reports from desy
DESCRIPTION
Reports from DESY. Satoru Uozumi (Staying at DESY during Nov 11 – 25) Nov-21 GLDCAL Japan-Korea meeting. My tasks @ DESY. Learn about CALICE Analog HCAL (AHCAL) readout electronics Actual operation of the DAQ system Confirm it has satisfactory performance for the GLD ECAL beam test - PowerPoint PPT PresentationTRANSCRIPT
Reports from DESY
Satoru Uozumi(Staying at DESY during Nov 11 – 25)
Nov-21 GLDCAL Japan-Korea meeting
My tasks @ DESY• Learn about CALICE Analog HCAL (AHCAL) readout elect
ronics– Actual operation of the DAQ system– Confirm it has satisfactory performance for the GLD ECAL beam test
• Gain of ASIC amp• Pedestal – 1 p.e. peaks separation with the MPPC• Bias voltage setting for individual MPPC• Dynamic range of the Amp and ADC• Separation of noise and MIP peak
• Data analysis– Basic analysis scheme with the CALICE analysis framework– Learn something from actual AHCAL analysis
• Other stuffs– Movable stage, LED monitor, Drift chambers, trigger counters, Integrat
ing temperature monitoring etc…
CRC board(in VME crate)
AHCAL module
To DAQ PC
HV supply(up to 100 V)
To Slow-control PC
Baseboard(6 analog boards mounted,
6 board x 18 chan. = 108 chan. )
GLD ECALmodule
FPCB
Scheme of the Readout Electronics
Analog Board ASIC scheme
100nF
10pF
Charge Preamplifier :
Low noise : 1300e- @40ns
Variable gain :
4bits : 0.67 to 10 V/pC
CR-RC² Shaper :
Variable time constant:4 bits (12 to 180ns)
12ns photoelectron measurement (calibration mode)180ns Mip measurement (physics mode)
12kΩ
4kΩ 24pF
12pF
3pF
in
8pF 4pF 2pF 1pF
40kΩ
8-bit
DAC
0-5V
ASIC
Rin =
10kΩ
50Ω
100MΩ 2.4pF
1.2pF
0.6pF
0.3pF
0.1pF
0.2pF
0.4pF
0.8pF
6pF
Gain of the ASIC Amp• We have 2 different modes under current setting :
1. Physics mode … lower gain, large dynamic range Can not see the ped – 1 p.e. peaks separation2. Calibration mode … high gain (~x20 of physics mode) Can see the peak separation
• We can choose the mode for each individual run.• Inter-calibration of the gain between these 2 modes is necessary. Will be
performed in MIP calibration run?• We can choose some other gains if we request, though I think current setting for AHCAL is useful enough.
MIP calibration run(Each with phys.and calib. mode)
Pedestal run(Each with phys.and calib. mode)
Beam run(Physics mode)
Pedestal run(Each with phys.and calib. mode)
……MIP calibration run(Each with phys.and calib. mode)
……LED calibration run
(Each with phys.and calib. mode)
Pedestal – 1 p.e. Peaks Separation (Calibration mode)
Coaxial~ 2 m To HCAL
baseboard
MPPC
Clear fiberLED
Vbias – V0
= 1.95 VVbias – V0
= 2.95 V
Dynamic range (Physics mode)
Pedestal(~1123 ADC counts)
SaturatedMPPC Signal
(~20220 ADC counts)
(20220-1123) / 226 * 19.1= 1603 pixels
Distance betweenpededestal – 1p.e.In Calibration mode
Ratio of Gainsbetween calib. and physics mode
Dynamic range is enoughfor 1600 pixels !!
Vbias – V0
= 2.95 V
Bias Voltage Control
• We can set value of the DAC output for each individual channel with ~0.02 V step
(5 V / 8 bit = 5 V / 256 count = 0.02 V / count)• Need to prepare a text table which contain DAC
counts for all the channels
HV supply
To Slow-control PC
8 bit DAC(0-5 V)
To MPPC80V
-0.96V 80 - 0.96= 79.04 V
Baseboardsingle channel
Movable stageCan be controlled from Slow-control PC with user-friendly GUI.Specify position with 0.1 mm step
Data & Analysis• The data are stored with a binary format on dcache s
ystem.• Expected raw data size (with 6 baseboards) is about
5 kB / events.
(very rough estimate, with +- 50% of uncertainty)• We can access to the binary data using the Marlin a
nalysis framework.– Similar to CDF Run II analysis framework (my feeling)– Need C++ basics– http://Ilcsoft.desy.de/
Raw binary data
LCIO data
User analysis modules
DatabaseDetector geometry,alignment, mapping,etc …
Plots, Ntuples, ….
Analysis scheme
• We need to request for database entry for our ECAL module• Need to prepare codes for detector geometry, mapping.• We also need to give a “Prefix” of our detector which is used as identifier in
the analysis module (like AHCAL) I propose “SCECAL” (SCintillator ECAL) for the prefix. (e.g. our calibration constants will be named SCECAL_CALIB on database)
Marlin framework
My tasks @ DESY• Learn about AHCAL readout electronics
– Actual operation of the DAQ system – Done– Confirm it has enough performance for the GLD ECAL beamtest – Done
• Peaks separation with the MPPC – Done• Gain of ASIC – Done• Bias voltage control for individual MPPC – Done• Dynamic range – Done• Separation of Noise and MIP peak – may be tested in this week
• Data analysis– Basic analysis scheme with the CALICE analysis framework - Done– Learn something from actual AHCAL analysis - ongoing
• Other stuffs– Movable stage - Done– Drift chambers – readout modules are now at CERN should be easy to operate– Trigger counters – Should be no problem (need a beam to check) – LED monitor - Difficult to integrate AHCAL system into GLD ECAL module– Integrate temperature monitoring into DAQ PC– Any Other ?
Experts @ DESY
• Felix ... The head• Erika ... Expert of everything in CALICE group• Beni … Expert of the AHCAL DAQ electronics and analysis
contact person of the GLDCAL beam test at DESY• Sebastian … Expert of software package• Niels … Expert of AHCAL analysis code• Nicola … Expert of SiPM / MPPC• Alexandra … Expert of SiPM / MPPC
They are really nice, and of course, very reliable !
Summary
• The AHCAL electronics and DAQ system have good performance satisfactory for the GLD ECAL beam test.
(There is still a concern about noise on FPCB, though)• Moreover we have many reliable experts at DESY .• Any other stuff at DESY (movable stage, triggers, drift chambers…) are OK.
• People who will attend to the beam test may need to be familiar with the caliceMarlin analysis framework.
Plan for this week
• AHCAL people may perform a test with positron beams. (test of forward-backward asymmetry of the AHCAL module) Attending this test would be a good exercise with the actual
beam.• I am requested to give a talk at DESY HCAL meeting in Thursday. I will give :
– 10 minutes talk– brief introduction of GLD ECAL beam test– My task and achievement at DESY– Lots of appreciation
• Then as long as time permits, I will learn about the actual analysis of AHCAL beam test data.