1 / 25

The Arch

The Arch. D. Bertrand, J. De Bruyne , P. De Harenne , L. Etienne, S. Hannaert , G. Van Beek. The Arch. Determination of the cosmic rays zenith angle distribution by timing measurements Demonstration of the principle of a TOF detector

nicki
Download Presentation

The Arch

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. The Arch D. Bertrand, J. De Bruyne, P. De Harenne, L. Etienne, S. Hannaert, G. Van Beek

  2. The Arch • Determination of the cosmic rays zenith angle distribution by timing measurements • Demonstration of the principle of a TOF detector • Practical for 3rd (or 4th) yearstudents • Future: recording of Cherenkov rings with a multi-anode PM

  3. Detector elements • Based on scintillatorstrips of the targettracker module of the OPERA experiment; • 7 m bars cutinto 13 cm rods (TiO2 on end faces); • Groovesenlarged in order to put 2 wlsfibers; • Gluedhorizontally.

  4. Detector elements • 8 rows of 40 rods Ribbonlength 517 cm, width 21 cm; • 16 wlsfibers (604 cm each); • Read by Hamamatsu H6780 PM’s (gain: 106; rise time: 780 ps, transit time spead 230 ps; DC-DC converter)  PM1 & PM2

  5. Detector elements • Central module: 21× 21×2 cm3 plastic scintillatorread by 2 face to face PM’s (Hamamatsu R7400)gain ~106 @ 850 Vrise time: 780 pstransit time spread: 230 ps PM3 & PM4

  6. Calibration • Time/position: 16 blueLED’s (8 on eachside of the ribbon) • Efficiency: 21× 21×2 cm3 plastic scintillatorread by a Photonis XP3102 PMgain : 5×105 @ 900 Vrise time: 2 nstransit time: 23.8 ns •  PM5 moveable in 8 positions along the Archcorresponding to the LED0/LED7 positions

  7. Specificelectronic modules • TDC CAEN V1290A: • 320 MHz clock + DLL with 32 delayelements 98 ps • R-C delaylines  veryhighresolution (25 ps) but needs calibration following an internal design • Hits stored in individual buffers for eachchannel • Buffers emptied in a FIFO (32kwds of 32bits) • Continuous or trigger inducedreading • Lowthresholddiscriminator • CAEN N417: • 8 channelswithseparateadjustablethreshold and width • Width range: 15 – 800 ns • Threshold range : 1.5 – 250 mV • 2 channels/PM (double discrimination)

  8. TDC reading in trigger mode Memory/FIFO clock cycle : 25 ns Window offset Match windowwidth Reject margin Extra search margin Match windowwidth < | window offset | ≤ 4095 clock cycles = 102375 ns Match windowwidth + window offset ≤ 40 clock cycles = 1000 ns

  9. The surveyparameters

  10. Position calibration (LED’s) 58 ns (PM) +51 ns (LED timing)+45 ns (twisted pair) + wlsfiberdelay LED driver ~20 Hz Timing unit Disc TDC (trigger) TDC (chan 4) ~200 ns (timing unit) LV0 (15 V) PM1 Disc (1.5 mV) TDC (chan 0) PM1 LV1 (15 V) PM2 Disc (~3 mV) LV2 (6.5 V) PM2 TDC (chan 1) LED Disc (1.5 mV) Disc (~3mV) Width: 100 ns

  11. Patch pannels From the Arch To the Arch On the Arch (side 1)

  12. Position calibration (LED’s) 0 50397400 4 50218275 1 50428700 0 46431100 4 46253000 1 46463050 0 43984525 4 43806025 1 44016500 0 41657325 4 41478250 1 41689050 0 37752050 4 37572775 1 37784800 0 35280825 4 35102500 1 35314550 0 32486850 4 32308750 1 32521350 0 29436825 4 29258600 1 29471300 ● ● ●

  13. LED voltage / time distribution width From 0.5 V to 6.5 V

  14. LED voltage / Time delay From 0.5 V to 6.5 V

  15. Gaussian fit (typicalwitdth: 1.2 ns)

  16. Linearregression v : 16.14±0.06 cm/ns LED’s 0-7 LED’s 1-7 v : 16.36±0.06cm/ns LED’s 1-15 LED’s 8-15 v : 16.30±0.04 cm/ns v : 16.32±0.03 cm/ns  6.13 ns/m

  17. Efficiency 0.7 0.6 PM1/PM2 LV: 15 V Disc: 3 mV PM5 HV: 900V Disc: 30 mV NIM scaler

  18. Data acquisition PM1 Disc (1.5 mV) TDC (chan 0) LV0 (15 V) PM1 57 ns (PM1/2) –45 ns (PM3/4)+20 ns (wlsfiber: 3 m × 6.14 ns/m) LV1 (15 V) Disc (~3 mV) PM2 PM2 TDC (chan 1) HV0 (850 V) Disc (1.5 mV) PM3 TDC (trigger) HV1 (850 V) PM4 Disc (~3mV) TDC (chan 2) PM3 Disc (1.5 mV) ~32 ns Disc (20 mV) TDC (chan 3) PM4 Disc (1.5 mV) ~32 ns Disc (20mV)

  19. LabVIEW acquisition system 1 28264275 2 28245700 0 28275825 3 28245850 0 50571950 2 50546650 1 50578500 3 50545575 0 3554725 2 3524625 1 3550325 3 3525725 0 10165850 2 10144200 1 10173625 3 10144350 1 20795700 2 20772750 0 20809150 3 20772475 0 46348350 2 46330125 1 46372050 3 46331250 ● ● ● 100 µ m-2s-1 x 0.044 m2 x 0.68 (efficiency) / 2p = 0.48 Hz

  20. Angular distribution

  21. TOF 6.7 ns 12 ns

  22. TOF  Momentum MeV

  23. Momentumangulardependence Right Left

  24. Momentumangulardependence < 20° 20°-40° > 40°

More Related