Status of the ion traps at ATLAS Jason

Status of the ion traps at ATLAS Jason Clark ATLAS users workshop August 8, 2009

Ion traps at ATLAS

Overview of the apparatus

The BPT (Beta-decay Paul Trap) RFQ electrodes End view: DSSD Plastic scintillator trapped ions Plastic scintillator Side view: electrodes Si telescope shielding Plastic scintillator trapped ions Plastic scintillator inject ions

The BPT (Beta-decay Paul Trap) SIDE VIEW: END VIEW:

First results and plans Alpha-alpha coincidences (8 Li) First tests: • tested trap with 252 Cf fission fragments offline First experiments: • 14 O • 8 Li Plans: • decrease RF noise on electrodes • optimize transfer of light ions • higher resolution DSSDs

Measurements made with the CPT -decay Astrophysics (novae, x-ray bursts, rp process) 0+ 0+ -decay Nuclear structure, regions of deformation Astrophysical r process

Measurements with the CPT Very successful mass measurement program to date (over 150 nuclides measured)

Improvements over the years • Stronger source (from 1 μCi to 100 μCi) • Automation of system • automated filling of cold traps with liquid nitrogen (He purification system) • installed mass flow controller to regulate He pressure in gas catcher • improved acquisition program (much easier to switch between masses) • Replaced isobar separator magnet (improvement? ) • Beam router made more stable • Added ability to destroy molecules in isobar separator • Now able to chill gas catcher & isobar separator (reduce contaminants) • Replaced MCP with channeltron

Moving the CPT to CARIBU

The CPT at CARIBU Experimental area Stable ion source Buncher

Moving the CPT to CARIBU And finally in position: Into CARIBU:

Moving the CPT to CARIBU Getting ready to remove the superconducting magnet from its original location: Looking worried …

What will be new to the CPT at CARIBU • New cryogenic linear trap • more efficient capture in Penning trap • less energy spread of ion bunch • New computer system • still need computer to run experiments with BPT! • Coupled to a new injection system Linear ion trap

Updated facility diagram CARIBU Canadian Penning Trap Beta-decay Paul Trap