JLab e CEBAF
100m
5 Recirculation Arcs
Central Helium Liquefier
JLab12
Prima Riunione Plenaria
0.6 GeV Linac
18 Settembre 2008
0.6 GeV Linac
45 MeV
Injector
Extraction
element
End Stations
Energy : 1.2 - 5.7 GeV
Max current : 200mA
Polarization : ~80%
Simultaneous delivery to 3 Halls
18 Set 2008
JLab12.0
Jefferson Lab
18 Set 2008
JLab12.0
3 End Stations
18 Set 2008
JLab12.0
Hall A: Two High Resolution (10-4) Spectrometers
L[cm-2s-1] = 1039
18 Set 2008
JLab12.0
Hall B: The CEBAF Large Acceptance Spectrometer (CLAS)
L[cm-2s-1] = 1034
18 Set 2008
JLab12.0
Hall C: A High Momentum and a Broad Range Spectrometer
L[cm-2s-1] = 1039
18 Set 2008
JLab12.0
12
116 GeV CEBAF
Upgrade magnets
and power
supplies
CHL-2
~ $310 M
Two 1.1
0.6 GV linacs
Enhanced capabilities
in existing Halls
18 Set 2008
Lower pass beam energies
still available
JLab12.0
12 GeV Equipments (>2013)
18 Set 2008
JLab12.0
JLab/Finanziamenti e organizzazione
Finanziamenti: DOE (+ NewPort News + Virginia)  JSA
18 Set 2008
JLab12.0
JLab/Info Pratiche
• Web Page: www.jlab.org
• Registration and Training
– Richiede un paio di giorni, gran parte può essere
svolto da web
– I diversi training hanno scadenza annuale o
biennale
– il badge permette di accedere agli uffici, laboratori,
acceleratori, secondo il tipo di training acquisito
• Business Visa richiesta per lavorare al JLab
• Foresteria (ResFac)
• ….
18 Set 2008
JLab12.0
Hall A
JLab12
Prima Riunione Plenaria
18 Settembre 2008
18 Set 2008
JLab12.0
Hall A
• Alta luminosità
• Ottima risoluzione momento/angolo
• Sofisticato PID
• Flessibilità della configurazione sperimentale
• La sala sperimentale più grande di JLab
18 Set 2008
JLab12.0
Hall A: Apparati 1
2 High Resolution
Spectrometers
BigBite:
Large Angular Acceptance
18 Set 2008
JLab12.0
Hall A: Apparati 2
18 Set 2008
JLab12.0
Hall A: Apparati 3
• DVCS Calorimeter
• Polarimetri Moller e Compton
• Bersagli di H, D, 3He, Be, C, Li, 16O, Pb, …
• Bersaglio polarizzato 3He (n)
18 Set 2008
JLab12.0
Hall A : Esperimenti
Number
Approved
Days
Polarized
A
Number
Approved
beam
status Completed
Days
run
Number
Jeopardized
Days
to be run
Nucleon and Meson
Form Factors/Sum Rules
Few Body Nuclear
Properties
Properties of Nuclei
12
235
10
9
11
212
2
23
18
281
8
4
16
246
6
35
11
200
2
5
7
135
7
91
N* and Meson Properties
10
170
9
4
4
91
2
79
Strange Quarks and
Parity Violation
Total
7
183
5
6
5
130
1
53
58
1069 34
28
43
814
18
281
Conditionally Approved
2
0
0
0
0
Average time completion-submission of experiment: 20 months, 75% within 3 years
Hall A running for 10+ years, with an average publication output of 4+
Top cited Hall A publications: 2 250+, 13 50+
18 Set 2008
JLab12.0
Hall A: Tentative Plan 6 GeV
2008
2009
2010
2011
2012
10 11 12 1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5
Transversity (TMD)E06-010
d2 (DF)
E06-014
3He SSA (GPD) E05-015
3He AxAy
E05-102
HAPPEX III
E05-109
PV-DIS
E08-011
PREX
E06-002
DVCS (GPD)
E08-027
Deuteron Near ThrE08-008
SRC
E0'7-006
N-Delta (SRC) E08-010
g2p (res)
E08-027
GEP Low Q2 E08-007
Hypernuclear 16OE07-012
18 Set 2008
JLab12.0
Hall A: Upgrade per 11 GeV
Existing Equipment
Baseline ($2 M):
• DAQ per alta luminosità
• Beam line per migliore qualità del fascio e misura
(Moller and Compton Polarimeter)
Nuovo apparato ($2 M):
• Super BigBite Spectrometer:
• large acceptance,
• forward angle
• moderate momentum
and angle resolutions
• versatile detectors
• Hadron PID
18 Set 2008
JLab12.0
Hall A: Approved Exp. 12 GeV
• DVCS: Measurements of Electron-Helicity Dependent Cross Sections
of Deeply Virtual Compton Scattering with CEBAF at 12 GeV
• A1N: Measurement of neutron asymmetry A1n in the valence quark
region using 8.8 GeV and 6.6 GeV beam energies and Bigbite
spectrometer in Hall A
• GMP: Precision Measurement of the Proton Elastic Cross Section at
High Q2
• GEP/GMP V: Large Acceptance Proton Form Factor Ratio
Measurements at 13 and 15 (GeV/c)2 Using Recoil Polarization
Method
Hall A sarà la prima sala ad essere servita dal nuovo fascio
(dopo il 2013 ?)
18 Set 2008
JLab12.0
Hall A Management and
Structure (da franco)
18 Set 2008
JLab12.0