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CNGS Project: primary beam. Project Overview 2. Proton beam line overview and status 3. Target status 4. Commissioning preparation. 1. Project Overview. (see http://cern.ch/cngs). CNGS – a long base-line neutrino beam facility (732 km) send n m beam -> detect n t appearance

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slide1
CNGS Project: primary beam
  • Project Overview

2. Proton beam line overview and status

3. Target status

4.Commissioning preparation

slide2
1. Project Overview

(see http://cern.ch/cngs)

CNGS – a long base-line neutrino beam facility (732 km)

sendnm beam ->detectnt appearance

CNGS project at CERN: production of the nmbeam

using protons from the existing accelerator chain

At Gran Sasso:

OPERA detecting nt

slide3
CNGS: the main components

700 m 100 m 1000m 67 m

vacuum

p + C (interactions) p+, K+, (+) (decay in flight)  m+ + nm

slide6
Nominal beam parameters

Upgrade

phase:

3.5 1013 p

slide7
Optics at Target

Nominal parameters :

  • Beta at focus : 10 m, 20m
  • Beam size sat 400 GeV : 0.5 mm
  • Beam divergence s’ at 400 GeV : 0.05, 0.03 mrad

Possible to increase further the beam size

slide9
TT41 extraction point to beam dump

TA40

Beam

Dump

TED

TT40

MBHA 15mrad

CNGS&LHC beam

SPS

extraction

point

SPS beam

MBHC 13mrad

Safety beam

stopper

to CNGS

target

TT40

to LHC

MBSG 25mrad

SPS

slide10
Transfer line layout: half cell

MDG

BEAM

MBG

Electrical distribution box

5.6% slope

BEAM

QTG

Magnet

Interlock

box

BPM

control

box

slide11
New TT41 magnets

MBG

73 magnets (78 ordered)

Nominal field : 1.7 T @ 400 GeV

Magnetic length : 6.3 m

Gap height 37 mm

QTG

20 magnets (23 ordered)

Magnetic aperture : 45 mm

Nominal gradient 40 T/m, 2.2 m long

MDG

12 magnets (17 ordered)

Gap height : 45 mm

Bending angle 80 mrad

Overall length: 700mm

slide14
Target

Beam

TBID

BPM2

BPM3

BPM1

BFCT

5 m

5 m

3 m

BTV1

BTV2

BTV3

2 BLMs

Last 20m of TT41

slide16
beam

collimator

target

horn

In order to protect the neck of the horn inner conductor

d=18 mm): 1 m collimator in Boron Nitrite, d=14 mm.

slide17
BN collimator

Proton beam: last beam position / beam profile monitors upstream of the target station collimator and shielding

slide18
18 beam position monitors in proton beam line (BPG) + 4 in common line with LHC (BPK)

1 coupler in air on target table (BPKG)

8 proton beam profile monitors (BTVG)

18 beam loss monitors (BLM)

1 beam current transformer (BFCT) (+1 BFCT in common line with LHC

Beam line instrumentation

slide19
18 Button Electrode

BPGs in TT41

60mm Aperture

Beam Position Monitoring

Beam Position Measurement Requirements

Intensity Range:

11012 to 3.51013

slide20
Target Beam Position Monitor

Target Beam Position Measurement Requirements

Final standard BPG of the proton beam line & target BPKG

 used to provide position at the target

 setting up performed using final beam line BPG

 aiming at target rods verified & tracked using target BPKG

 accuracy of measurement ±0.2mm in ±2mm central region.

 accuracy of measurement ±0.5mm outside ±2mm central region.

slide21
BPKG – special beam position monitor on target table

Stripline Coupler Pick-up operated in air

slide22
Beam Profile monitors

75 mm carbon and 12 mm titanium screens

5 to 10 % precision requested

Ti screen “in”

slide23
Beam Loss Monitoring

Beam losses will be detected using:

 18 standard 1 litre, SPS, nitrogen filled ionisation chambers

 30 parallel plates with 5mm separation - ionisation length of 19cm

 efficiency of ~1250 pairs per primary charge

slide24
First BCT sees both LHC &

CNGS beams

  • Has to fulfill additional requirement of LHC bunch by bunch capability

(i.e. 25ns resolution)

Beam Current Transformers

Two Monitors – one at the beginning & one at the end of the line

Absolute Accuracy of 1% for the Intensity Range: 11012 to 3.51013

slide26
Target Station

“Graphite rods”, L = 10 cm, F = 5 / 4 mm

The target unit is conceived as astatic sealed systemfilled with 0.5 bar of He.

End cap

DownstreamWindow

Sealed finned tube

Target Support

Inert gas

Central tube

MATERIALS

Tube: Al-Mg alloy

Windows: Be by Brush & Wellman

Target Support: Carbon Fiber reinforced Carbon

Target rod: Fine-grain graphite, sintered carbon, C-C composite

End cap

UpstreamWindow

slide28
Target Magazine + BPKG

BPKG

Indexing finger

4 commissioning preparation
4. Commissioning preparation
  • First extraction tests
  • b) Plans for the commissioning periods
slide34
Profiles

Profiles

Profiles

Beam

Current

Monitor

TA40

Beam

dump

Beam loss

monitors

TT40

CNGS&LHC beam

SPS

extraction

point

SPS

extraction

point

SPS beam

First checks of CNGS

beam extraction

Safety beam

stopper

to target

TT40

to LHC

SPS

slide36
Commissioningschedule
  • Hardware commissioning Feb. – April 2006
  • Beam instrumentations: BLM and BTVG done, BPG in progress
  • Power supplies done
  • Magnets (polarities) in progress
  • Vacuum system done

- “Dry runs” April – May 2006

Timing

Controls

Interlocks

Beam permit

Magnets (current & polarities)

- Commissioning with beam 2006: weeks 22, 25 and 27

slide37
Commissioning schedule

Week 22 : low intensity

Week 25 : low to medium intensity

Week 27 : high intensity, full facility

slide38
SPS Cycle Proposal for 2006
  • Commissioning:

12s FT + 6s CNGS

  • Run 1

12s FT + 6s CNGS + 4.8s MD

  • Run 2

12s FT + 3x6s CNGS + 4.8s MD

slide39
Plans for week 22

Upper limit of total protons sets to 2 1016 for week 22

slide40
Plans for week 25

Upper limit of total protons sets to 3 1016 for week 25

slide41
Plans for week 27

Upper limit of total protons sets to 5 1016 for week 27

slide44
TAG41

TCC4

TSG4

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