Week 47

 

Machine coordinators Oliver Bruning and Jorg Wenninger

Slides shown at meetings

 

Day

Date

Beam

No beam

%

Friday

20-Nov

5

0

 

Saturday

21-Nov

15

9

 

Sunday

22-Nov

8

16

 

Week 47

Beam/Nobeam

28

25

53

Started with beam just after 18.00 Friday 

Beam 1

      18.50 TDI out and beam1 to IR3 (after some problems with BLM signals)

      19.00 beam through CMS

     beam1 through to IP6 quench in S56 (cell A12L6)

     Provoked by trajectory correction. Understood.

      19.55 Starting again injection of Beam1

     corrected beam to IP6, 7, 8, 1

      20.40 Beam 1 around and makes 2 turns

     Working on tune measurement, orbit, dump and RF

     Beam makes several hundred turns (not captured)

      Integers 64 59, fractional around .3 (Qv trimmed up .1)

      20.50 Beam 1 on beam dump at point 6

      21.50 Beam 1 captured

Beam 2

      22.15 Switching to Beam2

      22.20 Beam dump due to beam losses on TDI

      23.10 Start threading Beam2

     Round to 7 6 5 2 1

      23.40 First Turn Beam2

     Working on tune measurement, orbit, dump and RF

     Beam makes several hundred turns (not captured)

      Integers 64 59, fractional around .3 (Qv trimmed up .05)

      24.10 Beam 2 captured

Saturday 21st November

Pre-cycle magnets, pick up the pieces, access

Beam 1 again from 16.00

RF fine tuning

BI on tune, orbit and more

Circulate and not dump

Beam stays an hour (I=0.9I0), Lifetime 10h

From 19.00

RF finished for now

Dispersion and Chromaticity

Kick response (with circulating beam 1) overnight

Sunday 22nd November

Pre-cycle magnets, pick up the pieces, access

19.00 Vacuum problem in LINAC (pump power supply)

Switch to beam dump tracking tests

Test ramps with all elements (collimators)

Beam 2 again from 24.00 (03.00), circulate and dump

RF phase adjustments

Tune orbit coupling chromaticity measurement / adjust

Significant chromaticity trims needed (-10 both planes)

Coupling also worse than for beam 1

Splash events for ATLAS done

Interlock tertiaries in 1 (other 3 IP already done)

Circulate and not dump

Lifetime about 3 hours

RF phase lock not on