R&D (Cryogenic)
RishabhBajpai - 15:57, Wednesday 10 April 2024 (3526)
Vacuum Fittings

Overview: I modified the vacuum connections around the TMP. 

Before: The TMP is located at the bottom of the cryostat with a gate valve and 6-way cross fitting in between. The cross fitting has CF (-250?) flanges on either side with four "KF ports" on the cylindrical body. The "KF ports" are located after the gate valve. The outlet port of TMP is KF16 and connected to a "KF16-KF25 adaptor". This adaptor is connected to a "Right angle valve", which is connected to a "KF25 TEE" fitting. One end of the "TEE" fitting should be connected to the scroll pump with a flexible vacuum hose. The other end of the "TEE" was attached to one of the "KF ports" with another "Right angle valve". The remaining "KF ports" had a vacuum gauge, a Swagelock poppet check valve and an inlet valve.

Changes: I replaced the swagelock poppet check valve with a blank flange. Furthermore, the "Right angle valve" on one of the "KF ports" connected to the "TEE" with a flexible vacuum hose was removed and replaced with a blank flange. The "Right angle valve" was connected to the "TEE" with a "KF25-Swagelock adaptor" connected to the other end. This adaptor will be used to inject Helium during warm-up.

Items: For this work, I brought the following items from TAMA: 2*KF25 Blank flanges, 3*KF25 hinge clamps, 5*KF25 O-Rings and 1*KF25 full nipple fittings. Additionally, the "KF25-Swagelock adaptor" was brought from KEK.

NOTE: I noticed the KF16 outlet port was not tightened. I tried to tighten it, but it was still loose. Not sure if this is normal.