Status of SPS Ionization Profile Monitor Mariusz Sapinski, CERN
BE/BI MSWG 2014.10.24
Slide 2
Outlook The system architecture Renovation Status Future
upgrades Expected performance 2014.10.242M. Sapinski, MSWG
Slide 3
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
Slide 4
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
Renovation optical systems and cameras 2014.10.246M. Sapinski,
MSWG
Slide 7
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
Slide 8
Renovation electric cage 2014.10.248M. Sapinski, MSWG
Slide 9
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
Slide 10
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
Slide 11
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
Slide 12
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
Slide 13
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
Slide 14
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)
Slide 15
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.
Slide 16
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
Slide 17
Spare slides 2014.10.2417M. Sapinski, MSWG
Slide 18
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)
Slide 19
LHC2 at 26 GeV 2014.10.2419M. Sapinski, MSWG WS: scan IN
Emittance (WS) = 1.05 m Beam size in IPM = 1.93 mm
Slide 20
SFTMD at injection 2014.10.2420M. Sapinski, MSWG WS: scan IN
Good agreement!
Slide 21
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
Slide 22
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
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.