Instrumentation for sFLASH
Journal
Proceedings of Science
Date Issued
2017
Author(s)
Shin B.K.
Atwood S.
Belov K.
Belz J.
Chen P.
Field C.
Fukushima M.
Hast C.
Huang J.
Huey H.
Liu T.
Ivanov D.
Jobe K.
Jui C.
Nam J.
Naudet C.
Matthews J.
Potts M.
Reil K.
Saltzberg D.
Sokolsky P.
Thomas S.
Thomson G.B.
sFLASH
Abstract
We will report on the setup and calibration of the instrumentation for sFLASH. The sFLASH experiment is a measurement of the air fluorescence from ?10 21 eV artificial air showers developed in an alumina target by an electron beam provided from End Station A of the Stanford Linear Accelerator Center (SLAC). sFLASH employs Photomultiplier tubes (PMTs) to detect the fluorescence photons and an Integrating Charge Transformer (ICT) to measure the beam current. The PMTs are positioned ?10m perpendicular to shower axis are used to measure the air fluorescence photons. The absolute gain of the PMTs was measured using CRAYS at the Institute of Cosmic-Ray Research, Japan. CRAYS is a PMT photo-gain calibration system consisting of a vessel containing nitrogen gas and a 14£gJ nitrogen (337.1 nm) laser. The gain of each PMT was monitored during the course of the experiment using a YAP puiser (YAIO: Ce + 241 Am) potted into an ultraviolet optical filter attached to the surface of the PMT window. We expect to achieve an overall experimental uncertainly of ?6%. The ICT (Bergoz) consists of 20 turns of coil to measure the beam current. In sFLASH experiment we set it ?1 m away from beam exit to measure the beam current just prior to entering the target material. The ICT was calibrated with 2 ns pulse generator at Jet Propulsion Laboratory. The calibration uncertainty of the ICT is ?1%. ? Copyright owned by the author(s) under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives 4.0 International License (CC BY-NC-ND 4.0).
Type
conference paper