Minutes
from REX integration meeting
Present: Mats Lindroos (chair), Luis Fraile,
Pierre Delahaye, Fredrik Wenander,
Thomas Sieber, Ivan Podadera
1. Planning
* Two blocks of REX
runs are scheduled, 23/5 ->, and 11/7 ->
* An off-line Li test
should be carried out before the IS399 experiment to test Ar
cooling in the trap, beam transport between trap and EBIS.
2. Control system
* Ivan Deloose estimates 3 man-weeks to upgrade the control system
to XP. The migration should be ready by end of June.
* Three other tasks
have been asked for after June
slow extraction
from the EBIS
implementation of
the 200 MHz amplifier
implementation of
the magnet triplet
Thomas will ask if it
is possible to start on the two latter projects already now. For the slow
extraction Nicolas de Metz-Noblat or
???? should be
contacted.
* The two
* The price for two framegrabbers and an optical card for the Hall probe is
~3500 euro. Purchased by Thomas.
3. REXTRAP
* The molecule tests
gave the following efficiencies inside the trap:
Se+ 8%
SeCO+ 60%
AlF+ 6% (possibly a factor two larger)
F+ 0%
* During the test we
had problems with the tuning of the beam transport from the HRS to the REXTRAP.
* The PROFIBUS
stopped and could not easily be restarted, neither with a reboot of the VME,
nor by switching it on and off. In case of PLC/PROFIBUS problems Marc Delrieux or Ismael Vadillo can be contacted.
* A request for
assistance with the beam transport from the GPS and HRS to REXTRAP was put
forward.
4. REXEBIS
* The vacuum in the
EBIS is improving, but still worse than last year. This could be explained by less
performing pump on the gun side and lower bake-out temperature with the new
baking system. The baking system also had a few interruptions due to ground
faults, something that should be avoided as unnecessary stress is introduced in
the system.
* The LqHe consumption of the EBIS is doubled. The explanation
for this is not clear, as all precautions have been
taken during the cooling down to reduce the boil-off.
* Three channels (out
of 8) in the two TREK supplies for the inner and outer steerers
are broken. Two could not easily be repaired. Since the supplies were repaired
last time this shutdown, replacement supplies should be purchased.
* The mass separator
is operational, but the vacuum is poor and the two MCPs
are not working.
5. Linac
*
The amplifier for the second 7-gap resonator is tested with a dummy load.
*
The conditioning of the 200 MHz resonator has started; behaves well.
*
Jose Marques is working together with Ivan Deloose
with the remote control for the 200 MHz amplifier.
*
The RF workshop takes care of the lead shielding that is falling down from the
7-gap resonators.
*
The triplet behind the 9-gap resonator has no remote control.
*
Thomas is satisfied with the work of Nicolas David for the power supplies.
Fredrik agrees.
*
The Danfysik power supplies should be replaced by
*
The Coulotron beam view system is re-installed after
repair. A spare one is ordered.
* A
valve has been installed at the 3rd straight beam line.
*
The amplifier room will be locked in the future. The key is found in the key
box in the ISOLDE control room.
6. Misc
* B. Hadorn in the ABP-HSL section has started the
categorization of some REX drawings.
* An old telescope is still requested from the
alignment group.
* The low energy and control part of the Yellow report
is nearly finished.
* Thomas has written a document with REX operation
guidelines to be distributed to the users. Input from the REX responsible is
requested.
* The question how to operate REX during beam time
with the limited manpower was raised.
Notes by Fredrik Wenander