BEAM POSITION MONITORS BPM FOR MYRRHA SLHi PP7

BEAM POSITION MONITORS (BPM) FOR MYRRHA SLHi. PP-7 – ORSAY – 9 th June 2017 1

BPM FOR MYRRHA • Outline • • MYRRHA Context Specifications for BPM system Prototype timeline 2

MYRRHA CONTEXT Multi-purpose h. Ybrid Research Reactor for High-tech Applications SPOKE 352 MHz Double SPOKE 352 MHz Elliptic 704 MHz k eff ~ 0. 95 Fuel : MOX Target : Eutectic Pb-Bi Reactor : -Subcritical (65 -100 MWth) -Critical (100 MWth) Goals: - To build a hybrid reactor demonstrator for transmuting radiotoxic waste, (ADS). - To product Radio Isotopes to medicine - For fundamental research 3

MYRRHA CONTEXT CW RF with pulsed beam 4

MYRRHA CONTEXT Extreme reliability Level Highly reliable diagnostics No false alarms on beam position and phase Performant BPM systems 5

BPM SPECIFICATIONS Beam Energy Current Frequency Repetition rate Commissioning : 17 Me. V-100 Me. V : 100µA-4 m. A : 176, 105 MHz : 1 Hz to 250 Hz : Pulsed with duty cycle =1% min to CW BPM constraints : BPM diameter : fixed BPM housing : fixed BPM outputs : Position precision : +/-100µm over 10 mm radius range Phase precision : +/-0. 5 deg over 10 mm radius range BPM interfaces : Machine Protection System MPS, LLRF, … 6

MAIN BPM TYPES I R V=R. I « Resistive" " Capacitive " SP 2, IPHI I 1 1/n. I 1 PRAE " Magnetic " I 2 1/n. I 2 Most of proton accelerators use " Capacitive " BPMs. Easy to realize 7

POSITION/PHASE MEASUREMENT Electrode H Y axis Electrode G Electrode D X axis Electrode B 8

MECHANICAL DESIGN Goals: Robust design, maximize output signal Robustness and precision are achieved using ceramic spacers: each electrode has 5 supports Electrode Output signal over the beam energy range [17 Me. V, 100 Me. V] is maximized by optimizing electrodes length. Expected output dynamic range [-52 d. Bm; -12 d. Bm] 9

MECHANICAL REALIZATION Feed through Steps 1. Characterization of feed throughs : electrical isolation, capacitance, impulse response 2. Choice of the feed through to match inside a BPM : minimum difference between feed throughs responses 3. Verification of the BPM BLOC 4. Verification of the whole BPM 5. Characterization of the BPM in order to measure: 1. BPM sensitivity 2. BPM electrical center 3. δx, δy (slide 8) BPM BLOC BPM test bench 10

ACQUISITION SYSTEM Solution 1: industrial Libera single pass H Direct Digital conversion of the outputs and reference signals Solution 2: Custom Example: SP 2 BARC module Conversion of output signals into baseband, before processing 11

PROTOTYPE TIMELINE MYRRHA Research and Transmutation Endeavour (MYRTE) : The goal of MYRTE, a H 2020 european project is to perform research to support the development of the MYRRHA facility during 4 years (may 2015 - may 2019) with a main topic : the Injector demonstration. WP 2 : Accelerator R&D for ADS/MYRRHA WP 2. 4 : Beam diagnostics development Procurement of 2 BPMs under WP 2, 4 Prototype Design Electronics Specifications Mechanical realization Electronics realization Qualification Commissioning on MYRTE : Done : expected fall 2017 : expected 1 st quarter 2018 : expected 3 rd quarter 2018 12

THANKS FOR YOUR ATTENTION SLHi. PP-7 – ORSAY – 9 th June 2017 13