REXTRAP plans for 2005 And future developments Pierre for the REX TEAM, REX’s day, 11/03/2005

Current status The trap is currently operational. -The cage has been cleaned by Ivan and Romain -the turbo pumps have been greased by Sophie - the power supplies resources are going to be well under control (see talk of Nicolas) - A shortcut of a trap electrode had to be fixed in the cross piece in front of the magnet -efficiencies of 30-40% have been obtained with the new CS. We should reach soon 50% - the power regulation from Mike behaves the right way. Some more tests needed But: -The DDS module has one channel which is broken. This quite fragile module gives the voltages of the cooling excitation. Some redesign? - The control system is in its commissioning stage (cf Romain’s presentation). Some improvements to foresee? - The long standing sparking problem has to be definitely fixed - the vacuum automat still doesn’t work fully properly - the balloon won’t be connected this year - the tests for the beam preparation of this year’s beamtime have to be started

Tentative schedule 1) Labview CS commissioning. February-March-April. Not 100% time consuming 2) Rotating wall cooling tests: emittance measurement. Possibly end of March / beginning of April - 1 week 3) Change of buffer gas: Ar cooling. 2 days mid April 4) Change of buffer gas: tests with He. 3 days mid April 5) Tests with Li from REXTRAP ion source, light ions cooling. One week in May 6) May  October: REX operation according to the ISOLDE schedule 7) Mass resolving power tests: some tests between July – August (summer student time) Some preliminary tests in May could be foreseen. And the WITCH tests that could be done in autonomy

Future developments - Mass resolving power of the trap Tests needed. Implementation of a new excitation scheme – 6/9 months of a PhD -Conclusions on the rotating wall cooling tests. Still some emittances to be measured 1 month of a PhD – article? -Development of the molecular beam breakup techniques – 2/4 months. A collaboration with theoreticians could be helpful - Improving the typical efficiency of the trap. Quite careful studies (5-10 months) by simulation and tests for -lowering the magnetic mirror effects -Implementing a more efficient cooling excitation - New differential pumping scheme at the trap. 1/3 months. More efficient trapping scheme. Use of He as a buffer gas. - Beam diagnostics improvements. Beam identification after the trap - 3 months.

REXTRAP R&D: The manpower issue Several tracks are pursued -Modification of the current position of Romain  PhD? Doctorate students program at CERN/ Marie Curie applications -One application to the Austrian program