Production of a thin diamond target by laser for HESR at FAIR

5th Target Fabrication Workshop

Balestra, F.^1,2 ; Ferrero, S.^1 ; Introzzi, R.^1,2 ; Pirri, F.^1 ; Scaltrito, L.^1 ; Younis, H.^3

Department of Applied Science and Technology, Politecnico di Torino, c.so Duca degli Abruzzi 24, Torino

10129, Italy^1

INFN- Sezione di Torino, C/o Politecnico di Torino, c.so Duca degli Abruzzi 24, Torino

10129, Italy^2

Department of Physics, COMSATS Institute of Information Technology, Park Road, Islamabad

44000, Pakistan^3

关键词: Carbon phasis;    Experimental requirements;    Impurity level;    Internal targets;    Micro Raman Spectroscopy;    Momentum range;    Phase modification;    Radiation hardness;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/713/1/012003/pdf
DOI  :  10.1088/1742-6596/713/1/012003

来源: IOP

【 摘 要 】

In the future hadron facility FAIR, the HESR ring will supply antiprotons in the momentum range 1.5-15 GeV/c as projectiles to study charm, strangeness and a wide range of other Physics topics. For all these reactions it will be necessary to use internal targets and in particular, for the production of systems with double strangeness, a solid12C target will be used. Inserting a solid target inside an antiproton ring creates two main problems: a large background on the detectors due to the overwhelming amount of annihilations and a strong depletion of the beam due to all the hadronic and Coulomb interactions of the antiprotons with the12C nuclei. The width of the target plays a crucial role in minimizing these unwanted effects. Two wire-shaped prototypes have been already realized, starting from a thin diamond disk. The wire shape has been obtained by using a femto-edge laser. One prototype has been submitted to irradiation by protons of 1.5 MeV and to simultaneous Back-Scattering control to test the impurity level, the12C density, the radiation hardness and possible phase modifications during irradiation. Both the prototypes have been submitted to Micro-Raman spectroscopy in order to scan the carbon phases along the width. The results show performances which satisfy the experimental requirements.