Present Read Out Chain for the PANDA Barrel DIRC

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The group is developing readout electronics for initial use with the prototype test-stand at Fermilab. This work will contribute towards the design and.

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Presentation transcript:

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

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

DAQT & FEE Rauischolzhausen Burle-MCP-PMT 64 anodes 25um channels work in high magnetic field (signal reduced to 30% @ 1Tesla, 10 mm better) Setup MCP-PMT Signal ≈ 5mV 14-April-2010 DAQT & FEE Rauischolzhausen

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

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

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

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

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

Photon detection with MCP-PMT Burle 85011 signal 6mV ampl. 60mV Nino: 10-110mV 14-April-2010 DAQT & FEE Rauischolzhausen

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

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

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

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

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

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

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

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

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

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

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