Low energy, low intensity limits of scintillators

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Information about Low energy, low intensity limits of scintillators
Technology

Published on July 26, 2011

Author: jharas

Source: slideshare.net

Description

In order to investigate the limits of scintillating screens for beam profile monitoring in the ultra-low energy, ultra-low intensity regime, CsI:Tl, YAG:Ce, and a Tb glass-based scintillating fiber optic plate (SFOP) were tested. The screens response to 200 and 50 keV proton beams with intensities ranging from a few picoampere down to the subfemtoampere region was examined. The sensitivity and resolution studies are presented in detail for CsI:Tl and the SFOP, the two most sensitive screens. In addition, a possible use of scintillators for ultra-low energy antiproton beam monitoring is discussed.

Liverpool Group Seminar 15/09/2010Cockcroft Institute, Daresbury Low Energy, Low Intensity Limits of Scintillators Janusz Harasimowicz * J. Harasimowicz, L. Cosentino, P. Finocchiaro, A. Pappalardo, and C. P. Welsch, Scintillating Screens Sensitivity and Resolution Studies for Low Energy, Low Intensity Beam Diagnostics, Rev. Sci. Instrum. 81, 103302 (2010)

Content Motivation The Project Beam Profiles Results Resolution Beam Current Sensitivity Outlook15/09/2010 Janusz Harasimowicz 2

Motivation15/09/2010 Janusz Harasimowicz 3

Diagnostic Challenges • Low energy beams: <500 keV • Low intensity beams: <107 pps15/09/2010 Janusz Harasimowicz 4

Beam Profile Monitoring • Scrapers (time consuming) • Gas. detectors (too destructive) • SEE monitors (££, complex) • Gas-jet curtain (£££, complex, huge) • Scintillators (not sensitive) ?15/09/2010 Janusz Harasimowicz 5

The Question What are the limitations ofscintillators applied to keV proton beam profile monitoring?15/09/2010 Janusz Harasimowicz 6

The Project15/09/2010 Janusz Harasimowicz 7

People Involved myself Paolo Luigi Carsten P. Alfio Finocchiaro Cosentino Welsch Pappalardo INFN-LNS INFN-LNS INFN-LNS (not in the pic.)15/09/2010 Janusz Harasimowicz 8

Setup @ INFN-LNS 10-6 mbar 5°C15/09/2010 Janusz Harasimowicz 9

Particle Beams • Particles: protons • Energy: 200 keV & 50 keV • Intensity: down to few pA (plus attenuators)15/09/2010 Janusz Harasimowicz 10

Scintillators 1 mm thick Thallium-doped Caesium Iodide (CsI:Tl) 2 mm thick Terbium-doped glass Scintillating Fibre Optic Plate (SFOP) consisting of 10 µm diameter fibres 0.05 mm thick Cerium-doped YAG crystal(YAG:Ce) deposited onto a 4 mm thick glass base 15/09/2010 Janusz Harasimowicz 11

Setup YAG:Ce CsI:Tl15/09/2010 Janusz Harasimowicz 12

Results15/09/2010 Janusz Harasimowicz 13

Beam Profiles15/09/2010 Janusz Harasimowicz 14

Beam Images15/09/2010 Janusz Harasimowicz 15

Beam Images15/09/2010 Janusz Harasimowicz 16

Background Subtraction15/09/2010 Janusz Harasimowicz 17

Resolution15/09/2010 Janusz Harasimowicz 18

Observed FWHM CsI:Tl SFOP15/09/2010 Janusz Harasimowicz 19

Observed FWHM CsI:Tl SFOP0.3 – 0.8 mm15/09/2010 Janusz Harasimowicz 20

Complex Structures CsI:Tl15/09/2010 Janusz Harasimowicz 21

Beam Current15/09/2010 Janusz Harasimowicz 22

Absolute Measurements• Faraday cups (not sensitive)• Attenuation factors (spatial resonances)• Light calibration (uncertainty)15/09/2010 Janusz Harasimowicz 23

Light Yield Calibration* • CsI:Tl calibrated with 241Am • Results rescaled to keV protons • … and to SFOP • Systematic indetermination of one order of magnitude assumed* A. Pappalardo, L. Cosentino, and P. Finocchiaro, An Imaging Technique for Detection and Absolute Calibration of Scintillation Light, Rev. Sci. Instrum. 81, 033308 (2010) 15/09/2010 Janusz Harasimowicz 24

Sensitivity15/09/2010 Janusz Harasimowicz 25

Sensitivity Limits15/09/2010 Janusz Harasimowicz 26

Sensitivity Limits200 keV: sub-fA (~5×103 pps)50 keV: ~4-5x worse (CsI:Tl) ~100x worse (SFOP)15/09/2010 Janusz Harasimowicz 27

Outlook15/09/2010 Janusz Harasimowicz 28

Challenges @ USR* • Particles: anti-p & protons • Energy: 300 keV & 20 keV • Intensity: 5×105 – 106 pps (extraction)* C. P. Welsch, M. Grieser, J. Ullrich, and A. Wolf, An Ultra-low-energy Storage Ring at FLAIR, Nucl. Instrum. Methods Phys. Res. A 546, 405 (2005) 15/09/2010 Janusz Harasimowicz 29

Annihilation Fast pionsAntiproton Recoiling nuclear fragments … 15/09/2010 Janusz Harasimowicz 30

Questions?15/09/2010 Janusz Harasimowicz 31

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