horizontal main injector at 8 and 150 gev in recent...
TRANSCRIPT
Looking at Horizontal Main Injector proton emittances at 8 and 150 GeV in
recent stores
Vaia Papadimitriou
April 1, 2009
Stores 6850‐6944 (Mar. 1‐Mar. 30, 2009)
store number
Intensities
9000
9500
10000
10500
11000
11500
12000
12500
13000
13500
14000
14500
15000
6840 6850 6860 6870 6880 6890 6900 6910 6920 6930 6940 6950
# 47 p at MI, 8 GeV (1E09)
# 48 p at MI, 150 GeV after coal. (1E09)
# 49 SBD p at Tev injection (1E09)
Stores 6850‐6944 (Mar. 1‐Mar. 30, 2009)
store number
Emittances
9
10
11
12
13
14
15
16
17
18
19
20
21
6840 6850 6860 6870 6880 6890 6900 6910 6920 6930 6940 6950
# 75 p H emitt, MI 8 GeV (pi‐mm‐mrad)
# 76 p H emitt, MI 150 GeV (pi‐mm‐mrad)
# 77 p H emitt Tev 150, before ramp (pi‐mm‐mrad)
Stores 6850‐6944 (Mar. 1‐Mar. 30, 2009)
store number
Hor. Brightness(Intensity/Emittance)
500
550
600
650
700
750
800
850
900
950
1000
6840 6850 6860 6870 6880 6890 6900 6910 6920 6930 6940 6950
H brightness, MI 8 GeV
H brightness, MI 150 GeV
H brightness, TeV 150 GeV
Stores 6850‐6944 (Mar. 1‐Mar. 30, 2009)
store number
Long. Emittances
1
1.2
1.4
1.6
1.8
2
2.2
2.4
2.6
2.8
3
3.2
3.4
3.6
3.8
4
6840 6850 6860 6870 6880 6890 6900 6910 6920 6930 6940 6950
# 200 Alt. P Longitudinal Emittance MI 8 GeV
# 204 Alt. P Longitudinal Emittance MI 150 GeV
In the next pages we look at horizontal emittances as well as centroids, sigmas, amplitudes and χ’s of the Flying Wire profile fits at Main Injector 8 and 150 GeV, comparing performance in mid February and late March.
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0 18 36 54 72 90 108 126 144 162 180 198 216
I:WHIP02[72]
I:WHIP02[73]
I:WHIP04[108]
I:WHIP04[109]
Stores 6792‐6829 (Feb. 10‐Feb. 23, 2009)amplitude of fit
(1st pass expectedto have bigger amp.)
8 GeV
Transfer number (18 per store with two bunches each)
6829Why 1st and 2nd bunch have systematicallydifferent amplitudes?
Is the integrator reset to 0before the 2nd bunch?J. Zagel will check.
0
0.02
0.04
0.06
0.08
0.1
0.12
0.14
0.16
0.18
0 18 36 54 72 90 108 126 144
I:WHIP02[72]
I:WHIP02[73]
I:WHIP04[108]
I:WHIP04[109]
Stores 6931‐6944 (Mar. 26‐Mar. 30, 2009)
amplitude of fit
(1st pass expectedto have bigger amp.)
8 GeV
Transfer number (18 per store with two bunches each)
6944
After the integrator hold time was reducedfrom 200 ns to 100 ns.Significantly smaller difference now between1st and 2nd batch. Both amplitudes are now small though.
13
13.5
14
14.5
15
15.5
16
16.5
17
17.5
18
18.5
19
0 18 36 54 72 90 108 126 144 162 180 198 216
I:WHEP02[144]
I:WHEP02[145]
I:WHEP04[216]
I:WHEP04[217]
Stores 6792‐6829 (Feb. 10‐Feb. 23, 2009)
Transfer number (18 per store with two bunches each)
Emittances8 GeV
02 is 1st pass04 is 2nd pass
6829
Bigger emitt. difference between 1st and 2nd pass
13
13.5
14
14.5
15
15.5
16
16.5
17
17.5
18
18.5
19
19.5
20
0 18 36 54 72 90 108 126 144
I:WHEP02[144]
I:WHEP02[145]
I:WHEP04[216]
I:WHEP04[217]
Stores 6931‐6944 (Mar. 26‐Mar. 30, 2009)
Transfer number (18 per store with two bunches each)
Emittances8 GeV
02 is 1st pass04 is 2nd pass
6944
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
4
0 18 36 54 72 90 108 126 144 162 180 198 216
I:WHSP02[72]
I:WHSP02[73]
I:WHSP04[108]
I:WHSP04[109]
Stores 6792‐6829 (Feb. 10‐Feb. 23, 2009)Sigmas of fit
8 GeV
Transfer number (18 per store with two bunches each)
6829
3.4
3.5
3.6
3.7
3.8
3.9
4
4.1
4.2
4.3
0 18 36 54 72 90 108 126 144
I:WHSP02[72]
I:WHSP02[73]
I:WHSP04[108]
I:WHSP04[109]
Stores 6931‐6944 (Mar. 26‐Mar. 30, 2009)
Sigmas of fit8 GeV
Transfer number (18 per store with two bunches each)
6944
Stores 6792‐6829 (Feb. 10‐Feb. 23, 2009)Centroids
8 GeV
‐3
‐2.5
‐2
‐1.5
‐1
‐0.5
0 18 36 54 72 90 108 126 144 162 180 198 216
I:WHCP02[72]
I:WHCP02[73]
I:WHCP04[108]
I:WHCP04[109]
Transfer number (18 per store with two bunches each)
6829
02 is 1st pass04 is 2nd passBigger difference in centroids between 1st and 2nd pass.
Why the flipping between 1st and 2nd pass?(Not always correlated with odd or even number of corrresponding pbar transfers)
‐3
‐2.5
‐2
‐1.5
‐1
‐0.5
0 18 36 54 72 90 108 126 144
I:WHCP02[72]
I:WHCP02[73]
I:WHCP04[108]
I:WHCP04[109]
Stores 6931‐6944 (Mar. 26‐Mar. 30, 2009)
Centroids8 GeV
Transfer number (18 per store with two bunches each)
6944
02 is 1st pass04 is 2nd pass
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
2.2
2.4
2.6
2.8
0 18 36 54 72 90 108 126 144 162 180 198 216
I:WHFP02[72]
I:WHFP02[73]
I:WHFP04[108]
I:WHFP04[109]
Stores 6792‐6829 (Feb. 10‐Feb. 23, 2009)χ2’s of fit8 GeV
Transfer number (18 per store with two bunches each)
6829
The χ2’s are quitedifferent for the 1st and 2nd bunch/batch.
0
0.02
0.04
0.06
0.08
0.1
0.12
0.14
0.16
0.18
0 18 36 54 72 90 108 126 144
I:WHFP02[72]
I:WHFP02[73]
I:WHFP04[108]
I:WHFP04[109]
Stores 6931‐6944 (Mar. 26‐Mar. 30, 2009)
χ2’s of fit8 GeV
Transfer number (18 per store with two bunches each)
6944
0.2
0.25
0.3
0.35
0.4
0.45
0.5
0.55
0.6
0 18 36 54 72 90 108 126 144 162 180 198 216
I:WHIP03[146]
I:WHIP03[147]
I:WHIP05[182]
I:WHIP05[183]
Stores 6792‐6829 (Feb. 10‐Feb. 23, 2009)amplitude of fit
(1st pass expectedto have bigger amp)
150 GeV
Transfer number (18 per store with two bunches each)
6829 Why 1st and 2nd bunch have systematicallydifferent amplitudes?
Is the integrator reset to 0before the 2nd bunch?
0.02
0.04
0.06
0.08
0.1
0.12
0.14
0.16
0.18
0.2
0 20 40 60 80 100 120 140
I:WHIP03[146]
I:WHIP03[147]
I:WHIP05[182]
I:WHIP05[183]
Stores 6931‐6944 (Mar. 1‐Mar. 30, 2009)
amplitude of fit
(1st pass expectedto have bigger amp)
150 GeV
Transfer number (18 per store with two bunches each)
6944
13
13.5
14
14.5
15
15.5
16
0 18 36 54 72 90 108 126 144 162 180 198 216
I:WHEP03[290]
I:WHEP03[291]
I:WHEP05[362]
I:WHEP05[363]
Stores 6792‐6829 (Feb. 10‐Feb. 23, 2009)Emittances150 GeV
03 is 1st pass05 is 2nd pass
Transfer number (18 per store with two bunches each)
6829
12
12.5
13
13.5
14
14.5
15
15.5
16
16.5
17
17.5
18
0 18 36 54 72 90 108 126 144
I:WHEP03[290]
I:WHEP03[291]
I:WHEP05[362]
I:WHEP05[363]
Stores 6931‐6944 (Mar. 1‐Mar. 30, 2009)Emittances150 GeV
03 is 1st pass05 is 2nd pass
Transfer number (18 per store with two bunches each)
6944
Stores 6792‐6829 (Feb. 10‐Feb. 23, 2009)Centroids
150 GeV
‐1.4
‐1.3
‐1.2
‐1.1
‐1
0 18 36 54 72 90 108 126 144 162 180 198 216
I:WHCP03[146]
I:WHCP03[147]
I:WHCP05[182]
I:WHCP05[183]
Transfer number (18 per store with two bunches each)
6829
No difference here between 1st and 2nd pass
‐1.28
‐1.26
‐1.24
‐1.22
‐1.2
‐1.18
‐1.16
‐1.14
‐1.12
‐1.1
‐1.08
0 18 36 54 72 90 108 126 144
I:WHCP03[146]
I:WHCP03[147]
I:WHCP05[182]
I:WHCP05[183]
Stores 6931‐6944(Mar. 1‐Mar. 30, 2009)Centroids
150 GeV
Transfer number (18 per store with two bunches each)
6944
No difference here between 1st and 2nd pass
Conclusions
The fit amplitudes which were significantly different between the 1st and 2nd proton batch at both 8 and 150 GeV are much closer after the integrator hold time reduction on March 3 and additional adjustments on March 20th. The amplitudes are much smaller now though than they used to be.
The sigmas, emittances and centroids have been exhibiting similar differences between the 1st and 2nd
batch in the February and March comparisons. The χ2
differences at 8 GeV for the fits of the 1st and 2nd batch have been now improved.