G5 Beam Line Vacuum System

G5 Beamline Vacuum System Design Bakeable and Particulate free to Class 100 Clean Room quality

• Require Clean room QA and processing, and special clean room installation techniques• Some of the required techniques have been performed for 5-cell bakeout and CET.• Support, bellows and clearances designed to accommodate thermal expansion from bakeout

Target e-gun exit pressure goal of ~10-11 torr• Protect against poisoning of advanced cathode designs• Adopt Pumping system design planned for ERL zig-zag injection beam line• Achievable for beamline proper with bakeout, uncertainty associated with beam component gas

load

G5 Injection Chambers w/ circular aperture similar to Loop Quad Chambers• Stainless steel tubing as opposed to inconel construction in B field• Bellows are not rf-shielded, except laser/ion-pump cross is rf-shielded, capacitive short design• Bakeable to 250ºC, except BPM blocks (150 ºC Vacuum Seal Limitation)

Use of vacuum components intended for ERL zig-zag injection line and ERL loop where appropriate

• HOM Damper• Laser/Ion-pump cross• Ion pumps and supplemental vacuum pumps• ERL Triplet Chambers

G5 Injection Beamline Vacuum Process

RECEIVE INSPECT PARTS MATERIAL

ASSEMBLE

TUNE

DIS-ASSEMBLY

CLEAN ASSY AREA, TECH BENCH

TECHNICAL GROUP LAB

PRE CLEAN UHP N2 BLOW-OFF

UHP FILTERED N2 SCRUB, CONTINUOUS PARTICLE COUNTING

UHV LEAK TEST & OUTGAS, RGA

VENT UHP FILTERED N2

CLEAN ROOM ASSEMBLY

CAP, SEAL BEAMLINE FLANGES

CONTROLLED BUFFER BLDG TYVEK TENT, HVAC, FLOOR PAINT, DUST CONTROL MEASURES, etc.

PRE-INSTALL MECHANICAL

CLASS 100 CLEAN ROOM

STORE FOR ERL INSTALLATION

912 INVENTORY

INTERCONNECT BEAMLINE IN PORTABLE TENT UHP FILTERED N2 BEAMLINE

PURGE

BAKEOUT BEAMLINE EQUIPMENT TEST &

COMMISSION

ERL FACILITY

MACHINE/ FORM

UHV PRACTICES WELD

FINAL MACHINE

STRESS RELIEF

CLEAN

MACHINE SHOP

PRECISION CLEAN WET PROCESS if nec.

UHP N2 DRY & BAG if nec. NEW INST.

EVACUATE BEAMLINE SECTION & VACUUM LEAK

TEST

VAC. FIRE if necessary

INSPECT

UHV CLEAN

INV.

PRE-CLEAN

TEST*

* System, Vacuum

UHV COMPATIBLE

UHV PRACTICES

G5 Beamline Vacuum System Status

G5 Vacuum Beamline Components in BNL Inventory• Triplet ERL Loop Chambers• Laser/Ion Pump Cross• High Order Mode Damper Ceramic• Large Low profile 150 L/s Ion Pumps and Supplemental Titanium Sublimation Pumps• Small Shielded 25 L/s Ion pumps• All components must be processed through the clean room

Several G5 specific chambers remain to be fabricated and processed.

All Beamline instrumentation to be vacuum and clean room processed• QA and/or particulate free processing as required.

Estimated material cost to complete G5 beamline vacuum system: ~$90k • Chambers and other beamline components ~$35k.• Bakeout jackets and other bakeout related material ~$20k.• Beamline Installation Support Equipment ~$5k • Additional clean room processing (recommended) ~$13k• Controls, including PLC components, cables, connectors ~$16k• Excludes costs associated with pressure relief