2011 Particle Accelerator Conference - List of Authors (Leitner, M.)

Paper

Title

Page

DIANA, a Next Generation Deep Underground Accelerator Facility

2552

D. Leitner
NSCL, East Lansing, Michigan, USA
M. Couder, M. Wiescher
Notre Dame University, Notre Dame, Iowa, USA
A. Hodgkinson, A. Lemut, J.S. Saba
LBNL, Berkeley, California, USA
M. Leitner
FRIB, East Lansing, Michigan, USA

Funding: This work was supported by the National Science Foundation NSF-09-500 grant (DUSEL S4), Proposal ID 091728
DIANA (Dakota Ion Accelerators for Nuclear Astrophysics) is a next generation nuclear astrophysics accelerator facility proposed to be built as part of the US DUSEL (Deep Underground Science and Engineering Laboratory) project. The scientific goals of DIANA are focused on experiments related to nucleosynthesis processes. Reaction cross-sections at stellar temperature are extremely low, which makes these experiments challenging. Small signal rates are overwhelmed by large background rates associated with cosmic ray-induced reactions, background from natural radioactivity in the laboratory environment, and the beam-induced background on target impurities. By placing the DIANA facility deep underground (1.4 km) the cosmic ray induced background can be eliminated. In addition, the DIANA accelerator is being designed to achieve large laboratory reaction rates by delivering high ion beam currents (up to 100 mA) to a high density super-sonic jet-gas target (up to 10¹⁸ atoms/cm²). Two accelerators are coupled to enable measurements over a wide energy range from 30 keV to 3 MeVin a consistent manner. The accelerators design and its technical challenges are presented.

Slides FROAN2 [4.231 MB]

WEP293

Design and Fabrication of the Lithium Beam Ion Injector for NDCX-II

2032

J.H. Takakuwa, J.-Y. Jung, J.T. Kehl, J.W. Kwan, M. Leitner, P.A. Seidl, W.L. Waldron
LBNL, Berkeley, California, USA
A. Friedman, D.P. Grote, W. M. Sharp
LLNL, Livermore, California, USA

Funding: This work is performed under the auspices of the U.S. Department of Energy by LBNL under contract DE-AC02-05CH11231.
A 130 keV injector is developed for the NDCX-II facility. It consists of a 10.9 cm diameter lithium doped alumina-silicate ion source heated to ~1300 °C and 3 electrodes. Other components include a segmented Rogowski coil for current and beam position monitoring, a gate valve, pumping ports, a focusing solenoid, a steering coil and space for inspection and maintenance access. Significant design challenges including managing the 3-4 kW of power dissipation from the source heater, temperature uniformity across the emitter surface, quick access for frequent ion source replacement, mechanical alignment with tight tolerance, and structural stabilization of the cantilevered 27” OD graded HV ceramic column. The injector fabrication is scheduled to complete by May 2011, and assembly and installation is scheduled to complete by the beginning of July.

Paper	Title	Page
FROAN2	DIANA, a Next Generation Deep Underground Accelerator Facility	2552
	D. Leitner NSCL, East Lansing, Michigan, USA M. Couder, M. Wiescher Notre Dame University, Notre Dame, Iowa, USA A. Hodgkinson, A. Lemut, J.S. Saba LBNL, Berkeley, California, USA M. Leitner FRIB, East Lansing, Michigan, USA
	Funding: This work was supported by the National Science Foundation NSF-09-500 grant (DUSEL S4), Proposal ID 091728 DIANA (Dakota Ion Accelerators for Nuclear Astrophysics) is a next generation nuclear astrophysics accelerator facility proposed to be built as part of the US DUSEL (Deep Underground Science and Engineering Laboratory) project. The scientific goals of DIANA are focused on experiments related to nucleosynthesis processes. Reaction cross-sections at stellar temperature are extremely low, which makes these experiments challenging. Small signal rates are overwhelmed by large background rates associated with cosmic ray-induced reactions, background from natural radioactivity in the laboratory environment, and the beam-induced background on target impurities. By placing the DIANA facility deep underground (1.4 km) the cosmic ray induced background can be eliminated. In addition, the DIANA accelerator is being designed to achieve large laboratory reaction rates by delivering high ion beam currents (up to 100 mA) to a high density super-sonic jet-gas target (up to 10¹⁸ atoms/cm²). Two accelerators are coupled to enable measurements over a wide energy range from 30 keV to 3 MeVin a consistent manner. The accelerators design and its technical challenges are presented.
	Slides FROAN2 [4.231 MB]

WEP293	Design and Fabrication of the Lithium Beam Ion Injector for NDCX-II	2032
	J.H. Takakuwa, J.-Y. Jung, J.T. Kehl, J.W. Kwan, M. Leitner, P.A. Seidl, W.L. Waldron LBNL, Berkeley, California, USA A. Friedman, D.P. Grote, W. M. Sharp LLNL, Livermore, California, USA
	Funding: This work is performed under the auspices of the U.S. Department of Energy by LBNL under contract DE-AC02-05CH11231. A 130 keV injector is developed for the NDCX-II facility. It consists of a 10.9 cm diameter lithium doped alumina-silicate ion source heated to ~1300 °C and 3 electrodes. Other components include a segmented Rogowski coil for current and beam position monitoring, a gate valve, pumping ports, a focusing solenoid, a steering coil and space for inspection and maintenance access. Significant design challenges including managing the 3-4 kW of power dissipation from the source heater, temperature uniformity across the emitter surface, quick access for frequent ion source replacement, mechanical alignment with tight tolerance, and structural stabilization of the cantilevered 27” OD graded HV ceramic column. The injector fabrication is scheduled to complete by May 2011, and assembly and installation is scheduled to complete by the beginning of July.