Pickoff and Transport of a 1 GeV Proton Beam from the Spallation Neutron Source to an ISOL Target
Critical to the success of an ISOL facility based on the Spallation Neutron Source (SNS) is a highly reliable and efficient method to separate and utilize a small, variable fraction (lO%) of the full energy beam from the SNS linac. As a guiding principle of this study, we recognize the need to accomplish this separation in a manner transparent to the neutron science program. This applies equally to the design, construction and operational phases of the SNS as well as the proposed future upgrades of the facility to higher power levels. A schematic layout of the SNS is given which shows the control footprint of an upgraded facility incorporating two accumulator rings and two neutron-generating target systems. In the initial phase of the SNS, only one ring and one target station will be built and the total beam power will be 1 MW. An upgrade path has been identified to extend the performance of the facility first to 2 MW and subsequently to 4 W, the second ring is needed in the upgrade from 2 to 4 MW. Space reserved for a future ISOL facility. It is assumed that the ISOL facility will be built concurrently with the initial construction phase of the SNS. Care will be taken to ensure that there is no interference between the ISOL facility and the second (future) SNS accumulator ring. The SNS accelerates a beam of H- ions to the full final energy of 1 GeV in a 60 Hz rf linac and delivers it via a high energy beam transport (HEBT) line to an accumulator ring for pulse compression and subsequent delivery of a short pulse to the target. At the end of the HEBT, the beam is converted to H+ by passing it through a thin carbon stripper foil as it is injected into the ring. The proposed location for the ISOL pickoff is in the upstream portion of the HEBT, approximately 15 m downstream from the linac exit. A cost summary for early design/fabrication/installation of proton pickoff components is given.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 6442
- Report Number(s):
- LBNL-42311; ON: DE00006442
- Country of Publication:
- United States
- Language:
- English
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