CNGS PROJECT STATUS

D.Autiero21/5/2003

General status2003 Project review CNGS upgrade

The CNGS project is on schedule we are going to get the beam in May 2006

Civil engineering almost completed, end of worksforeseen by 18/6/2003, (one month delay)

Budget under control

No major technical problems

Passed the external review

CNGS upgrade well under way

CNGS schedule(schematic, simplified version)

“March update”

Target Chamber – December 2002

Connection to TI8 Tunnel – 25/02/03

Ventilation Chamber, view downstream – 21/02/03

ServiceGallery

JunctiontowardsTargetChamber

CNGS Status “today”: ON SCHEDULE

excavation completedconcreting in progress

CE works finished in June 2003

next steps: • survey works (3 weeks)• installation hadron stopper (July/Aug. 2003)

• installation decay tube (until summer 2004)…

N.B. - TT41 proton beam dipoles and quads will all arrive in 2003 - first final horn will arrive in summer 2003

…

CNGS external review (28/4/2003), last review 18/2/2002:

Civil engineering: no design changes, crosscheck of decay tunnel direction with a vertical hole from the LHC tunnel, 36 mm off, correctable with the decay pipe positioning, oil found close to the target chamber, some more complications in draining and ventilation.

Costs (2002 costs update): 1999 cost 71 MCHF (2.5 contingency, 60 external), manpower 59 FTE2002 cost 79 MCHF (2.5 contingency, 62 external), 84 FTE

In 2002 the external committee stressed the necessity of containing the costs and finding possible savings2003 update 79 MCHF (overall no changes, equipment –0.541, infrastructures +0.168 etc ..) O.K.But .. CERN has decided that the overall cost should stay within 77.6 MHCFThe project is going with 1.4 MCHF less contingency

Most of the 79 MCHF have been spent, of the remaining money 17 MCHF committed, 14 MCHF not assigned yet (decay tube cost not known yet).

Contingency to be used for access doors, fire protection, travel costs

The external review has found that the project is on schedule and within expected costs, efforts for savings have been done and there are no evident other possible savings

There is a concern for the reduced contingency

The manpower is just at the limit of what is needed, there is a lack of manpower for the simulation of heating due to the beam, radiation doses, residual radiation.Some implications:

Target cooling, alignment of target support structureRadiation doses for servicingHeat deformation of the horn support connections

The CNGS upgrade was not mentioned at all in the review

CNGS UpgradeIncrease the number of protons on target by overcoming some PS limitations, see R. CAPPI / SL Seminar, 21.03.2002, CERN/PS 2001-041, space charge effects limits the PS to 4.8 E 13 p/p, to reach this max intensity a double batch injection system (2x4 bunches of 0.6 E 13 p) will be implemented with the PS booster pulsing at a rate two times higher, the SPS filling time will increase by 0.6 s

The intensity gain is equivalent to a factor 1.46 with an extra expenditure of 1 MCHF which is completely funded (this is why in March we started to include this extra factor in the OPERA numbers)

MD time has been allocated with high priority this year to complete the tests and implement the hardware modifications, there are no reasons at the moment to doubt that the improvement will be achieved but ..

Despite the efforts of K.Elsner there is no written statement that the intensity will be increased by 2006, the PS people prefer first to complete the tests this year.

For the possibility of dedicated mode see the infomations later.

The various schemes

# Description N sps [1013p/p]

POT flux [1013p/s]

Gain = / 0.8

~Cost~ [MCHF]

Remarks

0 present nominal scheme (reference)

4.8 4.8 / 6 = 0.8 1 0 Already difficult

1.1 =0 + double batch PS inj. 7.7 7.7 / 7.2 = 1.07 1.34 0 Higher Nsps but longer cycle

1.1a 1.1 + PSB @ 0.6s 7.7 7.7 / 6.6 = 1.17 1.46 1 Important HW modifications (?) Improvements for ISOLDE

1.2 1.1 + new5-turnCT 8.6 8.6 / 7.2 = 1.19 1.49 1 Better transfer efficiency (lower losses)

1.2a 1.2 + PSB @ 0.6s 8.6 8.6 / 6.6 = 1.30 1.63 2 Best of group 1

1.3 1.2 + 26GeV/c 8.6 8.6 / 8.4 = 1.02 1.28 3 No transition in SPS CT @ 26GeV/c ?

1.3a 1.3 + displaced & shortened PSB cycle

8.6 8.6 / 7.2 = 1.2 1.5 3 Very attactive

2.1 1.2 + a new H- 120MeV Linac

8.6 8.6 / 6 = 1.43 1.79 60 Improvements also for LHC, ISOLDE,…

3.1 SPL at 2.2GeV + new 5-turnCT at 14GeV/c

23 23 / 6 = 3.83 4.79 300 Extremely high coll. effects =>UNREALISTIC

All calculations for neutrino interactions in OPERA, since the proposal, were based on the rates per unit of detector mass given by the CNGS working group. These rates are correct but are, as usual, computed in a general way for an isoscalar target (made of nuclei containing the same number of neutrons and protons).

The DIS CC cross section is about a factor two larger on neutrons than on protons, related to the d structure functions. Most of the QE and RES reactions occur on neutrons only. Lead has an excess of neutrons e.g. Pb207 (N=125, Z=82), so a non-isoscalarity correction has to be applied to the standard rates. NC will not be affected significatively while the number of CC interactions will increase.

Non-isoscalarity corrections for OPERA

Muonic neutrino and antineutrino charged current cross sections on nucleon (isoscalar cross-sections)

DIS CC correction (FDIS):

ARZNR

AZNF

iso

pnDIS

2)1(

p

nR

2pn

iso

Where:

QE and RES CC corrections (FNS):Reactions on neutrons FNS=N/(A/2)Reactions on protons FNS=Z/(A/2)

DIS

R

DIS

FDIS

QE+RES

FNS

ALL

FTOT

CC 2.04 1.071 1.14 1.079

CC2.5 10-3eV2

2.67 1.095 1.14 1.11

The kinematical suppression for tau production (going as 1/x) increases R in DIS

+8%

+11%

Summary:

• NC (and NC related background) are practically unchanged• /e CC (and related backgrounds) increase by 8%• Signal events increase by 11%• Number of extracted bricks (dominated by CC+NC)increase by 6%

These modifications have been implemented with the factor 1.46Of the CNGS upgrade in the March presentation to the LNGS committee

Evts/day Shared mode

4.5 1019 pot/year

(x 1.46)

Dedicated mode

7.6 1019 pot/year

( x 1.46)

NC 10.96 18.52

CC DIS 31.42 53.10

CC QE+RES 4.07 6.38

Total 46.45 78.5

Conclusions The CNGS project has passed its second external review, it is in good shape from the technical point of view and the costs containement. We will get the beam in May 2006 ! The CNGS upgrade has been financed and will bring a factor 1.46 increase in the flux The CERN management has just decided that there will be a workshop in the summer-autumn of 2004 to discuss the non LHC physics at CERN and the beam ditribution in 2006-2007, it will be the place where we will have to defend a request for dedicated mode to get more p.o.t. We have one year to understand better the situation, if the detector will be ready in 2006 and the scanning power will be adequate we should make the case to have high priority and get as much beam as possible in the first two years to increase the impact of our result with respect to JHF.