Solenoid effects in CLIC Yngve Inntjore Levinsen, Barbara Dalena, - - PowerPoint PPT Presentation

solenoid effects in clic
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Solenoid effects in CLIC Yngve Inntjore Levinsen, Barbara Dalena, - - PowerPoint PPT Presentation

Solenoid effects in CLIC Yngve Inntjore Levinsen, Barbara Dalena, Rogelio Toms Garcia Linear Collider Workshop 25. October, 2012 IR Tracking in PLACET Integration of code Trajectory comparison with old code Recent results Future planning


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SLIDE 1

Solenoid effects in CLIC

Yngve Inntjore Levinsen, Barbara Dalena, Rogelio Tomás Garcia

Linear Collider Workshop

  • 25. October, 2012
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SLIDE 2

IR Tracking in PLACET

Integration of code Trajectory comparison with old code Recent results Future planning

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SLIDE 3

IR Tracking in PLACET

... TestIntRegion

  • beam

beam1

  • emitt_file

emitt.dat

  • angle 0.001
  • step 0.005
  • synrad 1
  • filename

ildantinobuck.txt

Tracking method TestIntRegion now considered fully debugged. 4th order symplectic integrator. Example in svn, in folder examples/irtracking. Dipoles not correctly treated yet (challenging to define orbit). Not available in existing tracking methods, TestFreeCorrection, TestSimpleCorrection...

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SLIDE 4

Code Comparison

Trajectories...

18 16 14 12 10 8 6 4 2

Distance from IP [m]

20 20 40 60 80 100 120 140

x [um] Horizontal trajectories PLACET Old

18 16 14 12 10 8 6 4 2

Distance from IP [m]

160 140 120 100 80 60 40 20

y [um] Vertical trajectories PLACET Old

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SLIDE 5

Code Comparison

Trajectories...

18 16 14 12 10 8 6 4 2

Distance from IP [m]

0.1 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7

Difference (PLACET - Old) [nm] Difference between trajectories vertical horizontal

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SLIDE 6

Code Comparison

Luminosity...

Old PLACET Lpeak 96.7 % 95.5 % Ltot 95.7 % 95.3 % Numbers are averages from several GUINEA-PIG runs. Excellent agreement between the two codes. Used map “ildantinobuck”, an old ILD map without bucking coil.

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SLIDE 7

Preliminary Results

5 4 3 2 1 1 1 2 3 4 5

Bz [T]

5 4 3 2 1 0.02 0.00 0.02 0.04 0.06 0.08 0.10

Br [T]

Map from November 2011 (update underway) SiD with anti-solenoid. Main luminosity loss from combination of QD0-field and Br.

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SLIDE 8

Preliminary Results

Vertical Orbit

7 6 5 4 3 2 1

Dist from IP [m]

2 2 4 6 8 10 12

y [um]

About 11 µm Similar to previous results using old code

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SLIDE 9

Preliminary Results

Distributions at IP - only synchrotron radiation

−2 −1 1 2

y [nm]

−10 −5 5 10

xp [µrad]

25 50 75 100 125 150 −50 50

x [nm]

−2 −1 1 2

y [nm]

25 50 75 100 125 150 −2 −1 1 2

y [nm]

−15 −10 −5 5 10 15

yp [µrad]

25 50 75 100 125 150 1490 1492 1494 1496 1498 1500 1502

Energy [GeV]

−2 −1 1 2

y [nm]

15 30 45 60 75

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SLIDE 10

Preliminary Results

Distributions at IP - SR and Solenoid

−5380 −5370 −5360 −5350 −5340 −5330 −5320

y [nm]

−20 −15 −10 −5 5 10 15

xp [µrad]

5 10 15 20 25 30 −100 −50 50 100

x [nm]

−5380 −5370 −5360 −5350 −5340 −5330 −5320

y [nm]

5 10 15 20 25 30 −5380 −5370 −5360 −5350 −5340 −5330 −5320

y [nm]

−40 −30 −20 −10

yp [µrad]

5 10 15 20 25 30 1490 1492 1494 1496 1498 1500 1502

Energy [GeV]

−5380 −5370 −5360 −5350 −5340 −5330 −5320

y [nm]

10 20 30 40 50 60

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SLIDE 11

Preliminary Results

Luminosity

w/o solenoid w solenoid [1034/cm2/s] [% of ideal] Lpeak 1.91 96.5 Ltot 6.38 96.1 Better than reported last year (~14%). We found after a lot of debugging that synchrotron radiation was counted twice (+10%).

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SLIDE 12

Preliminary Results

Tuning

1 2 3 4 5 6 7 8 9

QD0 vert. pos. [um]

10 20 30 40 50 60 70 80 90

L/L0 [%] 12 / 14

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SLIDE 13

Summary

Code finally gives results in excellent agreement with previous external code. Theoretical luminosity loss due to solenoid with most recent SiD map ~ 4-5 %.

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SLIDE 14

Next Steps

Tuning simulations. [started] Analyse new field maps. [underway] Misalignments of solenoid wrt beamline.

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