Micolon, Frederic | Search NASA

DOE OSTI2023

Design of a removable vacuum bellow restraint for RHIC vacuum vessels

In preparation for the rework of a RHIC Siberian snake for EIC, a DU7 cold section is being refurbished to replace the snake magnet before the RHIC run 25. There is a need to check the vacuum vessel leak tightness before tunnel installation, however the vacuum vessel original restraints have been removed. So there is a need to design a new removable bellow restraint for this vacuum testing. This report details the design and analysis done to ensure the safe operation of this bellow restraint.

43 PARTICLE ACCELERATORS↗

DOE OSTI2023

Thermal simulation of the HSR arc BPM Module for EIC

The Electron Ion Collider (EIC) Hadron Storage Ring (HSR) will reuse most of the existing superconducting magnets from the RHIC storage ring. However, the existing stripline beam position monitors (BPM) used for RHIC will not be compatible with the planned EIC hadron beam parameters that include higher intensity, shorter bunches, and some operational scenarios with large radial offsets of the beam in the vacuum chamber. To address these challenges, the existing RHIC stripline BPMs will be shielded, and a new BPM design using button pick-ups and integrated in a new vacuum interconnect/bellows assembly that will be installed adjacent to the existing BPMs. A thermal analysis of the new arc BPM housing and button pick-up design has been conducted to assess the effects caused by beam induced resistive wall heating and signal propagation through the button pick-up cables for several operational scenarios. This report will describe the analysis results to quantify the heat transfer and temperature distribution that can be expected on the new HSR cryogenic arc BPM housings, button pick-ups, and cryo-signal cables.

43 PARTICLE ACCELERATORS↗