front tracker : m ain t echnical solutions
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Front Tracker: main technical solutions
40x50 cm2
module
Front Tracker Chamber: 40x150 cm2
Use COMPASS approach: 3xGEM, 2D readout - one significant difference: new single mask
GEM foil (instead of double mask) – cheaper and faster production
Modular design: chambers consists of 3 independent GEM modules (40x50 cm2) with thin
dead area
Electronics around the module, direct connection; 90 degree bending between modules
External support frame in carbon fiber (long bars) to minimize thermal deformation
SBS Front Tracker 1
Requirements:
Hit spatial resolution ~ 70 m
Stand large background ( ~ 250 MHz/cm2, e/ 160 kHz/cm2)
Transverse area > 40x120 cm2
Event rate ~ 20 kevents/s
Reuse: SBS/GEp5, BigBite/Gen, BigBite/A1n …
Gluing
Finalization(solder resistor, check HV)
Stretching
Electronics integrationTest and characterization by rad.
source and cosmics
Permaglas FramesVisual InspectionUltrasound bath
cleaning
GEM FoilsHV curing and
quality test
Put together(align on reference pins)
Glue Curingin vacuum
(>24 h)
Assemblinggas lines
ElectronicsTest
SBS Front Tracker 2
Clea
n ro
om
Module production fully established in Catania
Module characterization in Rome
Production speed 1 module/month
FT: GEM Module construction process
Front Tracker: Readout Systems
Based on APV25 chip (from CMS)
Topology: Chamber Strips FE (APV25) Backplane MPD (VME) DAQ
Custom design, compliant to JLab DAQ environment; reviewed October/2012 by fast electronics and DAQ experts;
First version succesfully used in the OLYMPUS experiment in 2012.
SBS Front Tracker 3
VME crate
• 128 analog ch / ASIC
• 3.4 s trigger latency (analog pipeline)
• Capable of sampling signal at 40 MHz
• Radiation tolerant
• Multiplexed analog output
• Configurable / Calibration circuit
Real Experiment: Olympus, 2012
From Jürgen Diefenbach
The APV electronics has been installed on the Olympus 3xGEM tracker made of 6 10x10 chambers with 2D readout (pad/strip – about 2500 chs), operating in a magnetic field at the level of few kG.
Two events with opposite magnet polarity; particles bend left o right in the x-histogram
(Red triangles show hit candidates)
SBS Front Tracker
Use of the INFN readout electronics
4
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