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Shashlyk FE-DAQ requirements
Pavel Semenov IHEP, Protvinoon behalf of the IHEP PANDA group
PANDA FE-DAQ workshop, Bodenmais22-24 April 2009
22-24 April 2009 Pavel Semenov, PANDA FE-DAQ Workshop, Bodenmais 2
PANDA calorimeters
22-24 April 2009 Pavel Semenov, PANDA FE-DAQ Workshop, Bodenmais 3
Fast MC (photons energy distribution)
All photons energy (upper curve) over photons at the Shashlyk aperture (color curves)
22-24 April 2009 Pavel Semenov, PANDA FE-DAQ Workshop, Bodenmais 4
Time between energy depositions (one cell)
Near pipe Detector vertical edge
22-24 April 2009 Pavel Semenov, PANDA FE-DAQ Workshop, Bodenmais 5
Shashlyk signal shape (cosmic muons)
Rise time ~10 ns,tail ~40 ns
22-24 April 2009 Pavel Semenov, PANDA FE-DAQ Workshop, Bodenmais 6
Shashyk module sizes
22-24 April 2009 Pavel Semenov, PANDA FE-DAQ Workshop, Bodenmais 7
Shashlyk module tail stucture
Two types of possible mounting of the module: 4 tubes or 1 screw
22-24 April 2009 Pavel Semenov, PANDA FE-DAQ Workshop, Bodenmais 8
Overall design of the FS EMC
27x14 modules (4cells each)
Frame sides to put FEE crates (~3 meter signal cable from PMT to ADC)
Back plate to fix modulesin Z direction (modules position from one side and photodetectors from the other side of the plate )
Accelerator pipe hole (2x2 modules) shiftedfrom the centerDedicated rail systemfor maintenance procedure
22-24 April 2009 Pavel Semenov, PANDA FE-DAQ Workshop, Bodenmais 9
Detector sizes
Active zone 2970x1540 mm2
22-24 April 2009 Pavel Semenov, PANDA FE-DAQ Workshop, Bodenmais 10
Answers to some questions from a previous workshop
• Signal dynamic range 3 MeV- 15 GeV
• Noise 1-3 MeV ? (testbeam showed pedestals sigma 5-6 MeV, mainly due to correlated pickup)
• Hit rate 1 MHz near beam pipe, 300 kHz detector edge (per channel, energy over threshold)
• Photodetector (PMT) signal (10 ns + 40 ns) goes directly to sampling ADC (180 MHz, 12 bits?) with 3 meter cable
• Data size ~10 samples per event per channel
• Overall channels: 1500, typical event size 3-5 photons (~100 amplitudes after feature extraction)
• Tracking system information can be used to reduce data flow
• Light injection monitoring system events readout
• Prototype tested with slow ADC, next testbeam to test shashlyk performance with sampling ADC (Uppsala SADC?)
22-24 April 2009 Pavel Semenov, PANDA FE-DAQ Workshop, Bodenmais 11
Backup slides
22-24 April 2009 Pavel Semenov, PANDA FE-DAQ Workshop, Bodenmais 12
Calorimeter at the maintenance position
To provide a possibility of Shashlyk maintenanceA dedicated extensible rail system is proposed.
Calorimeter can be shifted out to the left or the right side of the Forward Spectrometer.
At the working positionit fixed by lock pins with high precision
22-24 April 2009 Pavel Semenov, PANDA FE-DAQ Workshop, Bodenmais 13
Testbeam setup
DC1M14 DC2DC3
DC4ECALBeam
• Spectrometer consisted of 4 drift chamber stations and a magnet to measure beam particle momentum precisely
• Calorimeter prototype
• Al target at 1.5m and 3 m before the prototype
S1S2S3St
Target
SA
22-24 April 2009 Pavel Semenov, PANDA FE-DAQ Workshop, Bodenmais 14
Testbeam results for 1.5 m (more sophisticated analysis)
Shower profile fit,Charged hadrons removed (drift chamber),Rough calorimeter calibration
π0 1-2 GeV, σm 12.5 MeV
Next steps:Precise calibration,All data analysis,Big and small cell performance comparison
22-24 April 2009 Pavel Semenov, PANDA FE-DAQ Workshop, Bodenmais 15
Registered neutral pions energies at 3 m target position
22-24 April 2009 Pavel Semenov, PANDA FE-DAQ Workshop, Bodenmais 16
Energy and position resolution in “big” modules
σE /E = 3.5/E 2.8/√E 1.3 [%], E in GeV σx = 13.1/√E 4.0 [mm], E in GeV
22-24 April 2009 Pavel Semenov, PANDA FE-DAQ Workshop, Bodenmais 17
New prototype parameters
64 cells (16 supermodules) assembled in matrix• 380 layers of 0.3-mm lead and 1.5-mm scintillator,
total length 680 mm• Transverse size 55x55 mm2
• Effective Moliere radius: RM=59 mm
• Effective radiation length: X0=34 mm
• Total radiation length: 20X0
• Light collection: 36 fibers BCF-91A (1.0 mm)
22-24 April 2009 Pavel Semenov, PANDA FE-DAQ Workshop, Bodenmais 18
Prototype modules production