PQB Meeting January 17, 2019

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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


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, 10 V)
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)
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