Fast calibration UV LED system for CALICE scintillator based tile hadron calorimeter
- Resource Type
- Conference
- Authors
- Polak, Ivo; Kvasnicka, Jiri
- Source
- 2012 IEEE Nuclear Science Symposium and Medical Imaging Conference Record (NSS/MIC) Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC), 2012 IEEE. :1240-1243 Oct, 2012
- Subject
- Bioengineering
Signal Processing and Analysis
Communication, Networking and Broadcast Technologies
Components, Circuits, Devices and Systems
Computing and Processing
ILC
CALICE
Calorimetry
LED
Calibration
Optical fiber
Silicon photomultiplier
SiPM
QRLED driver
notched fiber
- Language
- ISSN
- 1082-3654
We report on latest version of the calibration and monitoring system for the scintillator tile hadron calorimeter (AHCAL) for the ILC. Distribution of the light uses notched fibers, developed at our laboratory. One slab layer of the engineering AHCAL prototype is just being built and tested in the laboratory, uses 864 SiPMs embedded in small scintillator tiles and represents a part of the biggest planned detector equipped with SiPMs. Since SiPMs are sensitive to changes in temperature and operation voltage they need to be monitored. The monitoring system has to have sufficient flexibility to perform several different tasks. The self-calibration property of the SiPMs can be used for the gain monitoring using a low intensity of the LED light. A routine monitoring of all SiPMs during test beam operations is achieved with a fixed-intensity light pulse. The full SiPM response function is cross-checked by varying the light intensity from zero to the saturation level. In calibration systems we developed, we concentrate especially on the last aspect a high dynamic range of precise, few nanosecond pulses.