CNGS Overview Konrad Elsener

05 Sept 2006 CNGS Overviewpresented by K. Elsener to NBI2006

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CNGS Overview

Konrad Elsener


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OUTLINE

1. The CNGS beam2. Schedule3. Status4. Summary


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400 GeV protons from SPS,fast extracted ( 2 x 10.5 s, t=50 ms)

10 cm long graphite rods

1.The CNGS beam – main components

Helium tanks


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150 kA

180 kA

Helium tanks

1. The CNGS beam – main components

50 ms


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= 2.45 m steel tube, t = 18 mmsurrounded by 50 cm concrete;- NO COOLING -vacuum 1 mbarentrance window 3 mm Tiexit window 50 mm steel

Helium tanks



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V = 1 litre air-filled ionisation chambers

(17->37 fixed + 1 moveable detector in both muon detection chambers)

800 m 100 m 1000m 67 m

Helium tanks

TBID(SEM monitor)



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2. Schedule

10 July 2006


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3. Status

construction:completed

commissioning:done

CNGS operational !


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3. Status

construction:completed

commissioning:done

CNGS operational !


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3a. Status

BPM: not o.k.BTV: ? not aligned ?target: not aligned w/beam not aligned w/hornhorns: polarity wrong, timing wrong, alarm (conductivity)data logging: missing spillsdecay tube pumps: one “dead”ventilation: not o.k.smoke detection: problems.... ....


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- Hardware commissioning / cold check-outBeam instrumentations Feb. – April 2006Power suppliesMagnets (incl. polarities)Vacuum system(April / May: Target / Horn exchange excercises “real”)

- “Dry runs” April – May 2006TimingControls InterlocksBeam permitMagnets (current & polarities)

- Commissioning with beam 2006: weeks 28, 30 and 33

3. Status


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3c. Status

week 28 week 30 week 33

1x1013

total number of protons used: 7.8x1015

(equivalent to 1 hour of CNGS running with nominal beam)


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how did we use these “few” protons ?

... answers throughout this workshop ...

3. Status


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• Put some plots here, ex. Horn current vs. time, or ex. T40 temp. vs. time

3. Status

week 33M

D -

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d

MD

– n

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eam

acc

es

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operation

horn current extraction 1


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MD

– n

o b

eam

acc

es

s

horn current extraction 1


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PRELIMINARYmore on Friday, 8 Sept. (Edda’s talk)

Quality check – muon monitors(example: Pit 1 - horizontal plane)

data <> Fluka

3. Status


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... other problems ... (construction)

February 2006: safety shutter -> not on safe power (!)decay tube air-inlet “local controls”

March 2006: helium purity BAD (weather changed...)

30 June 2006: hadron stop water leak (flowmeters)

... more problems ... (commissioning)

MKE kickers not working reliably – fixed “last minute”

beam availability from the PS + SPS (PS septum change, etc.)

radioactive cooling water from the TED (beam dump in extr. line)

two out of 4 air-cooling units in the service gallery have a fault

details of TBID readout still need to be understood (electronics?)

3. Status


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... on the sunny side: “everything works”!

-> was wonderful to see how smoothly the proton beam came on

-> impressive (to me) to see the tools at work for proton beam analysis

-> little trouble moving/turning the target

-> horn + reflector are working reliably

-> beam interlock system is a success

-> controls systems were rarely a cause of trouble (“dry runs” paid off!)

-> it was great to get so many additional muon monitors in week 29 !

3. Status


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4. Summary

CNGS project was approved in December 1999

Civil Engineering – Equipment design – production- installation phases lasted 6 years

CNGS completed on budget and within the 2002 schedule.

two of our “main worries” at NBI2005 are gone (target / horns ready and installed in time)

the two other “main worries” remain(target chamber heating/cooling calculations,

decay tube heating + stresses )

CNGS is operational – but the toughest part is still ahead !

Lesson learned: hardware commissioning for “services” !!!


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1.3E+13

1.35E+13

1.4E+13

1.45E+13

1.5E+13

1.55E+13

1.6E+13

1.65E+13

1.7E+13

1.75E+13

1.8E+13

8/25/20060:00:00.000

8/25/200612:00:00.000

8/26/20060:00:00.000

8/26/200612:00:00.000

8/27/20060:00:00.000

8/27/200612:00:00.000

8/28/20060:00:00.000

8/28/200612:00:00.000

8/29/20060:00:00.000

148600

148700

148800

148900

149000

149100

149200

149300

149400

149500

149600

p.o.t. (1st extr.) horn current [A]

CNGS Overview Konrad Elsener

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