Abstract

A proof-of-principle experimental setup for the extraction of 6 GeV electrons from the DESY II Booster Synchrotron using the channeling effect in a bent crystal is elaborated. Various aspects of the experimental setup were investigated in detail, such as the particle beam dynamics during the extraction process, the manufacturing and characterization of bent crystals, and the detection of the extracted beam. In order to optimize the crystal geometry, the overall process of beam extraction was simulated, taking into account the influence of radiation energy losses. As result it is concluded that the multi-turn electron beam extraction efficiency can reach up to 16%. In principle this crystal-based beam extraction technique can be applied at any electron synchrotron in order to provide multi-GeV electron beams in a parasitic mode. This technique will allow to supply fixed-target experiments by intense high-quality monoenergetic electron beams. Furthermore, electron/positron crystal-based extraction from future lepton colliders may provide an access to unique experimental conditions for ultra-high energy fixed-target experiments including searches for new physics beyond the Standard Model.

Highlights

  • Test beam and irradiation facilities are key infrastructures for detector development in High-Energy Physics (HEP)

  • If the beam hits the scintillator material, light is created in a multistage stochastic process with an intensity distribution which is proportional to the charge density of the incoming beam, resulting in a beam image that can be detected using a conventional area scan camera

  • In the present monitor setup, Lu2(1−x)Y2x SiO5:Ce (LYSO:Ce) is used as scintillator material, and the intensity profile is detected by means of a standard CMOS camera

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Summary

Introduction

Test beam and irradiation facilities are key infrastructures for detector development in High-Energy Physics (HEP). As a second step these photons hit a converter target (metal plate), such generating electron/positron pairs which are selected by species and momentum depending on the polarity and the strength of the magnetic field of the subsequent dipole magnet spectrometer Using such internal target, a low rate of secondary particles can be produced at every bunch crossing, fulfilling the test beam user requirement for a low multiplicity beam. In the remainder of this article, a design proposal for a proof-ofprinciple experiment is worked out in order to study a crystalbased beam extraction at the booster synchrotron DESY II In the future, this scheme could be applied in order to realize a primary beam extraction for the DESY II Test Beam Facility

Crystal-assisted beam steering
The DESY II accelerator and beam extraction scheme
Beam extraction setup
Required deflection
A trajectory in a crystal
Radiation losses
Accelerator routine
Channeling effect simulation
Radiation energy losses
Multi-turn simulations of crystal-based extraction
Technologies of bent crystal manufacturing
Bent crystal characterization
Preliminary experimental setup design
Findings
Conclusions
Full Text
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