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R.Giachino / M.Albert
Be/op 5 April 2015
LHC Machine check out
https://indico.cern.ch/category/6386/1v1
S 34
● S 56 RB.A56 Circuit QPS communication problem– Reset B16R5, the crate is saturated
● Piquet called In ● Needed access● Intervention in Pt5 finished. ● QPS in C16.R5 back to normal.
2
U_DIODE = -15 VU_MAG = -15 V
Preparing for TL tests
● TDI in IP2 and IP8 closed:– Left jaw parallel (LU and LD) to 8 mm, – Right jaw parallel (RU and RD) to 4.5 mm– LD to 3.6 mm, RD to 0.1 mm
● TL’s handshake
5
Extraction to TED
● Extraction to downstream TED. – The extraction failed when the SPS was on LHC frequency– Succeeds when the SPS was on local frequency.
● Beam extracted downstream TED’s
6
Problem fixed by Thomas
Machine check & Beam Permit Loop
● Opening vacuum valves with the sequence● Opening valves manually around kickers
7
Beam Permit Loop Closed
Synchronisation
● Synchronisation check ● Disable injection kicker● TCTPV4L2.B1 was too closed
8
Beam on TDI
Machine Preparation
● TI2 and TI8 TEDs back IN● Collimators set for threading
● VVGS.29528 closed for interlock propagation test● Interlock was correctly propagated to EXT1 BIC of SPS
10
LBDS MP tests
● LBDS machine protection tests
● LBDS commissioning test 5.1 for B1.● LBDS commissioning test 5.1 for B2.● LBDS commissioning test 4.2 for B1/B2.
11
N.Magnin & Jorg
Tentative plan
● Friday Sector 34 circuits operational
● Beam loop closed Thursday evening● LBDS –BIS machine protection tests ● Machine Cycle all sectors together● Beam to downstream TED ● Check synchronization LHC-Injectors chain● First beam not before Sunday morning
13
Plan
●For B1 & B2:
● Bring the beam to the TDI,● Open TDI and go to next point blocked by collimator,● Steer the trajectory,● Open collimator,● Repeat point by point until the beam makes one turn.● When one turn is established try to increase the number of turns
(better trajectory, move tunes etc...) until >= 40 turns.● Try to capture the beam with the RF.
14
Plan
● When both beams circulate, check out the key instrumentation, starting with orbit and tune.
● Improve the orbit correction, steer back the transfer lines ● Measure chromaticity and dispersion.● Try out the other instruments
●Over-night:● Continue the commissioning and testing.● Polarity checks of orbit correctors and tune trim circuits.
15
Tentative Plan
●Monday
● RF work: delays, loops etc● Continue BI commissioning, including timing.● Clean-up orbit.● First quick test of the orbit, tune and radial feedbacks.
●Evening/night ● Splashes ● Polarities continued
16