status of rex and commissioning with beam dr. jose alberto rodriguez, be-op-psb (167538)

Status of REXand

Commissioning with Beam

Dr. Jose Alberto Rodriguez, BE-OP-PSB (167538)

Content:

Status of REX• RF Systems

Commissioning with beam• Completed so far• Next steps

Summary

Jose Alberto Rodriguez, BE-OP-PSB (x167538)8th HIE-ISOLDE Physics Coordination Group Meeting - 2015/09/21

RF Systems:

Jose Alberto Rodriguez, BE-OP-PSB (x167538)

Beam from EBIS5 keV/u

Beam to HIE-ISOLDE2.85 MeV/u

Magnets:

Triplets 6

Doublets 1

Steerers 1H, 1V

Trip

let

IHS

RFQ

Bunc

her

7gap

1

7gap

2

7gap

3

9gap

Trip

let

Trip

let

Trip

let

Trip

let

Trip

let

Dou

blet

HV

Stee

rer

Power converters:

200 A, 50 V 20 (1 spare)

bipolar 3.5 A 2

Diagnostics:

REX HIE-ISOLDE

FCMCPCollimator aperturesBeam attenuators

FCSi detectorScanning SlitsCollimator apertures

Dia

gnos

tics

Dia

gnos

tics

Status of REX

Sectors 10

Turbopumps ~20

Cryopumps 3

Gauges ~25

Vacuum (incl. low energy):

8th HIE-ISOLDE Physics Coordination Group Meeting - 2015/09/21

RF Structure

Final Energy [MeV/u]

4-rod RFQ 0.3

Buncher 0.3

IHS 1.2

7gap 1 1.55

7gap 2 1.88

7gap 3 2.2

9gap 2.85

RF Systems:




Magnets:

Triplets 6

Doublets 1

Steerers 1H, 1V

Trip

let

IHS

RFQ

Bunc

her

7gap

1

7gap

2

7gap

3

9gap

Trip

let

Trip

let

Trip

let

Trip

let

Trip

let

Dou

blet

HV

Stee

rer

Power converters:

200 A, 50 V 20 (1 spare)

bipolar 3.5 A 2

Diagnostics:

REX HIE-ISOLDE

FCMCPCollimator aperturesBeam attenuators

FCSi detectorScanning SlitsCollimator apertures

Dia

gnos

tics

Dia

gnos

tics

Status of REX

Hardware refurbishment and commissioning for these systems completed and ready for beam commissioning since wk. 25 (HIE-ISOLDE diagnostics box since wk. 27).

Sectors 10

Turbopumps ~20

Cryopumps 3

Gauges ~25

Vacuum (incl. low energy):


RF Structure


4-rod RFQ 0.3

Buncher 0.3

IHS 1.2

7gap 1 1.55

7gap 2 1.88

7gap 3 2.2

9gap 2.85

RF Systems:



RF Structure


4-rod RFQ 0.3

Buncher 0.3

IHS 1.2

7gap 1 1.55

7gap 2 1.88

7gap 3 2.2

9gap 2.85


Trip

let

IHS

RFQ

Bunc

her

7gap

1

7gap

2

7gap

3

9gap

Trip

let

Trip

let

Trip

let

Trip

let

Trip

let

Dou

blet

HV

Stee

rer

Dia

gnos

tics

Dia

gnos

tics

Status of REX


4-rod RFQ: Functional since wk. 25 (10 Hz, 1ms, power levels up to A/Q = 4.0) Ready for commissioning with beam and physics program New steeper motor for one of the tuners will be installed this week Broken cooling fan will be repaired during the winter shutdown Duty cycle and peak power requirements will be significantly higher next

year (this applies to all the RF systems)

Buncher: Functional since wk. 25 Ready for commissioning with beam and physics program Phase shifter in the LLRF replaced on wk. 32

IHS structure: Powered on wk. 29, ramped up in wk. 30, functional since wk. 35 Ready for commissioning with beam and physics program Problem with LLRF’s control PLC solved on wk. 31 Amplifier disassembled, RF tube replaced on wk. 34

RF Systems:



RF Structure


4-rod RFQ 0.3

Buncher 0.3

IHS 1.2

7gap 1 1.55

7gap 2 1.88

7gap 3 2.2

9gap 2.85


Trip

let

IHS

RFQ

Bunc

her

7gap

1

7gap

2

7gap

3

9gap

Trip

let

Trip

let

Trip

let

Trip

let

Trip

let

Dou

blet

HV

Stee

rer

Dia

gnos

tics

Dia

gnos

tics

Status of REX


7 gap structures: Functional since wk. 32 Ready for commissioning with beam and physics program Problem with tuner of 7gap3 solved on wk. 32 Problem with reachable range of phases of 7gap1 solved on wk. 36 Possible problem stability of 7gap1 observed (gone, but may reappear)

9 gap structure: Temporary amplifier functional since wk. 25 Ready for commissioning with beam Final amplifier delayed. Will not available this year (implications in the

maximum A/Q (<3.6) and the time structure) Peak power and duty cycle increased on wk. 36 (52 kW, 0.2%: 10 Hz, 200 us) New RF line will be install on wk. 39 to minimize RF losses Problem with remote phase acquisition solved on wk. 36

Commissioning with beamStage 1: REX diagnostics box: Commissioning with beam started on wk. 25 (June 16th) Beam with an A/Q=4.0 was accelerated to 0.3 MeV/u (RFQ output energy) We reached the first diagnostic box and re-commissioned the FC, MCP and collimator wheel on wk. 25 Beam transmission through RFQ for different power levels on wk. 26

Beam in FC after RFQ for different collimator aperture sizes (15, 5, 3 and 1 mm)

MCP image of the beam after the RFQ

Diagnostic box: FC, MCP, Collimator Wheel, Beam attenuators


wk. 25 // 0.3 MeV/u

IHS

RFQ

Bunc

her

7gap

1

7gap

2

7gap

3

9gap

Dia

gnos

tics

Dia

gnos

tics

Beam transmission thru the RFQ vs RF power for A/Q=4.0


Already reported in previous meeting

Stage 2: First HIE-ISOLDE diagnostics box: First diagnostics box of HIE-ISOLDE installed at the end of wk. 27 First beam in FC and to the Si detector with 0.3 MeV/u energy on wk. 28 Systematic characterization by E. D. Cantero and S. Sadovich on wk. 33 and after More details in the next presentation by S. Sadovich

Commissioning with beam


wk. 28 // 0.3 MeV/u

IHS

RFQ

Bunc

her

7gap

1

7gap

2

7gap

3

9gap

Dia

gnos

tics

Dia

gnos

tics

Screen shot of BI expert applicationBeam in Faraday Cup


Beam signal in Si detector after pre-amplifier in “oscilloscope” mode

Diagnostic box: FC, Si detector, Scanning slit, Collimator slit

Quad scan using scanning slits (I = 15 pA)



IHS

RFQ

Bunc

her

7gap

1

7gap

2

7gap

3

9gap

Dia

gnos

tics

Dia

gnos

tics

Stage 3: Commissioning and phasing of RF Structures in REX: Cavities and their amplifiers were commissioned after they were turned on by the RF team Many of the problems listed in previous slides were discovered at this time Finally, operational settings (phases and amplitudes) for all RF cavities were determined


Energy spectrum around zero-crossing phase of the buncher

Phasing of the first 7gap structure

Energy of the beam for different phases and amplitudes out of the 9gap

wk. 28 - 36 @ 1.2 – 2.85 MeV/u


Jose Alberto Rodriguez, BE-OP-PSB (x167538)CM1

XLN

2.03

00

Stage 4: Commissioning the High Energy Beam Transfer (HEBT) line: First attempt to drift beam passed the cryomodule on wk. 33 Second attempt on wk. 38 (rupture disk incident and work related to the SRF tuners) Beam all the way to the last diagnostics box of XT01 at the end of wk. 38

8th HIE-ISOLDE Physics Coordination Group Meeting - 2015/09/21CM2 (2016) wk. 38 @ 2.85 MeV/u

XLN

3.03

00

XLN

4.03

00

XT00

.040

0

XT00

.070

0

XT00

.100

0

XT00

.130

0

XT01.0400

XT01.0900

FC name Measurement(1) BI expert app.

I [epA] (2) calibration for XT01.0900 Transmission

XRFQ.FC20 11.2 pA 10.6 pA (used external Keithley) 1.00

XIHS.FC10 9.3 pA Reading affected by buncher

XLN2.0300 0.47 (1) 9.3 pA (2) 0.88

XLN3.0300 1.09 (1) e - suppressor problem

XLN4.0300 0.48 (1) 9.5 pA (2) 0.90

XT00.0400 0.47 (1) 9.3 pA (2) 0.88

XT00.0700 0.45 (1) 8.9 pA (2) 0.84

XT00.1000 0.45 (1) 8.9 pA (2) 0.84

XT00.1300 0.79 (1) e - suppressor problem

XT01.0400 0.41 (1) 8.1 pA (2) 0.76XT01.0900 0.41 (1) 8.1 pA (used external Keithley) 0.76

End

Tunn

el

SC S

olen

oid

Qua

d

H/V

Ste

erer

s

Overall transmission ~75% Transmission through REX ~88% No mayor problems found (two

electron suppressors don’t work) Optics model seem to work pretty

well, but systematic measurements of beam properties still need to be done


Jose Alberto Rodriguez, BE-OP-PSB (x167538)CM1

Next steps (high priority): Deliver beam from the pilot source before the trap to the end of XT01 Finalize the commissioning of the new TRAP/EBIS/RF timing system and the high level control application Phase SC cavities and measure the energy gain of the beam (benchmark their performance) Test machine scalability in A/Q and in energy

8th HIE-ISOLDE Physics Coordination Group Meeting - 2015/09/21CM2 (2016) wk. 38 @ 2.85 MeV/u

Next steps (lower priority): Systematic measurements of beam properties (e.g. emittance, Courant-Snyder parameters…) Benchmarking optics model and implement modifications if necessary Finalize and commission the field regulation of the power converters for the dipole magnets

Next steps (medium priority): Improve beam transmission Individual calibration of each Faraday cup Cross calibration of the two Si detectors and the dipole magnets and determine error bars in beam

energy measurements Check calibrations / phases after installation of new RF line for 9gap and steeper motor for tuner of RFQ Systematic commissioning of all the devices in the beam diagnostics boxes Systematic checks with beam of polarities of all optics magnetic elements Finalize and commission the beam diagnostics high level control application

Summary


Status of REX: Hardware refurbishment and commissioning of power converters, magnets, diagnostics

and vacuum systems completed before wk. 25 All RF systems operational at the same time since wk. 35 (some of them since wk. 25) Due to delay in delivery of the final 9gap amplifier, we will need to use the temporary

amplifier (constrains in maximum A/Q and time structure deliver to users)

Commissioning with Beam: Commissioning started in wk. 25 and progressed as hardware was ready 12C4+ beam produced in the charge breeder has been accelerated to 2.85 MeV/u (REX

nominal final energy) and transported to the end of the XT01 experimental line A lot of work still needs to be completed before the start of the physics program


Additional Slides

Jose Alberto Rodriguez, BE-OP-PSB (x167538)8th HIE-ISOLDE Physics Coordination Group Meeting - 2015/09/21

Constrains imposed by the temporary amplifier


Limits on peak power

translate into

Limits on the repetition rate translate into

Limits on the maximum A/Q

of the beam

Possible beam contamination

Limits on the maximum A of the beam

Stripper foils for light ions

Longer breeding time

Lower breeding efficiency

Lower beam current

Non-usable or lower quality experimental data for heavy ions

Force to operate in non-optimal of the CSD

Constrains on the time structure

delivered to users

Limits on duty cycle

translate into

Unable to stretch

beam pulse

Lower beam current

Increase operational complexity (set-up time, risk,

reduces beam quality…)

Limits on half-life of the beam

Fortunately, only a few of these affect the experiments planned for 2015 Having the amplifier for the 2016 experimental campaign is an absolute must!

Increased pile-up

Lower effective beam current

Fewer and longer experiments (ie.

reduced physics output)


status of rex and commissioning with beam dr. jose alberto rodriguez, be-op-psb (167538)

Documents

beam commissioning

oppsb x167538beam

hieisolde diagnostics

rf systems buncher

physics programproblem

rf tube

low energy

physics programphase