Beam Delivery Report

Status reports on beam delivery at TRIUMF, and part of the Beam Delivery group's Guide for Experimenters.

Past reports can be found here.

07:43, 25 March 2010 (PDT)

All three beamlines are now online: BL1A (~105 µA), 2A (10 µA), and 2C4 (~35 µA). The beam energy in both 1A and 2A is 480 MeV. The 2A and 2C4 currents will both be increased over the next few days as targets improve, etc.

A target scan on BL2A will likely be carried out at some point today. Otherwise beam tuning is still in progress. — Morton

20:43, 23 March 2010 (PDT)

Beam is currently running down BL1A and 2C4 (~100 µA and 25 µA, respectively). The 2C4 current is limited by STF water conductivity and will be increased as that improves. ISAC is not expected to request protons down BL2A until late Wednesday at the earliest.

The cyclotron is currently delivering protons at 500 MeV. Depending on how startup proceeds, the beam energy may be reduced to 480 MeV for the start of this running period in order to test the machine stability and production yields on the different beamlines at this energy. Running at 480 MeV reduces the cyclotron spills (as the H- beam makes fewer turns at high energy) which, in turn, reduces activation due to scattered beam. If we can run at 480 MeV on a routine basis, it would reduce the fields in the vault during shutdown allowing for work to begin sooner in shutdown with less dose to those doing the work. — Morton

16:17, 18 March 2010 (PDT)

And we're back.

We're approaching the end of shutdown. The cyclotron is under vacuum, the main magnet is on, and both the RF and the inflector are at or near operating voltage. ISIS is running and the tuning effort is underway; the hope is to inject beam into the cyclotron within the next couple of days. Extraction down BL1A will follow, with extraction down BL2A planned for next week.

Regular beam delivery reports will commence next week. — Morton