1. Study of Beam Losses and Collimation in JLEIC
Hannah Cooper, Vasiliy Morozov, Todd Satogata

2. Outline Motivation for Studies Process summary Sixtrack File Overview
BeamLossPattern

3. Why Study Beam Loss? Lost particles can damage machine elements
Can create backgrounds in detectors
Can create high radiation areas
Super conducting magnets can quench
Can design more effective collimation systems
Extend lifetime of warm magnets

4. (particle trajectories)
Process Summary
MAD-X
fc.2/fort.2
(Lattice)
fort.3
(commands)
Database
(collimator info)
SixTrack
tracks2.dat
(particle trajectories)

5. Process continued tracks2.dat Survey File Aperture File
(aperture offsets)
Aperture File
BeamLossPattern
LP_output.s
(particle loss location
1 m resolution)
LPI_output.s
(particle loss location
10 cm resolution)

6. SixTrack Particle tracking code developed at CERN
It has been extended with Collimation module to track a large number of halo particles and model their interaction with collimators
Element by element tracking
Tracks the full six–dimensional phase space including synchrotron oscillations in a symplectic manner.
MAD-X can automatically generate input lattice for SixTrack
Contact with collimator causes random scattering

7. fort.3 Number of forward turns Number of packs of particles
Logical flag reads opening of collimators from database
Distribution Setting
Sigma size for collimator
Sigma size for distribution
Database file

8. Number of Unique Collimators
Database
Number of Unique Collimators
Capitalized Name
Lowercase Name
Collimator Opening
Collimator Material
Collimator Length
Collimator Angle
Collimator Offset
Design Beta x
Design Beta y

9. Horizontal collimator
Verticle collimator

10. Particle Distribution After Passing Through One Collimator
Initial Particle Distribution

11. Collision Optics Before Slicing
Collision Optics After Slicing

12. BeamLossPattern Calculates location of beam loss
Resolution of 10 cm
Interpolates trajectories between lattice elements
Separate from SixTrack to speed up simulation time
From BeamLossPattern User Manuel

13. BeamLossMap example (Collimating Horizontally)

14. BeamLossMap example (Collimating Vertically)

15. References
Tracking Code for Collimation Studies. (2012, September 11). Retrieved July 18, 2018, from collimation-project/code-tracking-2012.php
Redaelli, S. (2012, April 5). BeamLossPattern program for LHC collimation studies. Retrieved from project.web.cern.ch/lhc-collimation-project/BeamLossPattern.htm