Forthcoming work on the beam

Lau and Niels, NA62 TD meeting, 17 March 2014

Outline

• Complete the crane consolidation in TCC8

• Reinstall front-end after alignment checks

• Consolidation of T10 target• Close up roof shield above front end

of beam• New location for fast valve, move 2

magnets• Double separation wall• Temporary modifications to ventilation

system• Prepare final ventilation system

renovation• Complete vacuum• All the rest…..

Crane consolidation

The mechanical work on the TCC8 crane has been completed.

Still some remaining work on theelectrical distribution.

The crane delivery is foreseen for end March (possibly March 18th).

The new crane has no ‘guirlande’, but is powered via a rail.This makes the air separation between TCC8 and ECN3 much easier.

Quite some work depends on the availability / reliability of the TCC8 crane!

Reinstall beam front end

Due to asymmetric profiles andslightly low kaon rate, the alignment of the beam front endhas been verified in detail.This included an insert in T10.

This required dismantling of the roof shield and of the TCX dump and of the first QNR quadrupole.

Also one MTR dipole in next tothe TAX had to be turned by 180o.

The TCX and magnets have to be reinstalled, as soon as the craneis available

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K12_radi

K12_radi

Contrôle 3D (AT401).

T10 insert

At some stage…..

NowEcart Alti. : +0.16mmEcart radial: -0.25mm (coté Salève)

QNR

TCX

Both are self-aligning

Reinstallation as soon as theTCC8 crane is available again

T10 target consolidation

All the mechanical parts of the T10 target will be replaced Specification in EDMS document 1267311 The shielding itself will be preserved Replace target box with identical spare Different target materials were studied, but stay with

Beryllium Replace the T10 collimator The TBIU unit will be replaced with a new box, containing

- a BSI (Titanium foil for intensity measurement)

- Two BSPH, two BSPV (split foils)

- BBSH and BBSV (SEMP profile scanners)

- Two halo foils with slits of 145x2.5 mm (one horizontal, one

vertical)

All this will be properly aligned and tested

Close roof shield

Once the alignment of T10 and the from end is done, the roof shield will be completed

Fast valve relocation Now that we have agreed to install only one fast valve, it

was deemed to install it as far downstream as possible, i.e. just upstream of GTK3.

The 32 cm of longitudinal space required implied a displacement of the two last achromat-2 magnets by 32 cm.

The magnetswill be reinstalledsoon (requiresTCC8 crane).

Double separation wall

The order has been placed with Sarvadon. Also a separation will be made in GHN300

Ventilation system for 2014

With the double separation wall in place, the air separation between ECN3 and TCC8 should be OK, apart from leaks between the ventilation units.

CV will take care of the pressurization of the double wall. Therefore we will STOP the ventilation in TCC8 in the

technical run at the level of the double wall with dampers. This should rather efficiently stop theair flow from TCC8 into ECN3.

With those measures the operation of the ventilation system should beclose to the final version, apart from the bad shape of the ventilation units.

Ventilation system for 2015+

The study of the final ventilation system is in progress. Information will be made available on EDMS doc 1354745. Installation is foreseen during the first half of 2015, before the

start of the 2015 physics run.

Remaining work on vacuum system

The beam line vacuum remains to be remounted and leak tested, following the various modifications.

The control is being implemented by the vacuum group The expansion vessel next to the RICH remains to be connected. The blue tank vacuum is on track. The planning for commissioning

is tight due to late closing of the tank (detector arrival) and one should be aware that commissioning can take more time e.g. in case of leaks. As discussed before.It is important to close the tank as early as possible.

Planning:Pumping test for K12, leak test, final test of control system (probably) fits with NA62’s proposed vacuum test in July - August 2014. Performed jointly by EN/MEF and TE/VSC (knowledge transfer).Final test with full gas load = pumping before & during physics run.Will be executed by EN/MEF, but under the expert eye of TE/VSC.

Other issues The GL vs I curve of QNL magnets will be measured and parameterised.

This should lead to an even better understanding of the optics of P42 (and K12). We have also a better understanding of the gradients in QNR magnets.

Understand / confirm orientation (H/V) of 4-jaw collimators. Consolidation and realignment of T4 target (late Summer).

Replace 200 mm head by a 180 mm head (slightly better for T10 flux). The gas extraction and the H2 infrastructure must be installed →

see next slide The RP monitoring system will be completed. Minor improvements to the side shielding of the K12 TAX. Install a fence at the entrance to the dump tunnel. Cesar upgrade, details still to be finalised. Not discussed here: infrastructure not directly related to beam (rack

cooling, etc)

To be updated after crane renovation in TCC8

TCC8 & ECN3 planning SBA (January)

Experimental Area Status 18L.Gatignon, SPSC112, 14-01-2014