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• W2117131345 abstract "COMMISSIONING OF THE SNS FRONT-END SYSTEMS AT BERKELEY LAB* R. Keller, J.J. Ayers, L. Doolittle, J.B. Greer, S. Lewis, C. Lionberger, M. Monroy, J. Pruyn, A. Ratti, J.W. Staples, D. Syversrud, and R. Thomae Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA, USA A. Aleksandrov for the SNS Accelerator Physics Group and T. Shea for the SNS Diagnostics Collaboration Spallation Neutron Source (SNS)** at Oak Ridge National Laboratory, Oak Ridge, TN, USA Abstract Construction of a 2.5-MeV linac injector, the Front-End (FE) for the Spallation Neutron Source (SNS) project, was completed in the spring of 2002. Of the major FE subsystems, the rf-driven H - ion source, the electrostatic LEBT, and the first of four RFQ modules had been com- missioned by the spring of 2001, and commissioning of the remaining RFQ modules as well as the full system in- cluding the elaborate MEBT was carried out in Jan. through May, 2002. The Front End will be shipped to Oak Ridge, starting in June, 2002, and re-commissioned after installation at the SNS site. This paper gives an overview of FE major design features and experimental results ob- tained during the commissioning process at LBNL. and personnel from these laboratories as well as from SNS-ORNL participated in the commissioning. The SNS Front-End project has been described in detail elsewhere with an ample collection of references [2, 3] and the pres- ent paper emphasizes the latest design features and com- missioning results. Beam chopping is performed by two separate chopper systems located in LEBT and MEBT, respectively. The LEBT chopper removes most of the beam power during the mini-pulse gaps, and the MEBT chopper reduces the rise and fall time of the transported beam to 10 ns. The main nominal parameters for the SNS Front End are listed in Table 1. The front end was assembled and commissioned at the Integrated Testing Facility at LBNL and will be shipped to ORNL in the summer of 2002. 1 INTRODUCTION The SNS accelerator systems are comprehensively dis- cussed elsewhere [1]. They aim at delivering intense pro- ton-beam pulses of less than 1-µs duration to the spalla- tion target at 60-Hz repetition frequency and with an av- erage beam power of 1.44 MW. The 1-ms long H - macro pulses that are accelerated by the linac to 1-GeV energy have to be chopped at about 1 MHz frequency into ‘mini pulses’ of 645-ns duration, with 300-ns gaps. LBNL has built the front end (linac injector) with its main beamline elements consisting of ion source, low- energy beam-transport section (LEBT), RFQ accelerator, and medium-energy beam-transport section (MEBT), as well as the ancillary systems needed to operate them. The beamline, without ancillary systems, is shown in Fig. 1. Some parts of the SNS front end, i.e. the rf power system for the RFQ and the MEBT chopper structures and their power supplies, were supplied by LANL; some diagnostic elements and associated electronics by LANL and BNL, 2 ION SOURCE AND LEBT Extensive details on ion source and LEBT design and further development efforts are given elsewhere [4]. The ion-source plasma is sustained by pulsed 2-MHz-rf power and confined by a multi-cusp magnet configuration. Pulse ignition is facilitated by maintaining a continuous, low- density plasma, driven by a separate 13.56-MHz genera- tor. A magnetic dipole filter separates the main plasma from a smaller H - production region where low-energy electrons help generating copious amounts of negative ions. A heated collar, equipped with eight cesium dis- pensers, surrounds this H - production volume, and a very thin (about 1/2 mono layer) coating of cesium on the col- lar and outlet-electrode surfaces enhances the extracted beam current by a factor of three for a given rf power. The outlet plate of the ion source contains a dipole- magnet configuration that creates a transverse deflecting field across the extraction gap, separates the extracted * Work supported by the Director, Office of Science, Basic Energy Sciences, US Department of Energy, Contract No. DE-AC03-76SF00098. ** SNS is a collaboration of six US Laboratories: Argonne National Laboratory (ANL), Brookhaven National Laboratory (BNL), Thomas Jefferson National Accelerator Facility (TJNAF), Los Alamos National Laboratory (LANL), E. O. Lawrence Berkeley National Laboratory (LBNL), and Oak Ridge National Laboratory (ORNL). SNS is managed by UT-Battelle, LLC, under contract DE-AC05-00OR22725 for U.S. Department of Energy" @default.
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• W2117131345 date "2002-05-01" @default.
• W2117131345 modified "2023-09-24" @default.
• W2117131345 title "Commissioning of the SNS front-end systems at Berkeley Lab" @default.
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