CERN Neutrinos to Gran Sasso: The CNGS Facility at CERN l Edda Gschwendtner, CERN
Beam Instrumentations: Requirements for Proton and Electron Beams C. Bracco, E. Gschwendtner, B....
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Transcript of Beam Instrumentations: Requirements for Proton and Electron Beams C. Bracco, E. Gschwendtner, B....
![Page 1: Beam Instrumentations: Requirements for Proton and Electron Beams C. Bracco, E. Gschwendtner, B. Goddard, M. Meddahi, A. Petrenko, F. Velotti Acknowledgements:](https://reader035.fdocuments.in/reader035/viewer/2022070407/56649e375503460f94b26e50/html5/thumbnails/1.jpg)
Beam Instrumentations: Requirements for Proton and Electron Beams
C. Bracco, E. Gschwendtner, B. Goddard, M. Meddahi, A. Petrenko, F. Velotti
Acknowledgements: WP3 and WP4 members, P. Muggli and A. Caldwell
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Outlines Introduction
Layout and optics Electron and proton beam integration (side-injection, on-axis injection)
Electron beam line Beam characteristics Lattice Wish list for diagnostics
Proton beam line Beam characteristics Lattice Wish list for diagnostics
Summary
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Reminder
Three beams into the game!
7.16 %
Phase 1 (2016): protons + laser beam prove SMI
Phase 2 (2017): protons + laser + electron beam probe acceleration
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Proton and Electron Beam Common beam line last ~4.4 m before plasma cell
C. Magnier, F. Galleazzi
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Proton and Electron Beam15
-25
mm
20 m
m
10 m
40 m
m
<0.5 mm
p
e
10 m
40 m
m
pe
40 m
m
Side injection
On axis injection
20 m
m24
mm
s=801mOff axis!!
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Electron Beam Line
Momentum [GeV/c] 10-20 (nom. 15)
# bunches 1
p+ per bunch 2.0 × 109
Current [nC] 0.3
Norm. Emittance [mm mrad]
2
e-
e-p+
On-axis inj
Quads inside the connection tunnel
Final triplet
* *tot. envelope: 2x Envelope Hor/Verbeam pipes Ø: 15-25 mm
F. m. Velotti
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Electron Beam Line
1. Emittance measurement at beginning of the line Available space (~50 cm) between elements in the
connection tunnel Vertical dispersion non-zero
2. Beam size at the plasma cell3. BPMs for correction assuming 1vs1 strategy
14 (1 per quad) + 2 before the plasma cell 6 of them in the common part with p+
4. Momentum measurements Spectrometer at the end of RF gun? At one of the h-
bends?
5. Bunch length measurements 6. Current measurements
F. m. Velotti
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Electron Beam Line
1. Emittance measurement at beginning of the line Available space (~50 cm) between elements in the
connection tunnel Vertical dispersion non-zero
2. Beam size at the plasma cell3. BPMs for correction assuming 1vs1 strategy
14 (1 per quad) + 2 before the plasma cell 6 of them in the common part with p+
4. Momentum measurements Spectrometer at the end of RF gun? At one of the h-
bends?
5. Bunch length measurements 6. Current measurements
Measurements
Precision Position
Emittance +/- 200 m Connection tunnel
Beam size +/- 50 m Before plasma cell
Beam position +/- 200 m+/- 50 m
@ quads and before plasma cell
Momentum +/- 7.5 keV horizontal bends
Current < 1% Before/after plasma cell
F. m. Velotti
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Proton Beam
CNGS AWAKENominal Setup
Momentum [GeV/c] 400 400 400
# bunches 2100 1 1
p+ per bunch 1.05 × 1010 3 × 1011 5 × 109
Repetition rate [s] 6 30 ---
Norm. Emittance [mm mrad]
~8 2-3.5 1-2
Specifications (based on LHC TL and HiRadMat requirements) for the unchanged part of the beam line (everything installed upstream of BTVG.412108) :
•BPM:• 0.2 mm total accuracy • Resolution: 0.1 mm (within 20 mm radius)
•BCT:• 1->2% absolute precision
•BTV: • Beam size precision: 0.1 mm
•BLM:• Detect local loss of 5e8 charges
Diagnostics for single bunches!
~74 times lower intensity than
CNGS
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Changes in the Proton Beam Line
Instrumentation presently installed:
BTVG.412108BPG.412211BLM.412243BPG.412321BPG.412424BTVG.412424BFCT.412425BTVG.412434BLMr.412445/BLMl.412445BPG.412444BTV.412445BPKG.412449
Target Area (not possible to reuse)
Possible to reuse? (provided required modifications)
~ 90 m
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What is Needed in the “New Line”?
BPG
BPG
BPG
BPG
BPG
BPG
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What is Needed in the “New Line”?
BPG
BPG
BPG
BPG
BPG
BPG
BPG
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Proton and Laser Beam
Plasma cell
Not real bottleneck
Laser
Prot
on
± 8 mm
± 6 mm
~7 mm (it must be > 5 mm!)
BPG
new
BPG
BPG
new
BPG
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What is Needed in the “New Line”?
BPG
BPG
BPG
BPG
BPG
BPG
BPG
BPG
BPG
BPG
BPG
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Required Pointing Accuracy
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Required Pointing Accuracy
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Beam Envelope at BPMs
s**[m]
Tot. Env. X[mm]
Tot. Env. Y[mm]
Beam Pipe[mm]
Accuracy[mm]
BPG.412211 749.420 16.5 31.1 60 0.2
BPG.412321 777.575 24.0 14.0 50* 0.2
BPG.412424 785.025 15.0 13.9 50* 0.2
BPG.412xxx 788.025 13.2 12.3 50* 0.2
BPG.412xxx 798.825 7.0 6.7 40 0.05
BPG.412xxx 805.325 4.8 4.8 20/40*** 0.05
BPG.412xxx 815.825 9.2 8.3 40 0.05
BPG.412xxx 822.825 13.4 12.0 40 0.05
** end position * 50 mm (inner diameter) vacuum chamber for new B190 dipoles, to be checked if still compatible with 60 mm aperture at BPMs (J. Hansen)*** side injection/ on axis injection
Downstream of plasma cell
Interlocked!
Extraction from SPS must be stopped if beyond tolerances: 100 m and 15 rad
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What is Needed in the “New Line”?
BTV
BTV
BTV
BTV
BTV
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Proton Beam Line Optics Requirements
Round beam with a beam size @ plasma cell entrance 1 = 200 ± 20 m
Achieved: 1 = 202 m
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Beam Envelope at BTVs
S [m]
Tot. Env. X[mm]
Tot. Env. Y[mm]
Beam Pipe[mm]
Accuracy[mm]
BTV.412108 740.215 13.2 30.6 60 0.2
BTV.412xxx 804.675 4.8 4.8 20/40* <0.05
BTV.412xxx 820.675 12.1 10.8 40 <0.05Downstream of plasma cell
The last two BTVs have to be used also for the proton and laser beam setup (position: two beams coaxial) a screen has to be added for the laser beam (reduced power during setup, see Mikhail’s talk)
The Monitor downstream can be used also for the e-beam
Position and beam size measurements
* side injection/ on axis injection
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What is Needed in the “New Line”?
BLM
BLM
BLM @ location of vertical bottleneck (5e8 charges)BCT: 1-2% absolute precision
BC
T
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Summary 1/2 Electron beam line:
Completely new diagnostics to measure: Emittance Energy Beam size @ plasma cell Beam position Bunch length Current
Proton beam line: Adapt existing diagnostics for AWAKE operation (1 bunch) up to
BTVG.412108 (excluded) + reuse part of remaining diagnostics Five additional BPM Two additional monitors for beam size measurements of the p
beam and position measurements for p and laser
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Summary 1/2
Main challenges: Coexistence of the e an p beams Reduced beam pipe diameters (15-24 mm) Almost no space around the beam pipes in common part of
the lines (we’ll try to optimize the lattice): How to implement pickups for position measurements? How to perform beam profile measurements?
Required very high accuracy in position measurements for p and laser beam
Low electron energy and current The option of having a unique design for on axis and side-
injection is being evaluated: double diagnostics at the end of the line…..