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Large -area beam tracking detectors for fast extracted beams. B.Sitar, R.Janik, M.Pikna, P.Strmen, I Szarka Comenius University Bratislava DIRACsecondary-Beams meeting GSI Darmstadt 14-15 April 2005. Detectors for NUSTAR facility. Ion tracking Beam profile measurements
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Large-area beam tracking detectors for fast extracted beams B.Sitar, R.Janik, M.Pikna, P.Strmen, I Szarka Comenius University Bratislava DIRACsecondary-Beams meeting GSI Darmstadt 14-15 April 2005 B.Sitar
Detectors for NUSTAR facility • Ion tracking • Beam profile measurements • Beam position measurements • Different approach for beam intensity regions:1 – 105 Individual ion tracking105 – 109 Beam profile mesurements in low pressure gas109 – 1012 Beam profile measuremnts in vacuum B.Sitar
Detector choice • Our preference: gas detectors • Reasons: • Experience • Wide variety of gas detectors • Possibility to cover large sensitive areas • Reasonable prices B.Sitar
Individual ion tracking Experience with TPC trackers at FRS: • Several types of TPC were buit and used for FRS • TPC - reliable detector used in many experiments during 10 years • Low amount of material in the beam area B.Sitar
Beam profile measurements Multiwire Proportional(Ionization) Chamber • Low pressure 0 – 1 bar • Working with low gas gain up to 1 • Low amount of material in the beam area • Fast flash type electronics B.Sitar
Scheme of the beam MWPC B.Sitar
Beam MWPC with electronics B.Sitar
Beam profile monitors for very high intensities • Fluxes over 109 ions / bunch • Beam profile monitors working in vacuum • Secondary electron emission • Light emission • Residual gas ionization • Charge induction B.Sitar
Bunch Shape Monitor B.Sitar
Ionization beam Profile Monitor Scheme of IPM for beam horizontal profile measurements B.Sitar
Residual Gas profile Monitor B.Sitar
C-probe Beam Position Monitor B.Sitar