ecloud simulations for the lhc arcs
DESCRIPTION
E-cloud Simulation Meeting. Ecloud simulations for the LHC arcs. Humberto Maury Cuna. October 28 th , 2011. Outline. A bug in ECLOUD code – XY distribution for: Field-free section Quadrupole Dipole Oscillations in quadrupole heat load simulations. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Ecloud simulations for the LHC arcs](https://reader035.vdocuments.us/reader035/viewer/2022062222/568150bb550346895dbed7fd/html5/thumbnails/1.jpg)
Ecloud simulations for the LHC arcs
Humberto Maury Cuna
E-cloud Simulation Meeting
October 28th, 2011
![Page 2: Ecloud simulations for the LHC arcs](https://reader035.vdocuments.us/reader035/viewer/2022062222/568150bb550346895dbed7fd/html5/thumbnails/2.jpg)
OutlineA bug in ECLOUD code – XY
distribution for:◦Field-free section◦Quadrupole◦Dipole
Oscillations in quadrupole heat load simulations.
![Page 3: Ecloud simulations for the LHC arcs](https://reader035.vdocuments.us/reader035/viewer/2022062222/568150bb550346895dbed7fd/html5/thumbnails/3.jpg)
Field-free region – 7 TeV – 1.2x1011 – 25 ns
![Page 4: Ecloud simulations for the LHC arcs](https://reader035.vdocuments.us/reader035/viewer/2022062222/568150bb550346895dbed7fd/html5/thumbnails/4.jpg)
Quadrupole – 7 TeV – 1.2x1011 – 25 ns
![Page 5: Ecloud simulations for the LHC arcs](https://reader035.vdocuments.us/reader035/viewer/2022062222/568150bb550346895dbed7fd/html5/thumbnails/5.jpg)
Dipole – 7 TeV – 1.2x1011 – 25 ns
![Page 6: Ecloud simulations for the LHC arcs](https://reader035.vdocuments.us/reader035/viewer/2022062222/568150bb550346895dbed7fd/html5/thumbnails/6.jpg)
Dipole – Gas ionization
B = 0.01 T 0.54 T
![Page 7: Ecloud simulations for the LHC arcs](https://reader035.vdocuments.us/reader035/viewer/2022062222/568150bb550346895dbed7fd/html5/thumbnails/7.jpg)
Oscillations in quadrupole Heat load simulationsSimulations parameters:
◦Macroparticles: 2500◦Time steps inter bunch gap: 3000◦Energy: 7 TeV◦Bunch spacing: 25 ns◦Reflectivity: 0.5◦Ibend=2
![Page 8: Ecloud simulations for the LHC arcs](https://reader035.vdocuments.us/reader035/viewer/2022062222/568150bb550346895dbed7fd/html5/thumbnails/8.jpg)
0.00E+00 5.00E+10 1.00E+11 1.50E+11 2.00E+11 2.50E+110.00E+00
2.00E+00
4.00E+00
6.00E+00
8.00E+00
1.00E+01
1.20E+01
1.40E+01Quadrupole - 7 TeV - 25 ns
y1p1y1p2y1p3y1p4y1p5y1p6y1p7
Nb
Heat
load (
W/m
)
![Page 9: Ecloud simulations for the LHC arcs](https://reader035.vdocuments.us/reader035/viewer/2022062222/568150bb550346895dbed7fd/html5/thumbnails/9.jpg)
0.00E+00 5.00E+10 1.00E+11 1.50E+11 2.00E+11 2.50E+11 3.00E+110.00E+00
2.00E+00
4.00E+00
6.00E+00
8.00E+00
1.00E+01
1.20E+01
1.40E+01
Quadrupole heat load - SEY = 1.7 - 7 TeV
nistep=3000
nistep=1500
Nb
Heat
load (
W/m
)
![Page 10: Ecloud simulations for the LHC arcs](https://reader035.vdocuments.us/reader035/viewer/2022062222/568150bb550346895dbed7fd/html5/thumbnails/10.jpg)
ResultsThe “bug” seems to affect only dipoles and just the photoemission case.
The quadrupoles heat load oscillations depends on the SEY and also the number of time steps.
![Page 11: Ecloud simulations for the LHC arcs](https://reader035.vdocuments.us/reader035/viewer/2022062222/568150bb550346895dbed7fd/html5/thumbnails/11.jpg)
Thank you for your attention
![Page 12: Ecloud simulations for the LHC arcs](https://reader035.vdocuments.us/reader035/viewer/2022062222/568150bb550346895dbed7fd/html5/thumbnails/12.jpg)
Quadrupole – ibend = 6