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

Cryo

● Cryo S34 conditions back at 2:00 pm● All points ok

3

Cryo Maintain 78

Machine Precycle

● Precycle all sectors first time !! ● Machine at injection

4

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

Synchronisation

● TCTPV.4L2.B1 at parking position

9

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

Preparation BI

● BBQ and BFSU Energies are now all reported correctly

12

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

Beams on the downstream TED’s

17