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Title: PHENIX Results and Initial Stage Implications

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  1. Los Alamos National Laboratory
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC). Nuclear Physics (NP) (SC-26)
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: 4th International Conference on the Initial Stages in High-Energy Nuclear Collisions ; 2017-09-18 - 2017-09-22 ; Krakow, Poland
Country of Publication:
United States
Atomic and Nuclear Physics

Citation Formats

McGlinchey, Darren Craig. PHENIX Results and Initial Stage Implications. United States: N. p., 2017. Web.
McGlinchey, Darren Craig. PHENIX Results and Initial Stage Implications. United States.
McGlinchey, Darren Craig. 2017. "PHENIX Results and Initial Stage Implications". United States. doi:.
title = {PHENIX Results and Initial Stage Implications},
author = {McGlinchey, Darren Craig},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2017,
month =

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  • The low power checkout of the Repetitive High Energy Pulsed Power (RHEPP) pulse forming line (PFL) and linear induction voltage adder (LIVA) is complete. The accelerator has four LIVA cavities driven via coaxial cables from the PFL that utilizes magnetic switching to provide a 250-kV, 60-ns output pulse. The PFL is repetitively charged by a ten stage Marx generator to operate from single shot to five Hz. Results from these tests of the initial four stage RHEPP accelerator are presented and compared with design simulations. Data from a resistive cavity load and from preliminary electron diode experiments are included. Whilemore » core temperatures remain low during five Hz operation, they are monitored and compared to extrapolated predictions from the design modeling. Performance of the Metglas magnetic switches and blocking cores, the voltage addition in the four LIVA cavities, and system efficiencies are discussed. Sources of discrepancies from the original design models are identified, and improved models that account for the discrepancies are presented. Improved performance potential based on these models is discussed. Plans for future testing of the 1-MV system up to 120 kW at 120 Hz and for the full system with ten LIVA cavities are presented.« less
  • Intrusion of the 1,700 Ma Harney Peak Granite, southern Black Hills, South Dakota resulted in the formation of a large thermal aureole reaching second-sillimanite grade metamorphism and local migmatization. [sup 40]Ar/[sup 39]Ar ages for micas were obtained from staurolite-zone country rock samples collected over a wide region surrounding the pluton. Excess argon appears to be a problem in only one sample which exhibited a total gas age much older than the pluton. A sample ([number sign]87) located [approximately]15 km SW of the pluton yielded a biotite near-plateau age (and concordant total gas age) of 1,669[+-]16 Ms. Muscovite from the samplemore » yielded a concordant plateau and total gas age of 1,648[+-]12 Ma. The concordant mica pair ages (within error) suggests cooling from above [approximately]350 C to below [approximately]300 C about 30--40 Ma after intrusion of the main pluton. Five separates from three localities (W and NW of the pluton) yield concordant plateau and near-plateau mica ages which cluster around 1,620--1,630 Ma ages as having been reset after initial cooling to below [approximately]300 C at about 1,660 Ma. Since no igneous activity of this age has been reported in the Black Hills, the authors favor a resetting event associated with a low-grade metamorphic event long recognized regionally east and west of the Black Hills and perhaps visibly represented within the Black Hills by a late (post-Harney Peak Granite) widespread but non-penetrative (F4) foliation.« less