comparing main injector flying wire proton emittancesat 8...
TRANSCRIPT
Comparing Main Injector Flying Wire proton emittances at 8 and 150 GeV in
recent stores (after store 6792) with stores before multibatch operation started.
Looking at horizontal emittances since the vertical MI wire is broken. We started having lower than expected initial
luminosities from store 6737 and on.
Vaia Papadimitriou
March 4, 2009
Trying to find out if the proton transverse emittances from the Booster and Main Injector at 8/150 GeV look different after store 6737 than before. Are they smaller, bigger, do they have more tails, etc. Since we are scraping at 8 GeV at MI, is it possible that the scraping now has different effects than before because the emittances look different?
9000
9500
10000
10500
11000
11500
12000
12500
13000
13500
14000
14500
15000
6780 6790 6800 6810 6820 6830 6840 6850 6860 6870
# 47 p at MI, 8 GeV (1E09)
# 48 p at MI, 150 GeV after coal. (1E09)
# 49 SBD p at Tev injection (1E09)
Stores 6792‐6862 (Feb. 10‐Mar. 4, 2009)
store number
Intensities
Feb. 28
11
11.5
12
12.5
13
13.5
14
14.5
15
15.5
16
16.5
17
17.5
18
6790 6800 6810 6820 6830 6840 6850 6860 6870
# 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 6792‐6862 (Feb. 10‐Mar. 4, 2009)
store number
Emittances
Feb. 28
700
720
740
760
780
800
820
840
860
880
900
920
940
960
980
1000
6780 6790 6800 6810 6820 6830 6840 6850 6860 6870
H brightness MI 8
H brightness MI 150
H brighness TeV 150
Stores 6792‐6862 (Feb. 10‐Mar. 4, 2009)
store number
Brightness(Intensity/Emittance)
Feb. 28
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. In one page we show results for one of these quantities for single batch operation before store 6737, and in the next results for multibatch operation after the MI 8 GeV emittances were fixed (store 6792).
Stores 6715‐6722 (Jan. 9‐Jan. 12, 2009)
14.5
15
15.5
16
16.5
17
17.5
0 36 72 108 144 180
I:WHEP02[144]
I:WHEP04[216]
Transfer number (36 per store)
Emittances8 GeV
02 is 1st pass04 is 2nd pass
6722 6715
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
‐2.3
‐2.2
‐2.1
‐2
‐1.9
‐1.8
‐1.7
‐1.6
‐1.5
‐1.4
0 36 72 108 144 180
I:WHCP02[72]
I:WHCP04[108]
Stores 6715‐6722 (Jan. 9‐Jan. 12, 2009)
Transfer number (36 per store)
Centroids8 GeV
6722
02 is 1st pass04 is 2nd pass
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)
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
0 36 72 108 144 180
I:WHFP02[72]
I:WHFP04[108]
Stores 6715‐6722 (Jan. 9‐Jan. 12, 2009)
Transfer number (36 per store)
χ2’s of fit8 GeV6722
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.
0.7
0.75
0.8
0.85
0.9
0.95
0 36 72 108 144 180
I:WHIP02[72]
I:WHIP04[108]
Stores 6715‐6722 (Jan. 9‐Jan. 12, 2009)
Transfer number (36 per store)
amplitude of fit
(1st pass expectedto have bigger amp.)
8 GeV6722
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.
3.55
3.6
3.65
3.7
3.75
3.8
3.85
3.9
0 36 72 108 144 180
I:WHSP02[72]
I:WHSP04[108]
Stores 6715‐6722 (Jan. 9‐Jan. 12, 2009)
Transfer number (36 per store)
Sigmas of fit8 GeV
6722
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
Store 6825, 1st injection
Store 6825, 2nd injection
Store 6825, 9th injection
12.5
13
13.5
14
14.5
15
15.5
16
0 36 72 108 144 180
I:WHEP03[289]
I:WHEP05[361]
Stores 6715‐6722 (Jan. 9‐Jan. 12, 2009)
Transfer number (36 per store)
Emittances150 GeV
03 is 1st pass05 is 2nd pass
6722
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
Stores 6715‐6722 (Jan. 9‐Jan. 12, 2009)
Transfer number (36 per store)
Centroids150 GeV
‐1.34
‐1.32
‐1.3
‐1.28
‐1.26
‐1.24
‐1.22
0 36 72 108 144 180
I:WHCP03[145]
I:WHCP05[181]
6722
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
Stores 6715‐6722 (Jan. 9‐Jan. 12, 2009)
Transfer number (36 per store)
χ2’s of fit150 GeV
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
0 36 72 108 144 180
I:WHFP03[145]
I:WHFP05[181]
6722
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0.5
0 18 36 54 72 90 108 126 144 162 180 198 216
I:WHFP03[146]
I:WHFP03[147]
I:WHFP05[182]
I:WHFP05[183]
Stores 6792‐6829 (Feb. 10‐Feb. 23, 2009)χ2’s of fit150 GeV
Transfer number (18 per store with two bunches each)
6829
Stores 6715‐6722 (Jan. 9‐Jan. 12, 2009)
Transfer number (36 per store)
amplitude of fit
(1st pass expectedto have bigger amp)
150 GeV
0.7
0.75
0.8
0.85
0.9
0.95
0 36 72 108 144 180
I:WHIP03[145]
I:WHIP05[181]
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?
Stores 6715‐6722 (Jan. 9‐Jan. 12, 2009)
Transfer number (36 per store)
Sigmas of fit150 GeV
0.82
0.83
0.84
0.85
0.86
0.87
0.88
0.89
0.9
0.91
0 36 72 108 144 180
I:WHSP03[145]
I:WHSP05[181]
Stores 6792‐6829 (Feb. 10‐Feb. 23, 2009)Sigmas of fit
150 GeV
0.83
0.84
0.85
0.86
0.87
0.88
0.89
0.9
0.91
0.92
0 18 36 54 72 90 108 126 144 162 180 198 216
I:WHSP03[146]
I:WHSP03[147]
I:WHSP05[182]
I:WHSP05[183]
Transfer number (18 per store with two bunches each)
6829
Conclusions
The MI 8 GeV proton intensities were gradually decreasing in the period Feb. 10 - Feb. 23 but they appear to be constant between Feb. 23 and Mar. 4, 2009. The 8 GeV proton emittances, averages of two batches and two passes, had a decreasing slope in the above time periods but the 8 GeV brightness remained constant.
The MI 150 and TeV 150 proton emittances started becoming smaller after Feb 23 (except from the very last store) and the corresponding beams became brighter.
The study revealed several interesting and unexpected features in the emittance measurements, especially during proton multibatch operation.
Conclusions
For example, the fit amplitudes were significantly different between the 1st and 2nd proton batch at both 8 and 150 GeV and J. Zagel found out that this was due to the fact that the integrator was not resetting to 0 after the 1st batch. An amplitude plot is shown at next page using two stores after the integrator hold time reduction on March 3. There is certainly an improvement after the fix.
Sigmas, emittances, centroids have been exhibiting bigger differences than before between the 1st and 2nd
wire pass at 8 GeV. There have been as well χ2
differences for the fits of the 1st and 2nd batch. We will monitor these features carefully in the stores
after the integrator hold time adjustment.
0
0.02
0.04
0.06
0.08
0.1
0.12
0.14
0.16
0.18
0.2
0 18 36
I:WHIP02[72]
I:WHIP02[73]
I:WHIP04[108]
I:WHIP04[109]
Stores 6856 and 6862 (Mar. 3 and 4, 2009)
amplitude of fit8 GeV
Transfer number (18 per store with two bunches each)
6862
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.Will keep watching this with more statistics.