Beam-Line Analysis …
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Beam-Line Analysis …. m. apollonio. 1. what a summer …. 335000 target dips into ISIS … 13000000 particle triggers 1500 runs 16 hours shift rotas MOMs BLOCs experts and to finish with … … fireworks at 10V ! VERY IMPORTANT: system was really stable, reliable

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M apollonio

Beam-Line Analysis …

m. apollonio

CM27 - RAL

1


M apollonio

what a summer …

  • 335000 target dips into ISIS …

  • 13000000 particle triggers

  • 1500 runs

  • 16 hours shift rotas

  • MOMs

  • BLOCs

  • experts

  • and to finish with …

  • … fireworks at 10V !

  • VERY IMPORTANT: system was really stable, reliable

  • And it looks like data are in good shape

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M apollonio

The MICE Beam-Line

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TOF (0,1,2)

TOF0 and 1 play a crucial role in this

analysis

(x0,y0)

(x1,y1)

M: transfer matrix

  • Infer x0’ and x1’

  • from x0,x1

  • Reconstruct:

  • P

  • phase space

  • Twiss Parameters

  • emittance

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OnLine Phase Space Reconstruction

Beam Line Online Tuning

Tried also an OL optimisation

(very slow)

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Analysis

  • Commissioning and calibrating the beam line detectors

  • Luminosity Monitor

  • TOF0, 1, 2 / CKOVa, b

  • FermiLab Beam Profile Monitors

  • Commissioning the BL magnets

  • determine the (e,P) matrix

  • compare data to simulation

  • Beam rate vs Target Depth

  • Procedure:

  • data taking campaign at many different optics

  • mainly scan of quadrupoles/triplets to study the effect on ph-space

  • scan of DS

  • monitoring of main scalers / detectors (TOFs)

  • Use of Reference Runs to monitor optics stability

  • mu- / mu+ configurations

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M apollonio

DS scan [E. Chng, IC]

  • DS current reference at 669 Amps(run 2200)

  • DS current varied from -15% to +20%

  • TofTree and TofTrace ran on data to extract mean of x,y and the spread of the beam (σ) at TOF1

Ref. Current

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Beam Characterization [M. Rayner]

  • - Cumulative spectrum of Dt

  • Comparison Feb./Aug. TOF

  • Calibrations

  • - Change in shape due to TOF0

  • Partially “blind” & BL dispersion

  • e-/e+ peak monitoring

  • position & width should be

  • stable

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  • Few points:

  • a shift in calibration (10 ps) between Feb. and Aug.

  • RMS nearly constant: 120 ps ≠ (60 ⊕ 50)

  • so we are not exploiting the full potential of TOFs resolution

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M.R.

Feb. calibration

Aug. calibration

E.C. gauβ fit

To e- peak

E.C. Same pattern, shift of 0.5 ns due to wrong calib file used (debugging now)

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Beam Characterization [R.R.Fletcher]

- Neutral Particles responsible for an apparent Trigger inefficiency

BL+ with D2 ON

BL+ with D2=0

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Beam Characterization [A.Dobbs]

  • Adam had a chance at 10 V … and he did not miss it!

  • soon in a MICE-note

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Quadrupole Scan(s) [S. Blot]

Q789 (- / +) and Q456 (+)

I(triplet) = 050% to 175% of the nominal value

See effect on beam profiles

and phase space

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Q789 (-)

G4BeamLine

DATA

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Phase Space study for some Matrix Points

MC (G4Beamline)

DATA

M0 10-240

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MC (G4Beamline)

DATA

M1 10-240

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DATA M0 6-240 G4Beamline

P=[200,210]

P=[200,210]

???

P=[210,220]

P=[210,220]

P=[220,230]

P=[220,230]

P=[230,240]

P=[230,240]

This result is in disagreement with what found previously …

needs some investigation

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Many matrix points have been produced which

need to be analysed

In particular for (6,200) we have:

M0 (starting optics)

M1 (GA optimisation)

M2 (Minuit Optimisation)

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  • A small army is fighting through the data

  • My apologies if I forgot some name) I am sure more want to be involved.

  • Good agreement DATA vs G4BeamLine (apart from the last result shown)

  • BUT still a lot of work

  • Many people involved in the analysis of these data

  • (MA, SB, CR, MR, EC, …)

  • We need

  • to analyze DATA and produce simulations for … 1500 runs !

  • (surely less than that but quite a number)

  • TOF0-1 distance CRUCIAL for P and ph-space

  • reconstruction

  • - At present we could be wrong by 10-20 cm

  • TOF0,1 exact location?

  • survey in due course

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  • Homework for the 6 months to come

  • Complete the analysis of the JUL-AUG campaign

  • Understand how well we can predict the beamline

  • M. Littlefield is modeling the entire beamline in G4MICE

  • Interesting project: should help us understand TOF PH-SPACE

  • reconstruction

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The end

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STEP I

  • Commissioning and calibrating the beam line detectors

  • Luminosity Monitor

  • TOF0, 1, 2 / CKOVa, b

  • FermiLab Beam Profile Monitors

  • Commissioning the BL magnets

  • determine the (e,P) matrix

  • compare data to simulation

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M apollonio

Layout

  • Goals for STEP I

  • MICE Beam Line

    • detectors

  • DAQ

  • Beam Characterization

    • data taking campaign

  • Tracker for the next phase

  • Software

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M apollonio

Luminosity Monitor

  • Particle Rate close to Target point

  • PoT as function of Target Depth (independent from BLMs)

  • installed in the ISIS vault and commissioned

  • coincidence to reduce spurious counts

  • correlation LM vs BLM

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