OPMEN T OF ST R IPPER O PTIONS F OR FRI B · nergy of app r he uranium b e f the linac ifferent...
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A T B h a M g t f e t o d d b p p f d F i b F a g m Abstract The US Depar Beams (FRIB) heavy ion sup all ions up to MeV/u and be goals with pre to accelerate s from the ion s energy of appr the uranium be of the linac different char simultaneously stripper is a c deposited (app by the beam project we hav program that in foils, liquid l strippers. We different option The general Figure 1, whe indicated. No because of the Figure 1: Gene arrows indicate A research strippers was gain confidenc mechanical is ____________________________ * This material is Energy Office of SC0000661 # [email protected]. DEVEL Y.M A. Hershc rtment of Ene ) at Michigan perconducting o uranium wit eam power up esent ion sourc imultaneously ource in the fi roximately 16.5 eam to reduce to achieve th rge states are y after the s hallenging pro proximately 0. in a small sp ve established ncludes severa lithium films, present in th ns. INTROD layout of the ere the stripper stripper is p limited benefi eral layout of th e the beam dire SOLID ST program to s established at ce in the unde ssues associa ________________ based upon work Science under Coo edu OPMENT F. Mart Momozaki, J. covitch, P. T rgy Facility fo n State Univer linac capable th energies hi to 400 kW. T o e performance two charge sta irst section of t 5 MeV/u it is p the voltage ne he final energ planned to stripper. The oblem due to t 7 kW) in the ot. To assure a research an al options: carb , gas stripper his paper the DUCTION FRIB facility r location at th planned at the it obtained from he FRIB driver ection. TRIPPER study the feas t MSU. The p erstanding of th ated with the supported by the D operative Agreeme T OF STR ti # , FRIB, Ea . Nolen, C. R Thieberger, B or Rare Isotop rsity includes of accelerating igher than 200 o achieve thes e it is necessary ates of uranium the linac. At an planned to strip eded in the res gy. Up to fiv be accelerated design of th the high powe stripper medi success of th nd developmen bon or diamond rs and plasm status of th [1] is shown in he first bend i e second bend m it. r linac. The red ibility of solid purpose was to he thermal and e high powe Department of ent DE- RIPPER O ast Lansing, Reed. ANL, BNL, Upton e a g 0 e y m n p st e d e er a e nt d ma e n is d d d o d er deposition estimate solid foils to the hig 16.5MeV/ was chang losses in Scanning and irradi this work [2]. Figure 2: (left, show beam at thinning w L One of th stripper b (ANL). A lithium ta of 20 kW and the li accelerato speed (> demonstra Figure 3: original A being test ANL is n reproduci PTIONS F MI, U.S.A. Argonne, IL , Long Islan n. It was demo the temperatu s, but the radia gh energy los /u dE/dx ~ 25 ging extremely n the followin Electron Mic iated foils are s are discussed SEM photog wing a pinhole 8.1 MeV/u. S was produced. LIQUID LIT he most prom eing developed ANL previousl arget streaming W at very high iquid lithium s or environmen 50 m/s), thin ated in a vacuu Liquid lithium ANL experimen ted with water now working t bility, necessar FOR FRIB L, U.S.A. d, NY, U.S.A onstrated that w ures and sublim ation damage te ss rate for the keV/nm) the t y fast, unaccep ng linac acce roscope photo shown in Figur in another pap graphs of an u e) and of a foil Significant stru THIUM ST mising options d at Argonne N ly demonstrate g at a few m/s power density system operate nt [3]. Also (~10 μm) liqu um environmen m flow producin nt (left). Impro (right). to improve th ry for reliable B* A. we could accu mation rates o ests showed tha e heavy ions thickness of th ptable because elerating segm os of the unex re 2. More deta er at this confe unused carbon irradiated with uctural change TRIPPER is a liquid li National Labor ed that a thick can dissipate p y (up to 2 MW ed well in a ty previously a uid lithium film nt [4], see Figu ng a thin film oved deflector he film stabilit linac operation urately of the at due (U at he foil of the ments. xposed ails on erence n foil h a Pb es and ithium ratory liquid power W/cm 3 ) ypical high- m was ure 3. in the shape y and n, and TUP106 Proceedings of Linear Accelerator Conference LINAC2010, Tsukuba, Japan 662 03 Technology 3H Other Technology
Transcript of OPMEN T OF ST R IPPER O PTIONS F OR FRI B · nergy of app r he uranium b e f the linac ifferent...
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Abstract
The US DeparBeams (FRIB)heavy ion supall ions up toMeV/u and begoals with preto accelerate sfrom the ion senergy of apprthe uranium beof the linac different charsimultaneouslystripper is a cdeposited (appby the beam project we havprogram that infoils, liquid lstrippers. We different option
The general Figure 1, wheindicated. No because of the
Figure 1: Genearrows indicate
A research strippers was gain confidencmechanical is ____________________________* This material is Energy Office of SC0000661 #[email protected].
DEVEL
Y.MA. Hershc
rtment of Ene) at Michigan
perconducting o uranium witeam power up esent ion sourcimultaneously ource in the firoximately 16.5eam to reduce to achieve th
rge states are y after the shallenging proproximately 0.in a small spve established ncludes severalithium films,present in th
ns.
INTRODlayout of the
ere the stripperstripper is p
limited benefi
eral layout of the the beam dire
SOLID STprogram to sestablished at
ce in the undessues associa________________
based upon work Science under Coo
edu
OPMENT
F. MartMomozaki, J.covitch, P. T
rgy Facility fon State Univerlinac capable th energies hito 400 kW. Toe performancetwo charge sta
irst section of t5 MeV/u it is pthe voltage ne
he final energplanned to
stripper. The oblem due to t7 kW) in the ot. To assure a research an
al options: carb, gas stripperhis paper the
DUCTION FRIB facility r location at thplanned at theit obtained from
he FRIB driverection.
TRIPPER study the feast MSU. The perstanding of thated with the
supported by the Doperative Agreeme
T OF STR
ti#, FRIB, Ea. Nolen, C. R
Thieberger, B
or Rare Isotoprsity includes of accelerating
igher than 200o achieve these it is necessaryates of uraniumthe linac. At anplanned to stripeded in the res
gy. Up to fivbe accelerateddesign of ththe high powestripper medisuccess of th
nd developmenbon or diamondrs and plasm status of th
[1] is shown inhe first bend ie second bendm it.
r linac. The red
ibility of solidpurpose was tohe thermal ande high powe
Department of ent DE-
RIPPER O
ast Lansing, Reed. ANL, BNL, Upton
e a g 0 e y
m n p st e d e
er a e
nt d
ma e
n is d
d
d o d
er
depositionestimate solid foilsto the hig16.5MeV/was changlosses inScanning and irradithis work [2].
Figure 2:(left, showbeam at thinning w
LOne of thstripper b(ANL). Alithium taof 20 kWand the liacceleratospeed (> demonstra
Figure 3:original Abeing test
ANL is nreproduci
PTIONS F
MI, U.S.A.Argonne, IL, Long Islan
n. It was demothe temperatus, but the radiagh energy los/u dE/dx ~ 25 ging extremely
n the followinElectron Mic
iated foils are sare discussed
SEM photogwing a pinhole8.1 MeV/u. Swas produced.
LIQUID LIThe most promeing developed
ANL previouslarget streaming
W at very high iquid lithium sor environmen50 m/s), thin ated in a vacuu
Liquid lithiumANL experimented with water
now working tbility, necessar
FOR FRIB
L, U.S.A. d, NY, U.S.A
onstrated that wures and sublimation damage tess rate for the
keV/nm) the ty fast, unaccepng linac acceroscope photo
shown in Figurin another pap
graphs of an ue) and of a foil Significant stru
THIUM STmising options
d at Argonne Nly demonstrateg at a few m/s power densitysystem operate
nt [3]. Also (~10 μm) liqu
um environmen
m flow producinnt (left). Impro(right).
to improve thry for reliable
B*
A.
we could accumation rates oests showed thae heavy ions thickness of th
ptable because elerating segm
os of the unexre 2. More detaer at this confe
unused carbonirradiated with
uctural change
TRIPPER is a liquid li
National Labored that a thick can dissipate p
y (up to 2 MWed well in a typreviously a
uid lithium filmnt [4], see Figu
ng a thin film oved deflector
he film stabilitlinac operation
urately of the at due (U at
he foil of the
ments. xposed ails on erence
n foil h a Pb es and
ithium ratory liquid power
W/cm3) ypical high-
m was ure 3.
in the shape
y and n, and
TUP106 Proceedings of Linear Accelerator Conference LINAC2010, Tsukuba, Japan
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3H Other Technology
tfb
Vt
cefd
itwl
Fl
F
to measure thefilm thickness been made to t
(1) new n(2) new d(3) new t
future(4) additi
system(5) new v
changVarious waterthe nozzle desstability, Figuclosely with Aexperiments, nfabricated. Adesigned to fasupport was fain progress. thermal sensinwill be installeliquid lithium e
Figure 4: Vaclithium strippe
Figure 5: E-gu
e exact film thi(~0.5 mg/cm2
the existing liqnozzle, deflector and itthermal sensinge fully-automation of an e-beam (EMS) [5], vacuum chambges. r experiments sign and the deure 3. A.M. GANL to providnew nozzles anA new deflectacilitate changabricated and aA new liquid
ng technique haed on the systenvironment.
cuum chamber er.
un thickness me
ickness to mat2). Many mod
quid lithium sys
ts support systeg, liquid metal tic operation,
am thickness m
ber to accommo
were performeflector designGatti Inc. has de all nozzles. nd new deflecor support sy
ging the deflecassembled andmetal level p
as been also detem to test its
developed to
easuring system
tch the requireddifications havstem, including
em, level probe fo
measurement
odate above
med to improvn for better film
been working Based on th
ctors have beenystem was alsoctor. The newd testing is nowprobe based oneveloped. Thireliability in
test the liquid
m (EMS).
d e g
r
e m g e n o w w n is a
d
Once reliaintegratedautomaticAn EMS confirmedthickness GSI and film targereconfigulithium sythe system The new the old veasy instaadditionalfuture inteAssemblyfirst Li floAs in acontaminaline of scavities w
Figure 6:
The advandisadvantwhen comrelevant wdone at Restimated (16.5 Mestripping (or liquidseven mcompensaThe RIKEtarget dethicknesseRIKEN equilibriuis lower tthickness
able operation d into the existic operation of t
was built at d [5]. Note th
measurementhas been succets [6]. The red so that itystem. Testingm are now in pr
vacuum chamvacuum chamballation of thel ports for the Eegration with ay of the overallow is expectedall stripper opation of the neight is allowe
while traps will
Vacuum cham
GAS ntage of a gas
tage is the lowmpared to solwork on gas sRIKEN by H.
from their expeV/u) the averis 64+ well be
ds) (78+). This more cryomodate the lower enEN gas cell iescribed in [es of 1 mg/cmexperiments
um is reached bthan the corres
at this ener
is shown, thising control systhe Li system.
ANL and itshat a similar, t system was cessfully operaexisting EMSt can be moug the system arogress.
mber was fabrber. The newe deflector supEMS installatioan ion beam linl system is >90 soon. ptions it is
earby superconed between thbe setup betw
mber (left) and l
STRIPPINs stripper is its
wer average chlid or liquid sstrippers for h
Okuno and Hperiments that rage charge stelow the expec
lower charge dules of the nergy gain. is based on t[8] and basem2 have beenwith N2 ga
below 0.2 mg/sponding solidrgy, but prob
s level probe cstem, allowing
s effectivenesse-beam-basedpreviously bu
ated with solidS of ANL hasunted to the and re-calibrati
icated and repw chamber propport and has on, viewing, anne, see Figure 40% complete an
crucial to prducting cavitiehe stripper aneen them.
lithium tank (ri
NG s simplicity, b
harge state prostrippers. The
heavy ions hasH. Kuboki [7]
at the FRIB etate expected cted value for state would reβ=0.53 typ
the windowlesed on [9]. Tn achieved, buas show that/cm2. This thic
d carbon equilibably similar
can be fully-
s was d, film uilt at d thin- been liquid ion of
placed ovides many
nd the 4. nd the
revent es. No nd the
ight).
ut the duced most
s been . It is
energy for U solids equire pe to
ss gas Target ut the t the ckness brium lower
Proceedings of Linear Accelerator Conference LINAC2010, Tsukuba, Japan TUP106
03 Technology
3H Other Technology 663
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charge states cthickness. This chamber cobtaining presvacuum chambTorr.
GAS S
Another signif[7] is the deelectron loss cthat if equiliaverage charghigh as for soliDue to the difstarted a progr(BNL) to dewindows. TheA. Hershcoviimprovement obtained in thepumping whileThe same expdegree of heliwindows, altho80. A demonstratioimplemented astability and peBNL Au beam
Figure 7: Skettest with two pthe plasma win
The plasma wi(MIT) and froapertures of osuccessful wediameter) at M
The use of a ptheir experimecm-3 was achiplasma generanot in the DCstudy the gene
could be achie
consists of foussures below 6ber at a consta
STRIPPINGWIND
ficant result frtermination thcross sections ibrium thicknee state for U id strippers. fficulties of obram with Broo
evelop a gas e plasma windoitch at BNLof a factor o
e low pressure e the high presperiment showium gas can bough the factor
on setup with tat BNL with therforming char
m, Figure 7.
tch of the expplasma windowndows.
indows have bom the APS (only 3mm, bute plan to bui
MSU to continu
PLASMA Splasma strippe
ent [11] a free eieved, but wit
ation. This is pC conditions oferation of wall
eved with carbo
ur differential p6 10-6 Torr inant target gas
G WITH PLDOWS rom the RIKEhat the electrofor U in heliuess could be stripping in H
btaining thick okhaven Natio
cell containeows have been
L [10]. In tof ~ 230 in side compared
sure side was awed that a higbe achieved wr of 230 was re
two plasma wihe purpose if erge state experi
perimental setuws. A gas cell
been borrowed ANL). These t if the proof ild larger wine the developm
STRIPPERer has been teelectron densityth 50 MW ofossible in a puf FRIB. The Band vortex stab
on at this sam
pumping stagesn the outermos
pressure of 50
LASMA
EN experimenton pickup andum gas indicat
achieved thHe could be a
He targets wonal Laboratoryed by plasmn developed bythis setup anpressures wa
d to differentiaat atmosphere.gh containmen
with the plasmeduced to abou
indows is beingestablishing thiments with th
up for the BNLis enclosed by
from D. Lanzwindows havof principle i
ndows (6 mmment.
R sted at GSI. Iny up to 5.5 101
f power in thulsed mode, buBNL team wilbilized plasma
e
s, st 0
ts d te e
as
e y
ma y n
as al
nt a
ut
g e e
L y
a e is m
n 19 e
ut ll
as
to achievewithin respeculativstrippers h
A diverseFRIB strcollaboratparticipatibeing follby the end
We woulhospitality
[1] R. C.Rare paper
[2] F. Mpaper
[3] J. A.IrradiRev.
[4] Y. MLithiuStripp
[5] S. KoInjectPAC0
[6] R. MScien
[7] H. Ocomm
[8] T. Kseconand M
[9] K. SaNucleResea
[10] A. HatmoelectrmeltiJ. Ap
[11] A. GeffectinteraPhysi
e the maximumeasonable powve than the prehave the potent
SUe R&D programripper develoption with ANing in it. Selowed with thed of 2011.
ACKNOWld like to thay and generosi
REF York et al, “SIsotope Beam
r at this confereMarti et al., “A
r at this confere Nolen et al.,iated by 1 MeSci. Instrum. 7
Momozaki et um Thin Filmper”, JINST 4ondrashev et altor for Liquid09 (2009) TU6
Mann et al., ntific Report 20Okuno and Hmunication 201Kishida et al.,ndary beam pMethods in Phyagara et al., “Aear Instrumenarch A 378 (19
Hershcovitch, sphere interfacron beam weng, and nonva
ppl. Phys. 78 (1olubev et al., “tive charge action”, Nucleics Research A
m possible denswer requiremenevious stripper tial for very hi
UMMARY m is being carripment. It is NL, BNL, R
everal promisie goal of selec
WLEDGEMank the RIKEty in sharing th
FERENCESStatus and Planms at Michigan
ence. Carbon Foil
ence (TUP105, Behavior of eV Electron B76 (2005) 0735al., “Develop
m for Use as a(2009) P0400l., Upgrade of
d Lithium Film6RFP048.
“On-line tar003, 224. H. Kuboki, 10. “A windowl
production”, Nysics ResearchA blow-in windnts and Me996) 392. “High-pressurece and plasma elding machinacuum ion mat1995) 5283. “Experimental state of ionsear Instrument
A 464 (2001) 24
sity of free elecnts. Although alternatives, pgh charge state
ied out as part a multi labor
RIKEN and ing approachecting the techn
MENTS EN team for heir results.
S ns for the Facilin State Univers
Stripper for F). Liquid Lithiueams up to 20
501. pment of a La Heavy Ion 5. the FRIB Prot
m Testing, Pro
rget control”,
(RIKEN) per
less gas targeNuclear Instru. A 438 (1999)dowless gas taethods in Ph
e arcs as vaclens for nonva
nes, electron terial modifica
investigation s in beam–pts and Metho47.
ctrons more
plasma es.
of the ratory MSU
es are nology
their
ity for sity “,
RIB”,
um Jet 0 kW,
Liquid Beam
totype oc. of
GSI
rsonal
et for ments ) 70. arget”, hysics
cuum-acuum beam
ation”,
of the plasma ods in
TUP106 Proceedings of Linear Accelerator Conference LINAC2010, Tsukuba, Japan
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