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Dear TRIUMF Users, Experimenters, Operators and Staff,
<br>
<br>
This is to update you on the current situation with ongoing repair
in Beam Line 1A (BL1A), and the impact on <a
href="https://mis.triumf.ca/schedule/view?schedule=119b&revision=ACTIVE">Schedule
119b</a>.
<br>
<br>
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).
<br>
<br>
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.
<br>
<br>
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.
<br>
<br>
Thank you for your patience.
<br>
<br>
Sincerely,
<br>
Jens Dilling
<br>
<pre class="moz-signature" cols="72">--
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</pre>
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