Short Status Summary on the PANDA (-Prototype) GEM-TPC

B. Voss 2 GEM-TPC Prototype (FOPI/CB-ELSA) Collaboration September 8th 2009 GEM-TPC Meeting Agenda Von: Gesendet: Montag, 7. September :32 An: Paola Gianotti Cc: GEM-TPC-UserList Betreff: [Gem-tpc] Central tracker sub-group meeting Dear Paola, sorry for my late reply. I am rather busy with COMPASS at the moment... There will be three presentations in the TPC part of the CT meeting, each of them about 30': 1. Status of GEM-TPC prototype (B. Voss) 2. Test of TPC at ELSA with sparse readout (M. Vandenbroucke) 3. First results on tracking from Bonn (A. Winnebeck) To start after the coffee break is fine. Since I have duties at CERN at present, I am not able to come to Juelich next week. Would you mind to chair the TPC meeting as well? I also suggested to Ulrich that there should be a common report on the CT subgroup meeting in the plenary session on Friday. If you would be willing to do this, I would be very grateful. Of course we will provide you with the slides. Best regards, Bernhard

B. Voss 3 GEM-TPC Prototype (FOPI/CB-ELSA) Collaboration September 8th 2009 Status Overview Outline Detector components Overview Field Cage Read-Out Flange Pad Plane Front-End-Electronic Cooling system FOPI Integration Work nearly done… CB-ELSA Integration Problems & solutions Final PANDA GEM-TPC Ideas for integration Summary

B. Voss 4 GEM-TPC Prototype (FOPI/CB-ELSA) Collaboration September 8th 2009 Brief Status Overview General: some tasks delayed by at least 8 weeks Material research Work ongoing, some hints for aging problems under investigation Detector test assembly Work ongoing for single parts & Cosmics test Flanges Production ongoing Some failures in shape stability of PBT-GF30 parts, several material options checked in parallel GEMs Assembly, tests & design iteration ongoing So far no show stoppers Supplies Tests in Bonn completed, equipment brought back and installed at GSI

B. Voss 5 GEM-TPC Prototype (FOPI/CB-ELSA) Collaboration September 8th 2009 Staggered strip line on Kapton® backside shifted by ½ (not visible) Field Cage ‘Extended’ Option Rohazell ® with Kapton ® /Al shield Kapton ® reinforcement Outer & Inner FieldCage 1000 Strip CE-ELSA needs 650  725 mm Implications of lengthening: Size of Strip Foilsstill feasible anyhow to be merged HV Supplyat its limit 400 V/cm Drift time  +10% acceptable HV stability needs to be checked) Wall thicknesses may by a ‘problem’ Sandwich structure: Rohazell ® core 3..5mm  ??? Kapton ® insulation layers 250µm  ??? Status: Strip-line ‘fall-back’ solution attacked Tools & infrastructure already foreseen & in production Foil production: 3 companies identified, order pending Part mounting: 3 companies in the line to start…

B. Voss 6 GEM-TPC Prototype (FOPI/CB-ELSA) Collaboration September 8th 2009 Basics: Two-sided vacuum Integrated heating (re-usable, <210°C) Status: Prepared for ‘Extended FC’ option 100 µm precision required Production & set-up ongoing Field cage Tooling design Porous Aluminium Formers Linear Heater System Supply & steering unit Linear Heater System

B. Voss 7 GEM-TPC Prototype (FOPI/CB-ELSA) Collaboration September 8th 2009 Read-Out Electronic FlangePad Plane Finally: former problems with geometrical inaccuracy solved Fully functional samples delivered Shape conformity as designed Quality of surfaces OK for GSI-sample Flanges ready Accessories in production Electrical & mechanical assembly ongoing

B. Voss 8 GEM-TPC Prototype (FOPI/CB-ELSA) Collaboration September 8th 2009 Front-End ElectronicXYTER based ‘Hot spots’ on the FEB / chips identified at the Token ring (70°C surface temperature) redesign attacked Engineering run for ASICS launched (1000 n-XYTER chips, 100k€) Second badge of PCB boards still awaiting part mounting & commissioning FEB+DAQ Revision of the 1,2,..4-chip boards + test environment ready to use Work on GEM-TPC boards (2 chips) started

B. Voss 9 GEM-TPC Prototype (FOPI/CB-ELSA) Collaboration September 8th 2009 cooling structure without FEBs Cooling systemGeometry & Design Total heat loss ~320 Watt  Active cooling of front-end-electronic Energy transport (passive) by heat conduction to active cooling with cooling fluid in structure Chips  FEB Backing  Alu Ring  Coulant Cool both ends of FEBs Aluminium structures as mounting of FEB Plexiglas structures with helix for cooling liquid Overpressure system ~ 5 bar pressure available ~ 0,5 bar loss for »cooling pot«  4,5 bar loss for supply & drain line (60m) Size limited by beam pipe & experiment cooling structure with FEBs ‚Media Bridge‘

B. Voss 10 GEM-TPC Prototype (FOPI/CB-ELSA) Collaboration September 8th 2009 Cooling systemGeometry & Design Challenges: Overpressure system (max. 5 bar) Shape stability & tightness Possible improvements: ‘Key and slot’ geometry Integrate into the pots (wire-cut) (  no sealing needed at this place) Various designs of media bridge under investigation Cooling channels Media Bridge (half cut)

B. Voss 11 GEM-TPC Prototype (FOPI/CB-ELSA) Collaboration September 8th 2009 Cooling system Assembly Problems: Helix channels not tight Sealing of pots not tight Media bridge can't take pressure Low tolerances  mounting difficult Solutions: Added sealing between helix channels Sealing of cooling pots with flexible adhesive joint (glue) ‘BetaPrime’ based bonding Works fine (is tight)

B. Voss 12 GEM-TPC Prototype (FOPI/CB-ELSA) Collaboration September 8th 2009 Power & cabling All (LV/HV) modules & break-out boxes operational Route HV cables in FOPI-Cave (B) in preparation Installation of MPOD crate etc. pending

B. Voss 13 GEM-TPC Prototype (FOPI/CB-ELSA) Collaboration September 8th 2009 Air cooled Huber Unichiller operational Tubing Min. 6 mm inner diameter to/from lines required 28 meter length (single path) Polyethylene or multilayer (COES) 16mm outer diameter recommended Orders for tubing & interface parts placed Placement of cooling unit in-/outside FOPI cave to be decided Cooling Plant

B. Voss 14 GEM-TPC Prototype (FOPI/CB-ELSA) Collaboration September 8th 2009 Gas System

B. Voss 15 GEM-TPC Prototype (FOPI/CB-ELSA) Collaboration September 8th 2009 Problem Enlarge it to 725 mm Implications on HV-System, Manufacturing, Mounting, … Field cage with actual length 650 mm too short by ≈86mm

B. Voss 16 GEM-TPC Prototype (FOPI/CB-ELSA) Collaboration September 8th 2009 System Light-weight & stiff sandwich structure CRP+Rohazell ®

B. Voss 17 GEM-TPC Prototype (FOPI/CB-ELSA) Collaboration September 8th 2009 Distance cross-section.. cross-section ≈765mm Issues Place available for support structure

B. Voss 18 GEM-TPC Prototype (FOPI/CB-ELSA) Collaboration September 8th 2009 Issues Required for cable traces: 1..2 additional break-outs each Ø 94mm  6940 mm² Break outs (air cooling)

B. Voss 19 GEM-TPC Prototype (FOPI/CB-ELSA) Collaboration September 8th 2009 Start detector Interference

B. Voss 20 GEM-TPC Prototype (FOPI/CB-ELSA) Collaboration September 8th 2009 detector Target How is this to go on? It has to stick out (tough space restrictions)

B. Voss 21 GEM-TPC Prototype (FOPI/CB-ELSA) Collaboration September 8th 2009 Challenges Very restricted space to reach the GEM-TPC The ‘Unknown’: Nearby systems detailed design, e.g.: BW-EMC Cabling requirements TOF design Length Beam-pipe Support structures Mounting conditions General PANDA infrastructure conditions Characteristic of FEE GEM-TPC BW EMC Possible solution: Design the conduit system as integral part of the detector How to connect ?

B. Voss 22 GEM-TPC Prototype (FOPI/CB-ELSA) Collaboration September 8th 2009 Conduit System Use the symmetries Shape conformal & stiff design ‘Smooth’ sections & junctions Integrally molded patch panels (one per ½-detector, outside magnet) Thin-walled cable guide (CRP/GRP) Make multiple use of functionalities Fully shielded electrical tubing Additional support structure interfacing to ‘existing’ rails Preserve possibility of sequential mounting of BW-EMC & GEM-TPC Requirements: Irregular & non-standard sub-structures, tubes & cabling components Note the GEM-TPCs ‘security’ layer and the ‘hull’ breaches…            ‚Security‘ shell GEM-TPC EMC Penetration

B. Voss 23 GEM-TPC Prototype (FOPI/CB-ELSA) Collaboration September 8th 2009 Summary GEM-TPC Prototype: Problems in building some parts Ansatz & solutions addressed Verification pending CB-ELSA Detector too short  ‘Extended FC’ option required Consequences and implications under investigation Design on the support etc. started FOPI ‘Extended FC’ option: geometrically ‘no problem’ Tubing: finished for gas, pending for liquid coolant & HV Material purchase ongoing PANDA (final detector) Design / concept for the cabling addressed, needs discussion

GEM-TPC GSI crew members & tasks Rahul AroraTesting setup Jörg HehnerAging tests Markus HenskeMaterial tests, sensors, infrastructure, purchase Volker KleipaFront-End Electronics (XYTER) Jochen KunkelMechanics, drawings, simulations, assembly, tooling Christian SchmidtFront-End Electronics (XYTER) Sandra SchwabPart production, tooling, FOPI environment Daniel SoykSimulations & FOPI Integration Ufuk TueyGeneral mechanics, drawings Bernd Voss‚All & nothing‘, ideas & concepts, project & logistics Jan VossGeneral mechanics, material tests Joachim WeinertPart production, tooling … other members of the GEM-TPC Collaboration

Backup slides

B. Voss 26 GEM-TPC Prototype (FOPI/CB-ELSA) Collaboration September 8th 2009 Basics: Two-sided vacuum Integrated heating (re-usable, <210°C) Status: 100 µm precision required Design finished, Production started Field cage Tooling design Porous Aluminium Formers Linear Heater System Vacuum channels Air flow

B. Voss 27 GEM-TPC Prototype (FOPI/CB-ELSA) Collaboration September 8th 2009 Electronic Processing Read-Out Flange & Cooling 42 slots for Front-End Boards Integrated passive liquid cooling, thermal screening, LV distribution Sensors: ( flow, p, T) i,o Overpressure valves Sealing of inner Field Cage Supply & distribution at outer periphery Assembly & test pending LV- connectors (70A) Cooling pots Stabilizers & Media bridge

B. Voss 28 GEM-TPC Prototype (FOPI/CB-ELSA) Collaboration September 8th 2009 Detector

B. Voss 29 GEM-TPC Prototype (FOPI/CB-ELSA) Collaboration September 8th 2009 OutlookTime Line Planned completion (2009) Supplies & Support Media Flange08-09 Interaction Field Cage09-10 Amplification GEM Stack08-09 Signal mapping Pad Plane08-09 Electronic processing Front End Electronics08 Read Out Flange07-08 Operation Cooling Structure07-08 Sensors & Slow Control06prepared Supplies & Infrastructure07-08 Integration External support structurefinished