1. A. Freyberg Aug 2016 ECT’16 =>

2. Injector Upgrade Project (past R100)
200 kV
Must
Increase gun voltage and Wien filters for 200kV operation
Beam line must be compatible for 200kV (PSS kicker, chopper RF)
Locate Wien (energy) filters upstream of pre-buncher cavity avert
New SRF booster eliminates capture, RF kick & x/y coupling
Other RSR groups are planning system upgrades, needs to be integrated
Should
NEG coat beam line to limit outgassing, SEY, add a little pumping
Upgrade keV quads to manage Wien and dipole focusing
Upgrade keV solenoids to address focusing gradient across chopper and beam size
Complete diagnostics to setup beam
Augment or reconfigure 0L02-0L03 section with MeV solenoids

3. CEBAF Source (2018 SAD) Status
Installed 350kV/4.5mA PS that now sits in tunnel beside Gun2 in SF6 tank
Upgraded HVPS software & PSS controls, retained capability to backout to 150kV PS
Added two new M20 style BPM’s to the NEG tube just downstream of Gun2
Replaced Gun2 electrode with one including a HV shed (made beam at 180 kV), imparts large kick to the beam orbit.
Operated new HVPS and gun successfully for Fall program but requires managing asymmetrical beam
Electrode w/ smaller shed to reduce kick designed, fabricated and being polished.
What’s next?
Commission new electrode at UITF for 200kV and beam quality, install CEBAF 2019 or 2020

4. Critical points for the baked 200kV beamline
200 kV Gun
NEG w/ BPM’s
(addressed)
New single gun Y-chamber 7.5deg
(delivered)
Repurpose Wien Filters
(next slides)
Prebuncher after Wiens
Upgrade PSS kicker 200kV
(need to help PSS group)
Retain A1/A2
(drift)

5. Upgrade plan for the 200 kV Wien filter
Wien Upgrade for 100 deg precession
Beam Voltage
keV
200.00
Integrated BL
G-cm
Magnet Current A
15.36
Electric Field
MV/m
2.67
Electrode High Voltage kV
20.05
Modify existing 130 keV Wien filters for 200 keV operation
Magnetic Field
Replace 10 A coils with 20 A coils (J. Benesch, JLAB-TN )
Replace 10 A trim with 20 A rack mount supplies
Modify steel to accept 20 A coils
Electric Field
Replace 14 kV supplies with 30 kV power supplies
Upgrade feedthroughs
Barrel polish electrodes

6. Status of 200 kV Wien Filter Upgrade
Prototype Wien filter installed at UITF
Magnetic Field
Coils fabricated but multiple iterations (shorts, tight fit), re-evaluate for final
Successfully powered to 20A (15A required for 200kV requirement)
New 20A supply at UITF (two more ordered for CEBAF), work fine
Pair 20A PS ordered for installation at ISB Summer 2019
Electric Field
Pair +/-30kV Matsusada PS at UITF w/ new software, good
Safety evaluation for x-ray potential in vacuum (60 keV)
HV design insufficient for 20kV (makes ~10 kV, FE), re-evaluate E-field design
Additional Matsusada PS + controls arrived (staged in ISB)
New racks in ISB + controls and HV swtiches at ISB by Summer 2019)
Team effort needed to complete design, demonstrate reliable operation and to improve quadrupoles to round up Wien filter optics.

7. Testing CEBAF Upgrade Cryounit at UITF
Upgrade Cryounit Commissioning at Test Lab
Spring 2017 – cryostat positioned at UITF
Summer 2017 – keV vacuum beam line connected
Winter 2018 – application of klystron power

8. Segue to Chopper, Booster and Beyond
Polarized Source Baked Beamline
Chopper
Booster
Beyond
How about we continue discussion in the following order ?
Scope of work for the Booster section
Upgrading solenoids in the chopper (extend same/similar to rest of keV region)
Augmenting MeV section with LCW cooled version of solenoid, matching to NL
The road before us requires an actionable plan (design, purchases, fabrications, tests) to successfully begin an installation and commissioning period in April 2020.