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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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Presentation Transcript
slide1

Beam-Line Analysis …

m. apollonio

CM27 - RAL

1

slide2

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

CM27 - RAL

2

slide4

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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slide5

OnLine Phase Space Reconstruction

Beam Line Online Tuning

Tried also an OL optimisation

(very slow)

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slide6

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

CM27 - RAL

slide7

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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slide8

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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slide9

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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slide10

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)

CM27 - RAL

slide11

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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slide12

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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slide13

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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slide14

Q789 (-)

G4BeamLine

DATA

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slide18

Phase Space study for some Matrix Points

MC (G4Beamline)

DATA

M0 10-240

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slide19

MC (G4Beamline)

DATA

M1 10-240

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slide20

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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slide21

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)

CM27 - RAL

slide22

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

CM27 - RAL

slide23

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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slide24

The end

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slide25

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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25

slide26

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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slide27

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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