Post- -accelerators accelerators for EURISOL for EURISOL Post - - PowerPoint PPT Presentation

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Post- -accelerators accelerators for EURISOL for EURISOL Post - - PowerPoint PPT Presentation

Aug 14, 2023 136 likes •301 views

Post- -accelerators accelerators for EURISOL for EURISOL Post Marie- -H H l l ne MOSCATELLO ne MOSCATELLO Marie On behalf On behalf of of the the Task Task 6 Group 6 Group M-H Moscatello EURISOL Town Meeting , CERN

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SLIDE 1

M-H Moscatello EURISOL Town Meeting , CERN 27-28/11/2006 1

Post Post-

  • accelerators

accelerators for EURISOL for EURISOL

Marie Marie-

  • H

Hé él lè ène MOSCATELLO ne MOSCATELLO

On On behalf behalf of

  • f the

the Task Task 6 Group 6 Group

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SLIDE 2

M-H Moscatello EURISOL Town Meeting , CERN 27-28/11/2006 2

Task Task 6 6 -

  • Summary

Summary

Introduction New design of the linac post-accelerator Superconducting Injector Normal conducting Injector High Frequency Chopper Next steps

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SLIDE 3

M-H Moscatello EURISOL Town Meeting , CERN 27-28/11/2006 3

Introduction Introduction

CNRS/IN2P3 (LPC Caen, IPNOrsay), GANIL, INFN/LNL, LMU (Frankfurt Univ.) to be implied: JYV, KVI 58 FTE persons.months from 01/02/06 to 31/10/06 User requirements -> New design of the superconducting linac Injectors: tests on prototypes or final equipments and studies are going on High frequency chopper: studies have really started (post-doc G.Le Dem) Diagnostics: problems of human resources Input for safety-radioprotection calculation given to Task 5 (beam energies, beam losses)

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SLIDE 4

M-H Moscatello EURISOL Town Meeting , CERN 27-28/11/2006 4

New design New design of

  • f the

the linac linac post post-

  • accelerator

accelerator

GANIL GANIL-

  • IPNO

IPNO

Poster P2: New Poster P2: New Preliminary Preliminary Design Design ofr

  • fr the

the EURISOL post EURISOL post-

  • accelerator

accelerator linacs linacs J J-

  • L

L Biarrotte Biarrotte

From: a/ “Experimental requirements”, N. Orr, April 2006 b/ Task 6,9,10 joint meeting May 2nd, 2006, Orsay

1. 3 separate post-accelerators: VLE (<1 MeV/u), LE (1-5 MeV/u), and HE (150 MeV/u) Task 6 studies concern only LE & HE accelerators. VLE post-accelerator will be taken into account by the Physics and Instrumentation Task. 2. Beta-beam injector will be a separate machine, studied outside Task 6 3. For normal use, the linac post-accelerators should NOT employ stripping foils because of safety, beam loss, and beam quality considerations. However, the provision of strippers as an option is desirable for physics applications requiring short-lived radionuclides or high energy high A beams 4. The most flexible scheme has to be found concerning beam sharing SPIRAL-2 philosophy : Smoothest beam dynamics (regular FDO lattice, low number of β-sections), Modular solution and simple cryostats, Separated vacuum (safety with FP), Warm focusing (easier for alignement), Possibility to insert diagnostics at each period, ease of tuning Main Hypothesis: Only 2-gap cavities (for high q/A acceptance), Max. accelerating fields 7.8 MV/m(120% Spiral2 operating point), Nominal operation for A/Q between 4 and 8 Input beam = RFQ + MEBT exit

  • > 585.4 keV/u for all ions @ 88.05 MHz (β = 0.035)
  • > Emittances (trans. & long.) = 0.1 pi.mm.mrad RMS NORM

New general specifications Design starting point

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SLIDE 5

M-H Moscatello EURISOL Town Meeting , CERN 27-28/11/2006 5

0.95 – 5.0 MeV/u 0.95 – 5.0 MeV/u

  • Output

energy range 23.8 m 12.6 m 11.2 m Length 23 cav 14 cav 9 cav # cavities

  • 2 QWR

1 QWR # cav./ cryo

  • 0.085

0.05 Cavity β

  • 88.05

MHz 88.05 MHz Cavity Freq. TOTAL Section 2 Section 1 A/Q=8

One short linac, with no intermediate-energy exit, optimized for A/Q = 8

0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 2 4 6 8 10 12 Mass over charge Final energy (MeV/u)

Max output energy = f (A/Q)

GenLinWin - CEA/DSM/DAPNIA/SACM β 0.1 0.09 0.08 0.07 0.06 0.05 0.04 EoT (MV/m) 8 7 6 5 4 3 2 1

Min output velocity: 0.045 Section 1 TTF Section 2 TTF

New design New design of

  • f the

the linac linac post post-

  • accelerator

accelerator 5 MeV/A linac design

132Sn25+

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SLIDE 6

M-H Moscatello EURISOL Town Meeting , CERN 27-28/11/2006 6

One linac, with 2 intermediate-energy exits:

  • TTF optimized for A/Q = 8
  • 150 MeV/A max. output energy tuned for 132 Sn 25+ (A/Q=5.28)

2.1 – 150.0 MeV/A 20.0 – 150.0 MeV/A 9.3 – 62.5 MeV/A 2.1 – 19.9 MeV/A

  • Ouput

energy range 206.8 m 103.8 m 59.0 m 26.1 m 17.9 m Length 276 cav 154 cav 80 cav 27 cav 15 cav # cavities

  • 14 SPOKE

8 HWR 3 QWR 1 QWR # cav./ cryo

  • 0.385

0.27 0.14 0.065 Cavity β

  • 264.15 MHz

176.1 MHz 88.05 MHz 88.05 MHz Cavity Freq. TOTAL Section 4 Section 3 Section 2 Section 1

132 Sn 25+

New design New design of

  • f the

the linac linac post post-

  • accelerator

accelerator 150 MeV/A linac design

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SLIDE 7

M-H Moscatello EURISOL Town Meeting , CERN 27-28/11/2006 7

132Sn 25+ beam envelopes

Exit n°1 Wmin = 2.1 MeV/A Wmax = 19.9 MeV/A (A/Q=5.28) Wmax = 13.1 MeV/A (A/Q=8) Bρmax = 5 T.m Exit n°2 Wmin = 9.3 MeV/A Wmax = 62.5 MeV/A (A/Q=5.28) Wmax = 40.5 MeV/A (A/Q=8) Bρmax = 8 T.m END Wmin = 20 MeV/A Wmax = 150 MeV/A (A/Q=5.28) Wmax = 100 MeV/A (A/Q=8) Bρmax = 13 T.m

  • 800 MV total voltage in the required A/Q range (100 MeV/A

for A/Q=8, 200 MeV/A for A/Q=4)

  • Large acceptance up to A/Q=11
  • Safe beam dynamics laws for every ion

0.0 50.0 100.0 150.0 200.0 250.0 300.0 350.0 400.0 450.0 2 4 6 8 10 Mass over charge

  • Max. final energy (MeV/u)

100 200 300 400 500 600 700 800 900 Total Voltage (MV)

New design New design of

  • f the

the linac linac post post-

  • accelerator

accelerator 3 energy exits

Linac performances Vs A/Q

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SLIDE 8

M-H Moscatello EURISOL Town Meeting , CERN 27-28/11/2006 8

(…) physics applications requiring shortlived radionuclides and high energy high A beams First try using 1 stripping station at exit n°1

  • 132Sn 25+ => Sn 47+ @ 20 MeV/A

=> Max. output energy becomes 254 MeV/A (instead of 150 MeV/A) => Transmisson is 30-35% (except if multi-charge acceleration is performed)

  • 210Fr 27+ => Fr 73+ (???) @ 13.5 MeV/A

=> Max. output energy becomes 229 MeV/A (instead of 103 MeV/A) Studies to be pursued

New design New design of

  • f the

the linac linac post post-

  • accelerator

accelerator

Time width ∆t = 25 ps (FWHM) Spec: < 100 – 500 ps => OK Energy spread ∆W/W = 0.5E-3 (FWHM) Spec for Energy Definition is < 1 E-3 => Energy compression system (chicane + RF cav) should be considered… ?

Stripping option Time & energy resolution

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SLIDE 9

M-H Moscatello EURISOL Town Meeting , CERN 27-28/11/2006 9

Superconducting Superconducting RFQ RFQ injector injector

LNL LNL

PIAVE Superconducting RFQ

Setting the relative phase

The superconducting RFQs in LNL are now in operation on the PIAVE injector Some beam parameter measurements have been performed

3.5 1.8 Stored energy (J) 24 24.1 Max surface Field (MV /m)

  • 12.0
  • 12.0
  • 18.0
  • 40.0

Phis (deg) 1.53 0.80 R0 (cm) 0.8 0.8 0.4 0.7 a (cm) 2.8 2.7 1.8 1.2 m 13 43 Ncell 74.4 138.9 Length (cm) 280 280 148 148 Voltage (kV) 585.4 351.3 351.3 37.1 Energy (keV / u)

  • ut

in

  • ut

in SRFQ 2 SRFQ 1 Transverse emittance measurement 0.125 0.200 1.2 MeV / u 0.103 0.100 0.58 MeV / u εnorm y RMS (mm.mrad) εnorm x RMS (mm.mrad) Energy at the end of PIAVE

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SLIDE 10

M-H Moscatello EURISOL Town Meeting , CERN 27-28/11/2006 10

Superconducting Superconducting RFQ RFQ injector injector

RMS 2.5 cm Shaper 67.4 cm Prebuncher 62.0 cm Booster 28.2 cm Adiabatic Buncher 19.7 cm Accelerator 17.9 cm

NC SC 350 → 20 kV Platform : a 3rd RFQ in front is needed

LNL

  • A. Bechtold

IAP Frankfurt

Envelopes of the new RFQ

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SLIDE 11

M-H Moscatello EURISOL Town Meeting , CERN 27-28/11/2006 11

Normal Normal conducting conducting RFQ RFQ injector injector

LMU LMU -

  • Frankfurt

Frankfurt Univ Univ. .

Poster P3: Poster P3: Proposal Proposal for a normal for a normal conducting conducting CW RFQ for CW RFQ for the the EURISOL post EURISOL post-

  • accelerator

accelerator A.Bechtold A.Bechtold

Status of the MAFF RFQ test stand

LEBT tank on its frame Quads

Uquad ≈ 3 kV

Steerer

RFQ

168 kΩ*m Shunt impedance 300 keV/u Wout 2.5 keV/u Win 5750 Q-value ≤ 60 kV (9.5 kV *m/q) Voltage ≤ 6.3 m/q 104 MHz frequency 3 m length

Vaccum tests of the RFQ have been performed: pIH = 3.6 10-7 mbar

Operation of the ion source

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SLIDE 12

M-H Moscatello EURISOL Town Meeting , CERN 27-28/11/2006 12

Normal Normal conducting conducting RFQ RFQ injector injector

A normal conducting RFQ tandem as injector into the SC linac

Vel,RFQ1 = 60 kV

  • Transm. = 100%

RF-power = 140 kW length = 4 m Vel,RFQ2 = 60 kV

  • Transm. = 100%

RF-power = 140 kW length = 4 m

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SLIDE 13

M-H Moscatello EURISOL Town Meeting , CERN 27-28/11/2006 13

High High frequency frequency chopper chopper

GANIL GANIL

Poster P6 Poster P6 Status Status of

  • f the

the EURISOL post EURISOL post-

  • accelerator

accelerator fast fast chopper chopper studies studies G.Le G.Le Dem M.Di Dem M.Di Giacomo Giacomo

y V/m

beam

V/m

SPL Type - Double meander line SNS Type - notched meander line

E-field section view on the beam path

+13 mm

  • 13 mm

A careful study of the current fast choppers (SNS-LANL, SPL-CERN, ESS-FETS-RAL) has been performed.

Fast chopper – β 0.04 adaptation Bunch frequency required by the users: from 8.8 kHz to 8.8 MHz (linac beam frequency = 88 MHz)

96 ns to 0.12 ms Chopping pulse duration < 5 ns Pulse rise/fall time 1:10 to 1:10000 Isolated bunch repetition rate 450 mm Deflecting length 26 mm Deflecting section aperture Required parameters Simulations Results 192 kV/m @ ± 2.5 kV Deflecting E-field @ DC Voltage 63.8 107 Width [mm] 170 150 Medium plane E [kV] on the beam path (@± 2.5 kV) 0.88 0.78 Coverage factor SPL SNS

Other solution: set of short capacitive electrodes

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SLIDE 14

M-H Moscatello EURISOL Town Meeting , CERN 27-28/11/2006 14

8.8 kHz 88 kHz 880 kHz 8.8 MHz Chopping pulse frequency Isolator Chopper 119.98 us / 99.9 % 11.98 us / 99.8 % 1.18 us / 98 % 96 ns / 80 % 1/1000 5 ns / (4.2 % - 0.42 % - 0.04% - 0.004 %) Chopping pulse duration (Td) / Duty cycle 1/10000 1/100 1/10 Isolated bunch repetition rate

"Bunch Isolator" :

+VDC HV- Pulse Beam velocity HV+ Pulse

  • VDC

12 ns Td

Chopper :

12 ns +VDC

HV- Pulse HV Pulse

Td HV+ Pulse HV- Pulse E-field Beam

⇒The major limit is the pulse generator. A compromise will have to be found

High High frequency frequency chopper chopper

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SLIDE 15

M-H Moscatello EURISOL Town Meeting , CERN 27-28/11/2006 15

Next Next Steps Steps

New linac design: beam dynamics to be performed into details (answer precisely to user requirements), cost study (safety constraints?) Beam characteristics to be confirmed by the beam preparation Task Detailed study of the strippers needed (technical, safety constraints) SC RFQ and NC RFQ: technical studies, cost comparison between both solutions High frequency chopper: Choose a solution type, prototyping of one of the electrodes set with the switches in the case of the capacitive electrodes, or the pulse generator in the case of the travelling wave structure. Diagnostics for RIB: to be started at the beginning of 2007 (problems with human resources)

Beam dynamics calculation at GANIL-Caen-France RIB diagnostics development at LPC Caen-FRANCE Post-doc position for