HITRAP Low Energy Diagnostics and Emittance Measurement
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1 HITRAP Low Energy Diagnostics and Emittance Measurement Jochen Pfister 1, Oliver Kester 2, Ulrich Ratzinger 1, Gleb Vorobjev 3 1 Institut für Angewandte Physik, JW Goethe-University Frankfurt, Germany 2 NCSL/MSU, East Lansing, USA 3 GSI, Darmstadt, Germany Workshop on "Low Current, low Energy Beam Diagnostics" Großsachsen, November 24, 2009 J. Pfister, Institut für Angewandte Physik, Johann Wolfgang Goethe-University Frankfurt 1
2 Outline The HITRAP project at GSI Existing beam diagnostics for emittance measurements and particle detection Measurements and results Outlook J. Pfister, Institut für Angewandte Physik, Johann Wolfgang Goethe-University Frankfurt 2
3 ESR ion sources UNILAC 11.4 MeV/u U MeV/u U 92+ ESR HITRAP LINAC ~20 m long SIS 18 N up to 1 GeV/u U 92+ J. Pfister, Institut für Angewandte Physik, Johann Wolfgang Goethe-University Frankfurt 3
4 HITRAP overview 7m to experiments DDB section IH section & MEBT LEBT & Cooler trap VBL RFQ section 4MeV/u 0.5MeV/u 6keV/u 5keV/q J. Pfister, Institut für Angewandte Physik, Johann Wolfgang Goethe-University Frankfurt 4
5 HITRAP Experiments based on Penning traps Laser spectroscopy g-factor measurements of the bound electron Mass measurements of extreme accuracy Polarization of radionuclides Decay spectroscopy of highly-charged radionuclides Collision experiments: Collisions at very low velocities Surface studies and hollow-atom spectroscopy X-ray spectroscopy J. Pfister, Institut für Angewandte Physik, Johann Wolfgang Goethe-University Frankfurt 5
6 Low energy/low intensity pepperpot device Pepperpot Diamond Energy Analysis stand-alone device multi diagnostic Pepperpot data: hole diameter: 0,1mm (0,1mm W foil) hole spacing: 1mm drift distance: 31,8mm sandwiched between Al frame and 2mm Cu plate J. Pfister, Institut für Angewandte Physik, Johann Wolfgang Goethe-University Frankfurt 6
7 Low energy/low intensity pepperpot device Pepperpot Diamond Energy Analysis stand-alone device multi diagnostic MCP data: diameter: 40mm channel diameter: 12µm gain: 10 4 scintillator: P-43 (λ max =545nm) afterglow (10%): 1ms camera: resolution: 1392x1040pixels ~40µm spatial resolution lens: fixed focus f=50mm, high quality with narrow band pass filter with λ 545nm J. Pfister, Institut für Angewandte Physik, Johann Wolfgang Goethe-University Frankfurt 7
8 Low energy/low intensity pepper pot device Pepperpot Diamond Energy Analysis J. Pfister, Institut für Angewandte Physik, Johann Wolfgang Goethe-University Frankfurt 8
9 Diamond detector Pepperpot Diamond Energy Analysis 4 different seperate diamond layers: poly-crystalline CVD 10/15µm single-crystal CVD 480/380µm poly-crystalline CVD 15µm poly-crystalline CVD 600µm (diameter: 3mm each) J. Pfister, Institut für Angewandte Physik, Johann Wolfgang Goethe-University Frankfurt 9
10 New Energy Analyzer Pepperpot Diamond Energy Analysis 0,3mm slit 0,5T permanent magnet MCP (chevron type) SONY CCD camera x779px x4.65 µm pixel size mirror IH-structure beam dipole 500keV/u >1MeV/u MCP J. Pfister, Institut für Angewandte Physik, Johann Wolfgang Goethe-University Frankfurt 10
11 New Energy Analyzer Pepperpot Diamond Energy Analysis camera viewport MCP dipole J. Pfister, Institut für Angewandte Physik, Johann Wolfgang Goethe-University Frankfurt 11
12 New Energy Analyzer Pepperpot Diamond Energy Analysis Homogeneous field on magnet axis measured with hall probe Drift distance between magnetic field edge and MCP: 95mm Redidual field on axis if magnet out: <1 gauss J. Pfister, Institut für Angewandte Physik, Johann Wolfgang Goethe-University Frankfurt 12
13 Bunch shape measurement macro bunch: 1-3µs from ESR or micro-structured: 108MHz (measured) / 370ps (not resolved) 4MeV/u J. Pfister, Institut für Angewandte Physik, Johann Wolfgang Goethe-University Frankfurt 13
14 Diamond detector Diamond detector: beam is bunched! 9,2 ns J. Pfister, Institut für Angewandte Physik, Johann Wolfgang Goethe-University Frankfurt 14
15 Phase probes Bunched beam detected with phase probe in front of IH-structure phase probes J. Pfister, Institut für Angewandte Physik, Johann Wolfgang Goethe-University Frankfurt 15
16 IH commissioning in 2008/2009 ε 90% = 9,2 π mm mrad 4MeV/u 0.5MeV/u J. Pfister, Institut für Angewandte Physik, Johann Wolfgang Goethe-University Frankfurt 16
17 IH commissioning 2008/ gradient method Pepperpot no signal of 0.5MeV/u beam on either YAG scintillator or P-43 for 3-gradient method or pepperpot measurement 3-gradient method via profile measurements using diamond detector (vertical direction only!) quad slit IH-structure beam steerer >1MeV/u 500keV/u J. Pfister, Institut für Angewandte Physik, Johann Wolfgang Goethe-University Frankfurt 17
18 IH commissioning 2008/ gradient method Pepperpot varying gradient of quadrupole doublett 5 behind IH structure gradient: 51,2T/m 57,6T/m 64T/m J. Pfister, Institut für Angewandte Physik, Johann Wolfgang Goethe-University Frankfurt 18
19 0.5MeV/u emittance 3-gradient method Pepperpot independent evaluation in MS EXCEL and MATLAB shows exactly same result design value at this point: 9,2 π mm mrad ε y,kv = 9,3 π mm mrad α = 1,15 β = 7,80 mm/mrad γ = 0,30 mrad/mm 0,002 0,0015 0,001 0,0005 Y' in [rad] 0-0,01-0,008-0,006-0,004-0, ,002 0,004 0,006 0,008 0,01-0,0005-0,001-0,0015-0,002 Y in [m] J. Pfister, Institut für Angewandte Physik, Johann Wolfgang Goethe-University Frankfurt 19
20 First test of MCP-Pepperpot-Emittance Meter 3-gradient method Pepperpot Measurement behind RFQ (LEBT) Energy mixture: 4MeV/u > E > 6keV/u J. Pfister, Institut für Angewandte Physik, Johann Wolfgang Goethe-University Frankfurt 20
21 Outlook MCP-based energy analysis tests ongoing tune IH-structure based on energy distribution measurements (1)(spring 2010) energy analysis behind RFQ (2) and low energy emittance measurements (3) MeV/u 0.5MeV/u 6keV/u J. Pfister, Institut für Angewandte Physik, Johann Wolfgang Goethe-University Frankfurt 21
22 Thank you for your attention! and thanks to: C. Andre, P. Forck, T. Hofmann, D. Liakin, F. Herfurth, O. Kester, G. Vorobjev U. Ratzinger and everybody that I forgot J. Pfister, Institut für Angewandte Physik, Johann Wolfgang Goethe-University Frankfurt 22
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