62,63Mn/Fe run July 2009

Target issues
* Target number #406 UC2-C, RILIS
* Beam on target (no converter)
* Mass markers: Rb, Mn
* GPS separator
* Extraction electrode 55 mm
* Uht(GPS,CCV)=30.20 kV, Uht(GPS, HT_target)=30.1994 kV, Uht(trap)=30.00kV, Elec05=170 V

* No yield measurements were performed, but the yields were good reported by ISOLTRAP.

Experimental issues
* Beam to Miniball
* IS468

Tuning
* Normal (partly 62Mn/Fe and all 63Mn) and slow extraction (partly 62Mn/Fe) from EBIS
* REXTRAP synchronized with protons pulses for 62Mn/Fe; not for 63Mn

ISOLDE
87Rb: GPS.FC490 = 710pA RA0.FC90 = 610pA. Efficiency = 86%

Low energy
* Stable beam 87Rb
Icoll=139 mA, Tperiod to 50 ms, Tbeamgate=10 ms, Tbred=44 ms (optimised for 20+)

Trap inj plate 32.8 pA, BTS.FC20=17 pA => 52%
Trap inj plate=13 pA, RFQ.FC20(20+)=33 pA => 12.7% trap+EBIS efficiency

* Stable beam 55Mn
Icoll=179 mA, Tperiod=30 ms, Tbeamgate=10 ms, Tbreed=28.5 ms

Trap inj plate=12 pA, RFQ.FC20(background)=9.6 pA, RFQ.FC20(55Mn15+)=32 pA

=> trap+EBIS eff=12.4%

* Stable beam 55Mn
Icoll=189 mA, Tperiod=306 ms, Tbeamgate=10 ms, Tbreed=298 ms

Trap inj plate(no beam gate)=80 pA =>2.6 pA injected current
RFQ.FC20(55Mn21+)=4 epA =>7.3% trap+EBIS efficiency (Tbreed maybe not sufficient)

62Mn21+
Tperiod=300 ms, Tbreed=298 ms

Trap synchronised with proton impact

62Mn15+
Tperiod=300 ms, Tbreed=28.4 ms

Trap synchronised with proton impact

Linac transmission and energy: 
Accelerated radioactive beams: 62Mn15+(4.133), 62Mn/Fe21+(2.952), 63Mn17+(3.706)

Energy: 2.86MeV/u

Transmission: C4+ (A/q 3) RFQ.FC20 to XL65.FC50 85%, to Miniball 81%

87Rb21+ (A/q 4.14) RFQ.FC20 to XL65.FC50: 82%

Total transmission
GPS.FC490_to_trap x Trap_EBIS x Linac
0.86*0.10*0.81=7% (best case, otherwise around 5%)

Delivered beams
* 62Mn/Fe
12 out of 34 proton pulses, 3.1E13 ppp
At the REXTRAP injection plate 0.1 pA;

RFQ.FC20(62Mn15+)=0.15 epA, MB FC around 0.15 epA effective current

* 63Mn
14 out of 34 pulses, 3E13 ppp, 1.76 uA

No current measurement

Setting summary
For GPS we used:
* GPS_SEP_9-07-29_30.2kV.csv

* REX-GPS-2009-07-29.csv

REX low energy settings saved as:
REX-30kV-2009-07-29b_GPS_87Rb.xml

BTS-30kV-2009-07-29b_GPS_87Rb.xml

EBIS_2009-07-29b_GPS_87Rb.csv

EBIS_2009-07-27_GPS_62Mn15.csv

REX-30kV-2009-07-27_GPS+62Mn.xml

REX separator and linac base settings saved as:
09072_1153_SEP_Aq4.14_L65_82%_2.86MeVu_tunedMB.csv

09072_1153_Aq4.14_L65_82%_2.86MeVu_tunedMB.csv

090730_1155_SEP_22Ne6+_Aq3.666_2.85MeVu_85%_MB.csv

090730_1155_22Ne6+_Aq3.666_2.85MeVu_85%_MB.csv

Technical problems
* 7-gap3 filament supply broken + tube damaged (could not be repaired immediately, 2 shifts lost)
* DB4 collimator getting stuck

* X9GP.MQ10 locked in local mode after power glitch
* Several interruptions due to PSB problems

* Air conditioning to Linac stopped for 2 h

* The ISOLDE GPS separator was setup strangely as the voltages for GPS.BE560 and CA0.KI10 had to interchanged

* The HRS robot at ISOLDE got stuck at a target change -> 2-3 h beam time lost

* The EBIS booster turbo stopped working during the stable beam setup

Comments / Lessons learned
* Linac settings are now well reproducible. Need little time to tune the linac.

* Miniball FC very useful to optimize beamspot.

* When beam was delivered the yield of Mn and Fe at Miniball was very good

* The number of consecutive faults hampered the data-taking significantly

* The intrap decay studies could not be performed as all the faults limited the beam time