Beam Dynamics Design of a 162.5 MHz Superconducting RFQ Accelerator (original) (raw)
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Application of rf superconductors to linacs for high-brightness proton beams
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1989
A series of superconducting structures for the acceleration of high-current ion beams is being developed, and two prototype Nb cavities are under construction. These cavities operate in a frequency-velocity range which, for superconducting structures, has been little explored: frequencies of 0.4 GHz to more than 1 GHz, and velocities of 0.1~ to 0.5~. Issues discussed include: need for strong beam loading ( -104), need for strong focusing elements located close to the cavities, minimization of beam impingement and beam instabilities.
Intense Microwave and Particle Beams III, 1992
Rec_ntprogress inan ongoing development programleading tothedesign ofsuperconducting continuouswave (ew) linear accelerators for. high-brightness ion beams is reviewed. A new spoke-resonator geometry haeorporating a half-wavelength resonant line was fabricated and tested. This geometry serves as the basis for the constituent cavities of a superconducting section being designed for high-current testing with a deuterium beam. Considerable progress has been made in the design of this section. A multi-phased program leading to the development of a superconducting radio-frequency quadrupole (SCRFQ) has been initiated. Design considerations and test results from the various activities are presented.
Design Considerations for High-Current Superconducting RFQ's
1994
Superconducting linacs may be a viable option for highcurrent applications such as fusion materials irradiation testing, spallation neutron source, transmutation of radioactive waste, tritium production, and energy production. These linacs must run reliably for many years and allow easy routine maintenance. Superconducting cavities operate efficiently with high cw gradients, properties which help to reduce operating and capital costs, respectively. However, cost-effectiveness is not the sole consideration in these applications. For example, beam impingement must be essentially eliminated to prevent unsafe radioactivation of the accelerating structures, and thus large apertures are needed through which to pass the beam. Because of their high efficiency, superconducting cavities can be designed with very large bore apertures, thereby reducing the effect of beam impingement. Key aspects of high-current cw superconducting linac designs are explored in this context.
A development program is underway to apply rf superconductivity to the design of continuous-wave (cw) linear accelerators for high- brightness ion beams. Since the last workshop, considerable progress has been made both experimentally and theoretically toward this application. Recent tests of niobium resonators for ion acceleration have yielded average accelerating gradients as high as 18 MV/m. In an experiment with a radio-frequency quadrupole geometry, niobium was found to sustain cw peak surface electric fields as high as 128 MV/m over large (10 cm{sup 2}) surface areas. Theoretical studies of beam impingement and cumulative beam breakup have also yielded encouraging results. Consequently, a section of superconducting resonators and focusing elements has been designed for tests with high-current deuteron beams. In addition, considerable data pertaining to the rf properties of high-{Tc} superconductors has been collected at rf-field amplitudes and frequencies of interest in connec...
Design of a Proton Superconducting Linac for a Neutron Spallation Source
1999
We describe the design of a pulsed superconducting linac that accelerates a 2-mA average current beam of H ions from 0.2 to 1 GeV. This design would replace the normalconducting linac design of the pulsed, 6% duty factor US Spallation Neutron Source (SNS) with superconducting cavities above an energy of about 200 MeV. The design takes advantage of the large velocity acceptance of the superconducting cavities to cover the velocity range from about 200 MeV to 1 GeV with only two elliptical cavity shapes. Comparing this design with the baseline 805-MHz normal-conducting design, the superconducting design saves 33 out of 60 2.5-MW klystrons, reduces the overall length of 465 m by 100 m, and reduces the ac power by about 10 MW. We describe the design procedures including the choices of the basic parameters, design of the cavity shapes, and beam dynamics and mechanical analyses.
STUDY OF A SUPERCONDUCTING 100 MEV LINEAR ACCELERATOR FOR EXOTIC BEAM PRODUCTION
An ISCL (Independent Superconducting Cavity Linac) able to accelerate a 5 mA CW proton beam up to 100 MeV has been studied at LNL. Such a linac can be used as the first stage of a high energy proton linac or as a stand alone machine. The first application is considered for the 1 GeV primary linac of a European facility for the production of exotic beams (EURISOL project), while as stand alone machine it can be used for a smaller facility, for example at LNL. The main advantages of this linac (respect to a normal conducting accelerator) are the low power consumption, the large bore hole and the possibility to accelerate ions with different M/q (up to 3-4) with almost the same final energy per charge.
Superconducting RF Development at Nuclear Science Centre
Proceedings of the 2005 Particle Accelerator Conference
A Superconducting Linac is being installed as a booster for the 15 UD Pelletron accelerator at Nuclear Science Centre (NSC). The accelerating structure for this linac is a Nb QWR cavity, designed and fabricated as a joint collaboration between NSC and ANL, USA. Initial cavities required for the first linac module were fabricated at ANL. For fabrication of cavities required for future modules a Superconducting Resonator Fabrication Facility has been set up at NSC. Three quarter wave resonator (QWR) cavities have been fabricated using the in-house facility. This facility has been used for repairs on the resonators which sprung leaks. Fabrication of fifteen resonators for the second and third linac modules is under progress. Eight resonators along with a superconducting solenoid has been installed in the first linac cryostat and tested for energy gain with a pulsed beam of 90 MeV Si from the Pelletron. Acceleration of the ions to 96 MeV was measured downstream and beam transmission through the linac was measured to be 1 00%.
Assessment of the basic parameters of the CERN Superconducting Proton Linac
Physical Review Special Topics - Accelerators and Beams, 2009
The construction of a 4GeV Superconducting Proton Linac (the SPL) is now part of the Long Term Plan of CERN, and the construction of Linac4, its low-energy front end, has begun. For mid-2011 the existing conceptual design of the SPL has to be refined and transformed into a project proposal. As a first step, basic parameters like RF frequency, accelerating gradient and operating temperature of the superconducting cavities have been re-assessed, taking into account the experience accumulated in the world during the recent years, especially for the SNS and the ILC projects. The conclusions confirm the validity of the initial choices, namely the RF frequency of 704.4MHz and the cooling temperature of ≈ 2K. However the assumed gradients are estimated as optimistic: additional tests are necessary during the coming years to properly define the values to be used in the SPL design. This analysis is documented and its results are explained in this report.