Minutoli, S

CERN Document Server

Saverio Minutoli INFN Genova 1Saverio MinutoliINFN Genova7 March 2006Talk overview: T1 detector structure CSC lab measures Radiation environment Anode FE system overview Anode vs VFAT measuresT1 Electronic Design Review Cathode FE overview Data and Trigger optical links Slow Control Ring H.V. and L.V. power distributionSaverio Minutoli INFN Genova 2Overview of T1 detector T1 is composed by 2 arms Each arm contain 5 planes, each with 6 CSC trapezoidal chambers Each chamber is realized by 1 anode and 2 cathode planes For mechanical reasons, each arm is divided into two halves : each half is considered independent to the other also from electrical/logical point of view  In total, each halve include 15 chambersSaverio Minutoli INFN Genova 3Handling signals In each chamber there are (maximum numbers): 220 anode wires 192 x 2 = 384 cathode strips In total for the 2 arms there are220 x 30 x 2 = 13200 wires384 x 30 x 2 = 23040 strips Each wire (anode) and strip (cathode) generate a digital information: 1 bit for each wire and 2 bits for each strip, assuming the half strip resolution for the cathode signals. In total, the maximum number of bits managed by the electronic readout system is approximately 60000 (~1000 per chamber). Data taking and triggering are indipendent for each T1 halve: trigger can be combined together at higher hierarchical level. Saverio Minutoli INFN Genova 4Anode/Cathode static measurements Impedance measured with TDR method. Capacitance measured with 4 wires LCR instrument. Anode wires: Z = 330 ÷ 390 Ω cap. 7 – 16.5 pF (others to gnd) Anode wires length 20 – 100 cm Cathode Strips: Z = 120 ÷ 150 Ω cap. 7 – 88 pF (others to gnd) Cathode Strips length 6 – 80 cmSaverio Minutoli INFN Genova 5T1 Radiation Environment T1 CSCs are placed between 7.5m and 9.5m Anode worst position R = 25 cm  107*10-3*102/102 = 10krad/year Cathode position R = 63÷80 cm  107*10-4*102/102 = 1krad/yearAssuming:•107s/year•L=1032cm-2s-1Mika’s dataT12580750 950Saverio Minutoli INFN Genova 6CSC FE Electronics The T1 chambers have been tested on beam, 2002-2003-2004. Due to the compatibility with the CMS-EMU CSC chambers, the same FE electronics have been used. Anode FE based on AFEB 16 – (validated by EMU people up to 65-70 krad; http://www hep.phys.cmu.edu/cms/RAD_HARD/2000/rad_test_p_63_1.html) Cathode FE based on: BUCKEYE - ( tested by EMU people up to 300 krad; no meaningful variation up to 60 krad http://www.physics.ohio-state.edu/~cms/raddaq2/results.html ) LCT-COMP - ( validated by UCLA people up to 50 krad; http://www-collider.physics.ucla.edu/cms/trigger/proto99/comp_radiation_test.html) Concerning the Anodes FE electronic, due to the different environment, power consumption and mechanical constraints, an alternative solution have been evaluated: We are investigating an testing the compatibility of the analog section of the VFAT2 with the anodes CSC wires.Saverio Minutoli INFN Genova 7CSC Anode FE Electronics  VFAT2 VFAT2 was already planned to use for digital buffer, data storage and serializer. Now, for the anode FE, we will try to use also its analog section. Possible problems: Anode capacitance Signal Polarity Shaping time, the CSC signals are not faster VFAT analog, don’t have any baseline restoring and tail cancellation Signal amplitude, a CSC can produce hundred of fC Jitter, our CSC have ~100nsSaverio Minutoli INFN Genova 8Anode FE channel adapter network scheme4M7I41n10k7 - 16.5 pF00ANODE WIRE3k3-3k6 Vdc0=ANODE WIRE MODELH.V.06kV3k3-3k6 Vdc 1M4M74M74M71n1n6kV06kVVFATPREAMP00ANODE WIREANODE WIRE1n10k6kVANODE WIRE1n10k6kVx3CSC ANODES CONNECTIONSAv = 53mV/fCMISSING INOUR TESTSVFATCOMPDIGITAL OSCILLOSCOPEOUTINANODE WIRE0HVDECOUPLERCSC to VFATADAPTATIONNETWORK01n10kI27 - 16.5pF6kV3301pSaverio Minutoli INFN Genova 9VFAT analog on the test benchThe VFAT preamplifier tested isn’t the final version. The DUT, FEDC1 V1.0, is DC coupled, the preamp and the shaper stages are identical to the final version, the comparator stage and amplifier (gain x 3) are missing, as the digital parts and spikes protection networks. The test board in the pictures have been produced by the MIC group with the only intent to measure the noise due to the detector capacitance. The Genoa group has bonded few analog channels (6), coupling the passive network as near as possible to the die, but only once is possible to select in output.Saverio Minutoli INFN Genova 10VFAT analog on the test benchVFAT preamp. test board Gain and BW test benchSaverio Minutoli INFN Genova 11VFAT analog channel on the test benchVFAT-DC preamplifier prototype GAIN-16fC, 236mV14.75mV/fC16fC,-276mV17.25mV/fC-1000-800-600-400-2000200400600-60 -40 -20 0 20 40 60VFAT input (fC)VFAT output (mV)External pulser, no chamber connectedPulse 100µs – 1kHzPulse Gain expected value53/3=17.65mV/fCThe anode signal could be much large, we risk to work in the bent region, where the stage saturate.Saverio Minutoli INFN Genova 12VFAT analog on the test benchVFAT Bandwidth with CSC anode passive network3.7MHz 19MHz0.111010010000.1 1 10 100Vin(f) (MHz)VFAT output (mV)External pulser, no chamber connectedSinus Input signalConstant Vin=~10fCConsidering the CSC peaking time 40-50ns, our working position on the graph is around 4MHzSaverio Minutoli INFN Genova 13VFAT analog on the test benchVFAT outputwidth with10fC InputVFAT outputtail with10fC InputVFAT outputtail with30fC InputVFAT outputsaturation with100fC Input84ns1.4µs800nsSaverio Minutoli INFN Genova 14CSC Anode vs analog VFAT tests CSC test conditions: HV CSC chamber, 3250-3300 Vdc Gas mixture 55% CO2 –45% Ar Can be triggered with Cosmic raysSaverio Minutoli INFN Genova 15CSC Anode vs analog VFAT testsAnode with ZL=10kΩ, tail too long,with ZL=330Ω seems ok.CSC anodeVFAT outputCSC anodeVFAT outputCSC anodeVFAT outputSaverio Minutoli INFN Genova 16Anodes Considerations The VFAT2 analog section, can be adopted for the CSC anode wires, using the adapter passive network shown. Due to the shorter shaping time, we loose some signal, but we can accept it. With big signals we have a long recovery time due to missing tail cancellation circuits. CSC jitter has been solved with the digital programmable (up to 150ns) stretcher already included in the VFAT2 design.Saverio Minutoli INFN Genova 17Anode FE Card block diagramDCUC121nR1210k6kV0CH_1 R133300C131pANODES[256:1]C141nR1410k06kVCH_256R153300C151pR16PT100TRIGGER LOGIC [16:1]ANODES[128:1]TRIGGER[8:1]0INPUTSTRIGGER[16:9]ANODES[256:129]DACo_I_A1DACo_I_A2DACo_V_A2T1DACo_V_A1I2C_DCUDAV_A1DAV_A2POWER_SUPPLY2V5DOUT_A1DOUT_A2CK40(MAX 16)(MAX 8)I2C_VFATVFAT_2MEZZANINEVFAT_1MEZZANINESaverio Minutoli INFN Genova 18Anode FE Card integration The Anode FE Cards are 10 types,one for each kind of CSC chamberOld HV network board(digital part not shown)Sketch of the new Anode FE Card (AFEC). The VFAT mezzanine could be the same used for T2-GEMSaverio Minutoli INFN Genova 19Cathodes FE electronics The cathodes FE electronic components implemented in our design, are the same as used in the CMS-EMU detector. These devices  can be well integrated in our CSC chambers system. Buckeye and LCT-COMP are available from CMS. Due to the LCT-COMP device, the cathodes spatial resolution will be increased of a factor two (half strip resolution) and a unique peak identification is also possible. This is usefull in the events where the charge distribution on the cathodes involve more than 3 strips. The structure foreseen is realized with 6 eurocard boards (bigger chamber) per chamber, managing 64 channels each. Each board allocate a VFAT mezzanine (2 bit/channel).Saverio Minutoli INFN Genova 20CSC Anode and CathodesEvent with 3 cathodes hit underneath an anode.Cosmic triggeringAnode Wire length 90cm• ZL=330Ω (impedance line     matching)Cathode strips length 80cm• ZL=150Ω (impedance line matching)AnodeCathodesCathodesSaverio Minutoli INFN Genova 21Cathode FE Card block diagramTEST PULSE INDCUCH_[1:16]R21PT1000DACo_I_A1T1DACo_V_A1DAV_A1I2C_DCUV25+2V5DOUT_A1CK40(MAX 16)(MAX 8)I2C_VFATVFAT_1MEZZANINEI2CTSOUTTSINV5+5VV5M-5VV10M-10VCK4016161616BUCKEYE16128DESERIALIZER16LCT_COMPCH_[17:32]16BUCKEYE16LCT_COMPCH_[33:48]BUCKEYE16LCT_COMP16CH_[49:64]BUCKEYE16 16LCT_COMPCK40PEAK_TIME3THRESHOLDSaverio Minutoli INFN Genova 22FE sub-system overview6xCFEC = 2x192chsAFEC 220chs50cmCSC Plane_nCSC Plane_n+1DOHM-CCUSLOW CONTROL RINGSaverio Minutoli INFN Genova 23FE Read-Out Card block diagramCSCnCSCn+1Saverio Minutoli INFN Genova 24T1 Data architecture~6kwiresROCT1 ARM161x2x918~6kwiresROCT1 ARM161x2x9 18T1 DATA_TOTFED99T1 DATA_TOTFED9 9COUNTING ROOMCAVERNDAQ4xSLINK~12kstrips~12kstripsCSC(8xVFAT2)x2(GOL)CSC(8xVFAT2)x2(GOL)(Needs 0 supp.)Saverio Minutoli INFN Genova 25T1 Trigger segmentation Only the anodes wires are used to generate trigger informations. T1 chambers will use the basic functions included in VFAT2. VFAT2 provide fast regional hit information to be includedwithin the CMS First Level Trigger (LV1). Anode wires channels are grouped together to form sectors. A hit channel in a given sector will set an LVDS output assignedto that sector to a logic “1". The assigment of channels to sectors is programmable. There are 8 LVDS sector outputs available. T1 trigger set-up use all of them, conseguently, the 128 channels are divided into eight equal regions. Sector 1 (S1) will contain channels 1 to 16, sector 2 (S2) willcontain channels 17 to 32 etc.Saverio Minutoli INFN Genova 26T1 Trigger architecture~6kwiresVFAT2CSCT1 ARM18x2130~6kwiresVFAT2CSCT1 ARM1 8x2 1x2x15 30T1 TRG_TOTFED12 1233T1 TRG_TOTFED1212 3 3MASTERTRG_TOTFED16:1S.L.16 16COUNTING ROOMCAVERNTrigger Bits 2 x 480 = 960(16) (16)x2x15x8 x816:1S.L.(Needs TRG algo.)LV14Saverio Minutoli INFN Genova 27Assuming the highest LV1 rate of 100 KHz.A single FRL can sustain up to 1.6 Gb/s with event size ≤ 2 kB. 8 ROC for each half (half T1 arm): 9 data GOL, but only 7.5 are full Need a zero suppression on DATA_TOTFED 15 trigger GOL FRL data size= 128(chs)*16(VFAT)*7.5/8=1920B < 2kB Boards needed: 2 data TOTFED with 2 mezzanines each 2 trigger TOTFED with 3 mezzanines eachData ratesSaverio Minutoli INFN Genova 28Slow Control Ring architectureFault repair configuration example.OEConversionT1 will use the same CMS control ring components (DOHM-CCUM_TOB_TEC) and configuration.The modules shall be connected to guaranty the system redundancyT1 need a DOHM and a loop of 6 CCUM for each arm.Limitations due to the short ring length:• Max distance between CCUM modules 50-60cm• Total max ring length 2-3m• I2C line max length ???Saverio Minutoli INFN Genova 29H.V. architecturePatch -PanelDCSSCADAOPCServerA1733B28 Channels3 kV/3 mA or 4 kV/2 mA15SHVR.M.R.M.= 52 Radiall MultipinPatch -PanelPatch -PanelPatch -PanelPatch -PanelR.M. 15SHV15SHV15SHVR.M.R.M.3 x R.M.22Saverio Minutoli INFN Genova 30 Voltages: -10V, -5V, +5V, +2.5V Current (1/4 T1): CFEC: 4A@-10V; 4A@-5V; 70A@5V; 30A@2.5V AFEC: 7A@2.5V Power Supply: Need to have a local solution. WIENERLow VoltagesSaverio Minutoli INFN Genova 31Summary The CSC parameters are well known We are ready to start with the FE electronic prototypes design. VFAT2 can be adopted how complete FE for the CSC anodes wires (only one channel tested): Need an external passive circuit to reduce and adapt the detector signal amplitude. Tests will continue in Genoa, now we are ready to use a new gas mix Ar/CO2/CF4  40/50/10. The AFEC are rad. hard., CFEC can operate up to L=1033cm-2s-1 The VFAT digital is of course used in the cathodes FE electronic chain. The anodes will be used to generate the trigger bits pattern, the VFAT trigger sector logic function is involved. Possible to use the same VFAT mezzanine as T2: We have to check the connectors and the dimensions. Needs to check the Control Ring configuration, in particular the maximum electrical cable connections length. We agree to use the same low voltages power supplies as CMS.Saverio Minutoli INFN Genova 32 Extra slidesSaverio Minutoli INFN Genova 33CSC transmission line impedance measure Pulse 1V@10 ns Z_anode=330-390 W [ R = 115 W/m] Z_cathode=120-150 WSaverio Minutoli INFN Genova 34CSC capacitance test-benchTwo and four terminals LCR methodsStray and various parasite cap. Use of a guard plate and shielding, to minimizetest leads stray cap. and noise pick-upSaverio Minutoli INFN Genova 35Half strip accuracyThe LCT-COMP allows to identify the charge distribution on CSC to a half strip accuracy. It permits to give the right or left position of an event within a strip.The LCT-COMP logic digitize the position of an event within 2 consecutive strips with a 3 serial bits word. Peaking time adjustable within 25÷200ns.The serial data stream are unusable in our system, we need a deserializer.The choise could be the ACTEL antifuse programmable devices A54SX32A, tested and qualified up to ~50krad by the INFN-BO group.NN-1SERIAL CODE 100N+1N+2N+1NSERIAL CODE 110N+1NN-1SERIAL CODE 101N+2N+1NSERIAL CODE 111Saverio Minutoli INFN Genova 36CSC Anode and CathodesAsymmetric and large distribution charge on cathodesSaverio Minutoli INFN Genova 37Side view of a T1 halveSide view of a T1 quarter

T1 Electronic Design Review

Abstract

Similar works

Full text

Available Versions

CERN Document Server