ISAC Strawman Schedule Survey

[Science Division Shared Account]

Dear ISAC Users,

At the ISAC Strategy Workshop in November an idea was floated to modify the ISAC schedule in 2020 to include a block of "backed up" beam time. This would be a contiguous block of a single target material and ion source combination, using a rotation of two modules on both stations. The duration would be for a few months, within which immediate recovery from module or target failure can be achieved.

The main advantage of this mode of running is that scheduled experiments will not need to be cancelled or shifted significantly in the event of a module or target failure. In addition, more breathing space is possible for the Remote Handling, Beam Delivery and Target & Ion Source groups to diagnose and repair any failure, resulting in a more careful and measured recovery. The disadvantage of this mode is that the same target material and ion source will need to be run for the duration of this period, leading to less diversity in the year.

For this mode we are considering Uranium Carbide with surface and laser ionization, with the option of graphite. The sequence of target operation inside the backed up block closely resembles that which will be required during the ARIEL era, therefore this is a useful practice to establish early on.

We have envisaged two possible versions of this schedule, shown in the attached diagrams alongside a "regular" year. The versions would result in up to 35-40% of the total years' shifts being backed up for failure, at the cost of only 5-10% of the total shifts compared to a regular year. It would allow 9 or 10 ISAC targets in total to be scheduled. Note that the nature of the two versions requires that certain BNMR blocks are scheduled at a particular time.

Users should note that the backed up mode would mean that experiments scheduled on Uranium Carbide have a low chance of cancellation due to target module failure, while all other experiments have the same chance of success as with regular operation.

We wish to solicit the opinion of users immediately. To that end here is a link to a very short survey question that we would be grateful if you could complete by Monday 20th January:
https://forms.office.com/Pages/ResponsePage.aspx?id=EDUFwrOceUai049ELgO1h2WQuVz4bnFBoS0U0OSUAw5UQVhZTzNUMlZIVDhYNlFWSzNNMThRVlVVVS4u<https://can01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fforms.office.com%2FPages%2FResponsePage.aspx%3Fid%3DEDUFwrOceUai049ELgO1h2WQuVz4bnFBoS0U0OSUAw5UQVhZTzNUMlZIVDhYNlFWSzNNMThRVlVVVS4u&data=02%7C01%7C%7Cf44d477127304971a65408d7991f7942%7Cc20535109cb34679a2d38f442e03b587%7C1%7C0%7C637146232879666308&sdata=sNfwqCk65SY%2F0dCDg4%2FmosFV5kO32bmDcn%2BXvvH0y6M%3D&reserved=0>

Thanks

Chris Ruiz and Jens Dilling

-----------------------------------------

Allayne McGowan
Administrative Assistant - Physical Sciences Division
t   604-222-7438
amcgowan at triumf.ca<mailto:amcgowan at triumf.ca>
sciencediv at triumf.ca<mailto:sciencediv at triumf.ca>

TRIUMF Canada's particle accelerator centre
www.triumf.ca<http://www.triumf.ca> @TRIUMFLab

4004 Wesbrook Mall
Vancouver, BC  V6T 2A3

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