Advancements in Beam Dynamics and Simulation at John Adams Institute

Beam dynamics and simulation
Stewart T Boogert
John Adams Institute at Royal Holloway
Talk introduction
Research highlights
Wakefield measurement at ATF2
Helped achieve 65 nm beam size
Beam delivery simulation (BDSIM)
BDSIM geant 4 based simulation
BDSIM CLIC post collision line
CERN fellow L. Deacon
Proposed work for CLIC2
Develop model BDSIM model for CLIC
Collimator (and other structure wake-fields)
 2 beam tuning
IBIC : Beam Instrumentation at ATF2
(S. T. Boogert for ATF collab.)
17/09/2024
2
CLIC1 funding
17/09/2024
IBIC : Beam Instrumentation at ATF2 (S. T.
Boogert for ATF collab.)
3
ATF2 optics
Energy scaled
Raimondi-Seryi FFS
optics
Focus vertical size 37nm
at 
interaction point
Local chromaticity
correction
Relies on design
dispersion in FF
Preserve low emittance
from ATF ring (12
pm.rad)
Compact ~ 38 m
IBIC : Beam Instrumentation at ATF2
(S. T. Boogert for ATF collab.)
17/09/2024
4
ATF2
Tuning of ATF2
Help develop tuning algorithms at ATF2
Strong integration of diagnostics (see wakefield measurements)
Pushed ATF2 optics
Compton diagnostics essential (Shintake monitor)
IBIC : Beam Instrumentation at ATF2
(S. T. Boogert for ATF collab.)
17/09/2024
5
CBPM : Orbit kick response
IBIC : Beam Instrumentation at ATF2
(S. T. Boogert for ATF collab.)
17/09/2024
6
CBPM : Dispersion measurement
Vary beam energy in ATF damping ring by a small shift in
the RF frequency
Record response in stripline and CBPM systems
Online comparison with optics model (FFS based on dispersion)
 
17/09/2024
IBIC : Beam Instrumentation at ATF2 (S. T.
Boogert for ATF collab.)
7
CBPM : Wakefield measurement
Goal: measure wakefield from cavity BPM
Using movable setup with 1 or 2 reference cavities
Looking at downstream orbit change
Setup was used to compensate wakes from other locations
Crucial for reaching small beam size
IBIC : Beam Instrumentation at ATF2
(S. T. Boogert for ATF collab.)
17/09/2024
8
CBPM : Wakefield simulation
Geometrical wake fields computed numerically
with GdfidL ( http://www.gdfidl.de) and ACE3P
Electromagnetic fields calculator in any 3D-
structure
Finite element method
All higher modes included (up to cut-off
frequency)
The beam is represented as a line charge
traveling along the z-axis with optional offsets
in x and y, Gaussian distribution in z
Good agreement with different methods
Non-linear for large offsets
IBIC : Beam Instrumentation at ATF2
(S. T. Boogert for ATF collab.)
17/09/2024
9
CBPM : Wakefield measurement example
Wakefield kick will change the beam orbit
slightly
Experiment is ideally placed as many high
resolution cavity BPMs both upstream and
downstream of the setup
Procedure:
Take all upstream cavity BPM readings
All BPM readings averaged subtracted
Find contribution between those BPM
readings and downstream cavity BPM
readings
Subtract orbit per pulse (by SVD matrix
inversion)
Remaining correlation with setup
movement will give wakefield kick
Orbit and shape follows simulation well
Some discrepancy in absolute size compared to
simulation (calculation + tracking).
IBIC : Beam Instrumentation at ATF2
(S. T. Boogert for ATF collab.)
17/09/2024
10
BDSIM (Geant 4 + particle tracking)
Project of G. Blair
Taken over by S. Boogert, J.
Snuverink and L. Nevay
Improved
Base code
Conversion from MAD8, MADX
Interfaces to PLACET
Geometry description
Work recently to implement
LHC
CLIC/ILC significantly easier
17/09/2024
IBIC : Beam Instrumentation at ATF2 (S. T.
Boogert for ATF collab.)
11
CLIC dump line (L. Deacon)
17/09/2024
IBIC : Beam Instrumentation at ATF2 (S. T.
Boogert for ATF collab.)
12
Future program
Background studies for CLIC using PLACET/BDSIM
Collimator background generation
Compton signal backgrounds, emittance measurement
system, energy spectrometers, in RTML, linacs and BDS
Wakefield simulation
Collimator wakefields
Effect of wakes on low emittance transport
Two beam tuning
17/09/2024
IBIC : Beam Instrumentation at ATF2 (S. T.
Boogert for ATF collab.)
13
Deliverables
2013 (December): Complete BDSIM simulation of CLIC
collimation
2014 (April): Integrate wakefield simulations for CLIC
BPMs and other structures in PLACET
2015 (April): Complete BDSIM simulation of CLIC beam
delivery and two beam system
2016 (April): Integrate collimator wakefield and other
possible wakes, other diagnostic structures
2016 (April): Paper on backgrounds in CLIC
2016 (April): Paper on CLIC tuning, including effects of
wakefields.
17/09/2024
IBIC : Beam Instrumentation at ATF2 (S. T.
Boogert for ATF collab.)
14
New funding request
17/09/2024
IBIC : Beam Instrumentation at ATF2 (S. T.
Boogert for ATF collab.)
15
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Explore the latest research highlights in beam dynamics and simulation conducted by Stewart T. Boogert at the John Adams Institute in collaboration with Royal Holloway. Learn about the groundbreaking work in wakefield measurement, achieving a beam size of 65 nm, development of beam delivery simulation (BDSIM), and much more. Discover the contributions to CLIC2 and the essential role of beam instrumentation at ATF2, including tuning algorithms and diagnostics integration. Dive into the detailed studies on optics, tuning, orbit kick response, dispersion measurement, and wakefield measurement using movable setups. Witness the impactful advancements driving innovation in particle accelerator technology.


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  1. Beam dynamics and simulation Stewart T Boogert John Adams Institute at Royal Holloway

  2. Talk introduction Research highlights Wakefield measurement at ATF2 Helped achieve 65 nm beam size Beam delivery simulation (BDSIM) BDSIM geant 4 based simulation BDSIM CLIC post collision line CERN fellow L. Deacon Proposed work for CLIC2 Develop model BDSIM model for CLIC Collimator (and other structure wake-fields) 2 beam tuning IBIC : Beam Instrumentation at ATF2 (S. T. Boogert for ATF collab.) 17/09/2024 2

  3. CLIC1 funding RHUL CERN Academic (Grahame Blair) 3.6 / 1.8 0 / 0 Academic (Stewart Boogert) 0 / 3 0 / 0 Academic (Andrei Seryi) 7.2 / 7.2 0 / 0 PDRA (Jochem Snuverink) 0 / 0 18 / 21 EUCARD - ASTeC 4.8 / 4.8? 15.6 / 16.8 18 / 21 0 / 0 TOTAL Travel 6 / 5 k Material 0 / 0 k IBIC : Beam Instrumentation at ATF2 (S. T. Boogert for ATF collab.) 17/09/2024 3

  4. ATF2 optics Energy scaled Raimondi-Seryi FFS optics Focus vertical size 37nm at interaction point Local chromaticity correction Relies on design dispersion in FF Preserve low emittance from ATF ring (12 pm.rad) Compact ~ 38 m IBIC : Beam Instrumentation at ATF2 (S. T. Boogert for ATF collab.) 17/09/2024 4

  5. ATF2 Tuning of ATF2 Help develop tuning algorithms at ATF2 Strong integration of diagnostics (see wakefield measurements) Pushed ATF2 optics Compton diagnostics essential (Shintake monitor) IBIC : Beam Instrumentation at ATF2 (S. T. Boogert for ATF collab.) 17/09/2024 5

  6. CBPM : Orbit kick response IBIC : Beam Instrumentation at ATF2 (S. T. Boogert for ATF collab.) 17/09/2024 6

  7. CBPM : Dispersion measurement Vary beam energy in ATF damping ring by a small shift in the RF frequency Record response in stripline and CBPM systems Online comparison with optics model (FFS based on dispersion) IBIC : Beam Instrumentation at ATF2 (S. T. Boogert for ATF collab.) 17/09/2024 7

  8. CBPM : Wakefield measurement Goal: measure wakefield from cavity BPM Using movable setup with 1 or 2 reference cavities Looking at downstream orbit change Setup was used to compensate wakes from other locations Crucial for reaching small beam size IBIC : Beam Instrumentation at ATF2 (S. T. Boogert for ATF collab.) 17/09/2024 8

  9. CBPM : Wakefield simulation Geometrical wake fields computed numerically with GdfidL ( http://www.gdfidl.de) and ACE3P Electromagnetic fields calculator in any 3D- structure Finite element method All higher modes included (up to cut-off frequency) The beam is represented as a line charge traveling along the z-axis with optional offsets in x and y, Gaussian distribution in z Good agreement with different methods Non-linear for large offsets IBIC : Beam Instrumentation at ATF2 (S. T. Boogert for ATF collab.) 17/09/2024 9

  10. CBPM : Wakefield measurement example Wakefield kick will change the beam orbit slightly Experiment is ideally placed as many high resolution cavity BPMs both upstream and downstream of the setup Procedure: Take all upstream cavity BPM readings All BPM readings averaged subtracted Find contribution between those BPM readings and downstream cavity BPM readings Subtract orbit per pulse (by SVD matrix inversion) Remaining correlation with setup movement will give wakefield kick Orbit and shape follows simulation well Some discrepancy in absolute size compared to simulation (calculation + tracking). IBIC : Beam Instrumentation at ATF2 (S. T. Boogert for ATF collab.) 17/09/2024 10

  11. BDSIM (Geant 4 + particle tracking) Project of G. Blair Taken over by S. Boogert, J. Snuverink and L. Nevay Improved Base code Conversion from MAD8, MADX Interfaces to PLACET Geometry description Work recently to implement LHC CLIC/ILC significantly easier IBIC : Beam Instrumentation at ATF2 (S. T. Boogert for ATF collab.) 17/09/2024 11

  12. CLIC dump line (L. Deacon) Simulation Simulation Simulation Magnet 1a and 1b Main dump (water shown) with e-m shower Screenshot showing the entire post- collision line with an electron track in red Tunnel included but not shown IP Main dump (water) Magnet Beam pipe Concrete around main dump Beam losses with new layout Intermediate dump Post dump - concrete Simulation L. Deacon, L. Gatignon, ECFA Linear C ollider Workshop 2013 Beam losses in new layout (top) are small, less than ~100 W/m CDR baseline design (bottom): ~kW/m Intermediate dump (aperture shown) Thursday 30th May 2013 16 Thursday 30th May 2013 L. Deacon, L. Gatignon, ECFA Linear C ollider Workshop 2013 18 Main dump Thursday 30th May 2013 L. Deacon, L. Gatignon, ECFA Linear C ollider Workshop 2013 15 IBIC : Beam Instrumentation at ATF2 (S. T. Boogert for ATF collab.) 17/09/2024 Thursday 30th May 2013 losses 12 L. Deacon, L. Gatignon, ECFA Linear C ollider Workshop 2013 17 Thursday 30th May 2013 L. Deacon, L. Gatignon, ECFA Linear C ollider Workshop 2013 19

  13. Future program Background studies for CLIC using PLACET/BDSIM Collimator background generation Compton signal backgrounds, emittance measurement system, energy spectrometers, in RTML, linacs and BDS Wakefield simulation Collimator wakefields Effect of wakes on low emittance transport Two beam tuning IBIC : Beam Instrumentation at ATF2 (S. T. Boogert for ATF collab.) 17/09/2024 13

  14. Deliverables 2013 (December): Complete BDSIM simulation of CLIC collimation 2014 (April): Integrate wakefield simulations for CLIC BPMs and other structures in PLACET 2015 (April): Complete BDSIM simulation of CLIC beam delivery and two beam system 2016 (April): Integrate collimator wakefield and other possible wakes, other diagnostic structures 2016 (April): Paper on backgrounds in CLIC 2016 (April): Paper on CLIC tuning, including effects of wakefields. IBIC : Beam Instrumentation at ATF2 (S. T. Boogert for ATF collab.) 17/09/2024 14

  15. New funding request RHUL CERN Total Academic (Stewart Boogert) 6 pm 0 6 pm PDRA (Jochem Snuverink) 18 pm 18 pm 36 pm Travel 3 k 15 k 18 k Material 0 k 0 k 0 k IBIC : Beam Instrumentation at ATF2 (S. T. Boogert for ATF collab.) 17/09/2024 15

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