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Status of SPS Ionization Profile Monitor Mariusz Sapinski, CERN BE/BI MSWG 2014.10.24

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Outlook The system architecture Renovation Status Future upgrades Expected performance 2014.10.242M. Sapinski, MSWG

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System architecture (simplified) 2014.10.243M. Sapinski, MSWG beam EB Multi-Channel Plate Phosphor Prism Optical system View port CID camera (intensified) Thermo Scientific CID8712D1M-XD4 Video amplifier Frame grabber Patch panel Cam gain/gate control HV ctrl card Power supply Magnet control - standard S N

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Renovation 2012 Winter TS 2011/2012: MCPs exchanged (vacuum opened) Electronics (surface and tunnel) exchanged to the same as in LHC Optical systems and cameras exchanged to the same as in LHC 2014.10.244M. Sapinski, MSWG

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Renovation surface electronics 2014.10.245M. Sapinski, MSWG

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Renovation optical systems and cameras 2014.10.246M. Sapinski, MSWG

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Renovation LS1 Exchange of electric cage (the same as in LHC): Ceramic electrodes better for impedance Fully identical systems in LHC and SPS (spare parts, easier interventions in future) Some parts were almost broken and no spare parts available - and any new intervention (MCP exchange) could result in incapacitation of a monitor 2014.10.247M. Sapinski, MSWG

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Renovation electric cage 2014.10.248M. Sapinski, MSWG

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Renovation LS1 2014.10.249M. Sapinski, MSWG Change of magnet topology: Before two corrector magnets to close the orbit bump made by main detector magnet Separate PC Unsafe

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Scenario #5 - Two existing converters rated 125V/125A in a serial configuration (Master/slave) with two magnets in series, Current reference = variable di/dt (max voltage is used, no control of the current during ramp up), Max requested current = 50A, Total Load (magnet + cables) resistance @45C = 2.79 , Rise time = 0.517 second This configuration is relevant Proposed Hardware configuration 10 2013 tested with beam implemented during LS1

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Renovation LS1 2014.10.2411M. Sapinski, MSWG Front-End software Dedicated technical student HV control class moved to FESA3, tested, running Image class: restructured and moved to FESA 3 but still some errors, probably to be solved fast. Update of expert application

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Status 2014.10.2412M. Sapinski, MSWG During Run I detector suffered from beam-generated noise on video signal. After several iterations noise was reduced and first signals (on vertical monitor) were observed end of the Run 1. Now: beam (probably) seen in analog channel in BA5 but FE software image class not functional. Now: issues with communication (gain/gate) with one of the cameras TS next week

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Still to be done 2014.10.2413M. Sapinski, MSWG Improvements in image processing (digital filtering) New HV controller card prototypes produced, need to be programmed and testes, ready - beginning 2015. Lack of EGP-based calibration system for horizontal monitor: need to produce new vacuum chamber not planned, calibration can be done using beams during MD. Flanges in SPS still slightly different than in LHC, may be exchanged in the future. In far future: use technologies being developed for PS: Hybrid silicon pixel detector fast readout Compact magnet with build-in corrector and potentially stronger field. Nextmonths later LS2

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Expected performance 2014.10.2414M. Sapinski, MSWG Measurement of beam emittance in both planes with several Hz acquisition rate (tested: ~12 Hz) Will need beam-based MCP calibration every a few months (depending on usage) Beam space charge may affect measurement of vertical profile for small-emittance beams at high energy (and we are working on correction procedure)

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Conclusions 2014.10.2415M. Sapinski, MSWG 1.SPS IMP hardware and electronics completely renovated. 2.Magnet PC reconfigured now meeting Machine Protection requirements. 3.Updated FE software almost ready. 4.Will need some time for commissioning and calibration. 5.Potentially more work needed with proper signal processing. 6.Expected to be able to read images with a few Hz.

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Thank you for your attention and thanks to many people who worked on this project or helped in one way or another: Ana Guerrero, Bogna Blaszczyk, Dominik Vilsmeier, Joel Adam, Karel Cornelis, Jeremie Bauche, Gilles Le Godec, Pierre Thonet, Morad Hamani, Gerhard Schneider and others 2014.10.2416M. Sapinski, MSWG

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Spare slides 2014.10.2417M. Sapinski, MSWG

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Measurements on February 12th 2014.10.2418M. Sapinski, MSWG Only vertical IPM was working Signal seen before on LHCION, idea was to explore it SFTMD and LHC2 also measured! 40 scans with scanner 416V IPM was very stable, but not calibrated so the analysis is not tuned: no filtering on video, no tilt correction, etc. no camera gain control WS data: LoggingDB, IPM data: root files on VM Synchro WS-IPM: 5s (my guess)

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LHC2 at 26 GeV 2014.10.2419M. Sapinski, MSWG WS: scan IN Emittance (WS) = 1.05 m Beam size in IPM = 1.93 mm

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SFTMD at injection 2014.10.2420M. Sapinski, MSWG WS: scan IN Good agreement!

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LS1 improvements 2014.10.2421M. Sapinski, MSWG 1.Construction of new detectors, exactly the same as in LHC Ceramic electrodes Modern design 2.Exchange of cables (short ones), tunnel cable shielding, testing, camera communication 3.Change from current 2-corrector scheme to single corrector one: Tested with beam in February Powering scenario which assures cycling mode proposed by Gilles Le Godec 4.Studies ongoing to understand MCP issues 5.Synchronization with machine (bunch-by-bunch) safe operation

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System: HV cage + PS + control 2014.10.2422M. Sapinski, MSWG EGPin - 1800 V EGPout - 1900 V Cgrid - 2000 V MCPin +2000V MCPout +2600V Phosphor +5000V HVctrl PS VME ~ 180 m beam anti-SEM wires Field-shaping electrodes Accelerating potential

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2014.10.2423M. Sapinski, MSWG VME Negative electrode

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Hardware failures (other than already mentioned) 2014.10.2424M. Sapinski, MSWG HV ctrl card problem with compatibility with VME (linux CPU) 5 CID cameras stopped working, in most cases we suspect that intensifier reached MTTF (tbc by ThermoFischer). failures of MCPs conditioning effect for MCPs too high input electron current might kill MCP abrupt HV change might kill MCP (and dump the beam!) Killed MCP: creation a conducting channel through the plate: cannot set HV anymore, cannot amplify the signal.