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Vacuum system for the AREAL linear accelerator

Vacuum Systems A.Gevorgyan

Table of contents

• Design• Fabrication• Vacuum assembly• Control system• Test -stand

Design

Vacuum system in AREAL linear accelerator will be designed as an ultra-high vacuum system ,thus is means that the selected materials,device and components must satisfy this criteria:

• oil-less pumps• surface treatment low outgasing rate• construction solutions• materials The design goal of vacuum is an average preasure

10-9 mbar.

Accelerator 3D model

Fabrication Vacuum chamber will be fabricated from AISI 316-L steinless

steel.All chosen devices and hardwares,will be from steinless steel

316-L or 304, i.e (valves,flanges,belows,bolts).Vacuum chamber sectors will be joined togather with CF

flanges(2”) .

Vacuum assembly

Vacuum pump down will be done using portable TPS turbopumping system with integrated scroll pump,that can be wheeled to any area.Ultimate pressure 10-9 mbar.

Base Pressure 1X10-9mbar(*)(CFF Flanges) – 1X10-8mbar (ISO Flanges)

Pumpdown Time (14lt volume) 80sec (100mbar); 110sec (10mbar); 155sec (10-4mbar); 400sec (10-5mbar)

Start-up Time 15sec

Operating Position Any

Operating Ambient Temperature 5oC to 35oC

Input Voltage and Frequency 115Vac 60Hz or 220-240Vac 50/60Hz

Maximum Input Power 260VA

Bakeout Temperature 120oC at inlet (CFF Flanges) – 80oC at inlet (KF/ISO Flanges)

Communication RS232 – Analogical I/O

Weight 16.7Kg (36.8lbs)

Each dipole magnet chamber will have a port for Ion pump and approximately the straight sections too. Ultimate pressure for this pumps are 10-11mbar.They are monitored and operate via dual controllers. Operating voltage 7kV.

pumping speed 55 and 65 litr/sec

Gate valves will be used to divided the main sectors,one of them for the electron gun protection will be fast closing(0.5-0.7)msec.Operating air pressure for valves are 5-8 atm.Open and close time 1.5-2 sec.

Angle valves will be used for changing the pumping direction .The all valves are CF flange typecopper seals UHV.The operating of vacuum valves will be done with local control

system .There will be total 2 gates and 1 angle valve for the system.

Each sector of vacuum system will have one measuring array ,including Pening and Bayard-Alpert gauge allowing preasure measurements from atmospheric pressure down to 10-10 mbar.The all gauges monitored and controlled via multigauge controller.

B-A gauge installed to the system with CF flangeUHV.

Control system

Test –stand

THANK YOU FOR ATTENTION