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Central tracker for 12GeV upgrade in HallB

P. Konczykowski CEA Saclay 06/28/08. Central tracker for 12GeV upgrade in HallB. Micromégas : a new detector for CLAS12 Detector’s principle GARFIELD simulation Spatial resolution measurement Long Micromégas prototype tests Integration to the CLAS magnet

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Central tracker for 12GeV upgrade in HallB

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  1. P. Konczykowski CEA Saclay 06/28/08 Central tracker for 12GeV upgrade in HallB Micromégas : a new detector for CLAS12 Detector’s principle GARFIELD simulation Spatial resolution measurement Long Micromégas prototype tests Integration to the CLAS magnet Saclay team: S. Aune, J. Ball, M. Combet, M. El Yakoubi, P. Konczykowski, C. Lacombe-Hamdoun, S. Procureur, F. Sabatié

  2. CLAS12- Spectrometer Forward Detector Central Detector (Silicon and maybe Micromégas)

  3. Micromegas principle Fast ions collection ~100 mm thin gap

  4. Comparison Micromégas advantages: : less material on the particle path, flexibility, cheap : feasibility with a 5T field, worst intrinsic resolution (for  @ 0.6 GeV/c ,  = 90°) Central tracker  A mixed solution combines the SI and MM advantages!  The « only SI » solution is never optimal…

  5. 1500 V 2000 V 2500 V 3000 V 1000 V Simulations in B-field  GARFIELD code (CERN) Large Lorentz angle (~ 75o) Regular electric field configuration : • higher drift field • reduce conversion gap 1 mm!

  6. Experimental setup • Magnet refurbishing: Fall 2007 • Tests started:February 2008 • Magnetic field: 0 to 1.5 T • Laser: UV 355nm + neutral filters • <50µJ/pulse, 2ns pulse, very good • beam size and divergence • Detector: MM prototype V3 • Bulk MM detector equipped with Gassiplex • Board (96 channels) • Active area 30x30 mm2, pitch 300 μm • 2.25mm Drift-Mesh, 128µm Mesh-Strips • Gas: 5% iC4H10 + 95% Ar

  7. Experimental principle UV Laser Filter Focusing lens Drift electrode Al-mylar ~800V e- Conversion 1.88mm ~1kV/cm Ar-iC4H10 Micromesh ~400V Amplification 128μm ~40kV/cm Strips

  8. With a magnetic field UV Laser Filter Focusing lens Drift electrode ~800V e- Conversion 1.88mm B ~1kV/cm ΘLorentz Ar-iC4H10 Micromesh ~400V Amplification 128μm ~40kV/cm 96 Strips This distance is related to qlorentz

  9. Data acquisition & analysis • <ADCi/ΣjADC> • Lorentz angle mesured from the deviation of the B=0T peak • Drift distance: 1.88mm • The signal spreads out with the Lorentz deviation → increase the resolution B = 0T B = 1.5T Labview DAQ

  10. Lorentz angle behaviour with the magnetic field

  11. Lorentz angle behaviour with the drift HV this difference may be related to the uncertainty on the drift gap

  12. Spatial resolution • Sigma of the average position calculated event by event • σ²exp=(σ2laser+σ²det)/N • When the magnetic field increases → the resolution increases • Test the detector homogeneity B = 0T B = 1.5T

  13. Micromégas prototype for the central tracker

  14. Micromegas Bulk Demonstrator One type of Bulk: Active area; 115 mm for 288 strips, 500 mm long Material: 100 µm PCB, 5 µm Cu, 18µm mesh, 20µm Mylar Two type of structure, X and Y, for Bulk integration: Cylindrical for Y: f ext: 220 mm Tile for X: f int 180 mm One support for up to 3 X tiles and 3 Y cylinders: Channels: 1728 read by AFTER ASIC (T2K) Active area: 0.34 m² Dead zone between detectors not optimized on the prototype !!! Y cylinder X tile Support structure

  15. Cylindrical Prototype Cylindrical prototype Magnet interface (3 Teflon pads) X tile Y cylinder Length: 600 mm Diameter: 180 / 220 mm Y joint Y connector Y HT cable Interface attachment to handcart

  16. Received friday May 23rd

  17. Long Prototype : fabrication (Jan.-March. 2008) • Bulk made at CERN • 4*72 strips • 4 prototypes have been fabricated and flat-tested, cylindrical test on the way Detailed views During Bulk realization

  18. Long MM experimental setup Flex PCB cable tests : • Strip cables (40cm, 80cm et 80cm U-shaped) • Wire cables (40 cm, 80cm et 80 cm U-shaped) • 55Fe source tests Detector’selectronic (FEC +FEM) Flex PCB cable, 80 cm U-shaped PLV4: Long Prototype V4 Acquisition made with T2K Labview DAQ Software

  19. AFTER signal on the strips Channel 71 ADC 55Fe shaped signal Signal Signal - noise Noise 512 time samples Time (x 50 ns)

  20. Integration to the CLAS magnet

  21. Prototype « cart » The prototype will be fixed on a mobile cart (telescopic slide rail) itself fixed on the magnet. The handcart allows full test in and out without dismounting the detector. Will be used for future test @ 5T with DVCS magnet. 400 mm In Out

  22. Prototype inside CLAS+DVCS magnet Electronics box Telescopic slide rail DVCS magnet detector HT filter Gas distribution View with interface

  23. 2000-channel tests #1 and 2 1. During fall 2008, 5T test inside DVCS solenoid: 2. During change-out between e1-dvcs and eg1-dvcs(?), beam test: • Goals: • Dry test for test beam end 2008: full prototype on handcart • Lorentz angle @ 5T: one X tile with UV laser • Cosmic test @ 5T: Three X tiles. • Goals: • Beam test: full cylindrical prototype on cart • Beam test: Forward prototype if possible

  24. Conclusion & Perspectives now 08 09 10 11 12 13 2014 2007 A B C D E Project Feasability Definition Development Production Experiment Preliminary Design Review Production Readiness Review Milestones Decision (Si and/or MM) Final Design Review • B-field tests at 1.5T almost done: optimistic results • 6 MM detectors to be built at CERN this summer and integrated in the mechanical structure • The whole structure with mounted detectors will be shipped to JLab end of August/beginning of September Prototyping B 2k-ch. v1 Forward now 08 09 1.5T test 5T test Beam test

  25. ANNEXES

  26. Why we need tests in B-field Space resolution But we need to check: 1. how realistic GARFIELD simulation is 2. can we reach a satisfactory voltage setup with a thin cylindrical Micromegas detector.

  27. Electronics schematic DUAL TIMER N93B 50ns MESH (IN) AMPLIFIER ORTEC 454 QUAD DISCRIM. LECROY 821 DUAL TIMER N93B 50ns OUT START IN OUT START OUT E.MARKER VETO BUSY TRIGGER SEQUENCER V551 VME CONV CLEAR CLR CLK DREADY START IN2 IN1 GATE GEN. LEVEL ADAPTER 8010 GASSIPLEX OUT1 CLR C-RAM V550 OUT OUT IN CLK OUT2 STRIPS DATA (OUT) T/H VME STRIPS (IN)

  28. Data acquisition (Labview)

  29. Data analysis : GUI ROOT • Reads the Labview files • Substracts the pedestals • Draws the average ADC per channel, the position weighted by the ADC value, its evolution during the run, the ADC spectrum for one channel and for all the channels, etc • Single Event Viewer

  30. Long Prototype study with 55Fe Homogeneity of the detector Energy resolution

  31. Noise study: preliminary results Pedestal for channel 71

  32. Summary (preliminary) Probably not real 0- Electro. Only 1- FEC + Det 2- Flex PCB cable 40 with Strips 3- Flex PCB cable 40 with wires 4- Flex PCB cable 80U with Strips 5- Flex PCB cable 80U with Wires 6- Flex PCB cable 40 x 2 7- Flex PCB cable 2 m Without noise optimization: noise with 80cm flex cable ~6 for MIP signal expected ~50. => Flex PCB cables up to 80cm are definitely useable !

  33. Future plans with B-field tests (June-July + fall ’08) • -Improved precision tests thanks to a larger drift gap • Direct measurement of gap with the laser setup • Precise variation of the laser intensity with neutral filter wheel • Tests planned in the fall ’08 with e1-dvcs magnet at 5T and large-area detectors

  34. UV Plots: f 200 à 400 microns Mini: 4 mm 50 à 100 mm 2 à 4 mm Concept du bulk 1) PCB (pistes, pixels,…) 2) Photoresist 1 (50 à 150 microns ) 3) Grille(inox tissé de 19 microns, 500 LPI) 4) Photoresist 2 (50 à 100 microns) 5) Insolation UV 6) Développement 7) Cuisson (UV et four) Mask Photoresist 2 Mesh Photoresist 1 PCB

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