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L

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7, 7

# P .

iron/ −metal box µ He( e, e’p )X ³

He( e, e’p )X ³ proton from

He( e, e’n )X 3

neutron from

10 A µ

78.6 25

32.2

spectrometer B spectrometer A

o o o

electron from electron from or

or He( e, e’n )X 3

He( e, e’ ) He 3 ³

hadron detector lead shielding electron beam

855 MeV

target cell

4 bar

1

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Trigger Detectors Scintillation

Focalplane Track Detector

VDC3, VDC4

VDC1, VDC2

Photomultiplier VUV Mirror Cherenkov Detector

E ₁

∆ ∆

Cerenkov Radiator ²

E 2

(CF Cl ) ₂

1

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SPLITTER PM _up

PM _down

SPLITTER

... AND AND

OR

SPLITTER

towards ADC

towards TDC (stop)

spectrometer A

TDC start ADC gate

scintillator

the 19 other bars

towards TDC (stop)

towards ADC

th

1

% . # /, .

% '% C% .

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Q? Q> " -

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%

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% !

1 2 3

without Cs+O layer 2

2

vacuum energy with Cs+O layer surface extraction transport

vacuum energy

photon absorption

vacuum semiconductor

polarized photon

conduction band

valence band

1

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2 P ³ ₀

( m =+1) ∆ _F

4 1

2 3

0 B

1 S 1 _F=1/2 m =+1/2 F

m =−1/2 F F

m =+1/2 F F F

m =+3/2 m =−1/2 m =−3/2 F=1/2

2 S ³ ₁

m =+1/2 F

m =−1/2 F

F=3/2 (towards all m ) _F

m =+1/2 F

m =−1/2 F

F=1/2

RF discharge

right handed photon absorbtion

metastability exchange collision

magnetic field (10 G)

isotropic reemission

1

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% .

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#

( ' ' ) 6* * % 0 / %! .. ! ") * ". ! . . ' / 2 %* "!( " '( ) (. 0 $! ! ) '*

" 0 ( 3 1

beam axis Cs −reservoir

Quartz cell

coated with gold Copper foils glass valve

1

% . # D, !& ! % % .

! -

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% "! ! % "!% !% " - '% .

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!%

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% " -

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! 2

* /4 +56 7 8:9

;

< =! 7 + / "

6 - +

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! +

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# /1

/

. 2 =

6 4 / " /! # /5?

@ AB CDEF G H I I I# 76 "-KJ L ! "5'

M N "* 4 3 +

# / /O - / "* /4 + =

? PQ ! 5 ! 6 N + R 8

# S

% T U

' V

6 W / /

- ! " /! 56 4 ! . /

. / 0 /

. 6 7

-6 . ! "* >! +*6 4 = +! " / +5 Q / " / # ! 4 / 2 +Q 6 +* /5 ! 2! ,

'

% R

4 / 6 N. 2 +#* 4 W +# ! + +# / /! .6 6 5 /5 56 /-6 . ! "* >! +*6 4 Q # /4 "6 5 5* 4 3 +# / +! " 3 / +

Q * 4 26 Q 5 $% 8 (

' N + 5 N # .6 5 5 /5 ! " / 4 / 3

.* 3

* . /' 4 2 / / 2 = 76 ..6 Q * 4 3 SL R U = +# /

" /

. ! +* 0 /.6 5 56 7-6 . ! "* >! +*6 4* 5

G ; ! =

Q # / " /" 9 # $ % &' ( )* 5

+

# / 6 ..* 5*6 4 /4 / " 3 ,

.6 5 5 +* /5 +# / "! 2* ! +*6 4 . /4 3 +# =* * 5 +# / /! /4 / " 3 , ! 4 2

+ , -' ( )* 5 +# / +6 +!. /4 / " 3 ,

.6 5 56 7 +# / /. / + "6 4* 4 +# / 6 - - / "Q * 4 26 Q '

V# /! 56 . N + /-

6 . ! "* >

! +

*6 4 .

F 6 7 +

# / +! " 3 / +

* 5 /! 5 N " / 2 N5

* 4 3 +

# // 2

* ! ! +

* 0 ! 5 +

1! 5 5! 3 / + / # 4*

2 N / $

/ 0 1 ( SL L U

' / 0 1 6 4 5* 5 +5* 4 " / 0 / "5* 4 3 +# / 2* " / +*6 46 7 +# /

( 5-* 4 5 , /! 4 56 7! "

! 2

*6 7" / 2 N /4 , /O

* +! +

*6 4' 3 /! 5 N "* 4 3 +

# / ! 34 / +

*

1 /. 2 / 76 " /! 4 2! 7+ / " +# / 5-* 4 5 # ! 4 3 / +# /* " 2* " / +*6 4 =

6 4 / 5 / /5 ! 1 /. 2 4 N - / 2 N!.

+

6 +Q 6 +* /5 +# /1 /. 2* 4 2 N / 2 , +# / -

6 . ! "* > / 2 +! " 3 / +' )* +# +# / W46 Q . / 2 3 /6 7

+

# / /. . 3 /6 / + " ,! 4 2- " /5 5 N " / =

6 4 / " / 6 0 / "5 +# /-

6 . ! "* >! +*6 4 Q * +# ! 4 ! N "! ,

6 7

! 6 N + R 5 S

% T U

' / 0 1 /! 5 N " / /4 +5Q / " / 26 4 /! 7+ / " /! # 5-* 4 "6 +! +*6 4 $ G / 0 / " , R

#6 N "5 (

' V6 6 4* +6 " +# /.6 5 56 7-6 . ! "* >! +*6 4 7! 5 + / " =56 / 6 -. / /4 +! " ,76 N . /! "

3 ! 34 / +* 8 /56 4 ! 4 / /! 5 N " / /4 +5 $

6 3 8 (

Q / " / 26 4 / / 0 / " ,# !. 7#6 N "' 96 Q / 0 / " =

6 3 8 /! 5 N " / /4 +5 3

* 0 /6 4.

, ! " /. ! +* 0 /-

6 . ! "* >! +*6 4 /! 5 N " / /4 +' / ! N5 /6 7

+

# / N4 ! 06 * 2! . / /

. / + "

6 ! 34 / +

* 4

6 * 5 /

* 4 +

# / /O - / "* /4 +

!. # !. . = +

# /5

* 34 !. +6 4

6 * 5 /

"

! +*6 6 7 +# /6 3 8 /! 5 N " / /4 +5* 5 2 N* + / ! 2 =! 5* 5 " / 0 /!. / 2 , ! 5* -. /.6 6 W! +

1 3

' %' H I

' V# N5 = +

# /6 3 8* 5.

/5 5 ! N "

! + /! 5 +

# // 0 1'

:; <; : = > ?A@ BCD EF BG HI J

CD KD L >CDI @

V

6 - "

6 + / + +

# / 3

! 5 ! 3

!* 4 5 + /O + /

"4 !. ! 34 / +

* 1

/

. 25 =

Q #*

# 6 /6 5 +

. , 7 "

6 +

# /

5- / + "6 / + / "5 = +# / +! " 3 / +* 5 W /

- +* 4 ! 4 * "6 4M

M / +!. 6 O 5#6 Q 4 * 4 1 3

' % ' T' V# /

5-* 4M #6 . 2

* 4 31 /

. 2 $ G TN ! N5 5 (

* 56 +

!* 4 / 2 N5

* 4 3 +

# " / / !* 4 6 *. 5

5#

6 Q 4 * 4

1 3

' %' T'

)* +# +# /5 /#6 . 2* 4 31 /. 25 !.6 4 / = " /. ! +* 0 /1 /. 2 3 "! 2* /4 +5 ! 5. ! " 3 /! 5 O9

;QP

P P

! 4 / 5 / /4 , +

# / (! +6 5 =

. /! 2

* 4 3 +6 ? RSTUV WXY G ;# ' V

6 6 " " / + 5 N

# * 4M

#6 6 /4 /* +* /5

= /! # 6 7 +# / !* 4 6 *. 5* 5 6 N-. / 2 +6 76 N " 5 !.. / " 6 " " / +*6 4 6 *. 5

x z

y

target

box

coil giving the z component of the field

coil giving the y component of the field coil giving the x component of the field

0 * 3 N " / %' T V! " 3 / +6 O Q * +# 6 *. 5 2 /1 4* 4 3 +# /1 /. 2 2* " / +*6 4'

4.

,

6 4 / + N "4

- / "

6 *. * 5 2 "!Q 4'

$ N " " /4 + 2

* 0

* 2 / "5#6 Q 4* 4 1 3

' % ' (

'

V# /1 /. 2 C- "6 2 N / 2 ,! 6 " " / +*6 4 6 *. * 5

C # . C # 9" C ;

%

&

$&%' R (

Q # / " /"

C

* 5 +# / N " " /4 +- ! 5 5* 4 3 +# "6 N 3

# +# / 6 *. ' +5 ! -. * + N 2 /* 5 2 / + / "* 4 / 2

, +# /-

6 + /4 +*6 / + / " " /5* 5 +! 4 / 0!. N /' V# /- "6 -

6 " +*6 4 !.* + , 7! +6 " . C # 2 /

- /4 25

6 4.

,

6 4 +# / 3 /6 / + " ,

6 7 +# / 6 *. ' 1 "! +* !.. , =

A E C # ! 4 2 . C # ! " / !/ 5 N " / 2

,

5Q * +#* 4 3

6 46 4. ,

6 4 / 6 *. ! +! +* /' + + N "4 / 26 N + +# ! +!.. 1 /. 25 ! 4 /1 + + / 2

Q * +# 1 "5 +6 "5 / 6 4 26 " 2 / "-6 . ,46 * !. 5' ) "* +* 4 3

. C # C# C# C

$&%' L (

A E C # # # $&%' 8 (

+

# / +6 +!. 1 /. 2 / 6 /5

F F A # <

C P C9" C 9 # <

C P

C9" C 9 # <

C P

C9" C , $&%' (

% 8

r 1 r 2 r 4

I ¹ I ² I ⁴

r 3

I ³

R 4

R 3

R 2

R 1

main coil

correction coil 1 correction coil 2 correction coil 4 correction coil 3

I

0 * 3 N " / % ' 6 *. 5 N " " /4 + 2* 0* 2 / "

V# / 3 "! 2* /4 +5* 4 +# /6 O ! " / " /6 0 / 2 , 5 / + +* 4 3 +# /-

6 + /4 +*6 / + / "5* 4 ! Q ! , +# ! +

+

# /-6 . ,46 * !. 6 / * /4 +5 0! 4* 5# '

06 " +#* 5 /O - / "* /4 + =

Q / 2 / * 2 / 2 +6 * 4* * > /

! 4 2

' / Q * 2 / "! 4 3 /6 7

N " " /4 +5 !..6 Q 5 76 " +# /* 4* * >! +*6 46 7 +# /5 / +Q 6 3 "! 2* /4 +5'

9

6 Q / 0 / " =

6 4 /4 / 3

. / +5 +# / >! 4 2 , 2 /

- /4 2 /4 /6 7 +# /1 /. 2 6 -

6 4 /4 +5' 36 " /6 0 / " =

6 4 /

5#

6 N

. 2!. 56 * 4* * > / +

# / +Q 6 6 +

# / " ! " + /5

* ! 4 6 -6 4 /4

+56

7 +

# /1

/

. 2Q * +

# +

# /

5! / 76 N " 6 " " / +*6 4 6 *. 5' +* 5 . /! " +# ! + +# / 2 / 3 " / /56 7 7" / / 26 6 4 /# ! 5 +6 ! 4 /.

3 "! 2* /4 +5 ! " / 0 / " , " /5 + "* + / 2' 4 - "! +* / =

* +* 5* -6 5 5* . / +6 ! 4 /. !.. 3 "! 2* /4 +5

Q * +# 6 4.

, 76 N " 6 *. 5' V# /1 /. 2#6 6 3 /4 /* + ,Q ! 5 5 N * /4 + +6 !..6 Q 76 "! .6 4 3

+

! " 3 / + " /. ! O ! +*6 4 +* / N +46 + 3

6 6 2 /46 N 3

# 76 "6 3 8 /! 5 N " / /4 +5Q #* # Q / " /

2 N* + / 5 /4 5* +* 0 / +6 ! 34 / +* 1 /. 2 3 "! 2* /4 +5' V#* 5 ! 4 / 5 / /4 7 "6 1 3

' % ' H IQ #* #

5#6 Q 5 #+ ! + #+ /5# ! - 6 / 7# + / 7 " /*/ 4 2 N *6 + 4 2 /! ,

* 5 2* / " /4 + 7 "6 6 4 /! 4 3

. / +6 +# /

6 +# / "' V#* 5* 5 ! 6 4 5 / 2 N /4 /6 7! 4 ! - - "6 O* ! + /1 /. 26 - +* * >! +*6 4' / 56 N +.* 4 / 2

* 4 / - - /4 2* OM / =! 6 " / "* 3

6 "6 N5 ! - - "6 ! # * 3

# +- ! " +* !. . ,

* - "6 0 / +# /5* + N! +*6 4 '

! " # $

% & '

( !

! ) ( # * & + ! )

( ! ' /#

0 200 400 600 800 1000 1200 1400 1600 -100

-50 0 50 100

0 200 400 600 800 1000 1200 1400 1600

-100 -50 0 50 100

0 200 400 600 800 1000 1200 1400 1600

-80 -60 -40 -20 0 20 40 60 80 100

0 200 400 600 800 1000 1200 1400 1600

-80 -60 -40 -20 0 20 40

212 60

122 32

302

time, a.u.

time, a.u.

time, a.u.

fid amplitude, a.u. fid amplitude, a.u. fid amplitude, a.u. fid amplitude, a.u.

time, a.u.

0 * 3 N " / % ' H I # ! - /6 7 +# / 7" / /* 4 2 N +*6 4 2 / ! ,! + 2* / " /4 + 5-* 4 ! 4 3

. /5

<; ; @ C I H ECDI @

/ ! N5 /-" 6 +6 4 5!" /*6 4* >* 4 3-!" +* . /5 = +# / , 2 /

-

6 5* +! 5* 3

4* 1 ! 4 !$+ 6 N4 6 + 7 /4 " / 3 ,

* 4 +# /% & -! 2 2

. /5' V# /

" / 7

6 " /

=-

" 6 +6 4 5!" / / 0 /4 +5 7" 6$ +# / N- - /

" -! " +6 7 +# /

/ M 5- / +" N$ 6 7 +# /% & -! 2 2. /5 (

5 / /1 3

' R' H )

'

∆ E

0 100 200 300 400 500 600 ADC 700

counts

0 10000 20000 30000 40000 50000

protons

0 * 3 N

" / R

' H % M -! 2 2

. / 5- / +

" N

$ Q * +# +# /-" 6 +6 4 N +

5 N! .. , =

6 4 / 2 /1 4 /5 ! 5 -" 6 +6 4 5 +# / / 0 /4 +5 76 " Q #* # +Q 6 % & -! 2 2. /5 #! 0 /

! . !" 3

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