MUSIC - Past, Presence, and Future of a detector concept Walter F.J. Müller, GSI Bormio 2004

XLII Winter Meeting, Bormio, January 26 - February 1, 2004 MUSIC - Past, Presence, and Future of a Detector Concept Walter F.J. Müller, GSI2 Multiple Sampling Ionization Chamber A tracking chamber with good charge resolution Used for projectile-like fragments in relativistic heavy ion reactions TargetMagnet Tracking TOF Energy loss α Z 2 Bending α 1/R = Z/p Beam: C…U typ. 1 A GeV

XLII Winter Meeting, Bormio, January 26 - February 1, 2004 MUSIC - Past, Presence, and Future of a Detector Concept Walter F.J. Müller, GSI3 Energy Loss vs. Energy Deposition I Energy loss is by Rutherford scattering on electrons Low impact parameter collisions give high energy electrons (Delta rays) Energy is transported away from ion track and deposited far away from the track Simulation Ar 600 A MeV in P10 gas

XLII Winter Meeting, Bormio, January 26 - February 1, 2004 MUSIC - Past, Presence, and Future of a Detector Concept Walter F.J. Müller, GSI4 Energy Loss vs. Energy Deposition II For Z=1: Landau tail Use truncated mean For Z>6 energy deposition distribution roughly gaussian Width depends on effective Delta cut-off energy segment anodes short shaping times MUSIC Fraction of total energy in Delta rays with E > E cut 600 A MeV

XLII Winter Meeting, Bormio, January 26 - February 1, 2004 MUSIC - Past, Presence, and Future of a Detector Concept Walter F.J. Müller, GSI5 MUSIC I: Measure Charge (LBL 1984) To sampling ADCs Frisch Grid Cathode Field Cage Anode PreAmp Shaper Drift Field time amplitude Z=9 Z=6 Z=12 2cm 1.5 m 60 IC samples Side view

XLII Winter Meeting, Bormio, January 26 - February 1, 2004 MUSIC - Past, Presence, and Future of a Detector Concept Walter F.J. Müller, GSI6 MUSIC I: Not a piccolo pezzo 1/16 inch

XLII Winter Meeting, Bormio, January 26 - February 1, 2004 MUSIC - Past, Presence, and Future of a Detector Concept Walter F.J. Müller, GSI7 MUSIC I Performance ΔZ = 0.3 (FWHM)

XLII Winter Meeting, Bormio, January 26 - February 1, 2004 MUSIC - Past, Presence, and Future of a Detector Concept Walter F.J. Müller, GSI8 MUSIC II: 3d Tracking (GSI/LBL 1987) Cathode Anodes Drift Field Horizontal Drift Horizontal Drift Vertical Drift 3 x 16 IC samples Top view

XLII Winter Meeting, Bormio, January 26 - February 1, 2004 MUSIC - Past, Presence, and Future of a Detector Concept Walter F.J. Müller, GSI9 MUSIC II 1 m 60 cm 2 m

XLII Winter Meeting, Bormio, January 26 - February 1, 2004 MUSIC - Past, Presence, and Future of a Detector Concept Walter F.J. Müller, GSI10 MUSIC II Performance ΔZ = 0.24 (FWHM) Ni 1.9 A GeV Au 1.0 A GeV ΔZ = 0.4 (FWHM)

XLII Winter Meeting, Bormio, January 26 - February 1, 2004 MUSIC - Past, Presence, and Future of a Detector Concept Walter F.J. Müller, GSI11 From LBL to GSI

XLII Winter Meeting, Bormio, January 26 - February 1, 2004 MUSIC - Past, Presence, and Future of a Detector Concept Walter F.J. Müller, GSI12

XLII Winter Meeting, Bormio, January 26 - February 1, 2004 MUSIC - Past, Presence, and Future of a Detector Concept Walter F.J. Müller, GSI13

XLII Winter Meeting, Bormio, January 26 - February 1, 2004 MUSIC - Past, Presence, and Future of a Detector Concept Walter F.J. Müller, GSI14

XLII Winter Meeting, Bormio, January 26 - February 1, 2004 MUSIC - Past, Presence, and Future of a Detector Concept Walter F.J. Müller, GSI15 MUSIC III: Detect Z2 (GSI 1993) Cathode Anodes Drift Field Proportional Counters 32 IC layers 3 prop layers

XLII Winter Meeting, Bormio, January 26 - February 1, 2004 MUSIC - Past, Presence, and Future of a Detector Concept Walter F.J. Müller, GSI16 MUSIC III Geometry Anodes Props 2 m 1 m

XLII Winter Meeting, Bormio, January 26 - February 1, 2004 MUSIC - Past, Presence, and Future of a Detector Concept Walter F.J. Müller, GSI17 MUSIC III Proportional Counters X 1 X 6 X 36 X 1 X 6 X 36 3 Ranges to 10 bit eff. Sampling ADC PreAmpShaper Anode wires Resistive charge division readout dynamic range: 1:10000

XLII Winter Meeting, Bormio, January 26 - February 1, 2004 MUSIC - Past, Presence, and Future of a Detector Concept Walter F.J. Müller, GSI18 MUSIC III: The tracker for ALADiN U A GeV ΔZ = 0.6 (FWHM) for sum charge of two fission fragments Charge pickup channel Target

XLII Winter Meeting, Bormio, January 26 - February 1, 2004 MUSIC - Past, Presence, and Future of a Detector Concept Walter F.J. Müller, GSI19 MUSIC IV: The Conclusion (GSI 2003) Use 4 Prop Counters Use combined charge division plus pad readout Use all new electronics IC layers 3 4 prop layers

XLII Winter Meeting, Bormio, January 26 - February 1, 2004 MUSIC - Past, Presence, and Future of a Detector Concept Walter F.J. Müller, GSI20 MUSIC IV Proportional Counters PreAmp Anode wires Resistive charge division readout Pad readout in groups Low pass ADCFPGADSP

XLII Winter Meeting, Bormio, January 26 - February 1, 2004 MUSIC - Past, Presence, and Future of a Detector Concept Walter F.J. Müller, GSI21 Direct digitization of PreAmp Signal Sampling at 40 MHz 1:3 decimation 13.3 MHz effective rate 14 bit ADC Noise typ. 1 LSB (sigma) Dynamic range 1:10 4 DSP does compressing Shaping and hit finding currently done offline

XLII Winter Meeting, Bormio, January 26 - February 1, 2004 MUSIC - Past, Presence, and Future of a Detector Concept Walter F.J. Müller, GSI22 Digital Filtering Shaping Tail cancelation Prop 1/t tail Soft Delta-rays (time reverse filter) Exchange current cancelation

XLII Winter Meeting, Bormio, January 26 - February 1, 2004 MUSIC - Past, Presence, and Future of a Detector Concept Walter F.J. Müller, GSI23 MUSIC IV: Performance Zn test beam

XLII Winter Meeting, Bormio, January 26 - February 1, 2004 MUSIC - Past, Presence, and Future of a Detector Concept Walter F.J. Müller, GSI24 MUSIC IV: Performance Sn beam Prop Charge Resolution Anode Charge Resolution Online Mass Resolution Z= He 4 He 3 He

XLII Winter Meeting, Bormio, January 26 - February 1, 2004 MUSIC - Past, Presence, and Future of a Detector Concept Walter F.J. Müller, GSI25 Summary 20 years of MUSIC Focus and Priorities evolved: I: Charge II: 3d tracking III: Cover Z 2 IV: Prop Readout / Electronics MUSICs are essential parts in projectile fragmentation setups: MUSIC II at LBL (with HISS/EOS) MUSIC III/IV at GSI (with ALADiN) also at FRS, ….