KEK Participation in the LHC Injector Upgrades C. Ohmori, KEK/J-PARC M. Paoluzzi, CERN 10 PSB...

KEK Participation in the LHC Injector Upgrades

C. Ohmori, KEK/J-PARCM. Paoluzzi, CERN

10 PSB cavities PS Damper cavities

Magnetic Alloy-FINEMET® loaded wideband cavities for CERN PSB and PS in the frame of the LHC Injector UpgradeCollaborative Work ICA/JP/0103

RF Collaboration for LHC Injector Upgrade Objectives

• Consolidation/upgrade of the PSB RF systems possibly using wideband, multi-harmonic, solid-state driven Magnetic Ally loaded cavities

• Development and installation of a longitudinal damper in the PS

Core Technology :

• Wideband Cavity using Magnetic Alloy,Finemet-FT3L• Use of Solid State AmplifiersCollaboration activities• Studies on the PSB multi-gap wideband cavity-beam interactions

– Beam Studies at J-PARC MR during LS1 & PSB

• Study radiation damage on solid-state RF amplifier– Radiation damage test at J-PARC MR

• Study, design and prototype a longitudinal damper for the CERN PS– Wideband cavity system to damp the longitudinal coupled bunch instability

• Collaboration on the conceptual design of feed-forward beam compensation schemes for FINEMET® cavities– J-PARC wideband cavities handles 1E14 ppp in MR with Feed Forward compensation in LS1

2015/7/30 C.Ohmori@CERN-KEK Committee 2

Advantages of Magnetic Alloy (Finemet®) Cavity for J-PARC Case

RF cavity loaded with magnetic alloy cores• High field gradient ->

Compact accelerator for 3 GeV RCSNew Cavity for High Rep. Rate of MR (2.48 sec-> faster than 1.3sec cycle !)

• Wideband system -> dual harmonic acceleration for J-PARC RCSStable operation of high intensity beams

cavities of proton ringsNew FT3L cavityIn J-PARC MR 　（ installed in 2014 ）

32 kV/m at test bench

（ New Record! ）4 more cavitiesInstalls in summer



Status of J-PARC accelerator

530 kW eq. /4 pulses> 1 MW @ 1.3 sec rep.Linac delivers 50 mA ! RCS accelerates 1 MW eq.

Max beam current/power from latest beam test

Linac beam current

Harada @ J-PARC center meeting 2015/7/

400 MeV Linac 3 GeV RCS 30 GeV MR

No.

of p

roto

n pe

r pul

se1 pulse injection (4 is normal)

132 kW by 1 batch If 4 batch, 530 kW

Advantages of Magnetic Alloy (Finemet®) Cavity for PSB/PS Case


RF cavity loaded with magnetic alloy cores• High field gradient ->

Replacement of PSB cavitiesEnough voltage to damp coupled bunch instability at PS

• Wideband system ->dual harmonic acceleration for PSB compensation of multi-harmonics for PS

• Stable/medium impedance

Compact RF system driven by solid state amplifiers• Multi-cell structure (24-36 cell / PSB ring, 24 is enough)

Reduction of down time• Cost reduction: no bias PS, no tube, no anode PS

Objectives

• Consolidation/upgrade of the PSB RF systems possibly using wideband, multi-harmonic, solid-state driven RF cavities


Core Technology :



• Study radiation damage on solid-state RF amplifier– Radiation damage test at J-PARC MR




FINEMET® loaded wideband cavities for CERN PSB and PS in the frame of the LHC Injector UpgradeCollaborative Work ICA/JP/0103

RF Collaboration for LHC Injector Upgrade

Magnetic Alloy- Finemet®


MA Cavity: V=Z(f) x IRF

Ferrite cavity: V=Z(f, ferrite bias, temperature, BRF,) x IRF

Characteristics Cavity Impedance

Shun

t im

peda

nce

RF voltage


Finemet cavities may (will) work as C02 & C04 systems

M. Poluzzi @ Finemet review

Mass Production of Magnetic Alloy- Finemet®


KEK-system

Company

KEK-made cores will reduce temperature of cavity core.

• KEK-made Magnetic annealing oven for Mass Production worked very well. 280 large cores were produced in 1.5 yr.

• Mass production for J-PARC MR is over.

• Overhaul of oven is also finished in March.

• Availability and reliability of cores look OK.

Improvement of Finemet® Core will be a important contribution from Japan.

Magnetic annealing oven for nano-crystallization

http://www.google.co.jp/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0CAcQjRxqFQoTCO_kgPqt5MYCFcQTlAodk8IKQA&url=http://akibamap.info/archives/50891706.html&ei=TxuqVa-BOMSn0ASThauABA&bvm=bv.98197061,d.dGo&psig=AFQjCNESRorGetIcsnpBBVbFjp1zFU2RSg&ust=1437297845321861

http://www.google.co.jp/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0CAcQjRxqFQoTCK_HuKyu5MYCFQsmlAod2UkFuQ&url=http://ameblo.jp/macaroni-market/entry-11532212240.html&ei=uRuqVe-GKovM0ATZk5XICw&bvm=bv.98197061,d.dGo&psig=AFQjCNEBUcb5sOu1gasc9P78Nz6XHZRj5g&ust=1437297944013859

Solid State Amplifiers• Radiation Damage

– Tests at J-PARC & Fraunhofer

– Choice of FET– Compensation of radiation

• Reliability– Many minor modifications

(cooling units, connectors,,)– Documentations for PS/PSB

• Availability– Production in Europe/Japan


J-PAC tunnel: charged particles, n, ,g similar to PSB/PS

FY15, KEK will make 2 units for PS Damper based on CERN-documents.

J-PARC

Compensation of radiation effect @Fraunhofer

PSB RF section: 1- 40 Gy/yr

Japanese contributions (Solid State AMP)• Supply of Solid State Amplifiers

for PSB two rings is included in ATLAS-Japan proposal for LHC/ATLAS upgrade.– KEK-CERN has an experience of

collaboration on solid state amplifier for J-PARC in 2002-2006.

• Production Plan

The schedule fits the request for LIU.Precise cost estimation is under taking.

44 sets of solid state amplifiers for two PSB rings will be covered by this proposal.


2014 2015 2016 2017 2018

# amp 2 2 16 16 8

Cost 6M JPY

6M JPY

48M JPY

48M JPY

24M JPY

150 AMPs for J-PARC w/o problem

(PS)(R&D)

Quantity can be delayed

8 16 16

SSA for PSB

Objectives

• Consolidation/upgrade of the PSB RF systems possibly using wideband, multi-harmonic, solid-state driven RF cavities


Core Technology :



• Study radiation damage on solid-state RF amplifier– Radiation damage test at J-PARC MR & detail design on cooling




FINEMET® loaded wideband cavities for CERN PSB and PS in the frame of the LHC Injector UpgradeCollaborative Work ICA/JP/0103

RF Collaboration for LHC Injector Upgrade

feedback

Beam Test at J-PARC MR during LS1


1.4x1013 protons were handled by a single AMP system !

SSA technology & damper cavity are useful for other rings: J-PARC, RHIC

Recent Beam Acceleration at PSB

• Beam test up to 1013 ppp• Using for CERN (~86%) user

operation as H=2 cavity • Promising results for high

intensity operation.



L. Ventura, Finemet Review 2014

Study, design and prototype a longitudinal damper for the CERN PS

Instability is excited after passing γT and after bunch splitting at flat top.Combination of wideband cavity & solid state amplifier is installed. Technology developed for PSB is applicable for this purpose.

• Emittance growth by Longitudinal Coupled Bunch Instability.

• Frequencies to be damped: many harmonics of revolution frequency, not only RF frequency => Wideband damper !

Beam test using ferrite cavity (narrow band)2015/7/30 C.Ohmori@CERN-KEK Committee 16

H. Damerau


First Finemet Review: Sep. 20142nd Review: Sep. 2015 to advise

-> Next year


2020

2019

2017-2018

2016-2017

Other topics

• Other applications at CERN– ELENA anti-proton deceleration cavity– Replacement of AD CO2 RF System – Inductive adder with Finemet® Technology

• Future application for J-PARC– Feedback SSA for MW beam

• Technology transfer for Medical accelerators– MedAustron, KHIMA in Korea

Universal cavity system ! 2015/7/30 C.Ohmori@CERN-KEK Committee 19

Summary• CERN-KEK Synergy for low frequency RF technology has been

continued for over 10yr.– This technology will be used for other machines; ELENA, AD, J-PARC,

RHIC, medical machine,,,• Participation for LIU was successful.

– Upgrade of PSB RF system – PS damper system

• KEK will support the mass production of FT3L Finemet® cores.• Contribution for PSB SSA production is under consideration.

– In FY15, Production of 2 SSA for PS Damper.• SSA technology might be employed J-PARC MR feedback AMP for

MW beam.


In this collaboration, experiences are circulating!

2015/7/30 C.Ohmori@CERN-KEK Committee 21Thank you!

First Magnetic Alloy Cavities @CERN from 2005

Nice View in Bldg.150

Back up slides


PS Longitudinal Damper

Frequency : 0.5-5.5 MHz. Peak voltage : up to 5 kV.

6-cells cavities.Each cell with one gap and 2

Finemet® cores.Each cell driven by two 2.5 kW

solid-state amplifier.Water cooled cavities and

amplifiers.

During 2012, with CNGS high intensity operation, the dose measured was ~1.6 kGy.

=>

AMP Needs more protections

Other contributions (better FT3L cores)• Pop FT3L production test by KEK

– KEK system has better performance

• Production of FT3L cores using KEK-made mass production system may help to improve the PSB cavity performance.

KEK system was shipped to company


300 ton rental magnet

Shun

t im

peda

nce

(W)

J-PARC-system

Company

Will reduce temperature of cavity core.

25

H. Damerau, Chamonix 2012, 09/02/2012

Timeline (present baseline)

2012

2014

2015

2016

2017

New

cou

pled

-

bunc

h fe

edba

ck

PS

PSB-P

S

tran

sfer

1.4

GeV

2

GeV

PSB H

- inje

ctio

n

read

y fo

r

inst

alla

tion

2013

2018

Cham

onix

2012

Lina

c4 d

eliver

-

in

g H

- into

PSB if

conn

ecte

d in

LS2

LS1 for injectors

LS2 for injectors

1.4 GeV 2GeV

• 2 GeV upgrade of PSB + increase of PS injection energy excluded for LS1

LS1.5?

Lina

c4 rea

dy,

p+ fr

om

Lina

c4

2019

PSB RF s

ystem

Damper syst

em

Studies on the PSB wideband cavity-beam interactionsReducing ferrite cavity voltage, tried to accelerate 4.6E12 PPP using 5-gap FT3L cavity, as # of FT3L cavity is not enough. • Achieved ~ 60% of typical maximum • LHC: few 1E12 ppb, 130 ns• High Intensity Goal : 1.4E13 ppb, 200 ns• full use of the Linac4: 2.5E13 ppb

Mauro Paoluzzi

Ferrite cavityvoltageFT3L cavity voltage

Beam current

Beam Phase

↑Injection

↑Extraction

Beam acceleration test at PSB 　

Beam Test at J-PARC MRCollaboration on the conceptual design of feed-forward beam compensation schemes for FINEMET® cavities

　A single gap cavity was shipped from CERN and installed. The test will be done next March.

Test


After LS1, number of FT3L cavity is increased and acceleration only using FT3L cavity will be tried.

Ferrite and FT3L cavities

Ferrite FT3L

Material Ferrite Magnetic alloy-ribbon

Typical Q-value ~100 ~1

Bandwidth Narrow Wide

Cavity tuning @ acceleration

Necessary Not necessary

mQf Stability No Yes

Field gradient @ few MHz

<15 kV/m ~30 kV/m for J-PARC upgrade

Dual Harmonic No (need another cav.)

Yes

FT3L is two times higher than FT3M

FT3L

Flux density in material V∝

Prod

uct o

f

mQ

f ∝

-1 Lo

ss

FT3M

FT3M cavities in Low Energy Ion Ring by CERN-KEK collaboration(~’05)


In PSB and PS, b is not about 1. The accelerating frequency has to be changed according to energy. Traditionally, ferrite-loaded cavity was used to change it. ferrites

Ferrite-loaded cavities & vacuum tube amplifiers

Present PSB RF systemC02 : freq= 0.6-1.8 MHzC04 : freq 1.2 3.6 MHz

FT3L cavities & solid state amplifiersWideband systems


Many RF stations => Failure of one (a few) RF systems does not affect the operation.

Consolidation/upgrade of the PSB RF systems

Advantages: high voltage, modular system, spare system, more spaces, simpleRisk: New technology and configuration. => need study before replacements

PIN Diodeneutron

FET low-sens.dose

RadMonSingle Ev.

FET high-sens.dose

FETs to be tested

RadMon

RadMon Moj.

FET to test

Study of radiation damage on solid-state RF amplifier• High Power FETs from different suppliers were tested

using a collimator section of J-PARC MR. The dose was monitored by CERN-made “RadMon” system.

• Two FETs （ MRFE6 、 SD2942) look possible to use. They are stronger than FET (MRF151G) currently used in PSB tube amp.

According to dose,

characteristics changes !

RadMon Collimator Section

Collimator Section

The results are consistent with the experience that MRF151G survives in PSB ( RF sections: 14 , 30 ,1 Gy )


Core technology

補償あり補償なし

Beam Signal

Wake Voltage


きれいに消えた

実際にはセルンの特異なフィードバックでの補償を予定

KEK Participation in the LHC Injector Upgrades C. Ohmori, KEK/J-PARC M. Paoluzzi, CERN 10 PSB...

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