the hie-isolde faraday cup
DESCRIPTION
The HIE-ISOLDE Faraday Cup. BI Day December 6 , 2012 Alejandro Garcia Sosa W. Andreazza , E. Bravin , E. Daniel Cantero , M. Fraser, Y. Kadi , D. Lanaia , D. Voulot , F. Wenander. Contents. Introduction to HIE-ISOLDE The short diagnostic boxes Review of Faraday cups - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: The HIE-ISOLDE Faraday Cup](https://reader035.vdocuments.site/reader035/viewer/2022081512/56816737550346895ddbe861/html5/thumbnails/1.jpg)
The HIE-ISOLDE Faraday CupBI Day
December 6, 2012Alejandro Garcia Sosa
W. Andreazza, E. Bravin, E. Daniel Cantero, M. Fraser, Y. Kadi, D. Lanaia, D. Voulot, F. Wenander
![Page 2: The HIE-ISOLDE Faraday Cup](https://reader035.vdocuments.site/reader035/viewer/2022081512/56816737550346895ddbe861/html5/thumbnails/2.jpg)
2
Contents1. Introduction to HIE-ISOLDE2. The short diagnostic boxes3. Review of Faraday cups4. The HIE-ISOLDE Faraday cup5. Simulations6. Experimental Tests7. Conclusions
![Page 3: The HIE-ISOLDE Faraday Cup](https://reader035.vdocuments.site/reader035/viewer/2022081512/56816737550346895ddbe861/html5/thumbnails/3.jpg)
Energy upgrade10 MeV/uConstruction of SC LINAC+ service buildings
Intensity upgradeLINAC4+PSBDesign Study of target area, Class-A lab and beam lines
1. Introduction to HIE-ISOLDE
Beam quality upgradeRFQ cooler and buncherSolid state lasers for RILISHigher mass resolvingpower HRS
![Page 4: The HIE-ISOLDE Faraday Cup](https://reader035.vdocuments.site/reader035/viewer/2022081512/56816737550346895ddbe861/html5/thumbnails/4.jpg)
Energy upgrade10 MeV/uConstruction of SC LINAC+ service buildings
Intensity upgradeLINAC4+PSBDesign Study of target area, Class-A lab and beam lines
1. Introduction to HIE-ISOLDE
Beam quality upgradeRFQ cooler and buncherSolid state lasers for RILISHigher mass resolvingpower HRS
![Page 5: The HIE-ISOLDE Faraday Cup](https://reader035.vdocuments.site/reader035/viewer/2022081512/56816737550346895ddbe861/html5/thumbnails/5.jpg)
Energy upgrade10 MeV/uConstruction of SC LINAC+ service buildings
Intensity upgradeLINAC4+PSBDesign Study of target area, Class-A lab and beam lines
1. Introduction to HIE-ISOLDE
Beam quality upgradeRFQ cooler and buncherSolid state lasers for RILISHigher mass resolvingpower HRS
![Page 6: The HIE-ISOLDE Faraday Cup](https://reader035.vdocuments.site/reader035/viewer/2022081512/56816737550346895ddbe861/html5/thumbnails/6.jpg)
6
![Page 7: The HIE-ISOLDE Faraday Cup](https://reader035.vdocuments.site/reader035/viewer/2022081512/56816737550346895ddbe861/html5/thumbnails/7.jpg)
2. The short diagnostic boxes
![Page 8: The HIE-ISOLDE Faraday Cup](https://reader035.vdocuments.site/reader035/viewer/2022081512/56816737550346895ddbe861/html5/thumbnails/8.jpg)
Class 100ISO 5
Short diagnostic box
Vacuum valves
Steerer magnet
2. The short diagnostic boxes
![Page 9: The HIE-ISOLDE Faraday Cup](https://reader035.vdocuments.site/reader035/viewer/2022081512/56816737550346895ddbe861/html5/thumbnails/9.jpg)
9
Currently being developed by CERN and Added Value Solutions (AVS) with the support of the Spanish government (CDTI)
The device fits in the 90 mm long space available and contains◦A 45 degree scanning blade with 2 slits (H, V)◦HIE-ISOLDE Faraday cup◦Solid-state detector (Absolute energy, ToF)◦Collimators blade◦Attenuating and stripping foils
2. The short diagnostic boxes
![Page 10: The HIE-ISOLDE Faraday Cup](https://reader035.vdocuments.site/reader035/viewer/2022081512/56816737550346895ddbe861/html5/thumbnails/10.jpg)
10
Beam
![Page 11: The HIE-ISOLDE Faraday Cup](https://reader035.vdocuments.site/reader035/viewer/2022081512/56816737550346895ddbe861/html5/thumbnails/11.jpg)
11
![Page 12: The HIE-ISOLDE Faraday Cup](https://reader035.vdocuments.site/reader035/viewer/2022081512/56816737550346895ddbe861/html5/thumbnails/12.jpg)
12
![Page 13: The HIE-ISOLDE Faraday Cup](https://reader035.vdocuments.site/reader035/viewer/2022081512/56816737550346895ddbe861/html5/thumbnails/13.jpg)
13
![Page 14: The HIE-ISOLDE Faraday Cup](https://reader035.vdocuments.site/reader035/viewer/2022081512/56816737550346895ddbe861/html5/thumbnails/14.jpg)
REX vs HIE - DBs
14
REX - Faraday cup (length: 59 mm)
MCP (beam profile - image) or Si detector (energy and TOF)
Collimators wheel (attenuating and stripping foils as well)
• HIE - Faraday cup (14 mm)• Scanning slits (beam profile)• Collimators (optics)• Stripping foils in some cases• Solid-state detector in a few
boxes (absolute energy, TOF)
The most important device that needs to be tested is the FC
![Page 15: The HIE-ISOLDE Faraday Cup](https://reader035.vdocuments.site/reader035/viewer/2022081512/56816737550346895ddbe861/html5/thumbnails/15.jpg)
15
3. Review of Faraday cups
Destructive measurement Measures absolute beam
current The escape of electrons
increases the value readin the picoammeter.
Ion-induced electron emission:◦ Low energy electrons (Ee <
20 eV)◦ High energy electrons (Ee ~
keV for MeV/u ions)
![Page 16: The HIE-ISOLDE Faraday Cup](https://reader035.vdocuments.site/reader035/viewer/2022081512/56816737550346895ddbe861/html5/thumbnails/16.jpg)
4. The HIE-ISOLDE Faraday cup
16
30
14
26
59
(Distances in mm)
REX-ISOLDEHIE-ISOLDE ISAC 2
![Page 17: The HIE-ISOLDE Faraday Cup](https://reader035.vdocuments.site/reader035/viewer/2022081512/56816737550346895ddbe861/html5/thumbnails/17.jpg)
17
Electrons captured and retained Intensity:solid angle of the signal plate
In a simplified model:W2 retained electronsW1 lost electrons
Signal plate geometry
![Page 18: The HIE-ISOLDE Faraday Cup](https://reader035.vdocuments.site/reader035/viewer/2022081512/56816737550346895ddbe861/html5/thumbnails/18.jpg)
18
5. Simulations
REX-ISOLDE Faraday cup potential distribution -60 V
![Page 19: The HIE-ISOLDE Faraday Cup](https://reader035.vdocuments.site/reader035/viewer/2022081512/56816737550346895ddbe861/html5/thumbnails/19.jpg)
19
5. Simulations
REX-ISOLDE Faraday cup secondary e- tracking
![Page 20: The HIE-ISOLDE Faraday Cup](https://reader035.vdocuments.site/reader035/viewer/2022081512/56816737550346895ddbe861/html5/thumbnails/20.jpg)
20
5. SimulationsMore uniform potential distributionEnhanced effectiveness
HIE-ISOLDE Faraday cup: -500V +100V
![Page 21: The HIE-ISOLDE Faraday Cup](https://reader035.vdocuments.site/reader035/viewer/2022081512/56816737550346895ddbe861/html5/thumbnails/21.jpg)
21
5. Simulations
![Page 22: The HIE-ISOLDE Faraday Cup](https://reader035.vdocuments.site/reader035/viewer/2022081512/56816737550346895ddbe861/html5/thumbnails/22.jpg)
22
6. Experimental tests
![Page 23: The HIE-ISOLDE Faraday Cup](https://reader035.vdocuments.site/reader035/viewer/2022081512/56816737550346895ddbe861/html5/thumbnails/23.jpg)
23
stable beamA/Q =4Vsignal plate = 0 V
Vrepeller < 0 V (variable).
SignalPlate Repelle
r
Definition of I0
![Page 24: The HIE-ISOLDE Faraday Cup](https://reader035.vdocuments.site/reader035/viewer/2022081512/56816737550346895ddbe861/html5/thumbnails/24.jpg)
24
stable beamA/Q =4
Vsignal plate = 0 V
Vrepeller < 0 V (variable).
SignalPlate
Repeller ring
Ground ring
Biasing the repeller ring
The short cup does not measure the same current value and needs much higher repelling voltage.
![Page 25: The HIE-ISOLDE Faraday Cup](https://reader035.vdocuments.site/reader035/viewer/2022081512/56816737550346895ddbe861/html5/thumbnails/25.jpg)
25
stable beamA/Q =4
Vsignal plate > 0 V (variable).
Vrepeller = 0 V
SignalPlate
Repeller ring
Ground ring
Biasing the signal plate
• High leakage current• Beam current does not reach a
current plateau increasing the voltage
![Page 26: The HIE-ISOLDE Faraday Cup](https://reader035.vdocuments.site/reader035/viewer/2022081512/56816737550346895ddbe861/html5/thumbnails/26.jpg)
Biasing repeller ring & signal plate
26
Vsignal plate > 0 V (variable)
Vrepeller = -500 V
SignalPlate
Repeller ring
Ground ring
stable beam A/Q =4
![Page 27: The HIE-ISOLDE Faraday Cup](https://reader035.vdocuments.site/reader035/viewer/2022081512/56816737550346895ddbe861/html5/thumbnails/27.jpg)
27
7. ConclusionsCurrent measurements do not
agree with the nominal beam current using the present design
Further improvements in the design are in progress
Beam profile measurements are unaffected in principle by a change in the design.
![Page 28: The HIE-ISOLDE Faraday Cup](https://reader035.vdocuments.site/reader035/viewer/2022081512/56816737550346895ddbe861/html5/thumbnails/28.jpg)
28
AcknowledgementsThe ISOLDE CollaborationThe HIE-ISOLDE Project Team and groups
within CERN Accelerator and Technology Sector
The Swedish Knut and Alice Wallenberg Foundation (KAW 2005-0121)
The Belgian Big Science program of the FWO (Research Foundation Flanders) and the Research Council K.U. Leuven
The CATHI Marie Curie Initial Training Network: EU-FP7-PEOPLE-2010-ITN Project number 264330.
The Spanish Programme “Industry for Science” from CDTI
![Page 29: The HIE-ISOLDE Faraday Cup](https://reader035.vdocuments.site/reader035/viewer/2022081512/56816737550346895ddbe861/html5/thumbnails/29.jpg)
Thank you!
Work supported by the CATHI Marie Curie actions under contract GA-PITN-2010-264330.