COLD WP05 feasibility analysis

Monday Feb 9, 2026, 1:00 PM → 7:00 PM Europe/Paris

meeting WP05 analysis

Thierry Brochard
Marc Dubrulle
Benoit Joly
Alessandro D'Elia
J-L Revol (remote)
Qin Qing (remote)
Simon White (remote) 

Solution A (Oct 2028)

JLR prefers. 
need spares, maintenance. benefit from present installation. More long term solution.

possible to speed if allow coactivity

 

Solution B (April 2028)

ADE, MD, for this solution

 

ADE initially, requested for completely separated solution
MD better to separate. can work with the two

ADE think before next step. Water arrives on the other side of the wall. All the water arrives on the tunnel side today. 
Will connect from the roof. 
MD: would be better to go from inside the tunnel.
BJ: avoid waveguides? 
MD: no, water is on the floor. 
BJ: could be doe becose it is less busy on that side of the wall. 
ADE: discuss crane with Yann.

JLR why not going insside booster tunnel
MD: could pass pipes in the linac tunnel
TB: not easy in the booster

TB: solution B will have source of vibration close to the ALGE tunnel. 

BJ: container can all be removed. the 4 left are used by TID. The CSE ones are CSE ASD. 

MM: Sizing of water cooling for 6GeV. NO. 

Water cooling is for COLD 300MeV operation. and eventually to use it for operation. 

JLR: 

MM: easier to have independent set up (solution B)

ADE: with solution B he can provide for COLD but not for Phase 3 (beam in SR) 

MD: need to recalculate the flow correctly. F.Favier. 
In the future the linac group will have less water flow (for section 1 and 2 two separated circuits) all the linac group can be removed to let more water. 
Only 2 RF units needed

ADE: main water consumption comes from the magnets. 

modulators considered operational all time full power. 
peanuts compared to magnets.

JLR: why separating?

MD: if more water needed, why not separating the systems. 

SRE netweork intervention, O2 in SRE network and pollution. will limit the intervention. Ph moving, dissolved oxygen. Reason to separate. 

MD: in the future the linac cooling system is going to use less power. SRE for RF units. 

present linac water cooling, would have enough flow for 2 additional RF 

Much better spennt monney to invest in setion 1 and 2 independent cooling and use the present installation to feed COLD. 

So no solution A , no solution B, but a new cooling for the present linac. 

if flow present is enough 

We have to find the values of the present water flow and what would be the numbers once the linac section are cooled individually. 

FFavier said to ADE that they are alaready at the limit. 

MB: normally decrease will happen.

in case soltion 0 does not work. What to do?

For the RF-Gun, chiller. only RF units and magnets will be on separated water cooling. 

SW: may desing a magnets with small chamber . This may enanche the field, and thus reduce the water consumption for the magnets. 

JLR: look at capacity and consumption for TL1 to compare. 

SW: could install permanent magnet as well. 

JLR, also dipole could be smaller gap. 

Solution B is assumed as best option if Solution 0 is not possible.

300l LN2 biggest tank. 

before having something cold in the cryomodule. 

Takes time to fill and loose between transfer. 

We can ask Bernard Pellisier if possible to 

need to have connection point to fill dewar. induced handling with forklift

need to have someone able to test. 

Keep 2 dewars for LN2.

form Phase 2 will ask for external space with dedicated tank. 

SF6 to be added to document. local installation.