Mainz 2012 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 58: Instrumentation
HK 58.4: Talk
Friday, March 23, 2012, 12:00–12:15, P 3
Web-Controlled Pulse Generator for Energy Calibration of γ-Calorimeter — •Tudi Le Bleis, Max Winkel, Michael Bendel, Michael Böhmer, Roman Gernhäuser, and Ludwig Maier — E12, T.U. München, Garching bei München, Deutschland
The CALIFA Barrel will be part of the CALIFA γ-ray detector with a high granularity for the R3B Collaboration at FAIR. The Barrel is composed of about 2000 large crystals of CsI readout by APDs.
The signals are processed by a preamplifier and a fast-sampling ADC coupled to an FPGA. Whence designing the detector, a special care has been made of calibration methods. In particular how to continuously calibrate the detector during the experiment?
The electronic chain of the detector will be continuously monitored by a versatile pulse generator based on an FPGA and a 12 bits 20 MHz DAC.
The pulses will be generated at a variable frequency low enough not to disturb the beam measurement, but high enough to allow a monitoring of the response of the system. Each group of preamplifiers will get a separate pulser that also allows to monitor the electronics during and in between the beam pulses to monitor load dependent effects.
In the presentation, one implementation of the hardware of the pulse generator will be presented together with the web-based slow-control system developed for a good portability.
This work was supported by BMBF(06MT9156) and DFG (EXC153).