June 6, 2019 - Weekly AIPINJ Meeting

To-Do List

Layout edits for Danny...

1. Locate NEW MFA0I03/MFA0I05 CL 15.9cm from faces of chopper
2. Move the 0I05 elements downstream, then add a valve
3. After each solenoid locate a BPM with a Haimson magnet over it (let's see how well this works)
4. Remove all other corrector coils.
5. Make the viewer after the buncher the combined viewer+FC1
6. Layout A3 to Booster in this order (not on top of one another): A3, DP can, Solenoid, BPM w/ Haimson, YAO, viewer, A4
7. Set the bend angle of 1D beam line larger than 30 deg, but smaller than 45 deg...should be able to work between 1D and 0I line better than now
8. Danny to add 3" long place holder for a wien quad upstream and downstream of each Wien filter like this: quad, cross, wien, cross, quad

Y-Chamber jobs...

1. Marcy, find the y-chamber in UITF, have it degassed, recommend a pump configuration
2. Reza consider a new DS magnet that fits within L=5.25", over 3.0" pipe, that would have two 7.5 deg pole face rotations

Chopper brainstorming...

1. Reza say how far apart he'd like the chopper solenoids spaced from chopper center to minimize/eliminate B-field (helpful to say for both the 3.99" and 4.62" ID solenoids)
2. Reza say what would be a reasonable reduction in the chopper circle, from 3cm to Xcm
3. Danny consider a new chopping chamber, w/o central plug, where either four slits (A,B,C,Master) are INSERTED and at the centerline OR a viewer is INSERTED (can viewer be normal w/ mirror behind?)
4. Marcy investigate precision linear vacuum actuators...are there other options to consider?

Meeting Agenda

Beam line Magnets

• Injector Solenoids Upgrade - Three types (2.99" ID beamline, 3.62" ID chopper), under review now, w/ feedback next week
• 15 deg bend dipole - Reza wants to improve the DS magnet, asking Jay for help (want to give him OD/L of existing real estate (straight, bent)
• Eliminate MAD coils from CEBAF - CED says there are four pairs (MAD0I06AH/V, MAD0I07H/V, MAD1D00H/V, MAD3D00H/V)
• Wien Quads - should we build 4 little red quads?

PSS Magnets

• Jerry will test PSS kicker in August with 200keV beam
• Consider to replace MBO0I06 w/ larger gap 1-1/8" old DL dipole gap magnet

Layout

• Beam line chopper solenoids - locate NEW MFA0I03/MFA0I05 CL 15.9cm from faces of chopper

Chopper - What do we want to change?

• Assembly drawing media:190606_chopper_assembly_drawing.pdf

1. Improve reproducibility of slits that define the beam (A, B, C, MS)
2. Use new 3.62" ID chopper solenoids
3. Improve views creen, how? (chomox and wires, YAG and bleed coating, fiducials, Gubeli style normal w/ mirror so no aspect ratio)
4. Minimize pumping

Wien filters - We meet every other week for updates

• Gabriel is modeling new feedthrough, requiring increased nipple (bigger aperture in steel, conflict w/ coil)
• Carlos is looking for alternative feedthroughs that may be more accomodating
• Joe promised Gabriel and Carlos the EL to produce 100 deg for both 200keV and 350keV beam energies (also from Jay's excel file)