Download presentation
Presentation is loading. Please wait.
1
LHC e - cloud simulations C.Octavio Domínguez, Giovanni Rumolo, Frank Zimmermann 17 th January2011 - e - cloud simulations
2
2 Contents 1)LHC IR3: I.State of the art 2) LHC arc dipoles: I.Emittance scan (onset, build up & energy distribution) II.Intensity scan (build up & x-flux distribution) 17 th January2011 - e - cloud simulations
3
3 Contents 1)LHC IR3: I.State of the art 2) LHC arc dipoles: I.Emittance scan (onset, build up & energy distribution) II.Intensity scan (build up & x-flux distribution) 17 th January2011 - e - cloud simulations
4
4 LHC IR3 First idea Try to reproduce this plot, BUT 4 parameters: P, SEY, max and R
5
5 17 th January2011 - e - cloud simulations LHC IR3 – 8.85 s ~ Factor 6 ~ Factor 3 Memory effect
6
6 17 th January2011 - e - cloud simulations LHC IR3 – 8.85 s ~ Factor 1.1 No memory effect ??
7
7 17 th January2011 - e - cloud simulations LHC IR3
8
8 17 th January2011 - e - cloud simulations LHC IR3 – Energy distribution
9
9 17 th January2011 - e - cloud simulations LHC IR3 – Energy distribution
10
10 17 th January2011 - e - cloud simulations LHC IR3 – Work to do Look at 28.85 and 38.85 s Look at the flux (maybe related to the pressure rise) Make the study for individual batches of 12, 24 and 36 bunches …
11
11 Contents 1)LHC IR3: I.State of the art 2) LHC arc dipoles: I.Emittance scan (onset, build up & energy distribution) II.Intensity scan (build up & x-flux distribution) 17 th January2011 - e - cloud simulations
12
12 LHC arc dipoles - scan 17 th January2011 - e - cloud simulations Geometry: Parameters: N b = 1.1 · 10 11 ppb; B = 0.535 T (dipolar field) ; s z = 0.118 m e max = 230 eV ; R = 0.7; P=1nTorr Filling scheme: 1 batch (36 bunches) 22 mm 18 mm
13
13 17 th January2011 - e - cloud simulations LHC arc dipoles - scan e N ( m) SEY (onset/significative density) 1 1.9 / 2.3 (~0.5 10 11 ) - 2.4 (~3 10 11 ) 2 1.9 / 2.3 (~0.45 10 11 ) - 2.4 (~3 10 11 ) 3 1.9 / 2.4 (~ 10 11 ) 4 2.0 / 2.4 (~ 10 11 ) 10 2.0 / 2.4 (~ 10 11 )
14
14 17 th January2011 - e - cloud simulations LHC arc dipoles - scan Build up
15
15 17 th January2011 - e - cloud simulations LHC arc dipoles - scan Build up
16
16 17 th January2011 - e - cloud simulations LHC arc dipoles - scan Build up
17
17 17 th January2011 - e - cloud simulations LHC arc dipoles - scan Energy distribution
18
18 17 th January2011 - e - cloud simulations LHC arc dipoles - scan Energy distribution
19
19 17 th January2011 - e - cloud simulations LHC arc dipoles - scan Energy distribution
20
20 17 th January2011 - e - cloud simulations LHC arc dipoles - scan Energy distribution
21
21 Contents 1)LHC IR3: I.State of the art 2) LHC arc dipoles: I.Emittance scan (onset, build up & energy distribution) II.Intensity scan (build up & x-flux distribution) 17 th January2011 - e - cloud simulations
22
22 LHC arc dipoles - N b scan 17 th January2011 - e - cloud simulations Geometry: Parameters: N = 2.3 m; B = 0.535 T (dipolar field) ; s z = 0.118 m e max = 230 eV ; R = 0.7; P=1nTorr SEY=2.5 (above multipacting onset) Filling scheme: 1 batch (36 bunches) 22 mm 18 mm
23
23 17 th January2011 - e - cloud simulations LHC arc dipoles - N b scan Build up
24
24 17 th January2011 - e - cloud simulations LHC arc dipoles - N b scan Build up
25
25 17 th January2011 - e - cloud simulations LHC arc dipoles - N b scan x flux distribution
26
26 17 th January2011 - e - cloud simulations LHC arc dipoles - N b scan x flux distribution
27
27 17 th January2011 - e - cloud simulations LHC arc dipoles - N b scan x flux distribution
28
28 17 th January2011 - e - cloud simulations
29
29 17 th January2011 - e - cloud simulations
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.