[Eng-div] Fwd: CEBAF Status Update 12: Beam to Tagger Vault Dump

[Will Oren]

All, 
In case you haven't heard. Great work by all. It's sure nice when a plan successfully comes together but it would have never worked without each and every one of you doing what you do and for the most part doing it safely. 

Congrats, 

Will 

----- Original Message -----

From: "Arne Freyberger" <freyberg at jlab.org> 
To: "Hugh Montgomery" <mont at jlab.org>, "mike dallas" <mdallas at jlab.org>, "Bob McKeown" <bmck at jlab.org>, "Andrew Hutton" <Andrew at jlab.org>, "Fulvia Pilat" <pilat at jlab.org>, "rode >> Claus Rode" <rode at jlab.org>, "Allison Lung" <lung at jlab.org>, "Leigh Harwood" <harwood at jlab.org>, "Rolf Ent" <ent at jlab.org>, "rossi patrizia" <rossi at jlab.org>, "Mary Logue" <logue at jlab.org>, "Bob May" <may at jlab.org>, "Will Oren" <oren at jlab.org>, "Tim Michalski" <michalsk at jlab.org>, "Rusty Sprouse" <sprouse at jlab.org> 
Cc: "Michael Spata" <spata at jlab.org>, "Noel Okay" <okay at jlab.org>, "Paul Vasilauskis" <vasilaus at jlab.org>, "Ken Baggett" <baggett at jlab.org>, "lauze" <lauze at jlab.org>, "Bob May" <may at jlab.org>, "Kelly Mahoney" <mahoney at jlab.org>, "Steve Suhring" <suhring at jlab.org>, rmichaud at jlab.org, "Matt Bickley" <bickley at jlab.org>, "Fulvia Pilat" <pilat at jlab.org>, "Kandice Carter" <kcarter at jlab.org> 
Sent: Thursday, May 8, 2014 6:04:30 AM 
Subject: CEBAF Status Update 12: Beam to Tagger Vault Dump 

Mont and LL; 
Before the stroke of midnight last night the beam was successfully transported to the Hall-D tagger vault. With this accomplished, the beam line elements from the photocathode through 5.5 passes of CEBAF and the new Hall-D electron beam line have gloriously transported beam! The image below is the beam spot on the viewer just in front of the Hall-D dump. The camera focus is a bit off, so the image is not as crisp as most of the viewer images that have been previously bandied about. In addition to the viewer image is a screen shot of the beam position monitors (BPM) readings for the 5C line (Hall-D line). These BPMs are new to 12GeV CEBAF, new beamline vacuum component, pick-ups and electronics. The technical staff had made an educated guess at the parameters needed for these BPMs to work with beam (timing) and they got it right!! The BPMs worked on the first pulse of beam through the pick-ups. Just one example of the many things that have gone "right" during this commissioning phase. This is not luck. This is a direct reflection of the quality of the staff. 

The plan now calls for optics measurements so that we can build on this accomplishment and bridge from commissioning quality beam to physics quality beam. These measurements should be completed by noon on Friday, at which time CEBAF operations will cease until the Fall. 

Cheers! 
Arne 







-- 
Arne Freyberger
Director of Accelerator Operations
Jefferson Lab             
12000 Jefferson Avenue      Cell: (757) 876-6289
Postal Suite 19             Email: freyberg at jlab.org Newport News, VA 23606 
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