Beam Schedule Change (Schedule 119b) - update for beam in August

[Science Division]

Dear TRIUMF Users, Experimenters, Operators and Staff,

This is to update you on the current situation with ongoing repair in 
Beam Line 1A (BL1A), and the impact on Schedule 119b 
<https://mis.triumf.ca/schedule/view?schedule=119b&revision=ACTIVE>.

As you know, we had foreseen an extended shutdown period for BL1A, over 
the rest of the cyclotron-based program, due to necessary repairs. We 
had planned to start beam production August 10, 2011. However, after 
uncovering shielding and doing more detailed analysis it was discovered 
that more substantial repairs are needed than originally anticipated. 
The scope of the repair has been assessed in detail and an in-depth plan 
has been put together. With this plan, which requires extended shift 
work from the service groups, and help from all TRIUMF divisions, we are 
planning and are confident to start beam production for BL1A users 
August 19, 2011, with the possibility to provide discretionary beam 
potentially earlier (around August 16, 2011).

This is reflected in the online Schedule 119b. We currently assume 
operation with a T2 target in place, however we are considering 
operation without target (and hence no beam production for M9), as this 
would allow operation at much reduced activation of the temporary 
shielding and much reduced shielding movement. It would also provide 
possible access for the installation of the new muon channels. The 
potential benefit of this T2 target-less operation is also a much 
reduced scope of the upcoming schedule 120 shutdown and earlier beam 
production for Schedule 121. Schedule 121 will at this point be able to 
operate with the new muon channels M9 (a/b) and M20. We are assessing 
the situation and will inform you if we are making changes, hence opt 
for target-less operation.

For Schedule 120, which will run for the Meson Hall-operation from 
September 23 to December 23 and for ISAC-operation from October 6 to 
December 23, a call for beam requests will go out in the next 2 weeks.

Thank you for your patience.

Sincerely,
Jens Dilling

-- 
Miss Nicole (Niki) Martin
Administrative Assistant
Science Division

TRIUMF
Accelerating Science for Canada | Un accélérateur de la démarche scientifique canadienne
4004 Wesbrook Mall
Vancouver, BC  V6T 2A3
604-222-7438

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