Burchard, M.

Dedera, S.

Glasmacher, U. A.

Trautmann, C.

GSI Repository

GSITemplate2007 Installation of diamond window in Paris-Edinburgh press for sample analysis before, during, and after ion irradiation * Michael Burchard1, Ulrich A. Glasmacher1#, Sebastian Dedera1, Christina Trautmann2,31Institute of Earth Sciences, University of Heidelberg, 2GSI Darmstadt, 3Technische Universität Darmstadt To investigate matter under extreme conditions, materi-als have been simultaneously exposed to pressure and ion irradiation. Most experiments have been performed by pressurizing miniature samples (<0.001 mm3) in diamond anvil cells (DAC). Larger samples (up to 1 mm3) can be pressurized in a Paris-Edinburgh (PE) press where the sample in placed between two hard anvils made, e.g., from cubic boron nitride, allowing quasi-hydrostatic compression up to ~ 10 GPa. In the recent past, we successfully tested our PE press as a tool to expose large-volume samples under pressure to energetic heavy ions in Cave A [1]. To perform spectro-scopic investigations of the sample under pressure (ad-vantage of diamond anvil cells), the PE cell anvil was equipped with a diamond stamp in beam direction [1, 2]). This new diamond window (Fig. 1) provides access to a laser beam in order to perform “in situ” Raman spectros-copy measurements of pressurized samples (Fig. 2). Be-sides many handling advantages, the modification also allows us to determine the real pressure inside the PE-cell by means of Raman line shifts (Fig. 3). Figure 1: Cross section of pressure stamp of PE-cell with the new diamond window. For the first test irradiation of the new setup in August 2012 we mounted a calcite crystal (CaCO3) and pressur-ized it to 0.9 GPa. Calcite is quite suitable for this test, because it has well defined Raman bands. The irradiation was performed in cave A at the SIS18 using a focused beam of U ions of 250 MeV/n initial energy. A total flu-ence of 1×1011 ions/cm2 was applied.  The mounting and positioning of the PE cell with the overhead gantry resulted in no further problem. The deac-tivation time of the irradiated PE cell was remarkably short. Most of the activation disappeared two days after the irradiation. After two weeks, the cell could be handled safely. The new setup of the Paris Edinburgh cell provides many new possibilities for “in situ” measurements of ir-radiated samples under pressure, although some design details are still on a preliminary status. Figure 2: Cross section of new PE-cell design, (left) under ion irradiation and (right) for spectroscopic analysis.  Figure 3: Raman spectra of calcite recorded through the new diamond window of the PE cell at ambient pressure (smooth black line and in pressurized state (red line). References [1] M. Burchard et al. “Ion irradiation under pressure us-ing the Paris-Edinburgh press: first results“, GSI Sci-entific Report 2009, p. 345 [2] A New Design for Diamond Window Equipped Paris-Edinburgh-Calls - First Tests and Results, Eos Trans AGU Fall Meet Suppl., Abstract MR23A-2390: * Work supported by BMBF Verbundprojekt 05K10VH1 # ulrich.a.glasmacher@geow.uni-heidelberg.deSteel     diamond window cBNGSI SCIENTIFIC REPORT 2012 PNI-INHOUSE-EXP-30399

Installation of diamond window in Paris-Edinburgh press for sample analysis before, during, and after ion irradiation

http://repository.gsi.de/record/52291/files/PNI-INHOUSE-EXP-30.pdf

Installation of diamond window in Paris-Edinburgh press for sample analysis before, during, and after ion irradiation

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