Mitglied der HelmholtzGemeinschaft Cryogenic facility for the PANDA

Mitglied der Helmholtz-Gemeinschaft Cryogenic facility for the PANDA Target Solenoid (current status) 12 December 2021 | Maxim Mikirtychyants FZ Jülich / Uni Bochum

Basic facts Panda Cryogenics Requirement 17 l/hour of liquid helium for the Current leads q 21 l/hour (0. 7 g/sec) Helium gas at 4. 5 K for the Intermediate Radiation shields 38 l/h returned as STP (300 K) q designed: returned as 4. 5 K gas (easy to reliquefy) q 37 l/hour (1. 3 g/sec) to shield the transfer lines from the Control Dewar q pessimistic: returned as 300 K gas (37 l/hour liquefaction capacity) q Final choice of the liquefier type: q q L 140 type q liquefaction capacity 70 l/h (a bit less as required for pessimistic scenario) q less expensive L 280 type q liquefaction capacity 100 -145 l/h (covers all possible losses and even more) q more expensive 12/12/2021 2

Status of liquefaction plant for PANDA Budget proposal from Linde Kryotechnik AG: ~1. 2 kk€ Delivery time approximately 11 -12 months 12/12/2021 3

Requirement for HESR compact platform (~5 x 5 m 2 ) q q movable by crane If magnet has to be operated at the “parking position”: 12/12/2021 q Space in the hall q Flexible or alternative transfer line 4

Preliminary layout Typical plant layout (from the Proposal) Compressor, pure gas buffer and line dryer may stay separately q q Reduce size of the platform (2 x 3 m 2)? 12/12/2021 5