Largearea beam tracking detectors for fast extracted beams

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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

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Detectors for NUSTAR facility

• Ion tracking
• Beam profile measurements
• Beam position measurements
• Different approach for beam intensity regions1
  105 Individual ion tracking105 109
  Beam profile mesurements in low pressure gas109
  1012 Beam profile measuremnts in vacuum

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Detector choice

• Our preference gas detectors
• Reasons
• Experience
• Wide variety of gas detectors
• Possibility to cover large sensitive areas
• Reasonable prices

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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

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Scheme of TPC with delay line readout
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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

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Scheme of the beam MWPC
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Beam MWPC with electronics
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TPCs on the holders ready for beam pipe
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Measured time structure of the beam
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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

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Bunch Shape Monitor with wire target
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Bunch Shape Monitor
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Ionization beam Profile Monitor
Scheme of IPM for beam horizontal profile
measurements
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Residual Gas profile Monitor
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C-probe Beam Position Monitor
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Bratislava Detector Lab winding machine
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Bratislava Detector Lab assembly system
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Bratislava Detector Lab test bench