Determination of the Energy Characteristics of an Electron Beam Using a Light Scintillator
- PDF / 856,523 Bytes
- 5 Pages / 612 x 792 pts (letter) Page_size
- 83 Downloads / 176 Views
EAR EXPERIMENTAL TECHNIQUE
Determination of the Energy Characteristics of an Electron Beam Using a Light Scintillator V. I. Alekseeva, V. A. Baskova,*, V. A. Dronova, A. I. L’vova, A. V. Koltsova, Yu. F. Krechetovb, and V. V. Polyanskya aLebedev b
Physical Institute, Russian Academy of Sciences, Moscow, 119991 Russia Joint Institute for Nuclear Research, Dubna, Moscow oblast, 141980 Russia *e-mail: [email protected] Received March 13, 2020; revised March 30, 2020; accepted April 7, 2020
Abstract—The possibility of using the effect of full energy release in a light scintillator when an electron beam passes through it to determine the energy characteristics of a low- and medium-energy beam (the “absorbed energy” method) is experimentally shown. Using scintillation detectors with thicknesses of 14.5, 20, 23.5, and 51.2 cm, the energy calibration of the quasi-monochromatic electron beam of the Pakhra FIAN accelerator was performed. For electron-beam energies of up to ~100 MeV and scintillation-detector thicknesses from 5 to 20 cm, the accuracy of determining the electron-beam energy may be 10–20%, respectively. DOI: 10.1134/S0020441220050073
INTRODUCTION The energy characteristics of an electron beam include the maximum and average energy, as well as the energy spectrum. Synchrotron, Cherenkov, and transient radiations carry information on the energy parameters of the beam. The total energy of the beam is directly measured using the calorimetric method. The energy characteristics can be determined either by one of the methods or simultaneously by several methods [1]. This paper shows the possibility of determining the energy characteristics of an electron beam in the energy range of several hundred megaelectronvolts using the calorimetric method, in which a light scintillator is used. The essence of this method is to determine the characteristics of the beam by changing the thicknesses of scintillation detectors or to change the electron-beam energy at a fixed scintillator thickness to a value at which the trajectories of individual electrons completely fit into the detector volume. In this case, the average energy of beam electrons corresponds to the integral of the average ionization loss of the electron energy per unit path in the detector E = kL, where k = ΔE/Δx (ΔE/Δx is the average ionization loss of electrons per unit path in the detector), and L is the scintillation-detector thickness) [2]. EXPERIMENTAL APPARATUS The research was performed on a quasi-monochromatic beam of secondary electrons of the Pakhra FIAN accelerator (Fig. 1). A copper plate with a thick-
ness of 3 mm and a 3.2-mm diameter that was located on the “cut” of the magnet poles served as the converter [3]. The trigger signal T was a signal from the coincidence of signals of scintillation polystyrene counters S1–S3 and the anticoincidence counter A with a hole diameter of 10 mm (T = (S1 × S2 × S3) A). The dimensions of the S1–S3 and A counters were 15 × 15 × 1 and 60 × 90 × 10 mm, respectively. The intensity of the secondary electron bea
Data Loading...
