General News since PDR (Jan. 31st 2017) Wednesday 18th July 2018 P. Abbon, F. Belloni, F. Benedetti, G. Coulloux, F. Gougnaud, C. Lahonde-Hamdoun, P. Le Bourlout, Y. Mariette, J. Marroncle, J.P. Mols, V. Nadot, L. Scola C. Thomas (ESS project leader) 18/07/2018 Introduction - WM after Iphi Beam test

Introduction - WM after Iphi Beam test NPM for cold Linac 5 NPMs Schedule 1.6 AIK 7.3 1 3 = 5 (IPMX + IPMY) 18/07/2018 Introduction - WM after Iphi Beam test

NPM: Non intrusive Profile Monitor 2 types of NPM will be used at ESS IPM: Ionization PM FPM: Fluorescence PM E = OFF E = ON Ionization Fluorescence Cross-section + - Signal1) at 90 MeV 1500 1 Space Charge effect Design complexity ESS location cold part hot part (PRes. Gas≈10-9 mbar) (PRes. Gas≈10-6 mbar) 1) due to electric field 2) calculation done by Cyrille Thomas 18/07/2018 Introduction - WM after Iphi Beam test

IPM: Ionization Profile Monitor 2 types of IPM Read-outs “strips” conductive strips (constant width and “Gaussian” widths) w/o MCP (MicroChannel Plate) Faster system (LPC Caen) = signal integrator (0 to 3pC or 12pC) “optic” pMCP=MCP with phosphorescent screen Optic=1 lens CCD camera aperture for ions or electrons pMCP HV connection (cooper) CF200 flange SMA optical connector for “UV” light IPM cage with degraders (MCP) + Strips pMCP+optic+CCD 18/07/2018 Introduction - WM after Iphi Beam test

Introduction - WM after Iphi Beam test PDR reminder 18/07/2018 Introduction - WM after Iphi Beam test

Introduction - WM after Iphi Beam test Our proposition at PDR Read-out propositions for Profile measurements Conductive strips with/without MCP (MicroChannel Plate) pMCP + optics + CCD TimePix3  silicon pixelated detector (see J. Storey et al., IBIC 2017) Read-out for comparison 2 viewports for FPM 1 viewport with 3 scintillating screens with actuator  not used, too much background light…  not useful, saturation (break one at low intensity) IPHI Started with 2 pMCPs (Photonis & Hamamatsu) + constant strips plate  but Photonis pMCP broken “…under different lighting you may well have overlooked it. It is unlikely that cracking happens spontaneously under vacuum…” Serge Duarte Pinto from Photonis later one, replaced by “Gaussian” strips read-out 18/07/2018 Introduction - WM after Iphi Beam test

PDR relevant decisions (1) PDR: January 31st 2017 GoNoGo  ok Profile measurement must be done using ions (ionization by-products) Prototype tests should be reduced, or more concentrate TimePix3 (Silicon pixelated detector) really interesting, but too short time for delivery date “allowed” to investigate the ion detection feasibility 2 Read-Outs to be investigated conductive strips with/without MCP MCP with phosphorescent screen (COTS) Test beam Iphi (Irfu Saclay: proton 3 MeV, Imax=100 mA, pulsed mode) enough for validation Radiative background either calculation either on similar accelerator facility  Linac 4 Space charge simulation MCP ageing  still on schedule  simulation improved on longitudinal direction 18/07/2018 Introduction - WM after Iphi Beam test

PDR relevant decisions (2) Comparison WS / IPM MCP ageing Electric field simulation Cables  see preliminary extrapolation to ESS  new proposition  re-done from scratch!  contact already taken with Edward 18/07/2018 Introduction - WM after Iphi Beam test

Introduction - WM after Iphi Beam test IPHI beam tests 18/07/2018 Introduction - WM after Iphi Beam test

Introduction - WM after Iphi Beam test Proton beam E=3 MeV Intensity from 0.5 to 100 mA Duty cycle: 100% Note: pulsed mode 120µs (1 Hz) [60µs – 140µs] 18/07/2018 Introduction - WM after Iphi Beam test

IPHI: test bench on deviated line 18/07/2018 Introduction - WM after Iphi Beam test

IPHI: test bench on deviated line 18/07/2018 Introduction - WM after Iphi Beam test

Introduction - WM after Iphi Beam test Design/test bench the 3 IPMs Actuator with 3 scintillating screens 18/07/2018 Introduction - WM after Iphi Beam test

Introduction - WM after Iphi Beam test Test bench at IPHI aperture for ions or electrons pMCP HV connection (cooper) CF200 flange SMA optical connector for “UV” light NPM cage with degraders details of p-MCP connection 18/07/2018 Introduction - WM after Iphi Beam test

Life is a long, but a quiet river… Delays Component deliveries with important delays Most of then were postponed by few weeks, even months wrt the delivery date the worst: last MCP received on January 4th 2018 (ordered on 29/6/17) Vacuum: Problem with a leakage vacuum detector Late flanges delivery with the viewports (strips, optic, HV connectors…) Etc. No time to test in laboratory MCPs, just an overlook on CCD cameras, HVs, Faster (strips)… Installation on IPHI (Feb. 13th 2018) Kind of IPHI commissioning: working for the first time with an inner diagnostics. Starting data taking completely blind, but a FC, 2 ACCTs upstream and downstream the RFQ and BPMs not connected Problem with HVs (sparking) impossibility to work with Photonis pMCP, we gave up in mid March, send it back to Photonis and recovered it July 11th 2018  finally no beam test with a 2nd pMCP! 18/07/2018 Introduction - WM after Iphi Beam test

Life is a long, but a quiet river… MCP current consumption sometimes weird  no amplification Faster system: no trigger before April 6th fine beam tuning to determine workable beam conditions first genuine profile on March 1st Reproducibility: not so obvious Huge background Profiles were shifting, then drifting back like electric charge loading of IPM structure  lot of doubts, and… finally, BPM were connected showing correlations with IPMs Many attempts for background shielding  not really successful Material delivery delays, Vacuum problems, broken pMCP… postponed the assembly of the test bench in our laboratory, avoiding to test systems before installation on IPHI. Then, we were not ready when arriving at IPHI, which was not well “commissioned”… All these events implied waste of time before achieving a first profile measurement… and explain partly why we are here today! ion March 1st 18/07/2018 Introduction - WM after Iphi Beam test

Introduction - WM after Iphi Beam test among problems… Functioning point March 8th 9:15 HV only on IPM_2  bad profiles as shown on left bottom, but nice vertical beam deviation correlation) 9:25 HV on IPM_2 and IPM_1 (300 V)  background swept (right bottom) +10 A (high) 0 A (centre) -10 A (bottom) Ibeam=60 mA - IPM2 = 9 kV - MCP = 600 V - Phosphorus = 3500 V 9:15 9:25 Photonis pMCP broken 18/07/2018 Introduction - WM after Iphi Beam test

Introduction - WM after Iphi Beam test Working meeting ESS site visit this morning with Cyrille This afternoon 13:30 General news since PDR (Feb. 2017), Jacques (15’+5’) 13:50 Iphi test results using Strip read-out, Francesca (25’+15’) 14:30 Iphi test results using pMCP + CCD camera read-out, Florian (25’+15’) 15:10 Coffee break 15:30 Toward CDR: plans and perspective, Jacques (25’+15’) 16:10 concluding remarks, Cyrille (20’+10’) 16:40 first general discussions, all (20’) 17:00 Adjourn Tomorrow morning 09:00 – 11:00 closed session, committee In the meanwhile from NPM group, meeting from 8:30 to 11:00 08:30 – 10:00 meeting with vacuum group. 10:00 – 11:00 meeting with Accelerator physics group. 11:00 – 11:30 wrap-up with NPM group, Andreas/Thom (20’+10’) 11:45 Lunch Tomorrow afternoon 13:30 – 15:00 meeting with ICS group.   15:00 – 16:00 meeting with BI group. 16:15 back to the airport! 18/07/2018 Introduction - WM after Iphi Beam test