Minutes from REX meeting 2004-09-29

Present: Pierre Delahaye, Mats Lindroos (chair), Georgi Georgiev, Richard Scrivens, Thomas Sieber, Luis Fraile, Peter Butler, Ivan Poddera, Fredrik Wenander

General issues

* A draft of the minutes should be sent to the closest REX group, to be approved by it, before they are published for the general public.

* The 27^th of Oct there will be a ‘Meeting on REX-ISOLDE low-energy stage operation’ with the people involved.

* An invitation to ‘ECR Charge breeding Workshop Nov 8-9 2004’ has gone out (see below).

* The newly employed control engineer will after the introduction be asked if he can modify the EBIS control system for slow extraction. In case assistance is needed, Joakim Cederkall has agreed on spending two weeks on the problem in the beginning of next year.

* Ivan Podadera requested to borrow the Munich slit-grid emittance meter for measurements on his ion source to be used to test the ISOLDE RFQ cooler. Presently it is installed after the REX Linac. Thomas and Ivan should agree on a suitable time.

* Due to the problematic start the Mg run has been prolonged until 16:00, Sat 9^th.

* A checkup of this year’s expenses should be done within the next weeks to optimize the spending.

* A draft for the budget 2005 has been compiled by Thomas and is attached as a separate document to these minutes. Input from the REX low energy part is still missing, as well as from the control group. The budget is to be discussed at the REX meeting the 13^th Oct.

* The 9,11Li Run was discussed briefly. Advantages and drawback of different trap buffer gases as Ne and Ar were discussed in addition to the option of using a stripper foil in the end of the Linac to reduce the residual gas contamination.

REXTRAP

* On Monday evening 27^th Oct REX was given the beam for the Mg run from GPS. The low energy part was setup successfully. Transmission GPS to REXTRAP close to 100%; the trap was setup with 45-50% efficiency; a record efficiency of 18% of K+ to K18+ for the EBIS was obtained.

* The water leak in the EBIS (see below) resulted in 100-200 l water on the roof of the trap cage. The blue tarpaulin saved the trap (this time also), even if some of the water penetrated the protection. The trap has been tested with HT after the drying up.

* The release valve for the REXTRAP LN2 dewar should be checked by TIS as it doesn’t seem to release at 4 bar as specified.

REXEBIS

* A water leak appeared on the Tuesday morning from on of the collector cooling tubes. The tubes are brittle due to aging and a different type should be installed during next shutdown. Possible a protection plate should also be installed, preventing the electronics from being water sprayed. All old water tubes were exchanged after this week’s water leakage.

* The water leak was extremely unfortunate as it sprayed the top of the electronics rack and the electronics (vacuum controllers and gauges, power supplies, control electronics) and HV cables in two of the racks were water damaged. The electronics had to be taken out, dried and some of it had to be repaired or exchanged.

* The EBIS is now operational again. A voltage sampling box and a Penning gauge remain to be repaired.

LINAC

* Han Broere has visited the Dressler. They are in time with the 200 MHz preamplifier. There are still problems, however, with the spare-amplifier for the buncher. The buncher amplifier has to be removed from the REX setup after the running period for test measurements.

* Oliver Kester is now proof-reading the Linac section for the Yellow report. He will add some of his calculations for the beam transport.

* An A/q of 4.2857 is foreseen for the 30Mg run, with a final energy of 2.8 MeV/u.

Minutes taken by Fredrik Wenander

==================================

ECR Charge Breeding Workshop

and

Open Collaboration Meeting

8-9th of November 2004

at CERN

==================================

Dear Colleagues,

We are organizing an ECR Charge Breeding Workshop and open collaboration meeting at CERN on the 8-9th of November, 2004.

In the open IS397 collaboration meeting we would like to discuss the outcome the ECR charge breeding technology for radioactive ions in general, this year's result at CERN and elsewhere, and a possible future program for charge breeding of radioactive ions at ISOLDE.

We would very much like to ask for further oral contributions to this workshop. Please contact us with a title and abstract if you are interested in participating.

A preliminary program follows:

==================================

The workshop will begin at 11 am on Monday and end mid-afternoon on Tuesday

The general framework and outline of each day is below:

Monday, 8 November

Current Status of ECRIS Charge Breeding

1 Overview Charge Breeding

ECRIS, EBIS, and other methods

2 Current ECRIS Charge Breeding

ISOLDE, TRIUMF, SPIRAL

Tuesday, 9 November

Future Prospect with ECRIS Charge Breeding

1 EURONS Framework 6

2 ECRIS Charge Breeding - New Projects

UHV ECRIS, 28-60GHz ECRIS

==================================

Speakers and call for abstracts

Speakers will include (updates of the program on the web):

Prof. Richard Geller (LPSC)

Dr. Friedhelm Ames (TRIUMF)

Dr. Tomas Fritioff (ISOLDE)

Dr Fredrik Wenander (REX-ISOLDE)

Prof. Oliver Kester (LMU)

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Monday Evening Meal

There will be the opportunity to meet for dinner on Monday evening at a local restaurant. If you are interested in joining us, please indicate how many people you would like to bring with you and we will make the reservation at a local restaurant. ==================================

Registration and workshop information

Electronic registration forms for this workshop, information on how to book accommodations, the workshop program, and other information can be found on the workshop website at

on http://cern.ch/ECR-Workshop

==================================

We hope to see you in November.

Charles Barton, cjb18@npg.york.ac.uk

Tomas Fritioff, Tomas.fritioff@cern.ch

Mats Lindroos, mats.lindroos@cern.ch