Run Meeting: March 5th, 2018

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Daily Run Meetings

4:00PM Run Meeting, Counting house meeting room (200C)

RC: Carlos Ayerbe

Summary of past 72h:

Accelerator

7:30 - ARC magnet issues causes the beam to be off. Same problem was reported last Wednesday. ---> https://cebaf.jlab.org/dtm/open-events?event_id=3456

Friday March 2nd

Swing shift

data production

Saturday March 3rd

Owl shift

data production

00:50 beam off ~1.5h due HPA water problem

Due to a misunderstanding in the crew, two runs with H2 were taken instead of He3.

Day shift

data production

09:27 Beam to the Hall off ~1.5h due to Beamstopper A-chain dropped ---> https://logbooks.jlab.org/entry/3541990

Swing shift

data production

19:50 Raster X power off ---> https://logbooks.jlab.org/entry/3542196

20:40 Bill Gunning enter under control access to repair. 24V power supply replaced ---> https://logbooks.jlab.org/entry/3542226

~2h without production.

Sunday March 4th

This day we dedicated to take H3 and He3 data in exclusive until obtain ~30k good electrons at each target.

Owl shift

data production

Day shift

data production

Swing shift

data production

Beam quality degrading along the shift.

21:40 1L24 SEL Quenches and 2L09 dropped HV. Beam off for 3h.

---> https://logbooks.jlab.org/entry/3542772

---> https://logbooks.jlab.org/entry/3542778

Monday March 5th

Owl shift

Change of plans!!!

All the time schedule is moved one hour late in order to allow Hall C finish a kinematic point before change polarity with control access.

Hall A and B entered in controlled access early (9:00) so we didn't run parasitic runs.

9:00 Beam Studies (+1h)

Parasitic data (No Hall A)

11:00 Controlled Access (RadCon requested at 9:00)

LHRS Polarity changed

Vacuum minor inspection

Walk-through

Day shift

LHRS positrons data

RHRS data production

DATA Status

Round IX. Column 27/(24+4).

Good Electrons LHRS: He3: 30.3k; H3: 30.7k; D2: 29k

RHRS: He3: 37.4k; H3: 16.6k; D2: 15.6k

Plan:

-Changing LHRS polarity

-measuring positrons (LHRS)

-Normal running RHRS

Total: two shifts.

EXTRA:

Tuesday RF Recovery

Start 8:30

Ends 12:30

Slides

Tritium elog: https://hallaweb.jlab.org/dvcslog/H3/

BlueJeans connection info:

To join the Meeting: https://bluejeans.com/372278653