1. Reports from DESY Satoru Uozumi (Staying at DESY during Nov 11 – 25) Nov-21 GLDCAL Japan-Korea meeting

2. 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 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, Integrating temperature monitoring etc…

3. 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 ECAL module FPCB Scheme of the Readout Electronics

4. 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 8pF4pF2pF1pF 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

5. 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 separation 2. 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)

6. Pedestal – 1 p.e. Peaks Separation (Calibration mode) Coaxial ~ 2 m To HCAL baseboard MPPC Clear fiber LED V bias – V 0 = 1.95 V V bias – V 0 = 2.95 V

7. Dynamic range (Physics mode) Pedestal (~1123 ADC counts) Saturated MPPC Signal (~20220 ADC counts) (20220-1123) / 226 * 19.1 = 1603 pixels Distance between pededestal – 1p.e. In Calibration mode Ratio of Gains between calib. and physics mode Dynamic range is enough for 1600 pixels !! V bias – V 0 = 2.95 V

8. 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 MPPC 80V -0.96V 80 - 0.96 = 79.04 V Baseboard single channel

9. Movable stage Can be controlled from Slow- control PC with user-friendly GUI. Specify position with 0.1 mm step

10. Data & Analysis The data are stored with a binary format on dcache system. 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 analysis framework. –Similar to CDF Run II analysis framework (my feeling) –Need C++ basics –http://Ilcsoft.desy.de/

11. Raw binary data LCIO data User analysis modules Database Detector 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

12. 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 ?

13. 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 !

14. 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.

15. 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.