Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Calibration prototype for the EUDET HCAL   The electronics producing a few nanoseconds long LED pulses tuneable in the
amplitude and the optical system distributing the LED light to scintillators by
a single optical fibre are described. The properties of the LED pulses are
controlled by a computer connected via a CANbus to the controller on the board.
We produced a prototype with 6 LED pulse drivers placed on a 4-layer PCB with
dimension 250 x 147 mm2. The pulse width is constant and 3 ns long. Its
amplitude can be tuned from zero to 1.2 A. The pulse frequency can be set in
the range up to 100 kHz. The LED light is distributed by a 1 mm diameter
optical fibre. On the length of 2 m the fibre has every 30 mm a notch which
flashes light with homogeneity of \pm20%. The system is foreseen for
calibration of silicon photomultipliers embedded in scintillation tiles.

31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
4
The categories of this paper are: cond-mat
2
The categories of this paper are: math
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg