Agenda

Minutes

Present: Igor, Tim, Moskov, Beni, Sashi, Marshall, Eugene, Richard

Eugene announced that the capital budget funding is frozen until March until the source of SOLID funds is understood. If capital construction budget is used for SOLID, that would mean about factor of two reduction of capital funding rate for other projects.

The next run (after the spring run) will be in the fall of 2025, not in winter of 2026. It will end sooner.

Richard was busy with exam work. Meanwhile, the university IT division delete his file by formatting the disks. Richard has backups of his data from GEANT4 simulations, and he is recovering it. Richard may have plots next week.

Hovanes performed thermal analysis for the FLUKA data with AC tungsten and with 20% radiator that Pavel showed last week. The analyzed data had AC inside the photon channel of KPT. Hovanes did analyses assuming both water cooling and air cooling of AC. For water cooling scenario, Hovanes considered both isotropic and anisotropic material for Boron Nitride cup of AC. Richard thinks that the cup is isotropic since it does not feel like a crystal but feels like ceramic.

Water cooling analysis showed that the tungsten temperature will be fine, below 100 degrees Celsius, if cooled through the outer edges of the BN cup.

Air-cooled analysis shows that the temperature of the tungsten may reach 450 degrees Celsius, and aluminum plate may reach 400 degrees.

Richard pointed out that having solid tungsten blocks instead of pins with a base may overestimate the power deposition in the pins by about a factor of 4. So, the temperatures shown might be overestimated. Hovanes mentioned that because of the relatively coarse binning of the power deposition in the AC, some of the power was not included in the volume of AC in the thermal analysis, thus slightly reducing the temperatures.

Hovanes' conclusions were that AC temperatures would be fine if water-cooled, and we may have problem if cooled by forced air.

Richard mentioned that many components of KLF active collimator have already been manufactured.

Hovanes also checked the W-plug and Be-target temperatures with the new map. The temperatures were similar to those found from simulations without AC tungsten.