Update on ILC ML Lattice Design Alexander Valishev, for the FNAL LET group FNAL AP Dept. Meeting...
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Transcript of Update on ILC ML Lattice Design Alexander Valishev, for the FNAL LET group FNAL AP Dept. Meeting...
![Page 1: Update on ILC ML Lattice Design Alexander Valishev, for the FNAL LET group FNAL AP Dept. Meeting March 7, 2007.](https://reader034.fdocuments.us/reader034/viewer/2022051412/5518a40d550346a61f8b49bc/html5/thumbnails/1.jpg)
Update on ILC ML Lattice Design
Alexander Valishev,for the FNAL LET group
FNAL
AP Dept. Meeting March 7, 2007
![Page 2: Update on ILC ML Lattice Design Alexander Valishev, for the FNAL LET group FNAL AP Dept. Meeting March 7, 2007.](https://reader034.fdocuments.us/reader034/viewer/2022051412/5518a40d550346a61f8b49bc/html5/thumbnails/2.jpg)
2APD meeting March 7, 07
ML Lattice design
Outline
• Basic layout• Curvature implementation• Matching• Summary and problems
![Page 3: Update on ILC ML Lattice Design Alexander Valishev, for the FNAL LET group FNAL AP Dept. Meeting March 7, 2007.](https://reader034.fdocuments.us/reader034/viewer/2022051412/5518a40d550346a61f8b49bc/html5/thumbnails/3.jpg)
3APD meeting March 7, 07
ML Lattice design
Lattice Design
• Defined by cryo segmentation• Versions of segmentation
» 8-8-8 scheme, May 31 2006» 9-8-9 scheme, Dec 28 2006
• Basic segmentations:
Main Linac
RF Unit
Cryogenic Unit
![Page 4: Update on ILC ML Lattice Design Alexander Valishev, for the FNAL LET group FNAL AP Dept. Meeting March 7, 2007.](https://reader034.fdocuments.us/reader034/viewer/2022051412/5518a40d550346a61f8b49bc/html5/thumbnails/4.jpg)
APD meeting March 7, 07
ML Lattice design
May 31 revision (v.3) 8-8-8
![Page 5: Update on ILC ML Lattice Design Alexander Valishev, for the FNAL LET group FNAL AP Dept. Meeting March 7, 2007.](https://reader034.fdocuments.us/reader034/viewer/2022051412/5518a40d550346a61f8b49bc/html5/thumbnails/5.jpg)
5APD meeting March 7, 07
ML Lattice design
Curvature Implementation
• Beam line geometry definition differs for MatLIAR/Lucretia and MAD.
• A method to have one set of decks and still be able to work with two codes was proposed by M.Woodley:» One common XSIF file, defining beam line, all common
elements, and ‘KINK’ elements at the ends of cryomodules.
» Two different files defining KINK elements to be used in MatLIAR and MAD. One of the files is called from the main file depending on the software used.
» Beam trajectory in both cases is changed by VKICK elements
• Another approach is to use vertical SBENDs» In this case one deck is compatible with both codes
![Page 6: Update on ILC ML Lattice Design Alexander Valishev, for the FNAL LET group FNAL AP Dept. Meeting March 7, 2007.](https://reader034.fdocuments.us/reader034/viewer/2022051412/5518a40d550346a61f8b49bc/html5/thumbnails/6.jpg)
6APD meeting March 7, 07
ML Lattice design
Curvature Implementation
• GKICK, Multipole
• SBEND
![Page 7: Update on ILC ML Lattice Design Alexander Valishev, for the FNAL LET group FNAL AP Dept. Meeting March 7, 2007.](https://reader034.fdocuments.us/reader034/viewer/2022051412/5518a40d550346a61f8b49bc/html5/thumbnails/7.jpg)
7APD meeting March 7, 07
ML Lattice design
Implementation of ‘KINKs’
• MatLIAR/Lucretia: Thin ‘dispersion-free kick’ GKICK, which pitches the coordinate system.
• MAD: Combination of» General thin multipole n=0, changes both
the beam trajectory and the coordinate system
» VKICK of the opposite sign
![Page 8: Update on ILC ML Lattice Design Alexander Valishev, for the FNAL LET group FNAL AP Dept. Meeting March 7, 2007.](https://reader034.fdocuments.us/reader034/viewer/2022051412/5518a40d550346a61f8b49bc/html5/thumbnails/8.jpg)
8APD meeting March 7, 07
ML Lattice design
ILC2006e (8-8-8) Lattice -functions
![Page 9: Update on ILC ML Lattice Design Alexander Valishev, for the FNAL LET group FNAL AP Dept. Meeting March 7, 2007.](https://reader034.fdocuments.us/reader034/viewer/2022051412/5518a40d550346a61f8b49bc/html5/thumbnails/9.jpg)
9APD meeting March 7, 07
ML Lattice design
ILC2006e Orbit
![Page 10: Update on ILC ML Lattice Design Alexander Valishev, for the FNAL LET group FNAL AP Dept. Meeting March 7, 2007.](https://reader034.fdocuments.us/reader034/viewer/2022051412/5518a40d550346a61f8b49bc/html5/thumbnails/10.jpg)
10APD meeting March 7, 07
ML Lattice design
ILC2006e Dispersion
![Page 11: Update on ILC ML Lattice Design Alexander Valishev, for the FNAL LET group FNAL AP Dept. Meeting March 7, 2007.](https://reader034.fdocuments.us/reader034/viewer/2022051412/5518a40d550346a61f8b49bc/html5/thumbnails/11.jpg)
11APD meeting March 7, 07
ML Lattice design
Emittance Preservation LIAR Simulation: CURVED LINAC: ILC BCD-Like LATTICE
Orb
it a
t th
e Y
CO
Rs
(m
)
Perfect Lattice - No misalignments
Zoom
No
rma
lize
d E
mit
tan
ce
(n
m)
Static Tuning: Dispersion Matched Steering (DMS) - Misalign the beamline components and perform the steering
Average of 50 machines
Straight
Curved
Co
rre
cte
d n
orm
ali
zed
em
itta
nc
e
(nm
)
Mean: 5.0 ± 0.4 nm
90%: 8.7 nm
Laser Straight
Mean: 5.3 ± 0.5 nm
90%: 9.5 nm
Curved
Distribution of emittance growth for 50 seeds
BPM index
BPM index
![Page 12: Update on ILC ML Lattice Design Alexander Valishev, for the FNAL LET group FNAL AP Dept. Meeting March 7, 2007.](https://reader034.fdocuments.us/reader034/viewer/2022051412/5518a40d550346a61f8b49bc/html5/thumbnails/12.jpg)
12APD meeting March 7, 07
ML Lattice design
Summary
• ML lattices based on two cryogenic layouts have been developed
• Two versions of ILC2006e (8-8-8) ML lattice (GKICK/MULT and SBEND) were studied» Both versions work well in Lucretia and show similar
emittance growth» It was decided at the Daresbury meeting in January
that only GKICK/MULT lattice will be supported
• Static alignment simulations show acceptable emittance growth in the curved ML lattice
• Dynamic simulations in progress
![Page 13: Update on ILC ML Lattice Design Alexander Valishev, for the FNAL LET group FNAL AP Dept. Meeting March 7, 2007.](https://reader034.fdocuments.us/reader034/viewer/2022051412/5518a40d550346a61f8b49bc/html5/thumbnails/13.jpg)
13APD meeting March 7, 07
ML Lattice design
Problems
• Create set of decks suitable for simulations of bunch propagation from RTML to the end
• Improve dispersion matching between curved and straight sections» The way it was implemented in ILC2006e
suggests large orbit kinks with angles of ~3e-4» At 250 GeV, this leads to energy losses of
100MeV and synchrotron radiation power of 4kW» One possible solution – make smooth transition
from curved to straight beam line.