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Neutron Rate Calculations from Deuterium Gas and Aluminum Windows Using Monte Carlo Techniques

This presentation by Pavel Degtiarenko, delivered by Richard Lindgren, discusses the calculations of neutron rates from aluminum windows and deuterium gas targets in a Monte Carlo framework. At a luminosity of 10.37 cm⁻² s⁻¹, the maximum neutron rates are estimated at 6.0 x 10⁻⁷ e⁻¹ sr⁻¹ for aluminum with deuterium and 4.0 x 10⁻⁷ e⁻¹ sr⁻¹ for pure deuterium gas. The study suggests that neutron detection from deuterium gas appears challenging, highlighting the need for effective detector design using segmented scintillators.

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Neutron Rate Calculations from Deuterium Gas and Aluminum Windows Using Monte Carlo Techniques

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  1. Equivalent(virtual) Photon Approximation Monte Carlo Calculationsof Neutron rates from Al windows and Deuterium gasPavelDegtiarenkoPresented by Richard Lindgren

  2. RTPC Target Cell Parameters from JixieLuminosity =10 37 cm-2 s-1About 50 uA on 20 cm long T=20K and P=2 Atm Deuterium gas target

  3. Neutron Rate Calculations • For Al + D2 gas at 20 deg the max neutron rate = 6 x 10 -7 e -1 sr-1 • For D2 gas alone, the rate = 4 x 10 -7 e -1 sr-1 Scales with thickness • Using Luminosity 10 37 cm-2 s-1the neutron rate =2.4 x10 9/sec into 4pi • Looks hopeless for neutron detection from deuterium. • Suppose you have a segmented array of 5 cm x 5 cm scintillators or smaller at 2 m or even further away from the target until the rate was tolerable. eg. Rate =4.7 x 105/s per scintillator counter for 5 cm x 5 cm at 2 m. This assumes that the dominant source of neutrons is from the target and not the room. • For hydrogen gas I don’t have the neutron background numbers but it would be less and probably due mostly from the neutrons in the Al chamber window.

  4. Target D2 gas 0.0488 gm/cm2

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