Life Extension Plans for the Los Alamos Neutron Science Center (LANSCE)	1906
	J.L. Erickson, D. Rees LANL, Los Alamos, New Mexico, USA
	Funding: Work supported by the U. S. Department of Energy, National Nuclear Security Administration, Contract No. DE-AC52-06NA25396 – Publication Release LA-UR- 10-06556 The Los Alamos Neutron Science Center (LANSCE) accelerator and beam delivery complex generates the proton beams that serve three neutron production sources, a proton radiography facility and a medical and research isotope production facility. The recent operating history of the facility, including both achievements and challenges, will be reviewed. Plans for performance improvement will be discussed, together with the underlying drivers for the ongoing LANSCE Linac Risk Mitigation project. The details of this latter project will be discussed. The status of accelerator-related plans for the MaRIE Project (Matter-Radiation Interactions in Extremes Experimental Project) will also be discussed. Taken together, the LANSCE Linac Risk Mitigation Project and the MaRIE initiative demonstrate a commitment to investment in the ongoing operation and improvement of the facility, and a resurgent interest in the spectrum of science accessible at LANSCE. These plans will assure continued facility operational and scientific vitality well beyond 2020.

WEP225	H-Mode Accelerating Structures with PMQ Focusing for Low-Beta Beams	1909
	S.S. Kurennoy, J.F. O'Hara, E.R. Olivas, L. Rybarcyk LANL, Los Alamos, New Mexico, USA
	We report results of the project developing high-efficiency normal-conducting RF accelerating structures based on inter-digital H-mode (IH) cavities and the transverse beam focusing with permanent-magnet quadrupoles (PMQ), for beam velocities in the range of a few percent of the speed of light. The shunt impedance of IH-PMQ structures is 10^-20 times higher than that of a conventional drift-tube linac, while the transverse size is 4-5 times smaller. The H-PMQ accelerating structures following a short RFQ can be used both in the front end of ion linacs or in stand-alone applications. Results of the combined 3-D modeling – electromagnetic computations, beam-dynamics simulations with high currents, and thermal-stress analysis – for a full IH-PMQ accelerator tank are presented. The accelerating field profile in the tank is tuned to provide the best propagation of a 50-mA deuteron beam using coupled iterations of electromagnetic and beam-dynamics modeling. Multi-particle simulations with Parmela and CST Particle Studio have been used to confirm the design. Measurement results of a cold model of the IH-PMQ tank are in a good agreement with the calculations and will also be presented.

WEP226	Commissioning Results of the ReA RFQ at MSU*	1912
	D. Leitner, C. Benatti, S.W. Krause, D. Morris, S. Nash, J. Ottarson, G. Perdikakis, M. Portillo, R. Rencsok, T. Ropponen, L. Tobos, N.R. Usher, D. Wang NSCL, East Lansing, Michigan, USA J. Haeuser Kress GmbH, Biebergemuend, Germany O.K. Kester GSI, Darmstadt, Germany F. Marti, E. Tanke, X. Wu, Q. Zhao FRIB, East Lansing, Michigan, USA A. Schempp, J.S. Schmidt, H. Zimmermann IAP, Frankfurt am Main, Germany
	Funding: Project funded by Michigan State University The Facility for Rare Isotope Beams (FRIB) is currently in the preliminary design phase at Michigan State University (MSU). FRIB consists of a driver LINAC for the acceleration of heavy ion beams, followed by a fragmentation target station and a ReAccelerator facility (ReA3). ReA3 comprises gas stopper systems, an Electron Beam Ion Trap (EBIT) charge state booster, a room temperature radio frequency quadrupole (RFQ), a LINAC using superconducting quarter wave resonators and an achromatic beam transport and distribution line to the new experimental area. Beams from ReA3 will range from 3 MeV/u for heavy ions to about 6 MeV/u for light ions. The ReA3 RFQ, which is of the 4 rod type, is designed to accelerate ions with an Q/A of 0.2 to 0.5 from 12 keV/u to 600 keV/u. The RFQ operates at a frequency of 80.5 MHz and power levels up to 120 kW at 10% duty factor. In this paper we will report on commissioning results from the ReA3 RFQ using a H²⁺ and He⁺ beam from an auxiliary ion source.

THOCN3	Electron Linac Photo-fission Driver for the Rare Isotope Program at TRIUMF
	S.R. Koscielniak, F. Ames, R.A. Baartman, C.D. Beard, P.G. Bricault, I.V. Bylinskii, Y.-C. Chao, R.J. Dawson, K. Fong, A. Koveshnikov, R.E. Laxdal, F. Mammarella, M. Marchetto, L. Merminga, A.K. Mitra, I. Sekachev, V.A. Verzilov, V. Zvyagintsev TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada A. Chakrabarti, S. Dechoudhury, M. Mondal, V. Naik DAE/VECC, Calcutta, India D. Karlen Victoria University, Victoria, B.C., Canada
	In July 2010 the Advanced Rare Isotope Laboratory became a funded project. In collaboration with its Canadian member universities TRIUMF was awarded federal and provincial government funds for the construction of a new target building, a connecting tunnel, and an electron linear accelerator in support of its expanding rare isotope program that serves nuclear structure and astrophysics studies as well as materials and medical science. TRIUMF has embarked on the design of a 300 keV thermionic gun, a 10 MeV Injector cryomodule (ICM) and two 20 MeV Accelerator cryomodules, and beam transfer lines. Both the ICM and RF-modulated e-gun are being fast tracked; the former in collaboration with the VECC in Kolkata, India. The c.w. linac is based on super-conducting radiofrequency technology at 1.3 GHz. This paper gives an overview of the facility and accelerator design progress including beam dynamics and diagnostics, cryomodules and cryogenics, high power RF, and machine layout including beam lines.
	Slides THOCN3 [2.681 MB]

THOCN4	High-Power Options for LANSCE	2107
	R.W. Garnett, E.J. Pitcher, D. Rees, L. Rybarcyk, T. Tajima LANL, Los Alamos, New Mexico, USA
	Funding: This work is supported by the U. S. Department of Energy Contract DE-AC52-06NA25396. The LANSCE linear accelerator at Los Alamos National Laboratory has a long history of successful beam operations at 800 kW. We have recently studied options for restoration of high-power operations including schemes for increasing the performance to multi-MW levels. In this paper we will discuss the results of this study including the present limitations of the existing accelerating structures at LANSCE, and the high-voltage and RF systems that drive them. Several plausible options will be discussed and a preferred option will be presented that will enable the first in a new generation of scientific facilities for the materials community. The emphasis of this new facility is "Matter-Radiation Interactions in Extremes" (MaRIE) which will be used to discover and design the advanced materials needed to meet 21st century national security and energy security challenges.
	Slides THOCN4 [2.903 MB]

THOCN5	ATLAS Upgrade	2110
	P.N. Ostroumov, A. Barcikowski, Z.A. Conway, S.M. Gerbick, M. Kedzie, M.P. Kelly, S.W.T. MacDonald, B. Mustapha, R.C. Pardo, S.I. Sharamentov ANL, Argonne, USA
	Funding: This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357. ATLAS (Argonne Tandem Linac Accelerator System) upgrade requires several substantial developments in accelerator technologies, such as CW heavy ion RFQ and high-performance cryomodule with low-beta cavities. The upgrade project is well advanced. The physics and engineering design of the RFQ are complete and fabrication of OFE copper parts is in progress. The 3.9-meter length RFQ is composed from 5 strongly coupled segments. High-temperature furnace brazing of the segments is planned for the summer of 2011. The RFQ design includes several innovative features such as trapezoidal vane tip modulation, compact output radial matcher to form an axially symmetric beam. The upgrade project also includes development and construction of a cryomodule containing seven 72.75 MHz SC quarter wave cavities designed for the geometrical β= 0.077 and four SC solenoids. The cavity is designed to obtain an accelerating voltage higher than 2.5 MV. The prototype cavity together with high-power capacitive coupler and piezoelectric tuner has been developed, fabricated and is being tested. This paper reports innovative design features of both RFQ and SRF linac and current status of the project.
	Slides THOCN5 [3.070 MB]

FROBN3	Project X - New Multi Megawatt Proton Source at Fermilab	2566
	S. Nagaitsev Fermilab, Batavia, USA
	Fermilab plans to replace its present injection complex consisting of a pulsed linac and 15 Hz Booster with a new injection complex based on a superconducting CW linac. This new proton source should boost the power of the Main Injector to 2 MW and enable new experiments with a high power proton beam in the range of 1-3 GeV. The speaker will present recent developments from the Fermilab Project X R&D.
	Slides FROBN3 [2.018 MB]

FROBN4	Commissioning of the 20MV Superconducting Linac Upgrade at TRIUMF	2570
	M. Marchetto TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
	The Phase II upgrade of the ISAC-II Superconducting Heavy Ion Linac involves the addition of twenty quarter-wave bulk niobium resonators housed in three cryomodules. This addition brings the total installed accelerating voltage from 20MV to 40MV. The cavities are produced in Canadian industry with cavity testing and cryomodule assembly at TRIUMF. The speaker will discuss commissioning of, and operations with, this major upgrade, which commenced in April 2010.
	Slides FROBN4 [3.990 MB]