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Dear TRIUMF Users, Experimenters, Operators and Staff,
<br>
<br>
This is to inform you that we have two changes to Schedule 119b for
the ISAC operation;
<br>
1) concerning cyclotron RF technical issues and change of
maintenance day and schedule impact for July 11 & 12, 2011; and<br>
2) new schedule for running period July – August 2011, and plans for
September UCx run
<br>
<br>
<u><b>For 1)
</b></u><br>
Due to some RF issues for the cyclotron and associated repair, a
decision was made to push forward tomorrows (July 12) maintenance
day to today (July 11). Moreover, beta-NMR will continue to run
tonight (July 12 pm-shift) and start up for HERACLES S1067 will
begin July 12 am-shift. The changes are reflected in the on-line
schedule.
<br>
<br>
<u><b>For 2)</b></u><br>
A decision concerning the technical issues with TM1 and the
corresponding changes has been made and we have been informed by the
Accelerator Division about status and plans (see detailed
Accelerator Division Statement below). The following changes and
consequences arise for the schedule:
<br>
We have cancelled the Nb-target run and will operate instead a low
power Ta target. We will be running for an extended period of 5
weeks to allow for time in between to repair TM1, load it with a
LPTa target, install it on-line, and test it with protons. After a
successful test, we would pull it out, and prepare it with a UCx
target, to come back for operation September 1, 2011. Before and
after the TM1 on-line tests we would do experiments with TM4. Some
changes for experiments have occurred, please check the on-line
schedule for the relevant changes.
<br>
<br>
The operation of the UCx target remains a laboratory priority,
however, the planned operation of the UCx target depends on
successful tests of TM1. Once this is verified we will be able to
schedule experiments with a UCx target starting September 1, 2011.
In this case, we will be running with this target until September
26, 2011 (hence postpone the cyclotron and ISAC shutdown by ~ one
week). <br>
<br>
If TM1 can NOT be tested successfully, we would use TM4 for the UCx
target. In this case we would extend the LPTa run (presently
starting July 27) to operate until ~ September 9, 2011. We would
then go into shutdown (hence earlier then planned). After the
shutdown, we would come back for operation October 5, 2011 with TM4
UCx operation. For now, no experiments with UCx are reflected in the
on-line schedule. Once the situation is clear, the on-line schedule
will be changed.
<br>
<br>
I apologize for the inconvenience and appreciate your patience while
we are repairing the system to provide you with the best
experimental conditions. I promise to maintain full transparency of
the process and thank you for your understanding.
<br>
<br>
Best regards,<br>
Jens Dilling
<br>
<br>
<u><b>Accelerator Division’s statement:
</b></u><br>
During pre-installation tests with TM1 in the new ISAC conditioning
station problems were encountered in reaching the goal of 60kV.
Tests indicated that there were small leaks in some of the water
circuits. Further tests localized the leaks to several transition
joints. A plan has been adopted to re-engineer the joints and
drawings have been issued to the shop as of July 8. The shop has
been instructed to deal with the fabrication of the required parts
at high priority. Nonetheless the fabrication and testing of the
re-engineered parts will take time. The highest priority is to
determine the integrity of TM1 under beam conditions prior to the
next UCx run. To this end we are proposing to refurbish TM1 with the
re-engineered joints, outfit TM1 with an LPTa target and install
on-line to test the module under real operating conditions. The
target and ion source group have established an aggressive schedule
with installation of the module planned for Aug. 3 and test with
beam from Aug. 11-13. We feel this plan gives us the best chance to
confirm the integrity of TM1 before the next UCx run scheduled in
Sept.
<br>
<br>
Thanks for your support,<br>
Bob Laxdal
<br>
<br>
<a href="https://mis.triumf.ca/schedule/view">https://mis.triumf.ca/schedule/view</a><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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