1 / 6

5K-shield Webex Meeting

5K-shield Webex Meeting. Norihito Ohuchi KEK. Cross sections of the cryomodules.  863.6. 965.2. Model without 5K thermal shield. TTF III. Same cooling pipe scheme Only removing the 5K shield plate The cooling channel at 5K is used for heat sink of thermal anchor.

conan
Download Presentation

5K-shield Webex Meeting

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 5K-shieldWebex Meeting Norihito Ohuchi KEK ILC Cryomodule&Cryogenics Mtg (Webex)

  2. Cross sections of the cryomodules 863.6 965.2 Model without 5K thermal shield TTF III • Same cooling pipe scheme • Only removing the 5K shield plate • The cooling channel at 5K is used for heat sink of thermal anchor. ILC Cryomodule&Cryogenics Mtg (Webex)

  3. Study items in the cryomodule design without 5K shield • Optimized thermal balance in the cryomodule without 5K thermal shield. • Operation cost of the cryogenic system with the optimized temperature conditions. • Cost effect on the component and assembly of the cryomodule. • After confirming the superiority of the design without 5K shield, the detail thermal calculation and redesign of the pipe size will start. ILC Cryomodule&Cryogenics Mtg (Webex)

  4. 5K shield thermal calculation at the first step-1 • Thermal calculation model • IFNF-Milano: TTF-III cryomodule by ANSYS • KEK: STF cryomodule (thermal design is almost same as TTF-III) by ANSYS • For the 80K thermal shield and 5K thermal shields,the heat loads on the two shields can be calculated with the area of the thermal shields by the experimental data. • Intensities of heat input on 80K shield and 5K shield with MLI of 30 layers and 10 layers are 1.0 W/m2 and 0.05 W/m2, respectively. • The requirement of ANSYS calculation is only for the heat load on the 2K components. • By ANSYS, the thermal calculation with multi-layer insulation is not feasible. We assume the cold surface which has a reflection coefficient of SI (like one-layer SI). • In the LHC dipole cryostat, the radiation screen by SI is used. If the 5 layer radiation screen is used in the actual system, this calculation result will be a margin for the cryogenic system. • For this calculation, the detail model of helium vessel will not be essential. KEK will use the cylinder model for the cavity package. ILC Cryomodule&Cryogenics Mtg (Webex)

  5. 5K shield thermal calculation at the first step-2 • The calculation results should be compared with the present estimation for the ILC cryomodule heat load by thermal radiation. • In the case without 5K shield, temperature of the thermal shield should be the parameter of the calculation. Then, the shield temperature will be changed from 80 K to 40 K with 10 K steps. • For the heat load on the shield with MLI, we need investigation on temperature dependence of the cold surface from reference papers. If we do not have proper experimental data, we have to introduce some assumption on the model. • With calculating the problems of thermal shields, we have to consider the effect on the thermal anchor. The temperature of the thermal anchor will change for the one shield model. Especially, the effect on the input coupler and current leads are important. • The calculation results of KEK model and TTF-III model should be compared. ILC Cryomodule&Cryogenics Mtg (Webex)

  6. Calculation results (preliminary) • Conditions for thermal calculation • Warm wall • Emissivity: 0.2 • Temperature: 20K, 30K, 40K, 50K, 60K, 70K, 80K • Area: 14 m2 • 2K wall • Emissivity: 0.03 • Area: 9.8 m2 Calculation by Xu QingJin ILC Cryomodule&Cryogenics Mtg (Webex)

More Related