Detector DAQ Status Jean-Sebastien Graulich, Geneva o Since CM 16 o Detector DAQ software o Front End Electronics o Schedule Milestones o Summary MICE CM 17 Feb 07 Jean-Sébastien Graulich 1
Since CM 16 u DAQ Software Training in CERN-ALICE group Completed n u Test of Front End Electronics for TOF and EMCal n n n u We have been officially granted the right to use DATE Decision to use CAEN V 1724, 100 MHz, 14 bit flash ADC Successful tests of the Shaper/Amplifier coupled to the flash ADC Decision to use Lecroy 4415 A Discriminators available in Geneva for TOF in Phase 1. Start working on a technical design for the Particle Trigger MICE CM 17 Feb 07 Jean-Sébastien Graulich 2
DATE Vocabulary u LDC : Local Data Concentrator n u GDC : Global Data Collector n u DATE Event = DAQ Event !!! It contains data for several Particle Events (~600) Trigger Receiver n u Event Builder Event n u The PC connected to the VME crate via the PC-VME Interface Input Register (with several inputs) receiving the signal informing the LDCs that something has happened, e. g the spill is finished and the data should be readout (= DAQ Trigger) Event Type n Tag attached to the event depending on which trigger receiver‘s input has been used. MICE CM 17 Feb 07 Jean-Sébastien Graulich 3
DATE Readout Process u Two processes running in each LDC n n u The readout process waits for a trigger, reads out the front -end electronics, and fills a FIFO buffer with the sub-event data The recorder process off-loads the FIFO and sends the subevent data to one (or several) GDC over the network Each LDC contains a set of Equipments n n Equipment =~ 1 Vme board (in MICE) Each equipment has its own set of routines for its initialization and readout. Adding an equipment is done without recompiling all DATE Equipment configuration data is saved in MYSQL database (but not archived) MICE CM 17 Feb 07 Jean-Sébastien Graulich 4
DATE Readout Algorithm u General algorithm for equipment readout: 5 user routines have to be implemented (XXX is the name of the equipment) n Arm. Hw. XXX l l n Asynch. Read. XXX l l n That is the readout itself Dis. Arm. Hw. XXX l MICE CM 17 Feb 07 Used only if the equipment needs to trigger the readout ( Trigger Receiver) Read. Event. XXX l n Executed constantly even when there is no trigger Don’t use ! Event. Arrived. XXX l n Executed at the beginning of the Run Allows initialization of the board Jean-Sébastien Graulich Executed at the end of the Run 5
DATE Data Format u The data sent by the equipment is just wrapped with a LDC header (+ a GDC header if used) Data from the equipment -> u u The data format in the payload is defined by the manufacturer of the equipment ! (we will stick to 32 bits words) DATE Header format defined in a header file event. h This file contains all the information the offline codes needs to know about DATE MICE CM 17 Feb 07 Jean-Sébastien Graulich 6
FEE Tests with cosmics u Testing the CAEN V 1724, 14 bits, 100 MHz Flash ADC Test similar to the one presented at CM 16 for the SIS 3320 Improvement: each PMT now connected to a TDC a QDC and a FADC Shaper TDC QDC Discr. Trigger Counter Shaper FADC QDC Discr. TDC Test done with TOF Scintillator bar and EMCal Pmts EMCal Twisted pair Cable => new shaper prototype MICE CM 17 Feb 07 Jean-Sébastien Graulich 7
Shaper Output Used for individual baseline evaluation Need for better tuning of baseline restorer The signal shape is still very well understood MICE CM 17 Feb 07 Jean-Sébastien Graulich Time (sample) 8
Charge and Time from FADC u The amplitude of the shaped signal is proportional to the original charge Voltage (adc ch) Max ~ Q 30% Max 25 u u T_th 30 35 40 45 Time (sample) 50 Very simple algorithm => Save CPU for offline analysis Comparing MAX with INTEGRAL allows simple detection of pile up n In case of pile up => Need more sophisticate algorithm MICE CM 17 Feb 07 Jean-Sébastien Graulich 9
Charge Resolution Double peak caused by 50 Hz structured noise on the base line (observed on the scope, also on the QDC line) MICE CM 17 Feb 07 Jean-Sébastien Graulich 10
Charge Resolution u Very good linearity n The few points off the line are l l l u u Out of QDC gate signal Noise in the line Pile up (rare) Intrinsic Resolution of FADC = 1. 8 QDC channels equivalent Better than the QDC itself = 2. 4 QDC channels MICE CM 17 Feb 07 Jean-Sébastien Graulich 11
Time Resolution u u Looking at the Time difference between Left and Right Pmts TDC is sensitive to Time Walk (and to the track angle) => Applying cuts on charge deposit in both PMTs makes the tail disappear MICE CM 17 Feb 07 Jean-Sébastien Graulich 12
Time Difference in FADC (ns) Time Correlation de er wi unt cm co 4 er gg tri Sigma = 490 ps e op Sl = 1 Sigma = 455 ps Time Difference in TDC (ns) u Resolution for time measurement in FADC : 210 ps Starting from 10 ns Sampling Period ! Assuming 100 ps resolution for the TDC measurement (including residual time walk) MICE CM 17 Feb 07 Jean-Sébastien Graulich 13
Linearity u Trigger counter moved by + and - 10 cm n n n u Peak shift: TDC not linear / FADC linear Refraction Index: TDCn = 2. 2 / FADCn = 1. 41 Sigma: Not constant / Constant Time difference in TDC is sensitive to Time Walk n MICE CM 17 Feb 07 Moving the trigger detector changes the relative amplitudes in Left and Right PMTs Jean-Sébastien Graulich 14
Shaper design 2 stages vs 4 stages u See Roumen’s talk Same Charge resolution: The 4 stages has more noise But also more gain u u Output is more symmetrical with 4 stages Components can be adjusted to reduce the full width while keeping the rise time > 4 samples n u The aim is to keep the width <= 450 ps so that we can record 10 samples before the signal (for the baseline measurement) and miss only one beam burst It allows reducing the occupancy time => Reducing the level of segmentation in SW (less channels -> less $) MICE CM 17 Feb 07 Jean-Sébastien Graulich 15
PID FEE for Stage 1 u Summary FADC V 1724 Shaper TDC V 1290 Discri LS 4415 A TOF 0 40 40 TOF 1 28 28 TOF 2 40? CKOV 8 8 - - KL 42 42 - - SW ? ? - - TOTAL 158 (+ SW) = 20 boards 158 (+ SW) = 10 boards 108 = 3 boards + 12 ch 108 = 7 boards MICE CM 17 Feb 07 Jean-Sébastien Graulich 16
FEE for Stage 1 u u u We have already 10 LS 4415 A in hand Ludovico has ordered 18 FADCs and 2 TDCs Maurizio has ordered 1 TDC Shaper production should start soon We should be ready to start with EMCal(KL) / TOF 0 / TOF 1 / CKOV For TOF 2, we miss n n u 2 FADCs 1 TDC (actually, only 12 channels) For EMCal(SW), we miss even the number of channels… n n The commercial agreement with CAEN is to buy 30 FADCs -> Min = 80 ch Original EMCal Design: 240 channels in total -> Max = 200 ch MICE CM 17 Feb 07 Jean-Sébastien Graulich 17
Particle Trigger Technical Design u u Work in Progress The current plan is to use Lecroy Logic Unit 4516 (CAMAC) n n u 2 in hand, 3 needed (one per TOF station) 9 available in CERN’s pool, (8 CHF/month, only reduced support) VME – CAMAC interface available for programming the logic (trivial programming) CAMAC crates available in Geneva Time reference for the trigger is the Burst Gate n n Present in all trigger condition -> Time reference won’t change (same offline cuts) Discussion ongoing on the availability of the Burst Gate. . MICE CM 17 Feb 07 Jean-Sébastien Graulich 18
Dispatch Panel (in Hand) These 4 channels Going to another splitter MICE CM 17 Feb 07 Jean-Sébastien Graulich 19
LEFT Pmts OR of 10 slabs UP and DOWN Pmts are not used for the trigger 2 by 2 coincidence RIGHT Pmts MICE CM 17 Feb 07 Jean-Sébastien Graulich 20
Schedule Milestones u Complete Flash ADC analysis: n n u u Delayed by ~ 1 month Order Hardware for Stage 1: n n n u Actually assed in beginning of December BUT extended to test new shaper prototype with EMCal Pmts -> Feb 2007 DAQ Test bench including Event builder: n Feb 2007 March 2007 Critical item: Network Switches should be ordered at the end of March Shaper production process will be launched Event builder will be ordered in April Move DDAQ system to RAL: n Nov 2006 Still reachable MICE CM 17 Feb 07 Jean-Sébastien Graulich July 2007 21
Summary u u u DATE software training Completed FE Electronics for PID has converged to a valid solution achievable for Stage 1 DAQ test bench is late Particle Trigger technical design progressing We still plan to install the DAQ system at RAL in July MICE CM 17 Feb 07 Jean-Sébastien Graulich 22
Скачать презентацию Detector DAQ Status Jean-Sebastien Graulich Geneva o Since
ad3f4b674d510194cdb7fedc3a17a156.ppt