Operational Experience with the Ionization Beam Profile Monitor at COSY 18. Sept. 2018 | Christian Böhme, I. Bekman, K. Reimers, V. Kamerdzhiev | IKP-4

Jülich Picture: Openstreetmap.org

Christian Böhme | Dortmund, 20.1.2011 Supercomputer Deep Brain Pacemaker About 6000 employees 10 scientific institues Also hosts funding agency (~1000 employees) COSY Prof. Grünberg, Nobel Prize Physics 2007 Christian Böhme | Dortmund, 20.1.2011 Bilder: Forschungszentrum Jülich GmbH

COoler SYnchrotron (COSY): 184 m circumference Protons and Deuterons Polarized or un-polarized 1H+: 275 MeV/c - 3,65 GeV/c Stochastic and electron cooling 2 e- cooler: 100 keV and 2 MeV Typ. amount of stored particles: 1010 Internal experiments and 3 external beam lines H- stripping injection Build from 1989, commissioned 1993 2 MeV e-cooler Picture: Dietrich, J. and Mohos, I., PRAMANA - journal of physics 59 (2002), 1007

High Energy Storage Ring Circumference 574 m Momentum range 1.5 –15 GeV/c (anti-Proton) 1010 (initial) 1011(final) anti-protons stored Commissioning 2023 (latest)

IPM – short history IPM using Wegde & Strip anode (decommissioned 2009) Prototype test for FAIR – design by GSI Initial installation 2007 Readout requirements from FAIR and COSY different FAIR recording high speed (200 fps) and load later for processing over shared 100 Mbit network COSY online processing and low speed (1-10 fps), separate network (10 GBit) Software in LabView Optical readout using FireWire cameras (~5 m max cable length) Triggered frame acquisition planned

Multichannel Power Supply IPM Architecture UV Lamp (Calibration) Vacuum Air +V0 Multichannel Power Supply Vacuum Ions -V0 Electrons MCP (2x) Phosphor Screen Air

IPM Design 1: Beam 2: Camera 3: E-Field minimizing apreture Picture by T. Giacomini, GSI

Camera View

Sensivity measurement using UV Lamp

MCP Degredation Correction

Long Term Camera Degradation If the measurement software is closed the accumulated color values are saved Black is 0, white 255 This should give an indication of dead (white) pixels It is assumed that there is no beam picture any longer (HV off) Single points might deviate Replacement

Gaussian Fit Beam parameters are mainly described by the parameters of an Gaussian fit Gaussian fit not always correct Upper picture: oscillating beam (exp. Time 100 ms range) Lower P: Cooling

Problems Phosphor defects Unsymmetrical Effects

Problems Phosphor defects Camera defects Unsymmetrical effects Reason known, solution possible Camera defects Can be measured and mapped out Last GigE-cameras lasted ~6 years Unsymmetrical effects Occur not all the time No reflections Is beam-dependent (no beam, no effect) Charge-up effects? Solution up to now: cut picture (ROI)

ESS Version Plans for in-house version for ESS before 2015 Now in-kind contribution Idea for a system without MCPs Enhanced robustness in between cryogenic cavity modules Prove of principle tests done DESIREE experiment University of Stockholm Special thanks to C. Roose, ESS

Setup Particle Energy: 10, 20, 30, 40 keV Current: ~20 nA, ~0.5 nA Screens: a P47 phosphor screen, ITO conductive layer, emission wavelength = 420 nm a P47 phosphor screen, Al conductive layer, emission wavelength = 420 nm a YAG:Ce screen with conductive layer, emission wavelength = 550 nm and a CaF2:Eu with conductive layer, emission wavelength = 435 nm. Hamamatsu H7546 8x8 channel PMT Photo: Hamamatsu

Results

HESR (FAIR) plans Decrease the size of the E-field box Aperture HESR: 89 mm Aperture HEBT: 140 mm Idea to construct one system for both Technical design has just begun MCP/Phosphor screen module should be compatible Sizing issues 2 (2-plain) systems for HESR 10 systems for HEBT

Future Plans COSY: Major software upgrade planned FAIR: MCP-less IPM New control-PC should take over calculations, new software Publishing results over EPICS Possibility to integrate in CSS FAIR: Smaller version planned for FAIR 12 devices MCP-less IPM No actual plans, but open for collaboration COSY: Luminescence Profile Monitor 1 2-plain device planned for new low energy (30 MeV) beamline in 2019