html5-img
1 / 16

Forward Detectors DCS

Forward Detectors DCS. Forward Detectors (FWD): T0 - quartz Cherenkov V0 - plastic scintillator FMD - Si strips. Disclaimer: Detector layout and technology details not finalised DCS has not been given much thought.

joanne
Download Presentation

Forward Detectors DCS

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Forward Detectors DCS Forward Detectors (FWD): T0 - quartz Cherenkov V0 - plastic scintillator FMD - Si strips Disclaimer: Detector layout and technology details not finalised DCS has not been given much thought ”Small, simple detectors” without very particular requirements - should be able to take many solutions from others Børge Svane Nielsen, NBI

  2. Forward detectors in ALICE Si-1 V0-R Si-2 T0-R Si-3 Børge Svane Nielsen, NBI

  3. T0 detector • Precise event timing (=50ps) • Start detector for ALICE-TOF • Main LVL0 event trigger • Pre-trigger for TRD • Rough on-line vertex determination <1.5 cm • Beam-gas suppression • Output Signals: • T0 = (tr+tl)/2+td • T0v = tr-tl • T0-L, T0-R • Time and energies • 3 levels of sum energy (low, medium, high) Børge Svane Nielsen, NBI

  4. T0 controls • High voltage: • PM tubes: 1500-2000 V • 1 supply per counter  24 channels total • Electronics: • 48 discriminator channels • 24 ADC + 27 TDC channels • parameter loading & monitoring ? • Calibration • laser: parameters & controls? • Trigger circuitry: • parameters & monitoring ? Børge Svane Nielsen, NBI

  5. V0 detector • Two segmented scintillator hodoscopes on either side of IP • Minimum bias trigger: p-p and Pb-Pb • Main on-line LVL0 centrality trigger: Pb-Pb • Background filter for the dimuon spectrometer • Two arm for beam-gas rejection • Luminosity control • Multiplicity measurement (high occupancy) Absorber V0-R Børge Svane Nielsen, NBI

  6. V0 layout • V0-L and V0-R: 5 rings each • Rings 1-4: 30° sectors (12) • Ring 5: 15° sectors (24) • Plastic scintillator • Wave-length shifting fibers in groove • Clear optical fibers for light transport (25 m) • Photomultiplier Børge Svane Nielsen, NBI

  7. V0 controls • High voltage: • PM tubes: 1500-2000 V • 1 supply per counter  144 channels total • Back-end electronics: • parameters & controls ? • Trigger circuitry: • parameters & monitoring ? Børge Svane Nielsen, NBI

  8. FMD detector Si1 Si3 Si2 Børge Svane Nielsen, NBI

  9. FMD ring layout Full FMD = 3 inner rings + 2 outer rings Inner: Rin=4.2 cm Rout=17.2 cm Outer: Rin=15.4 cm Rout=28.4 cm 128 256 20x2x128=5120 10x2x256=5120 Børge Svane Nielsen, NBI

  10. FMD ring assembly Si FEE Hybrid Support Honeycomb Børge Svane Nielsen, NBI

  11. FMD Si sensor VA-32 pre-amp. chip 256 strips 2  sectors Connector Daisy chain 256 ch => 25 sec DT Børge Svane Nielsen, NBI

  12. Cable function Segments (wafers) # lines Phi sectors Cable type Radial strips Hybrids # cables for inner ring Chips/ Hybrid # cables for outer ring FE Chips FE Channels FE controls 10 Shielded twisted pair 2 2 Si 1 inner 10 20 256 10 16 160 5,120 Analog data out 1 Shielded twisted pair 20 20 Si 1 outer 20 40 128 20 8 160 5,120 FE power 4 Shielded twisted pair 20 (or 10?) 20 Si 2 inner 10 20 256 10 16 160 5,120 Bias voltage 1 Shielded twisted pair ?? 10 20 Si 2 outer 20 40 128 20 8 160 5,120 Si 3 inner 10 20 256 10 16 160 5,120 Total system 70 140 70 720 25,600 FMD channels and cables FMD channel count: FMD cable count: Børge Svane Nielsen, NBI

  13. FMD controls • High voltage: • bias voltages for Si strips: 50-100 V • minimum 1 supply per half ring  10 channels total • maximum 1 supply per segment  70 channels total • Low voltage: • power for front end electronics: 5 V ? • 1 supply per segment  70 channels total • Front end electronics: • design still very uncertain, only preamp type chosen • options: analog or digital read-out • monitor a few temperatures • down-loading of parameters • Back end electronics: ??? Børge Svane Nielsen, NBI

  14. TPC laser DCS Details: http://www.nbi.dk/~borge/tpclaser Børge Svane Nielsen, NBI

  15. TPC laser UV Laser: power supply and cooling supplied by Spectron Lasers. Controlled by RS232 to simple DOS program - reprogramming desirable. Børge Svane Nielsen, NBI

  16. TPC laser controls • High voltage and cooling of laser: • HV and flash pulse circuit • cooling water circulation unit • control interface to RS232 Rack unit supplied by Spectron Lasers company • Movable optics controls: • picomotor drives (a la stepping motors) • 10-20 individual motors • Cameras: • CCD cameras for beam position monitoring • 8-10 cameras Børge Svane Nielsen, NBI

More Related