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Innovations in SOFIA MUSIC Design: Enhancements for Timely and Accurate Positioning

This document outlines the advancements and design specifications for the SOFIA MUSIC system. It focuses on integrating high-speed amplifiers to enhance accuracy in timing and positioning determinations. Key challenges addressed include improving mechanical and electrical stability, reducing noise, and optimizing housing for better performance. A detailed overview of the compact and lightweight design, along with CAD models and assembly considerations, is provided. The aim is to meet future FAIR needs while ensuring fast operations and high precision.

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Innovations in SOFIA MUSIC Design: Enhancements for Timely and Accurate Positioning

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  1. The (SOFIA) NewMUSICDesignBernd VossGSI Helmholtzzentrum fürSchwerionenforschung GmbH Darmstadt, Germany

  2. Motivation & Basic Ideas …and homework • Request: • Replace TUM MUSIC (SOFIA) • Employ fast current amplifiers • Increase accuracy in timing/position determination • Discriminate/avoid projectile charge states • Investigate future FAIR needs and exploit synergies (SFRS) • Challenges: • Improve mechanical & electrical stability & gas-purity • Reduce noise • Improve housing • Push mechanical accuracy in flatness FG/A to O(10µm) • Be very, very fast (in all respect, physically & work-wise) The SFRS/SOFIA MUSIC Design & Layout

  3. General overview • Compact & ‘light-weight’ design, optimized dimensions to fit into the SOFIA & FRS outer: 200 x 240 x 670 mm3 . inner: 120 x 120 x 606 mm3 • ‘en bloque’, EM- & gas-tight • Low- & high-pressure operation • Bubble glasses and markers at all faces for ease of adjustment (done internally & externally) The SFRS/SOFIA MUSIC Design & Layout

  4. Housing • CAD design • Machined (in 2 weeks!!!) with the support of CEA/DAM • after glass-bubble blasting • Protective & conductive coating in progress The SFRS/SOFIA MUSIC Design & Layout

  5. Blind Flange • KF-exhausts for evacuation purpose to ease gas change • Markers to ease levelling & in-beam adjustment The SFRS/SOFIA MUSIC Design & Layout

  6. Panel • Minimized stray capacities (routing- & cable- lengths) • Supports low-& high- pressure operation • Routes all supplies (electrical & fluids) • Carries all Pre-Amps • Screening hood considered The SFRS/SOFIA MUSIC Design & Layout

  7. ‘Functional unit’ The ‘heart’ of the MUSIC • Stiff/rigid design for mechanical precision & shape stability • Optimized electrical contacts for field stability The SFRS/SOFIA MUSIC Design & Layout

  8. Field cage(s) …keep homogeneous fields • 3 identical sections in beam 80(68)x80x190mm3 300-350 V/cm electrical field strength • Stiff walls / flex window design for mechanical stability and best accuracy • 1M strip-strip resistivity (net.) high cross-current max. feed capacity 1mA (?) • Interleaved by stripper foils (not shown here) The SFRS/SOFIA MUSIC Design & Layout

  9. Stripper foil(s) …get rid of contaminants • Get rid of charge states build up within the MUSIC gas-volume • 2 foils (niobium/indium) placed in-between FC-sections • Electrically on Ground potential The SFRS/SOFIA MUSIC Design & Layout

  10. Cathode Plane … keep everything together 190 80 • One thick piece for good flatness & mechanical stability The SFRS/SOFIA MUSIC Design & Layout

  11. Anode Plane … Readout in 2D 80 #2 #3 #1 150 190 • 3 identical sections (#1-3) interleaved by stripper foils • Signal electrodes: 3 pairs/section, 1:9 trapezoidal-shaped, 50mm pitch in beam direction • Screening electrodes: 2 per section at entrance/exit, 20mm width • Base material: 100µm thick, minimized capacity & superior flatness (10µm) The SFRS/SOFIA MUSIC Design & Layout

  12. Assembly … compact • As space-saving as possible • HV-security • Adjustment • Small passive gas volume • Compromises to • Energy & positional resolutions The SFRS/SOFIA MUSIC Design & Layout

  13. Material Budget (‘as designed’, in beam direction) The SFRS/SOFIA MUSIC Design & Layout

  14. HV scheme The SFRS/SOFIA MUSIC Design & Layout

  15. Time Line & Status • 9.3.14 is a most challenging fix-point • Discussions on the HV-scheme esp. the FC resistor-network are ongoing • All material ordered or close to be ordered, external jobs pending and should arrive just-in-time • High precision parts to be done at RBDL • Local machine time ‘reserved’ but in strong competition with other jobs • Assembly work should start 17.02. and last until 03.03. with the help of several students • Lab-testing…? • And for the Twin…? Let’s see…and keep fingers crossed! The SFRS/SOFIA MUSIC Design & Layout

  16. Backup slides

  17. Outline • Recall Requirements • Overall Status Update • Achievements • Problem zones • Housing • Gas • Strip-Line Field-Cage SOFIA TwinMUSIC Status

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