BL1A Problems - Beam Schedule 123

Science Division sciencediv at
Tue Oct 9 12:27:41 PDT 2012

Dear TRIUMF Users, Experimenters, Operators and Staff,

Due to reoccurring vacuum leak problems at the BL1A T2-M9 interface, a 
decision has been made in collaboration between the Accelerator Division 
and the Science Division, to blank-off this beamline. The vacuum leak, 
caused by an indium seal, is at this point no longer sustainable in 
terms of operation, even though we have added substantial pumping over 
the long weekend.

The blank-off procedure will commence today during the maintenance day 
and is scheduled to be finished October 24th, 2012. Beam is expected 
restored back to the beamline on October 25th, 2012.

This blank-off has a number of consequences:

  * During the blank-off procedure there will be no beam to BL1A (hence
    no experiments will be running on M9, M11, M13, M15, and M20, as
    well as PIF/NIF)
  * After the blank-off there will be no beam available for experiments
    on M9.
  * The on-line Schedule 123 will reflect the time when no beam is
    expected, and will continue with already scheduled activities once
    beam is back.

Due to this interruption of beam delivery to BL1A we are considering an 
extension of the high intensity operation, which is currently scheduled 
to end Dec 4 2012. We have to evaluate the impact on the shut down 
schedule as well on effected users, before a final decision is made.

I apologize for this interruption and please feel free to contact me for 
further details or if you have questions

Jens Dilling

Dr. Jens Dilling
Head Nuclear Physics/ISAC  TRIUMF
Physics & Astronomy University of BC
Tel/Fax 1 604 222 7413/1074
JDilling at

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