-Rather smooth running of polarized Deuterium over last night, spin angle
32 degrees. No results presented yet.
-Around 8pm last night and 8am this morning, sudden drops in the beam
intensity were observed. This morning, these drops became more frequent,
and disturbed the experiment too much (accompanied by HV trips).
-Beam was given to CCR for investigation. However, effect disappeared by
itself until 11am. Suspected that some device in the ring causes short
kicks to the beam. Steering coils are ok. Target is excluded to be the
cause (V14 closed). Maybe the LICs.
-Then at 11am power overload problem in the D-tunnel arised. Some
transformer limit of 50kVA was exceeded. The present quick solution has
been to increase that limit to 60kVA. A replacement power transformer for
75 kVA is on the way.
-As a consequence of the power problem the control units for ABS developed
a problem. A PID control unit of the active tuning did not come up
properly. This problem has been fixed by 4pm.
-Beam is now on and experiment running again.
-Plan for tonight: Continue running polarized Deuterium. Possibly around
8 pm/am sudden beam intensity drops may be expected and should be
investigated by CCR when they start to occur.
-The person on shift should be awaware of who is the run coordinator
(=default contacts person).
-Shifts crew tonight and tomorrow:
17-1 tavi
1-9 nikolas
9-17 ajmasch
Regards,
Michael
--+-------------------------------------+--------------------------+ | Office: | Home: | |-------------------------------------|--------------------------| | Dr. Michael Kohl | Michael Kohl | | Laboratory for Nuclear Science | 5 Ibbetson Street | | MIT-Bates Linear Accelerator Center | Somerville, MA 02143 | | Middleton, MA 01949 | U.S.A. | | U.S.A. | | | - - - - - - - - - - - - | - - - - - - - - -| | Email: kohlm@mit.edu | K.Michael.Kohl@gmx.de | | Work: +1-617-253-9207 | Home: +1-617-629-3147 | | Fax: +1-617-253-9599 | Mobile: +1-978-580-4190 | | http://blast.lns.mit.edu | | +-------------------------------------+--------------------------+
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