Incorporating Various Insertion Devices into the
NSLS II Storage Ring
April 1st, 2014 Prepared by: Charles Hetzel
Outline
Facility overview
Insertion device description
Installed devices
NEG coated chambers
Upcoming devices
Instrumented rf bellows
SR injection straight
1- Accelerator Tunnel
2- Experimental Floor
3 - 200MeV LINAC
4 - Booster (C=158m)
5 - RF Building, liquid He Plant
6 - Service Buildings
1
2
3
4 5
6
6
6 6
6
Facility Overview
Nominal energy: 3GeV
Nominal current: 500mA
30 cells (DBA) in 5 pendants
Ring circumference: 792m
Long straight section RF gate valve
Typical Cell Layout
S3 Dipole
S4 Multipole S5
Dipole
S2 Multipole
S6 Multipole
ID photon extraction
Dipole and 3PW photon extraction
3 pole wiggler (3PW)
Each section of the cell is composed of girders assemblies.
3 focusing and 2 bending segments (DBA). Alternating long and short straights (9.3m and 6.6m).
Photon extraction takes place at S3 and G6.
The ring is divided into 60 vacuum sections. Sectors can be isolated with RF gate valves. Design pressure (beam on): 10-9 torr.
Fast corrector
Short straight section RF gate valve
Planned Insertion Devices at NSLS II
Damping Wigglers (DW)
3 straight sections (6 devices total).
Narrow gap (11.5mm x 60mm) aluminum chamber.
NEG coated.
Elliptically Polarized Undulator (EPU)
1 straight section (2 devices total).
Narrow gap (8mm x 55mm) aluminum chamber.
NEG coated.
Flat wire correction coils on chamber.
In Vacuum Undulator (IVU)
4 straight sections.
Short (1.5m) and long (3m) devices.
Large removable side cover.
Damping Wiggler Straight Section
Space available in long straight: 8065mm.
Length of each chamber: 3775mm.
Internal aperture: 11.5mm x 60mm.
NEG coated chambers.
Installing and Baking the Chambers
Floor layout and prep
Stand installation
Survey stands
Grout stands and plates
Chamber installation
Chamber survey
Vacuum connections
Leak check
Bake out and activation
Resurvey chambers
Clear area for DWs
Test Data Supplied by Vendor
NEG Activation Profile
Initial Results
Base pressure after first activation was low 10-9 torr. (6 hr soak time)
Base pressure after second activation mid 10-10 torr. (No bleedup)
EDX of BPM blanks did not match coupon data supplied
* Normalized included oxygen @ 12%
Ultimate pressure no better then uncoated narrow gap chambers.
Chamber Ti Zr V
1* 25 16 47
2 0 0 0
3 31 16 53
4 28 15 56
Activation Test Preformed on Single Chamber
Temperature vs. Pressure Plot at Activation
Arrival at the Service Building
Transport through the tunnel
Device Installation Around Chambers
Device Installation Around Chambers
EPU Straight Section
Space available in short straight: 5359mm.
Length of chamber: 4891mm.
Internal aperture: 8.0mm x 55mm.
NEG coated chamber.
EPU Straight Section
Test Data Supplied by Vendor
Flat Wire Correction Coils
20 conductors with individual power supplies.
Dimensions:2mm x 0.2mm x 2100mm.
Max correction current: 3A.
EPU Insertion Device
1.5m IVU Straight Section
Two 1.5m devices installed in short straight.
Canting angle: 2mrad.
NEG cartridges (D3500 x 2) and ion pumps (150 l/s x 2).
1.5m IVU
Rectangular Side Port
Vendor Supplied Bake Out Equipment
Heater tapes used on chamber and bellows.
Hot water circulated magnet girders during ramp up.
Magnet girders cooled when necessary.
3m IVU Straight Section
Single device installed in short or long straight.
Two suppliers.
NEG cartridges (D3500 x 4) and IPs (200 l/s x 2) or TSP (3X) and IPs (200 l/s x 4).
3m IVU
Temperature Instrumented Bellows
Temperature Instrumented Bellows
Complications
Small gaps due to surface finish
Different material
Material plating
Surface contact pressure
Additional thermal resistance at each interface.
Temperature Instrumented Bellows
Temperature Instrumented Bellows
Storage Ring Injection Straight Section
Four pulsed magnets with ceramic chambers.
Vacuum sector includes part of BST line.
Multiple water cooled apertures to protect components from SR radiation.
Storage Ring Injection Straight Section
Roll mechanism to adjust level of ferrite during operations.
TSPs and ion pumps installed in spool pieces.
Storage Ring Flag
Multiple position to see the injected or single turn beam.
RF shielded when in parked position.
Bake Out and Conditioning
Bake out temperature limited due to delicate components.
Hot nitrogen gas used to heat internal surfaces of septum and ceramic chambers.
Linear bearings on SR flag could not exceed 80°C.
Additional bake out interlock on septum knife temperature and SR flag body.
Gas flow on branches was balanced using RAV on exit ports.
Nitrogen purge was only run attended during the day, static bake at night.
Current pressure: 2.5 e-10 torr.
Bake Out and Conditioning
Gas Inlet Gas Exit
Thank you for you attention!
Questions/Comments?
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