FT Cal and FT Hodo DAQ and Trigger

Transcription

1 FT Cal and FT Hodo DAQ and Trigger

2 Outline FT-Cal and FT-Hodo read-out electronics FT-Cal and FT-Hodo DAQ and trigger FADC250 firmware CTP firmware for FT-Cal and FT-Hodo FT-Cal and FT-Hodo crates and racks Composition and layout Internal connections FT-Cal and FT-Hodo slow-controls Online Monitoring

3 FT Cal and FT Hodo readout electronics For both FT-Cal and FT-Hodo the same system used by CLAS12 fast detectors will be employed, based on JLAB FADC independent channels 4 ns sampling time, 12 bits. Input range: 2 V 8 s trigger latency Pulse elaboration algorithm embedded: Energy Timing Scaler Trigger formation capabilities Fast serial line on custom VME-VXS backplane to connect to Crate Trigger Processor If needed, we can use also discriminators + TDCs. (Discriminator: JLab made, TDC: CAEN VX1190A, 100 ps LSB, 128 ch) Studies are underway to evaluate if FADC timing is enough for our application (see R. De Vita talk)

4 FT Cal and FT Hodo readout electronics: FADC250 embedded QDC algorithm Trigger When a trigger is received by the FADC board, the algorithm searches for peaks in the recorded samples and calculates their charge. A peak is found whenever signal is greater than a programmable threshold TET For each peak, its maximum value V p and its position are found NSB samples before the pulse and NSA samples after the pulse are summed and repoterted to the DAQ Equivalent to a QDC with fixed integration window NSB+NSA long centered at the peak position This algorithm has been tested offline during Frascati test of FT-prototype (see F. Cipro talk). FADCs used in the test had same characteristics as JLab model (CAEN v1720, 12 bit, 2 V)

5 FT Cal and FT Hodo DAQ and trigger Forward Tagger DAQ system: The Forward Tagger will be handled by the standard DAQ system for CLAS12, i.e. CODA No special requirements, we use the standard read-out electronics, i.e. FADC and TDC Forward Tagger Rate: FT-Cal max rate ~ 500 khz/ch (over 10 MeV thr), mainly EM background Good Events (clusters with energy between 0.5 and 4.5 GeV) ~ 200 khz (whole FT-Cal) FT-Cal and FT-Hodo will be part of CLAS12 triggering process. For the MesonEx experiment we require coincidence between FT and CLAS12 within 50 ns window: 3.6 khz (good) + 2 khz (random) events to readout.

6 FT Cal and FT Hodo in CLAS12 trigger CLAS12 trigger layout for fast detectors. LEVEL 1 LEVEL 2 2 level trigger system. Level 1 mainly performed in single VXS crate hosting FADCs. Level 2 performed in global trigger crate. FT-Cal and FT-Hodo will be part of L1 trigger. Coincidence with CLAS12 performed at higher level. FT-Cal: clusters in the calorimeter. FT-Hodo: matched hits in both layers. Cluster algorithm is running on FADCs and CTPs, with limited connectivity between boards in different VXS crates. FT-Cal needs to VXS crates for read-out: channels near the border will be splitted twice and sent to both VXS crates. 14 channel more for each crate. Channels are divided equally between two crates ( channels each VXS crate)

7 FT Cal and FT Hodo trigger: FADC250 firmware A starting point to investigate is the firmware that has been successfully used in the HPS experiment test run (spring 2012). Whenever a signal crosses the threshold: Threshold crossing time is recorded and reported to CTP (4 ns resolution) Samples over threshold are summed together, then the result is scaled by a programmable value and sent to CPT (5 bit resolution, ~ 60 MeV for 2 GeV full-scale). FADC firmware is currently being upgraded at JLab to introduce new trigger features (better resolution, online calibration constants..)

8 FT Hodo and FT Cal racks: composition Number of independent channels: 332 (FT-Cal) (FT-Hodo). FT-Cal is divided in two halfs, channel each ( +14 is for triggering, see previous slide). Two options: with and without discriminators and TDCs for FT-Hodo and FT-Cal. Option #1: with discriminator and TDCs FT-Cal # Discr. Boards (16 ch each) # TDC Boards (128 ch each) 3 2 # FADC Boards (16 ch each) # Splitters (16 ch each) FT-Hodo # HV channels FT-Cal: 332 APD biased in groups of 9 or 10 FT-Hodo: 232 SiPM biased in groups of 8 # LV channels FT-Cal: +5 V and -5 V for each MOBO sector. +5 V and +12 V for LED pulser FT-Hodo: +6 and -6 V for SiPM amplifier crate. Option #2: without discriminator and TDCs As above, without first two lines. Splitters still used as patch-panels.

9 FT Hodo and FT Cal racks: crates Wiener VME-VXS crate (11 U): 21 slots. 4 occupied by ROC, TI, CTP, SD. 17 free for FADCs FT-Cal FT-Hodo Total Min # VXS crates # FADC Boards (16 ch each) VME crate (11 U): 21 slots. 2 occupied by ROC, TI. 19 free for discriminators or TDCs. If TDCs are mounted in a VME crate, 1 slot is occupied by F-OUT module. # TDC Boards (128 ch each) # Discriminators (16 ch each) FT-Cal FT-Hodo Total Min # VME crates # VME devices SY1527 Caen HV crate (8 U) MPOD Wiener LV crate (8U) Splitters (1U each) Total rack space required (FT-Cal + Ft-Hodo): FT-Cal FT Hodo TDC? YES NO YES 118 U 96 U NO 92 U 85 U

10 FT Hodo and FT Cal racks: layout (with TDCs) RACK #1 RACK #2 RACK #3 Using 47 U racks (210 cm) RACK #1: 41 U used, 6 available 11 splitters 11 splitters 15 splitters VME Cal 1: 11 Discr. + 3 TDC + F-Out VXS Cal 1: 12 FADC RACK #2: 40 U used, 7 available VXS Cal 1 VXS Cal 2 VXS Hodo VME Cal 2: 11 Discr. VXS Cal 2: 12 FADC RACK #3: 37 U used, 10 available VME Cal 1 VME Cal 2 VME Hodo VME Hodo: 15 Discr. + 2 TDC + F-Out VXS Hodo: 15 FADC HV Power Supply LV Power supply FT-CAL FT-Hodo Temperature monitor can be mounted in RACK #3

11 From FT-CAL 166 3M cables 166 TDC cables from VME1 166 TDC cables from VME2 From FT-Hodo 232 3M cables 232 TDC cables from VME Hodo Racks: internal connections (with TDCs) RACK #1 Splitters VXS Cal 1 VME Cal 1 HV RACK #3 Splitters VXS Hodo VME Hodo 166 BNC/LEMO 166 LEMO/LEMO 232 BNC/LEMO 232 LEMO/LEMO 14 LEMO/LEMO from RACK#2 to FT-Cal 3x48 pin cables to FT-Trck 3x2 pin cables RACK #2 From FT-CAL 166 3M cables 166 BNC/LEMO Splitters VXS Cal 2 VME Cal 2 LV 166 LEMO/LEMO 14 LEMO/LEMO from RACK#1 to FT-Cal 4x4 pin cables to FT-LED 1x4 pin cables to FT-Hodo Ampli Crate 2x4 pin cables

12 FT Hodo and FT Cal racks: layout (without TDCs) RACK #1 RACK #2 Using 47 U racks (210 cm) RACK1: 43 U used, 4 available 22 splitters 15 splitters VXS Cal 1: 12 FADC VXS Cal 2: 12 FADC VXS Cal 2 VXS Hodo RACK2: 42 U used, 5 available VXS Hodo: 15 FADC VXS Cal 1 HV Power Supply Temperature monitor can be mounted in RACK #2 LV Power supply FT-CAL FT-Hodo

13 From FT-CAL 332 3M cables Racks: internal connections (without TDCs) RACK #1 Splitters VXS Cal LEMO/LEMO 180 LEMO/LEMO VXS Cal 2 From FT-Hodo 232 3M cables RACK #2 Splitters VXS Hodo HV LV 232 LEMO/LEMO to FT-Trck 3x2 pin cables to FT-Cal 3x48 pin cables to FT-Cal 4x4 pin cables to FT-LED 2x4 pin cables

14 FT Cal and FT Hodo slow controls EPICS system will be used as solution for slow-controls, following standards and suggestions from Hall-B slow-controls group. High Voltage and Low Voltage CAEN SY1527 HV system and Wiener MPOD LV systems are the standard for CLAS- 12 and will be integrated inside CLAS12 slow controls FT-Cal chiller (Lauda XT150) Chiller has its own feedback system, will use it. The set-point will be controlled and monitored trough serial connection. Temperature Currently, PT100 read by Agilent datalogger. Need to investigate if EPICS support is available. Otherwise, system from Delta will be used (standard for CLAS) LED Pulser Pulser circuit is controlled by a microcontroler with Ethernet support. We will write its firmware, EPICS-compatible.

15 FT Cal and FT Hodo online monitoring We have developed two applications to online monitor the FT-cal proto16. 1 application written in Java with custom classes for histograms and graphs 1 application written in C++ using ROOT libraries Both use ET-Ring and EVIO file format, and can be expanded to be used with the Forward Tagger. Data files already written can also be opened for preliminary checks. Event Producer (DAQ EB) ET System Event Recorder (DAQ ER) Monitor (ET system nonblocking station) Relevant quantities to monitor: Waveforms from FADC Energy deposited in each crystal Total energy deposited in the FT-Cal Energy distribution in the FT-Cal (clusters) Timing Pedestals width and stability during time...

16 FT Cal and FT Hodo online monitoring Both softwares have been succesfully used in Frascati during FT-proto test (see F. Cipro talk) Charge profile and CoG Total energy in FT-Cal Waveforms from FADC