PQB Meeting January 17, 2019

We will meet in TEDF 2559 Thursday January 17 at 4:00 pm EST.

For those calling in we'll use the Blue Jeans [1] audio conference system.

Phone number: 1-888-240-2560
Meeting ID: 3528502673#
Meeting URL: http://bluejeans.com/3528502673

Agenda:

1- RTP cell installation in 2019 Winter SAD:

Installation Summary

Hall A IA disconnected, Hall B/C IA connected

Upcoming Beam Study Opportunities

Measure Hall B polarization at Mott (2h, FC2)

Measure Hall B charge asymmetry before/after chopper, set S2/RHWP for IN/OUT, compare Mott/Parity DAQs BCM0L02 (2h, FC2)

Measure Aq widths on charge asymmetry from freshly activated photocathode (1h, FC1)

Test RTP position difference control (8h, FC2)

Study etalon effect vs. pulse shape (8h, FC1)

Charge asymmetry pickup studies w/ PC off (2h, stable beam)

Test helicity magnets (4h, ILD)

Future Developments

DAC (16 bit, 10V)

Riad, are you concerned about noise on DAC signal?

John suggests we can configure RTP DAC to be 0-5V (or we can clamp DAC)

PS

John suggests analog isolation at PS input

Ensure internals are isolated, so no worries if chassis grounded

DAC inputs only (no POTS)

Re-use same HV blocks in present system

Longer high voltage cables

Dragon Switches

New board beside mount, retain short cable lengths

Incorporate dragon driver on to board (rather than separate)

Incorporate two diodes w/ adjustable voltage (like present driver), use clear panel or consider photodiodes to electrical to see all at once

Incorporate RC time constant, by the cell

Quick connects from cell to driver + a ground (8+1) possibly safe banana plug

2nd Cell

Asked Raicol if possible for longer or face cut crystals

Most parts arrived, will unpack at UITF laser room, see what we're missing

Install thorlabs driver on new PC

Consider inverting remote vertical driver to retain spring force

New RTP EDM screen

2- 2019 CEBAF Schedule

Spring run (now... April 7)

SAD Bubble run

Installation April 8-15

Run April 16-30

SAD Laser Room opportunity (May 1 - Jun 2)

PREX Run (Jun 3 - Aug 11)

SAD (Aug 12 - Oct 24)

install 200 kV electrode, commission