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Present Read Out Chain for the PANDA Barrel DIRC

Published byMartha Shaw Modified over 6 years ago

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Presentation on theme: "Present Read Out Chain for the PANDA Barrel DIRC"— Presentation transcript:

1 Present Read Out Chain for the PANDA Barrel DIRC
Carsten Schwarz, Setup Experiments Experiences 14-April-2010 DAQT & FEE Rauischolzhausen

2 DAQT & FEE Rauischolzhausen
Setup beam radiator expansion box photon detectors 14-April-2010 DAQT & FEE Rauischolzhausen

3 DAQT & FEE Rauischolzhausen
Burle-MCP-PMT 64 anodes 25um channels work in high magnetic field (signal reduced to 1Tesla, 10 mm better) Setup MCP-PMT Signal ≈ 5mV 14-April-2010 DAQT & FEE Rauischolzhausen

4 DAQT & FEE Rauischolzhausen
Setup gain ≈ 10 14-April-2010 DAQT & FEE Rauischolzhausen

5 DAQT & FEE Rauischolzhausen
Setup HADES readout electronics with NINO add on board The TRB gives a power supply and a slow control 128 Q2W channels TOF AddOn TOF Connected together: back to back Q2W Marek Palka IEEE Dresden we used 2 double boards a 128 ch. = 256 ch. 14-April-2010 DAQT & FEE Rauischolzhausen

6 DAQT & FEE Rauischolzhausen
Setup detector + radiator beam trigger TRB TRB network 14-April-2010 DAQT & FEE Rauischolzhausen

7 DAQT & FEE Rauischolzhausen
Experiment s=600 ps Rings are observed -move with beam angle in right direction time resolution determined by scintillator trigger 14-April-2010 DAQT & FEE Rauischolzhausen

8 DAQT & FEE Rauischolzhausen
Experiences Photon detection with MCP-PMT Signal height Preamplifiers Oscillations NINO Discriminator Effective threshold Working fraction / Housing Vibration hardness / Board TRB TOT Rate 14-April-2010 DAQT & FEE Rauischolzhausen

9 Photon detection with MCP-PMT
Burle 85011 signal mV ampl mV Nino: mV 14-April-2010 DAQT & FEE Rauischolzhausen

10 Preamplifier - Oscillations
Preamps oscillate dependig on how far you open the metal box Standing wave within the box -> input and output coupling PA MCP shield output cables (Aluminum foils not connected to mass) 14-April-2010 DAQT & FEE Rauischolzhausen

11 DAQT & FEE Rauischolzhausen
NINO-Discriminator Threshold A discriminator needs a certain charge over threshold to switch 50 mV adjusted: ??? T.J. Paulus EG&G Ortec, IEEE NS32 (1985) 1242 charge over threshold effect raise not understood 14-April-2010 DAQT & FEE Rauischolzhausen

12 DAQT & FEE Rauischolzhausen
NINO Discriminator measured specs. Threshold depends on rise time of signal 14-April-2010 DAQT & FEE Rauischolzhausen

13 NINO-Discriminator Housing
working fraction demonstration board Serious design needs vias underneath the chip to - ground plane - power plane HADES NINO add ons: --> 3D problem to contact all pads reliably --> 10% not working 7 mm 2.5 V Small housing of NINO causes problems for HADES NINO add-ons Gnd. 14-April-2010 DAQT & FEE Rauischolzhausen

14 NINO Discriminator Board
MMCX = micro miniature coaxial 2.4 mm MMCX plugs are good for rare usage MMCX plugs need some force to connect/disconnect --> mechanical bending of boards (TRB + add on) at end of beam time a block of 32 channels were missing (TRB problem) 14-April-2010 DAQT & FEE Rauischolzhausen

15 TRB: Time over threshold
TOT (channels) pulser test before beam time TOT in beam time 14-April-2010 DAQT & FEE Rauischolzhausen

16 TRB: Time over threshold
TOT (channels) TOT (channels) threshold -44mV threshold -12mV TOT not understood 14-April-2010 DAQT & FEE Rauischolzhausen

17 DAQT & FEE Rauischolzhausen
TRB: Rate due to a wrong capacitor on the NINO add on board for the reference time --> limitation to 30 kHz in beam time --> upper limit of TRB: 100kHz 14-April-2010 DAQT & FEE Rauischolzhausen

18 DAQT & FEE Rauischolzhausen
20 MHz interaction rate barrel multiplicity 2 20 photons per ring ~ 5000 channels (inside region) Rate: 160kHz (inside region) DPM background generator TRB board: 100kHz --> 100/160*20MHZ = 12.5MHz limit due to board 14-April-2010 DAQT & FEE Rauischolzhausen

19 DAQT & FEE Rauischolzhausen
2.5m 125cm * 1.5 / 20cm/ns = 9 ns 375cm * 1.5 / 20cm/ns = 28 ns Delta time = 19ns * 1.5 (geometry) = 28.5 ns ==> 35MHz physical limit due to bar length 14-April-2010 DAQT & FEE Rauischolzhausen

20 DAQT & FEE Rauischolzhausen
Summary Read out chain from HADES works fine for PANDA DIRC tests There is space for improvements rate capability mechanical stability preamplifier shielding 14-April-2010 DAQT & FEE Rauischolzhausen

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