Sumitomo RDK-415D User Manual

He-Compressor and Cold-Head Service
The AMI magnet (6T) in Osujilab is cryo-cooled by continuous Helium supply by a Sumitomo Compressor
operating at a pressure of ~2.2 MPa. The superconductor in the magnet is cryo-cooled by a cold-head
(Sumitomo Inc.) attached to the magnet. Continuous Helium supply is necessary to maintain the
superconductivity in the system. There are two flux lines (supply and return), 6m long connecting the
He-compressor and the cold-head. The flux lines, cold-head and the compressor have self-locks to
isolate them to avoid contamination. When flux lines are disassembled from the cold-head or He-
compressor the locks will automatically be locked. When the pressure in the He-compressor goes below
1.6 MPa, the compressor should be re-filled with Helium (UHP-300, 99.999% purity). Please follow the
instructions before start refilling the He-compressor. If the He-compressor or flux lines are
contaminated, the pressure reading in the He-compressor will drop (usually it will be zero), also when
the He-gas leaks out of the system. Once the system is contaminated, it is advised to get in touch with
Sumitomo Inc. to do a cleaning service.
Figure1: (a) Zero pressure reading due to contamination of the system. In this case the He-gas was escaped through
accidently loosened screws (b). During operation the pressure reading is about 2-2.2 MPa. However, when the He-
compressor or is switched off, the pressure reading is non-zero (~1.6MPa). If the compressor pressure reads zero, it
would not re-start.
Chilled-water supply is connected to the He-compressor to dissipate the heat from the return supply.
When the temperature of the chilled-water supply rises, the He-compressor might shuts down
automatically, and subsequently the magnet temperature will rise. Sometimes, the main power-supply
switch at the back panel will turn off by itself. Then it has to be turned back on as shown in Figure 2.
Most often, switching OFF the drive switch and turning back ON will resume the He-compressor.

Sumitomo RDK-415D Specifications

General

Brand	Sumitomo
Model	RDK-415D
Category	Industrial Equipment
Language	English

Summary

He-Compressor and Cold-Head Service

Service Details and Contacts

Contact information and tasks for He-compressor and cold-head servicing.

Gas Lines Technical Manual

Description, Specifications, and Tools

Overview, technical specs (bend radius, pressure, temp), and required installation tools.

Gas Lines Maintenance and Repair

Procedures for disconnecting, leak checking, repairing, and venting gas lines.

Gas Lines Parts Information

Details on ordering and identifying parts for gas lines.

SRDK Series Cryocooler Operation Manual

Before Use and Safety Precautions

Essential safety warnings, precautions, and initial checks before cryocooler operation.

Inspection, Packing, and Return Procedures

Steps for inspecting, packing, and returning the cryocooler unit.

SRDK Series Cryocooler Overview

General information, components, and theory of operation for the SRDK Series Cryocooler.

Installation and Connection Procedures

Detailed steps for installing, connecting, and siting the cryocooler.

Operation and Functional Checks

Procedures for cryocooler start-up, shut-down, normal operation, and functional checks.

Maintenance, Troubleshooting, and Logs

Routine maintenance, troubleshooting, service contacts, and operating logs.

CSW-71C Compressor Unit Technical Instruction

General Information, Specifications, and Construction

Specs, construction details, controls, components, and flow diagrams of the CSW-71C.

CSW-71C Installation and Connections

Site requirements and power cable connection procedures for the CSW-71C compressor.

CSW-71C Compressor Maintenance

Periodic maintenance, adsorber replacement, and fuse replacement for the CSW-71C.