Revision as of 16:39, 17 July 2019

In the process of editing and updating this page. Please contact Juliette Mammei crowder@jlab.org with questions or suggestions.

PREX Main << Weekly Analysis Coordinator << Instructions

July 17 2019

WAC = Cameron Clarke
Slug 3
Beam Status
- OWL had ~7 hours of beam, with some sketchy BPM noise and clear BCM DD problems
Major issue: BCM Upstairs Black box noise on AN_US

Tuning 3397 - HALOG
Charge Feedback glitch: non-fatal QW Feedback process fighting with Analysis Minder - HALOG, HALOG
OPS FFB on: for a few minutes of run 3398 - HALOG
Strange beam motion at beginning of 3398 - HALOG
BCM Noise/phase lag question: Begins run 3400, varies, investigated on scope, looks like BCM black box issue - HALOG, Sakib noted, Victoria noted
- Looked at on a scope with Tune Beam and changing all cables isolates it to a electronics/hardware issue in the Upstairs black box, not downstairs.
- This will need to be fixed, but probably the data is fine.
BPMs have strange noise, especially 4eY: Beings run 3399 - HALOG
Compliment BPMs don't have this noise (anecdotal), and their DDs w.r.t. normal BPMs is noticeable - HALOG, HALOG 2
At Left 1 is - w.r.t. At Left 2, and this isn't mirrored in Right - Devi says this is beam related, and HVs were off...
Main Detectors R vs. L correlations shift in time? -> Kent says this is normal and has to do with beam motion sensitivity - HALOG
LHRS Dipole moved a bit - HALOG, [1]

[ HALOG] - Beam Mod is OK
[ HALOG] - Aq is working, nothing more than ~0.2 ppm mean charge asymmetry over a given run, many sub 0.02 ppm

@@ Line 22: / Line 22: @@
 * Beam Status
 ** OWL had ~7 hours of beam, with some sketchy BPM noise and clear BCM DD problems
+* Major issue: BCM Upstairs Black box noise on AN_US
 == Production Run List (status at 3pm 7/17/2019) ==
@@ Line 55: / Line 56: @@
 * Strange beam motion at beginning of 3398 - [https://logbooks.jlab.org/entry/3705289 HALOG]
 * '''BCM Noise/phase lag question''': Begins run 3400, varies, investigated on scope, looks like BCM black box issue - [https://logbooks.jlab.org/entry/3705572 HALOG], [https://logbooks.jlab.org/entry/3705533 Sakib noted], [https://logbooks.jlab.org/entry/3705428 Victoria noted]
+** Looked at on a scope with Tune Beam and changing all cables isolates it to a electronics/hardware issue in the Upstairs black box, not downstairs.
+** This will need to be fixed, but probably the data is fine.
 * BPMs have strange noise, especially 4eY: Beings run 3399 - [https://logbooks.jlab.org/entry/3705575 HALOG]
 * Compliment BPMs don't have this noise (anecdotal), and their DDs w.r.t. normal BPMs is noticeable - [https://logbooks.jlab.org/entry/3705120 HALOG], [https://logbooks.jlab.org/entry/3705124 HALOG 2]