High purity 100 GeV electron identification with synchrotron radiation
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Date
2017-09-11
Publication Type
Journal Article
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yes
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Abstract
In high energy experiments such as active beam dump searches for rare decays and missing energy events, the beam purity is a crucial parameter. In this paper we present a technique to reject heavy charged particle contamination in the 100 GeV electron beam of the H4 beam line at CERN SPS. The method is based on the detection with BGO scintillators of the synchrotron radiation emitted by the electrons passing through a bending dipole magnet. A 100 GeV pi- beam is used to test the method in the NA64 experiment resulting in a suppression factor of 10−5 while the efficiency for electron detection is 95%. The spectra and the rejection factors are in very good agreement with the Monte Carlo simulation. The reported suppression factors are significantly better than previously achieved.
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published
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Volume
866
Pages / Article No.
196 - 201
Publisher
Elsevier
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Subject
Synchrotron detector; Hadron rejection; High energy electron tagging
Organisational unit
03503 - Rubbia, André / Rubbia, André
Notes
Funding
169133 - NA64 - Search for Dark Sectors in Missing Energy Events (SNF)