● Morning: First physics fill with 48 bunches per beam: – 20:30: Injection finished 4.5 10 12 protons per beam in 48 bunches; e x1 = 2.9 mm; e y1 = 2.9 mm; e x2 = 3.3 mm; e y2 = 3.5 mm; – 21:00: Start ramp; – 21:40: End ramp; – 22:20: Start Squeeze Initial luminosity: L = 6.65 10 30 cm -2 sec -1 ; – 23:30: Stable physics; L = 6.15 10 30 cm -2 sec -1 ; fitted average emittances for bunch current of N b = 9 10 10 : s = 4.05mm; with b * = 3.6m (average of three 1/b * measurement in IR5) Friday 20.8. 1 8:30 meeting
Friday 20.8. Morning: First physics fill with 48 bunches per beam: 20:30: Injection finished 4.5 10 12 protons per beam in 48 bunches ; e x1 = 2.9 m m; e y1 = 2.9 m m; e x2 = 3.3 m m; e y2 = 3.5 m m; 21:00: Start ramp; 21:40: End ramp; 22:20: Start Squeeze - PowerPoint PPT Presentation
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● Morning: First physics fill with 48 bunches per beam:– 20:30: Injection finished 4.5 1012 protons per beam in 48 bunches;
Initial luminosity: L = 6.65 1030 cm-2 sec-1;– 23:30: Stable physics; L = 6.15 1030 cm-2 sec-1;
fitted average emittances for bunch current of Nb = 9 1010: s = 4.05mm; with b* = 3.6m (average of three 1/b* measurement in
IR5)
integrated luminosity = 240 nb-1 after 16 hours;
Friday 20.8.
1 8:30 meeting
● 48 bunches in both beams: integrated Luminosity of more than 240 nb-1
Firday 19.8.
2 8:30 meeting
● 48 bunches in both beam: beginning of the fill.
Thursday 19.8.
3 8:30 meeting
● Beam 1 bunch distribution at end of fill:
Firday 19.8.
4 8:30 meeting
● Beam 1 bunch distribution at end of fill:
Firday 19.8.
5 8:30 meeting
giulia papotti (BE/OP/LHC)
03.08.2010
200 400 600 800 10000
5
10
15
20
25
30
time [min]
loss
es [
%]
fill 1295 - beam 1
200 400 600 800 10000
5
10
15
20
25
30
time [min]
loss
es [
%]
fill 1295 - beam 2
200 400 600 800 10005
6
7
8
9
10
11
time [min]in
tens
ity [
1e10
p+/
bunc
h]
fill 1295 - beam 1
put in collisions
stable beams
200 400 600 800 10005
6
7
8
9
10
11
time [min]
inte
nsity
[1e
10 p
+/bu
nch]
fill 1295 - beam 2
Fill 1295
• 16 hours of stable beams– first 48 + 48
IPs: 1 5 2 8 - 1 5 8 - 1 5 2 - 1 5 - 2 8 - 8
giulia papotti (BE/OP/LHC)
giulia papotti (BE/OP/LHC)
03.08.2010
Fill 1295
IPs: 1 5 2 8 - 1 5 8 - 1 5 2 - 1 5 - 2 8 - 8
0 1 2 30
5
10
15
20
25
30
number of collisions
loss
es 2
hrs
aft
er c
oll [
%]
fill 1295 - beam 1
0 1 2 30
5
10
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25
30
number of collisions
loss
es 2
hrs
aft
er c
oll [
%]
fill 1295 - beam 2
1 LR in 2 (33m) 1 LR in 2 (33m)
1 LR in 8 (33m) 1 LR in 8 (33m)
1 LR in 2 (22m)1 LR in 2 (22m)
no Long Range interactions
with Long Range
giulia papotti (BE/OP/LHC)
● Very clean dump by operator switch:
Firday 19.8.
8 8:30 meeting
● End of Fill studies:– Luminosity scans in all IPs (large scan in IP1);– Damper studies;– Orbit feedback test for radial loop correctio;– 16:15: Beam dump; very clean & without any unusual losses
Friday 20.8.
9 8:30 meeting
● Lumi scans in IR1:average beam emittances:
ex = 4.4mm ey = 4.9mm
growth of 10% to 20% over the fill!
Firday 19.8.
10 8:30 meeting
● Morning until noon:– Recovery from cryo problem in Pt6.
● Afternoon and over night:– New physics fill with 48 on 48 bunches.
● Sunday to Monday:– Physics Fills with 48 bunches per beam.
Saturday 21.8.
11 8:30 meeting
● Open Issues for next Technical Stop:– CMS cooling for central tracker.– Ion pumps in dump line MKB (B2 only 4 out of 8 pumps working; few days
intervention).– BLM racks (in buildings SR1 and SR5 and both at position BY02): would like to
correct the way the power cable for the multi-plug arrives inside the rack. – QPS boards: several boards had to switch from channel A to B.– Access team to replace oxydized connectors for PAD-PX24 (3 hours).– CV needs to replace a motorization of the water valve of the sector 56 (3h).– RCBH18.R7B2 – Miguel Cerqueira Bastos.