Status Report on LHC Beam Instrumentation LHC Machine Advisory Committee 6 th December 2007 Rhodri...
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Transcript of Status Report on LHC Beam Instrumentation LHC Machine Advisory Committee 6 th December 2007 Rhodri...
Status Report onStatus Report onLHC Beam InstrumentationLHC Beam Instrumentation
LHC Machine Advisory Committee
6th December 2007
Rhodri Jones
on behalf of the
CERN Beam Instrumentation Group
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
OverviewOverview
● Status of BI Systems● Beam loss measurement
● Installation Status● Beam Test Results
● Orbit & trajectory measurement● Installation Status● Use of the system for aperture checks with the RF ball
● Transverse Beam Size Measurement● Rest Gas Ionisation Monitors● Wire Scanners
● US-LARP Contributions● Collision Rate Monitors (LBNL)● Schottky Monitors (FNAL)
● Advances on Other Systems
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
The LHC Beam Loss SystemThe LHC Beam Loss SystemRole of the BLM system:
1. Protect the LHC from damage
2. Dump the beam to avoid magnet quenches
3. Diagnostic tool to improve performance of LHC
Name Type Number Area of useMaskable with safe beam flag
Time resolution
BLMQI Ionisation Chamber ~3100 Arcs yes 1 turn
BLMEIBLMES
Ionisation ChamberSEM
~150~150
Collimation regions
no 1 turn
BLMEIBLMES
Ionisation ChamberSEM
~400~150
Critical aperture limits or positions
no 1 turn
BLM__ ACEM (phase II) ~10Primary collimators
No thresholds
bunch-by-bunch
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
LHC Beam Loss DetectorsLHC Beam Loss Detectors
● Design criteria: Signal speed and reliability
● Dynamic range (> 109) limited by leakage current through insulator ceramics (lower) and space charge saturation (upper)
Secondary Emission Monitor(SEM):
● Length 10 cm● P < 10-7 bar● ~ 30000 times smaller gain
Ionization chamber:● N2 gas filling at 100 mbar over-
pressure● Length 50 cm● Sensitive volume 1.5 l● Ion collection time 85 s
Both monitors:● Parallel electrodes
● (Al or Ti) separated by 0.5cm● Low pass filter at the HV input● Voltage 1.5 kV
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
BLM System Status BLM System Status ● Production
● Ionisation chambers (IC)● 4250 produced at IHEP & delivered to CERN● Relative gas gain verified at CERN-GIF (gamma irradiation facility) for 4000
● Secondary Emission Monitors (SEM)● 350 produced at IHEP & 250 tested so-far in proton beam at CERN
● Vacuum verified (< 5x10-5 bar)● If too high ionisation chamber & gives ~2300 times more gain
0 10 20 30 40 50-10
0
10
20
30
40
50
60
70
80
time [s]
blm-030.dat QSEM
/Qbeam
= 4.0806
cha
rge
[pC
]
QSEM
Qbeam
*Geant4
QSEM
corrected
0 1 2 3 4 5 6 70
1
2
3
4
5
6
7
8
9
10
SEM calibration in H4 20cm Cu target 300 GeV/c protons SEM/beam ratio Mean: 3.40 sigma: 0.92
QSEM
/Qbeam
Integrated charge of 4 SPS cycles
SEM Calibration
● Very good production quality achieved for both● Only 16 from 4000 ionisation chambers & 2 from 250 SEMs failed the tests
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
● Installation● Follows LHC schedule
● 66% of ionisation chambers installed● 29% of SEMs installed (collimation areas missing)
● Electronics installed in Sector 8–1
● BLM Testing● Complete BLM system tests in SPS – shots of 1013 protons on collimator
● High intensity & short duration simulated LHC transient beam impact● Tested the complete LHC BLM system: hardware & software
● Results ● Cross talk observed in multi-conductor cables carrying both ionisation & SEM
signals● Re-cabling required in all LSS to separate IC & SEM signals (done except 5L)
● Cross talk observed between different ionisation chamber channels● Low pass filter to reduce signal slope for straight section ICs (to be done)
● Next Tests● EMC with injection kicker magnets & availability of installed BLMs
BLM System Status BLM System Status
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
Status of Software Elements for the Status of Software Elements for the BLM SystemBLM System
● Tested:● Data
Concentrator● Change of
thresholds● Change of beam
energy● Transmission to
logging system● Triggered data
generation -40ms, 2ms data
● Post mortem ● XPOC● Collimation
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
Threshold Setting AccuracyThreshold Setting AccuracyHERA DUMP: M. Stockner (thesis)
Geant4
Geant4
Threshold setting accuracydepends mainly on● Secondary shower simulation● Quench level knowledge
Secondary Shower Simulation● Difficult to simulate far transverse
tails● Compared with HERA measurements
● Geant4 and FLUKA agree with each other within errors bars at 39 GeV and 920 GeV
● Discrepancy of factor ~2 between measurements and simulation
● Not unexpected from simulation uncertainties for far transverse tails
● Consequences for LHC: ● Geant4 (QGSP-BERT-HP) & FLUKA
qualified for threshold simulation ● Can expect systematic error for the
LHC simulation of 50%
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
Quench Level Simulations & Measurements Quench Level Simulations & Measurements
MQM magnets at 4.5 K
3700
3800
3900
4000
4100
4200
4300
4400
4500
4600
4700
25.00 30.00 35.00 40.00 45.00 50.00 55.00
P [mW/cm2]
I m
agn
et [
A]
MQM 627
MQM 677
MQMC 677
Ultimate current 4650 A
Nominal current 4310 A
-8
-6
-4
-2
0
2
4
6
8
30 35 40 45 50 55 60 65
P [mW/cm2]
DI m
agn
et [
%]
MQM 627
MQM 677
MQMC 677
Quench Level Knowledge● Network model (PSpice) used to
simulate thermodynamic behavior of LHC superconducting magnets in steady state
● Compared to measurements via quench heaters & inner coil heating
● Results obtained for MQM, MQY, MQ and MB magnets at 4.5K
● Measurements and simulation agree within 20%
● Qualified network model at 4.5K
● Quench limits simulated for beam induced energy deposition
● Power density deposition found to vary by up to a factor 2 compared to design value of 5 mWcm-3
% error between
measurement & simulation
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
LHC Beam Position Monitors – All InstalledLHC Beam Position Monitors – All Installed
Injection Lines: 100 Warm, Button BPMs(Buttons Recuperated from LEP)
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
LHC Beam Position Monitors – All InstalledLHC Beam Position Monitors – All Installed
912 Button Electrode BPMs (24mm)for the
Main Arcs & Dispersion Suppressors
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
LHC Beam Position Monitors – All InstalledLHC Beam Position Monitors – All Installed
24 Directional Couplers52 Enlarged Button& 8 Trigger BPMsInteraction Regions
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
LHC Beam Position Monitors – All InstalledLHC Beam Position Monitors – All Installed
36 WarmBPMs -
34mm ButtonElectrodes
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
LHC Beam Position Monitors – All InstalledLHC Beam Position Monitors – All Installed
54 Special BPMs for Tune & Chromaticity,Transverse Damper & RF, Beam Dump
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
LHC Beam Position Monitors – All InstalledLHC Beam Position Monitors – All Installed
All 1182 BPMs for the LHCand its Transfer Lines are now installed
(Sector 7-8 BPMs have survived firstthermal cycle without incident)
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
Status of BPM Acquisition SystemStatus of BPM Acquisition System
● Series Production of all components nearing completion● Wide Band Time Normaliser
(40MHz position measurement)● All 2282 front-end cards required received● All 2288 front-end cards required received● Delivery of all spares to be completed by end 2007
● Digital Acquisition Board(DAB64x - TRIUMF)
● Standard for BPM, BLM, Fast BCT, Wire Scanners,Luminosity & Q measurement
● All 1300 BPM type modules received● All 500 BLM type modules received
● Reception Testing● 2 automated test benches constructed and manned by external personnel● Used for adjustment and calibration of all Wide Band Time Normaliser Cards● Beam simulator allows position & intensity linearity measurement for all cards● All data stored in MTF & linked to serial number chip located on each card● Over 70% of the cards have been tested so far
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
Status of BPM Acquisition SystemStatus of BPM Acquisition System
● Installation● Tunnel installation and
hardware commissioning has been completed in arcs of
● Sector 4L● Sector 4-5● Sector 5-6● Sector 6-7 (underway)● Sector 7-8● Sector 8-1
● Infrastructure● Nearly all fibre-optic, coaxial cable and WorldFIP control links in place
● LSS7 & LSS3 are equipped with radiation hard fibres (Fujikura, Japan)● Tests have shown that radiation induced attenuation in this fibre for light at
1310 nm is 5 dB/km after 1 MGy● this attenuation is reached in the standard Ge-doped fibre after only 500 Gy
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
Aperture Restriction Localisation using the RF Mole Aperture Restriction Localisation using the RF Mole (Ping-Pong Ball) and the LHC BPM System(Ping-Pong Ball) and the LHC BPM System
AB/BI, TS/IC, AT/VACAB/BI, TS/IC, AT/VAC● Aim
● To find a method to quickly check for obstacles in the beam pipe at warm
● Principle● Air flow to move a
lightweight ball that contains an emitter able to trigger the LHC Beam Position Monitor (BPM) system
● Test location● The whole continuous
cryostat in each sector (~2.6km)
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
RF RF emitteremitter
● Polycarbonate shell● Diameter
● 34mm exterior● 30mm interior
● Total weight● ~15 g (ball 8g)
● RF characteristics● 40MHz resonant circuit
● Generates 20V between copper electrodes
● Battery powered● Over 2hr lifetime
● Capacitive coupling to BPM electrodes
● 1V ~5mV● -45db Coupling
● BPM trigger threshold at ~3mV
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
Air FilterAnemometer
First Test (13/09)First Test (13/09)V2 line from Q11.L8 to Q26.L8V2 line from Q11.L8 to Q26.L8
Q11.L8Pump at Q26.L8Switched on once the cap was in place
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
BPM Ball TrackingBPM Ball TrackingBPM position
Beam aperture
Time stamp (in second)
Final BPM acquisition system
Interleaved BPMs (odd/even in arc) on separate front-end CPUs
Missing BPM trigger in Q13 ?
Last BPM trigger in Q22
Ball stopped between Q22 and Q23
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
Localisation by BPM Reflectometry (AB/RF)Localisation by BPM Reflectometry (AB/RF)● 4-8GHz signal coupled into the beampipe using BPM & associated cables
● Reflected signals analysed for several polarisations● No clear signal of the ball location when stopped was obtained by BPM
reflectometry comparing the V1 and V2 lines● Test performed from Q22.L8 and Q24.L8 (ball expected to be at Q23.L8)
● However once the ball was sucked back away from the obstruction a very clear signal of the original ball location was observed
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
Damaged PIM in 23L8Damaged PIM in 23L8
● Nothing expected at this location● Re-check of the X-rays showed that 2 fingers were indeed
bent into the vacuum chamber
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
8-7 Complete Sector Test (V2 line)8-7 Complete Sector Test (V2 line)
RF Mole Results:
● Allows aperture check in the arc
● Localisation to 50m possible using BPMs
● Now systematically carried out on all sectors before cooldown:
● 5-6, 7-8 & 8-1so far all OK
● Test of BPM system in final configuration
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
Measuring Beam SizeMeasuring Beam Size
● Beam Profile Measurements in the LHC● Workhorses
● Synchrotron light monitor● Wire scanners for cross calibration
● For injection & matching● OTR screens
● For ions● Rest Gas Ionisation Monitor (BGI)
● Also used as back-up for SR monitor
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
Rest Gas Ionisation Monitors (BGI)Rest Gas Ionisation Monitors (BGI)● Beam 1 and Beam 2 monitors were installed in early 2007● Wrong programming of the bake-out led to both horizontal and vertical
beam 2 monitors being cooked at 350C instead of baked-out at 200 C● All parts of these monitors suffered
● The brazing material of the window (Pb/Ag alloy) completely melted● The ensuing vacuum leak sucked the melted material into the vacuum chamber,
polluting the chamber and detector● The anti-reflective coating of the quartz widow and one prism were destroyed● The Multi Channel Plate (detector) and Electron Generator Array (calibration source)
were severely damaged● Aluminium pieces were plasticised
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
Rest Gas Ionisation Monitors (BGI)Rest Gas Ionisation Monitors (BGI)● Reconstruction began immediately salvaging as much as possible and using
spare components
● Both tanks were chemically cleaned and could be re-used
● The quartz windows were re-polished
● All aluminium pieced were re-manufactured
● Two completely new detectors were built
● Installation of these “new” monitors was completed a few weeks ago
● The bake-out is now also complete
● Tests are underway to verify the correct functioning of the detector
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
Wire ScannersWire ScannersOpen Issues from previous LHC MACs● Where to place the PMT detectors?● When does the wire break?● Do downstream magnets quench during a scan?
● Where to place the PMT detectors● Signal proportional to energy deposited - a lot of signal for nominal intensity● Signal level at ~6m changes by less than 50% with energy
Energy per interacting proton Energy per interacting proton
Mariusz SapinskiMariusz Sapinski
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
Wire Scanners – When does the wire break?Wire Scanners – When does the wire break?● Simulations corroborated by SPS measurements show that a 30m carbon wire
scanned at 1ms-1 will survive ( T < 4000K ) with:● 25% of nominal LHC beam at injection energy● 7% of nominal LHC beam at top energy (a function of beam size not energy)
● Thermionic current plays crucial role as cooling process for temperatures above 3000 K
● RF-heating does not significantly affect wire temperature
● heat transfer plays minimal role as cooling mechanism
● eventual use of carbon nanotubes will not improve performance
● The carbon work function and wire emissivity are poorly known but are important parameters of the model.
Mariusz Sapinski
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
Wire Scanners – Do we quench during a Scan?Wire Scanners – Do we quench during a Scan?Simulations show that:● Number of events with large energy deposition is higher in Q5 than D4● The wire scanner can work to between 1 to 6 x 1012 protons at 7 TeV
● Less than one nominal 72 bunch PS batch● Main uncertainty due to simulation of small number of interactions in small volume
What can be done to increase this margin?● Scan faster – can gain up to factor 2● Reduce the wire diameter
● Reduces the number of interactions while reduction of signal strength no issue for PMT● Add shielding
● Difficult as source of energy is from particles hitting the beam pipe close to & within Q5● inclusion of Schottky monitors (smaller aperture) in front of Q5 in the simulation had little effect
Mariusz Sapinski
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
US-LARP ContributionsUS-LARP ContributionsCollision Rate Monitoring (LBNL)Collision Rate Monitoring (LBNL)
● Detector Status● 1 detector at CERN● 2 detectors undergoing final testing at LBL (HV, Pressure....)● 1 undergoing repair for leaky cable due at the end of December
● Installation Schedule● Installation of dummy chamber successfully tested during 2007● Final installation of 3 detectors foreseen in Jan/Feb 2007 and one in March
● Electronics Status● Final prototype of front-end electronics is working well & final package expected by January 2007
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
LHC TAN Collision Rate Monitor (LBNL)LHC TAN Collision Rate Monitor (LBNL)Results from 2007 Tests at RHICResults from 2007 Tests at RHIC
RHIC ZDC
LBL Lumi
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
US-LARP ContributionsUS-LARP ContributionsSchottky Monitoring (FNAL)Schottky Monitoring (FNAL)
● Schottky Travelling Wave Structures● All 4 tanks completed and installed in early 2007● Bake-out completed
● small Ar leak from internal cable on 1 module identified no VAC issue at this time● Travelling wave structure response tested by FNAL team in May 2007
● Electronics Status● All Front-end electronics installed & tested by FNAL team in May 2007● Digital acquisition will be the same as for standard LHC tune measurement● Front-end control currently being implemented by FNAL
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
US-LARP ContributionsUS-LARP ContributionsSchottky Monitoring (FNAL)Schottky Monitoring (FNAL)
● Tevatron Tests● Tevatron Schottky monitors fitted with LHC style front-end electronics● Results very encouraging
● big improvement in S/N over current Tevatron system● Triple down-mixing to baseband
● Reduction in instantaneous dynamic range with revolution line outside pass band of final 15kHz crystal filter
● Use of improved low phase noise local oscillators
Old System - first LOResults
New System - first LOResults
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
● Test of all instruments with beam in TI2 successful● Screens● BPMs & BLMs● BCT● Software
Advances on Other SystemsAdvances on Other Systems
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
● Beam current transformers installed & baked-out in the LHC ring and the Dump Lines
Advances on Other SystemsAdvances on Other Systems
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
● Fast camera for synchrotron light monitor (BSRT) successfully tested in the SPS● used for SPS injection matching studies● employed 4 times faster framing rate (& associated SW)
Vertical
Horizontal
Raw Data Corrected Data
Advances on Other SystemsAdvances on Other Systems
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
● Continuous chromaticity measurement via RF modulation using LHC PLL system tested in SPS● Dp/p ~2x10-5 DQ ~1x10-4 for Q=6● Radial change of only 40m in SPS● Easily tracked by PLL at modulation frequency of 0.5Hz
● Resolution of better than 1x10-5 obtained for the tune measurement
Advances on Other SystemsAdvances on Other Systems
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
● All 4 Cadmium Telluride collision rate monitors (for IP2 (Alice) & IP8 (LHCb) delivered by CEA-LETI● Successfully tested with beam in the SPS North Area● Full electronics acquisition chain developed & tested
Advances on Other SystemsAdvances on Other Systems
Rhodri Jones – CERN Beam Instrumentation GroupRhodri Jones – CERN Beam Instrumentation Group LHC Beam Instrumentation – MAC2007 LHC Beam Instrumentation – MAC2007
SummarySummary● Over 60% of both large distributed systems (BPM/BLM) installed
● Complete slice of BLM system successfully tested in SPS● Complete BPM system tested during aperture verifications with RF mole
● Issues resolved during the year● Rest gas ionisation monitor accident during bake-out
● Huge effort by BI team responsible has enabled all monitors to be re-installed● Outstanding wire-scanner issues are resolved
● Main limitation at top energy will be quench limit of Q5 magnet
● US-LARP Deliverables● Use of RHIC as test bed for tune, coupling & chromaticity control very useful● Despite problems delivery of LBNL luminosity monitors still on schedule● Schottky collaboration with FNAL has been very effective
● Outlook for LHC commissioning● All necessary instrumentation hardware for the start-up is now in place● Most electronics is under test enabling the initial software to be written & tested● The functionality will evolve through the commissioning phases