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\section{Triggers to be Used}
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Isolated charged particles can be obtained from minimum bias events.
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However with the increase in the luminosity of the machine, the minimum
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bias events will be highly suppressed by some large prescale factors in
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the trigger. So minimum bias trigger can be considered only at low
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luminosities. There are two basic requirements in these measurements:
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\begin{enumerate}
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\item Measurement of response of low momentum particles need to be made
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with the hadron calorimeter read out with no zero suppression
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scheme. This is needed to overcome the strong nonlinear behaviour
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of calorimeter response at lower energies.
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\item Calibration of the hadron calorimeter requires large number of
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tracks with sufficiently high energy and non-interacting in the
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electromagnetic calorimeter.
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\end{enumerate}
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Rate for low energy particles is fairly large; but a dedicate trigger may
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be needed to have HCAL readout in a special mode. Rate for high momentum
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tracks is smaller and prescale for the jet triggers will significantly
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cut this rate further. So a dedicated high level trigger may be useful
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to provide a comfortable rate for isolated high momentum hadrons.
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