Status of CNGS
Konrad Elsener
CERN – Accelerators+Beams Division

7 November 2003

Status of CNGS
NBI2003 - presented by K. Elsener1

before I start...

7 November 2003

Status of CNGS
NBI2003 - presented by K. Elsener2

Status of CNGSOUTLINE
1. The CNGS beam
2. Schedule
3. Status of works
4. Summary

7 November 2003

Status of CNGS
NBI2003 - presented by K. Elsener3

1. The CNGS beam
10 cm long graphite rods
(13 segments, interspaced);total length 2 m; Φ = 5 / 4 mm
Helium tanks

400 GeV protons from SPS,
fast extracted ( 2 x 10.5 µs, ∆t=50 ms)
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Status of CNGS
NBI2003 - presented by K. Elsener4

target magazine

p-beammonitor(BPKG)

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NBI2003 - presented by K. Elsener5

Helium tanks

150 kAΦ = 2.45 m steel tube, t = 18 mm
180 kA

7 November 2003

surrounded by 50 cm concrete;- NO COOLING vacuum 1 mbar
entrance window 2mm Ti
exit window 50 mm steel

Status of CNGS
NBI2003 - presented by K. Elsener6800 m

100 m

1000m

67 m

Helium tanks

V = 1 litre air-filled ionisation chambers(17 fixed + 1 moveable detector
in both muon detection chambers)

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NBI2003 - presented by K. Elsener77 November 2003

Status of CNGS
NBI2003 - presented by K. Elsener

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SPS supercycles for CNGS runningwith Fixed Target or LHC filling

CNGS + fixed target

CNGS + LHC

For 1 year of CNGS operation (200 days) we expect:(4.8x1013 protons in SPS, 55% efficiency -- 1998 )4.5 x 1019 protons on target (“nominal”)

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Status of CNGS
NBI2003 - presented by K. Elsener

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SPS magnet cycle for CNGS – Sept. 2002MAIN BEND CURRENT [A]

6000
5000

MEASUREDDEMANDED

4000
3000
2000
1000
007 November 2003

1000

2000

3000
TIME [ms]Status of CNGS
NBI2003 - presented by K. Elsener

4000

5000

6000
10SPS magnet cycle for CNGS – Sept. 2002

MAIN BEND CURRENT [A]500450
MEASUREDDEMANDED

400
350
300
250
200
150
100
0

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1000

2000

3000
TIME [ms]Status of CNGS
NBI2003 - presented by K. Elsener

4000

5000

6000
112. Schedule
Note: due to PS/SPS stop in 2005 (decided in June 2002)-> start of CNGS now planned for 2006 instead of 2005

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Status of CNGS
NBI2003 - presented by K. Elsener12

3. Status of works
3a. Civil Engineering – Phase I

127 October
2000
November 2003

Status of CNGS
NBI2003 - presented by K. Elsener13

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Status of CNGS
Protontunnel – Feb.
2002
7 Novemberbeam
2003
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Status of CNGS
Protonbeamtunnel – April
2003
7 November
2003
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7 November 2003

Status of CNGS
NBI2003 - presented by K. Elsener17Service Gallerytransformer

Air cooling unit (resepump

strip-line

Target Chamber

HornHelium tank
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Absorbed
in concreteof TSG4gallery
Absorbed
does indose
concretewallswallsof service
19(based on 13.8 × 10 pot/y)510side passage “horn”

410

3

annual dose in Gy

10210

1

10010-1

10target

CNGS target

-2

10-3

10-1000

01000 2000 3000 4000 5000 6000 7000 8000 9000 10000 11000 12000

z in cm

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beam

Status of CNGS
NBI2003 - presented by K. Elsener193b. Infrastructure
Hadron stop + muon detector access galleries:(access via LHC – TI8)

going towards completion (Jan. 2004)

shot-crete
10% slope
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NBI2003 - presented by K. Elsener20

3c. Equipment

Extraction from SPS + TT40 (common with LHC):
concept tested successfully with beam;pulse shape for CNGS double pulse to be done

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Status of CNGS
NBI2003 - presented by K. Elsener21Extraction from SPS –SPS: 23 µs

Timing foreseen for 10.5 µs CNGS pulse:

CNGS needs: fast rise and fall time,
2% ripple over the full length of flat top( Note: two such pulses are needed, 50 ms apart)
7 November 2003

Status of CNGS
NBI2003 - presented by K. Elsener22extracted beam(8 Oct. 2003)
σx = 1 mm, σy=0.6 mm

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3c. Equipment

Proton beam (cf. M. Meddahi + R. Jones):• magnets from Novosibirsk are arriving at a regular rythm(37 bends arrived, 1st quad arrived ;corrector magnet design is finished)• vacuum system design complete (except window -> L. Bruno)• beam monitoring equipment under construction(except target monitor -> R. Jones)

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NBI2003 - presented by K. Elsener24

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3c. Equipment (cont.)
Target station (cf. L. Bruno):
design progressing, shielding design approaching completion,
target unit prototype under construction

Horn/Reflector (cf. S. Rangod, S .Wallon, G. Maire)
under construction (horn inner conductors: finished, under test)
water cooling circuit in design phaseelectrical system: new capacitors ordered

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3d. Decay Tube + Windows(cf. A. Pardons):• first decay tube sleeves have arrived at CERN
long, difficult job to build the 1 km tube;(contractor has reserved a lot of time forvacuum testing...)

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3d. Decay Tube + Windows (cont.)(cf. A. Pardons):• exit window is already in the hadron stop chamber (ready)• entrance window: exists, needs to be mounted• vacuum pumps: ordered

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NBI2003 - presented by K. Elsener30

exit flange“in the box”

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NBI2003 - presented by K. Elsener31

3e. Hadron Stop (beam dump)(cf. A. Pardons):
finished (except water cooling connections)

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NBI2003 - presented by K. Elsener32

1 July 2003
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4. Summary
CNGS civil works are completed (phase I),hadron stop installed--> CNGS is “on schedule” for May 2006
Next major step on the site:--> installation of decay tube,
then finalize civil works –> Aug. ’04
Main problem: m&m
Our worries: welding decay tube, windows, beam stability,
target rods, target monitor,shielding + radioactive handling,...

(cf. the other CNGS talks)

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NBI2003 - presented by K. Elsener34

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NBI2003 - presented by K. Elsener35

V = 1 litre air-filled ionisation chambers(17 fixed + 1 moveable detectorin both muon detection chambers)

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NBI2003 - presented by K. Elsener36

CNGS: effects of alignment errors– study the needs of remotely controlled movements
effect on ντ cc events

Examples:horn off axisby 6 mm< 3%

reflector off axis
by 30 mm3%

proton beam on target
off axis by 1 mm

< 3%

CNGS facility misaligned< 3%by 0.5 mrad (beam 360 m off)

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NBI2003 - presented by K. Elsener37

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3b. Infrastructureother areas of CNGS:- crane in target chamber: contract adjudicated- ventilation: bids opened- water cooling systems: call for tender- electrical systems: in progress (using existing contracts)

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NBI2003 - presented by K. Elsener39