Integrating solenoid field maps in PLACET Yngve Inntjore Levinsen - - PowerPoint PPT Presentation

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Integrating solenoid field maps in PLACET Yngve Inntjore Levinsen - - PowerPoint PPT Presentation

Mar 27, 2024 137 likes •321 views

Integrating solenoid field maps in PLACET Yngve Inntjore Levinsen Barbara Dalena Rogelio Toms Garcia CERN 11. of May, 2012 Introduction Solenoid field maps in ASCII input format Integrate with lattice and track using symplectic integrator

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SLIDE 1

Integrating solenoid field maps in PLACET

Yngve Inntjore Levinsen Barbara Dalena Rogelio Tomás Garcia

CERN

  • 11. of May, 2012
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SLIDE 2

Introduction

Solenoid field maps in ASCII input format Integrate with lattice and track using symplectic integrator Integration of code into PLACET

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SLIDE 3

Input

r z Br Bz [cm] [cm] [G] [G] Current input format given above r redundant? r = z tan(xangle) Input format/units should be fixed

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SLIDE 4

Example Field Map 1 2 3 4

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100 200 300 400 500 Bz [T] Br [G]

  • Dist. from IP [m]

Bz Br

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SLIDE 5

Implementation

New class DetectorSolenoid defined

Holds information about the field map Holds coordinate transforms between reference systems

New class IRTracking defined

Contains all other information about tracking procedure 2nd and 4th order symplectic integrator available

All elements in BDS need new function GetMagneticField() defined

Werner Herr, Num. Methods 3rd lecture 5 / 10
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SLIDE 6

Implementation

Example:

... TestIntRegion

  • beam

beam1

  • emitt_file

emitt.dat

  • angle 0.001
  • step 0.005
  • synrad 1
  • filename

ildantinobuck.txt

New tracking method TestIntRegion defined. z=0 in map assumed at end of beamline. If solenoid map does not cover the full length of the beamline, field assumed to be 0 elsewhere. Not available in existing tracking methods, TestFreeCorrection, TestSimpleCorrection...

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SLIDE 7

Implementation - Suggested Alternative

In principle, this is just a new step function Could instead be implemented directly into elements If solenoid map available, simply switch step function inside element

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SLIDE 8

Implementation - Suggested Alternative

In principle, this is just a new step function Could instead be implemented directly into elements If solenoid map available, simply switch step function inside element Would make solenoid field available with existing tracking methods

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SLIDE 9

Implementation - Suggested Alternative

In principle, this is just a new step function Could instead be implemented directly into elements If solenoid map available, simply switch step function inside element Would make solenoid field available with existing tracking methods Existing implementation ~700 lines, nearly finished debugging

Less rewrite of original code Took a few weeks to implement&debug

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SLIDE 10

Implementation - Suggested Alternative

In principle, this is just a new step function Could instead be implemented directly into elements If solenoid map available, simply switch step function inside element Would make solenoid field available with existing tracking methods Existing implementation ~700 lines, nearly finished debugging

Less rewrite of original code Took a few weeks to implement&debug

Implementation requires careful debugging; coordinate system transformations & sign conventions Expect order of 1-2 weeks to write&debug this implementation

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SLIDE 11

Simulation Example

Aim: Study the effect of synchrotron radiation from solenoid field Need to subtract effects from non-optimized BDS, synchrotron radiation of other elements

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SLIDE 12

Simulation Example

Aim: Study the effect of synchrotron radiation from solenoid field Need to subtract effects from non-optimized BDS, synchrotron radiation of other elements Procedure:

Track electrons through without solenoid field or synchrotron radiation

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SLIDE 13

Simulation Example

Aim: Study the effect of synchrotron radiation from solenoid field Need to subtract effects from non-optimized BDS, synchrotron radiation of other elements Procedure:

Track electrons through without solenoid field or synchrotron radiation Flip distribution to positrons Track positrons backwards with solenoid field but without synchrotron radiation

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SLIDE 14

Simulation Example

Aim: Study the effect of synchrotron radiation from solenoid field Need to subtract effects from non-optimized BDS, synchrotron radiation of other elements Procedure:

Track electrons through without solenoid field or synchrotron radiation Flip distribution to positrons Track positrons backwards with solenoid field but without synchrotron radiation Flip distribution to electrons Track electrons forwards through the beamline with solenoid field & synchrotron radiation

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SLIDE 15

Simulation Example

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y [µm]
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first back w/sol w/sol&synrad 9 / 10
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SLIDE 16

Simulation Example

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first back w/sol w/sol&synrad

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SLIDE 17

Summary

Solenoid implementation soon ready, mostly debugged. Alternative implementation has been suggested

Would provide some added functionality Would probably be easier to maintain Time estimate ~week, expect some time for debugging

Should decide on input format, sign convention, & units

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