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The riapmtq/impact beam-dynamics simulation package
T. P. Wangler;R. W. Garnett;J. Qiang;R. Ryne;K. R. Crandall;J. H. Billen;V.N. Aseev;B. Mustapha;P. Ostroumov;M. Doleans;D. Gorelov;X. Wu;R. C. York;Q. Zhao
2007 IEEE Particle Accelerator Conference (PAC)
Year: 2007 | Conference Paper |
The Fortran 90 RIAPMTQ/IMPACT code package is a pair of linked beam-dynamics simulation codes that have been developed for end-to-end computer simulations of multiple-charge state heavy-ion linacs for future exotic-beam facilities. The simulations can extend from the low-energy beam-transport line after the ECR ion source to the end of the linac. The work has been performed by a collaboration incl...Show More
Advanced Beam-Dynamics Simulation Tools for RIA
R.W. Garnett;T.P. Wangler;J.H. Billen;J. Qiang;R. Ryne;K.R. Crandall;P. Ostroumov;R.C. York;Q. Zhao
Proceedings of the 2005 Particle Accelerator Conference
Year: 2005 | Conference Paper |
Cited by: Papers (4)
We are developing multi-particle beam-dynamics simulation codes for RIA driver-linac simulations extending from the low-energy beam transport (LEBT) line to the end of the linac. These codes run on the NERSC parallel supercomputing platforms at LBNL, which allow us to run simulations with large numbers of macroparticles. The codes have the physics capabilities needed for RIA, including transport a...Show More
Particle-beam behavior in the SNS linac with simulated and reconstructed beams
S. Nath;J. Billen;J. Stovall;H. Takeda;L.M. Young;K. Crandall;D. Jeon
Proceedings of the 2003 Particle Accelerator Conference
Year: 2003 | Conference Paper |
Cited by: Papers (1)
The Spallation Neutron Source (SNS) project is a collaborative effort between Brookhaven, Argonne, Jefferson, Lawrence Berkeley, Los Alamos and Oak Ridge National Laboratories. Los Alamos has designed the entire linac for this accelerator complex. The final design of the SNS linac is comprised of both normal- and super-conducting RF (SRF) structures. The normal-conducting linac section up to 185 M...Show More
Continued development of the RFI linac structure
Proceedings of the 2003 Particle Accelerator Conference
Year: 2003 | Conference Paper |
The Rf-Focused Interdigital (RFI) linac structure is under development at Linac Systems. It promises very efficient acceleration of protons, light ions, and heavy ions to tens of MeV in relatively small packages. Recent developments include the discovery of effective geometries for the support of the two-part drift tubes, which provide the rf focusing, and efficient geometries for the end terminat...Show More
Impact of cavity RF field phase and amplitude control uncertainties on the SNS linac
Proceedings of the 2003 Particle Accelerator Conference
Year: 2003 | Conference Paper |
Cited by: Papers (1)
There is an accuracy limit of LLRF control over cavity rf phase and amplitude. This limited accuracy of control gives rise to beam energy and phase jitter, emittance growth, and beam loss. In the case of the SNS linac, there are a few limiting factors such as minimizing injection foil miss, acceptable ring injection painting, and beam loss in the linac which are related with the LLRF control error...Show More
Longitudinal tune-up of SNS normal conducting linac
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)
Year: 2001 | Conference Paper |
Cited by: Papers (1)
DTL of SNS linac accelerates the 2.5 MeV H/sup -/ beam from the RFQ and the MEBT to 86 MeV. For longitudinal setpoint, two standard phase scan methods will be used, because they are complementary. Numerical simulation using the Parmila code indicates that only the phase scan with the absorber and collector is effective for DTL tank 6. But for the rest of the DTL tanks, both methods are effective.Show More
Conceptual design of a low-/spl beta/ SC proton linac
R.W. Garnett;T.P. Wangler;F.L. Krawczyk;J.P. Kelley;K.R. Crandall
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)
Year: 2001 | Conference Paper |
Cited by: Papers (1)
In this paper we discuss the conceptual design of a low-/spl beta/ superconducting proton linac based on multi-gap spoke resonator structures. We have demonstrated the feasibility of using superconducting accelerating structures throughout a proton linac for high-peak current applications. The injection energy for this linac is assumed to be 6.7 MeV, which equals the output energy of the CW RFQ bu...Show More
Experimental study of proton-beam halo induced by beam mismatch in LEDA
T.P. Wangler;C.K. Allen;K.C.D. Chan;P.L. Colestock;K.R. Crandall;R.W. Garnett;D. Gilpatrick;W. Lysenko;J. Qiang;J.D. Schnieder;M.E. Schulze;R.L. Sheffield;H.V. Smith
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)
Year: 2001 | Conference Paper |
Cited by: Papers (6)
We report measurements of transverse beam halo in mismatched proton beams in a 52-quadrupole FODO transport channel following the 6.7-MeV LEDA RFQ. Beam profiles in both transverse planes are measured using beam-profile diagnostic devices that consist of a movable carbon filament for measurement of the dense beam core, and scraper plates for the halo measurement. The gradients of the first four qu...Show More
Successful high power test of a proton linac booster (LIBO) prototype for hadrontherapy
B. Szeless;P. Berra;E. Rosso;M. Vretenar;U. Amaldi;K.R. Crandall;D. Toet;M. Weiss;R. Zennaro;C. Cicardi;D. Giove;C. De Martinis;D. Davino;M.R. Masullo;V.G. Vaccaro
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)
Year: 2001 | Conference Paper |
Cited by: Papers (1)
The linac booster (LIBO) project aims to build a 3 GHz proton linac to give the beam from 50-70 MeV cyclotrons, which exist in several laboratories and hospitals, a final energy of 200 MeV. This will allow the treatment of deep-seated tumours. A prototype of the first LIBO module was designed, constructed and RF tested by a collaboration of CERN, University and INFN of Milan, University and INFN o...Show More
Characterization of the proton beam from the 6.7 MeV LEDA RFQ
M.E. Schulze;C.K. Allen;P.L. Colestock;J.D. Gilpatrick;W. Lysenko;L.J. Rybarcyk;J.D. Schneider;R.L. Sheffield;H.V. Smith;T.P. Wangler;K.R. Crandall
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)
Year: 2001 | Conference Paper |
Cited by: Papers (3)
The present configuration of the Low-Energy Demonstration Accelerator (LEDA) consists of a 75-keV proton injector, a 6.7-MeV 350-MHz cw radio-frequency quadrupole (RFQ) with associated high-power and low level rf systems, a 52-magnet periodic lattice followed by a short high-energy beam transport (HEBT) and high-power (670-kW cw) beam stop. The rms beam emittance was measured prior to the installa...Show More
Expected beam performance of the SNS linac
J. Stovall;J.H. Billen;S. Nath;H. Takeda;L.M. Young;D. Jeon;K.R. Crandall;R. Shafer
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)
Year: 2001 | Conference Paper |
Cited by: Papers (13)
The Spallation Neutron Source (SNS) project is a collaboration among Argonne, Brookhaven, Jefferson, Lawrence Berkeley, Los Alamos and Oak Ridge National Laboratories. The linac, which injects beam into an accumulator ring, is comprised of both normal and superconducting RF (SRF) accelerating structures. Two room-temperature RF structures, a 402.5-MHz drift-tube linac (DTL) and an 805-MHz coupled-...Show More
Comparison of linac simulation codes
S. Nath;J. Qiang;R. Ryne;J. Stovall;H. Takeda;L. Young;K.R. Crandall;N. Pichoff;D. Uriot
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)
Year: 2001 | Conference Paper |
The Spallation Neutron Source (SNS) project is a collaborative effort between Brookhaven, Argonne, Jefferson, Lawrence Berkeley, Los Alamos and Oak Ridge National Laboratories. Los Alamos is responsible for the design of the linac for this accelerator complex. The code PARMILA, developed at Los Alamos is widely used for proton linac design and beam dynamics studies. The most updated version includ...Show More
Measurements of halo generation for a proton beam in a FODO channel
P.L. Colestock;C.K. Allen;K.C.D. Chan;K.R. Crandall;R.W. Garnett;D. Gilpatrick;W. Lysenko;J.D. Schneider;M.E. Schulze;R.L. Sheffield;H.V. Smith;T.P. Wangler
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)
Year: 2001 | Conference Paper |
Cited by: Papers (6)
An experimental effort has been undertaken to investigate the production of halo particles in a proton beam having significant space charge forces. The LEDA RFQ was used to inject a pulsed 6.7 MeV 15-75 mA beam into a linear FODO channel. Four matching quads at the input of this 52-quadrupole transport line were used to generate specific mismatch oscillations, believed to be a key mechanism in the...Show More
Room-temperature linac structures for the Spallation Neutron Source
PACS2001. Proceedings of the 2001 Particle Accelerator Conference (Cat. No.01CH37268)
Year: 2001 | Conference Paper |
Cited by: Papers (5)
Los Alamos National Laboratory is building room-temperature rf accelerating structures for the Spallation Neutron Source (SNS). These structures, for H/sup i/ons, consist of six 402.5 MHz, 2 MW drift-tube linac (DTL) tanks from 2.5 to 87 MeV followed by four 805 MHz, 4 MW coupled-cavity linac (CCL) modules to 186 MeV. The DTL uses permanent magnet quadrupoles inside the drift tubes arranged in a 6...Show More
Development of a commissioning plan for the APT linac
M.E. Schulze;B. Blind;K.C.D. Chan;J.D. Gilpatrick;G. Lawrence;S. Nath;A.H. Regan;L.J. Rybarcyk;T.P. Wangler;L. Young;A. Browman;K.R. Crandall;L.W. Funk
Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)
Year: 1999 | Conference Paper |
Cited by: Papers (2)
The Accelerator Production of Tritium (APT) facility utilizes a high-intensity CW linear accelerator consisting of both normal-conducting and superconducting (SC) RF structures to accelerate a 100-mA CW proton beam to an energy of between 1030 and 1700 MeV depending upon tritium production needs. The accelerator will be commissioned in stages defined by these different normal and superconducting m...Show More
Beam dynamics design and simulation studies of the APT superconducting linac
Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366)
Year: 1999 | Conference Paper |
Our design approach takes advantage of the large velocity acceptance of the superconducting cavities. As a guide to an initial layout, an analytic model of multi-cell cavities excited in a n-mode was used to provide an expression for the transit-time factor as a function of particle velocity. A simple cavity-field distribution was assumed where the fields are uniform in the accelerating gaps and z...Show More
Status of the RFD linac prototype
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)
Year: 1997 | Conference Paper |
A 2.5-MeV prototype of a "Compact 12-MeV Proton Linac for PET Isotope Production" is under construction at Linac Systems. This unit will serve as the "proof of principle" for the revolutionary new RF Focused Drift tube (RFD) linac structure. Both the prototype and the production unit will operate at 600 MHz. The prototype comprises a 25-keV proton ion source, an einzel-lens-based LEBT, a 0.65-m-lo...Show More
New high power linacs and beam physics
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)
Year: 1997 | Conference Paper |
Cited by: Papers (4)
New high-power proton linacs must be designed to control beam loss, which can lead to radioactivation of the accelerator. The threat of beam loss is increased significantly by the formation of beam halo. Numerical simulation studies have identified the space-charge interactions, especially those that occur in rms mismatched beams, as a major concern for halo growth. The maximum-amplitude predictio...Show More
Further improvements in TRACE 3-D
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)
Year: 1997 | Conference Paper |
Cited by: Papers (1)
TRACE 3-D, an interactive beam-dynamics program that calculates the envelopes of a bunched beam (including linear space-charge forces) through a user-defined transport system, has undergone several upgrades in physics, coding, and capabilities. Recent modifications include centroid tracking (and misalignment capabilities) and an improved beam description that allows study of some nonlinear effects...Show More
Commissioning plan for a high-current proton linac
K.C.D. Chan;R.L. Barber;R.W. Garnett;J.D. Gilpatrick;K.F. Johnson;G.P. Lawrence;S. Nath;A. Regan;L. Rybarcyk;R.E. Shafer;H.V. Smith;T.P. Wangler;L.M. Young;L.W. Funk;K. Crandall
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)
Year: 1997 | Conference Paper |
Cited by: Papers (3)
High-power proton linacs (E>500 MeV) are potentially useful for transmutation applications, such as the production of tritium, In production applications, high availability is essential. Achieving high availability requires an accelerator design that simplifies maintenance and accommodates commissioning procedures designed to minimize tune-up time. These are worthwhile goals for any accelerator, b...Show More
Beam dynamics aspects for the APT integrated linac
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)
Year: 1997 | Conference Paper |
Cited by: Papers (2)
The accelerator-based production of tritium calls for a high-power cw proton linac. The current Los Alamos design uses an integrated approach in terms of accelerating structure. The front part of the accelerator uses normal-conducting (NC) structures while most (>80%) of the linac structure is superconducting (SC). Here, we report the beam-dynamics rationale used in the integrated design and prese...Show More
Development of the RFD linac structure
D.A. Swenson;K.R. Crandall;F.W. Guy;J.W. Lenz;A.D. Ringwall;L.S. Walling
The new RF-focused drift-tube (RFD) linac structure resembles a drift tube linac (DTL) structure with RF quadrupole (RFQ) focusing incorporated into each "drift tube". As in the conventional DTL structure, these drift tubes are supported on single stems along the axis of a cylindrical cavity excited in the TM/sub 010/ RF cavity mode. Four electrodes of each drift tube couple energy from the primar...Show More
Beam halo formation from space-charge dominated beams in uniform focusing channels
Proceedings of International Conference on Particle Accelerators
Year: 1993 | Conference Paper |
Cited by: Papers (19)
In space-charge dominated beams the nonlinear space-charge forces produce a filamentation pattern, which results in a 2-component beam consisting of an inner core and an outer halo. The halo is very prominent in mismatched beams/sup 1-3/ and is a concern because of the potential for accelerator activation. We present new results about beam halo and the evolution of space-charge dominated beams fro...Show More
Error and tolerance studies for the SSC Linac
D. Raparia;Chu Rui Chang;F. Guy;J.W. Hurd;W. Funk;K.R. Crandall
Proceedings of International Conference on Particle Accelerators
Year: 1993 | Conference Paper |
Cited by: Papers (3)
This paper summarizes error and tolerance studies for the SSC Linac. These studies also include higher-order multipoles. The codes used in these simulations are PARMTEQ, PARMILA, CCLDYN, PARTRACE, and CCLTRACE.<>Show More
Construction of a superconducting RFQ structure
Proceedings of International Conference on Particle Accelerators
Year: 1993 | Conference Paper |
This paper reports the design and construction status of a niobium superconducting RFQ operating at 194 MHz. The structure is of the rod and post type, novel in that each of four rods is supported by two posts oriented radially with respect to the beam axis. Although the geometry has four-fold rotation symmetry, the dipole-quadrupole mode splitting is large, giving good mechanical tolerances. The ...Show More
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