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6 April 2006, LG Status Report Beam Working Group 1
Beam Working Group Status Report
6 April 2006
Presented by Lau Gatignon
Cedar status
MNP33-2
Outgassing studies
Beam design
6 April 2006, LG Status Report Beam Working Group 5
Beam
DiaphragmMany PMT’s
Light
condensor
Cedar design:Use ellipsoidal mirrors (tilted at 45o) to produce larger light spot
Use segmented photon detectors to lower rate per channel
Simulation includes:
• absolute production rate according to Npe = No L sin2
with No = 370 eV-1 cm-1 e E over range 2000-6000 Å
• parabolic approximation of quantum efficiency:25% at 4000 Å, 9% at 2000, 6000 Å
• 10x10 mm2 PMT’s with 8x8 mm2 sensitive area
• Cedar without ‘nose’, realistic beam parameters, scattering in H2
6 April 2006, LG Status Report Beam Working Group 6
2000 3000 4000 5000 60000.00
0.05
0.10
0.15
0.20
0.25
0.30Q
uan
tum
eff
icie
ncy
Wavelength [Angstrom]
6 April 2006, LG Status Report Beam Working Group 7
100 transverse ,140 radial[2800,4400 A]
60x30 mm2 light spot!
X of seen p.e. at PM location [mm]
X o
f se
en p
.e. a
t P
M lo
cati
on
[m
m]
X at PM [mm]
Y a
t P
M [
mm
]
6 April 2006, LG Status Report Beam Working Group 9
OR at each PMT location, ‘old logic’ :50 MHz * 23 PMT out of 8 * 6*3 = 144 8 MHz per PMT
6 April 2006, LG Status Report Beam Working Group 10
Define symmetry of cells hit: Symmetry = 1-(AsymX * AsymY)
Cut
Symmetry Symmetry * #cells hit
6 April 2006, LG Status Report Beam Working Group 11
0 1 2 3 4 5
0.0
0.2
0.4
0.6
0.8
1.0
Cut on Symmetry * Nr cells hit
7 10
9
8
Eff
icie
ncy
Diaphragm aperture [mm]
6 April 2006, LG Status Report Beam Working Group 12
For 1.5 mm diaphragm gap, cut at Symm*Nr cells > 7:
6 April 2006, LG Status Report Beam Working Group 15
Hamamatsu R2248 Divider 1761-22 HV 1200 V Pulser laser 30 MHz
Noise(1 p.e.) 13 mV average, 5 mV sigmaPulse height 66 mV average, 28 mV sigma
Alfredo Placci
6 April 2006, LG Status Report Beam Working Group 17
MAPM H6568 HV 1000VLeft: Pulse rate 30 MHz p.h. 147 mV,sigma 45 mV
Right:Pulse rate 50 MHz, p.h. 140 mV, sigma 40 mV
Alfredo Placci
6 April 2006, LG Status Report Beam Working Group 18
MAPM pulse height vs laser frequency(1.5 ns width, 0.8 ns rise-time)for various HV’s: move 800 V, yellow 900V,blue 1000 V, upper 1100V
Alfredo Placci
6 April 2006, LG Status Report Beam Working Group 19
MNP33-2 requires a field integral 1.333 times higher( 1.2 Tm ) with a similar field distribution in between the 2.4 m pole vertical aperture.
This can be obtained with a slight increase of the magnet length.
The design aim is also to keep the maximum current at a value not too far from that of MNP33-1, for obvious reason of cost optimization
the available power is (from J.P. Burnet information):NR41 - 02 1250A / 600V DCNR31-07+ND31-01 2500A / 600V DC
Marcello Losasso
6 April 2006, LG Status Report Beam Working Group 20
1.7 m
4.4 m
4 m
2.5 m
MNP33-2 upgraded; how it could beMarcello Losasso
6 April 2006, LG Status Report Beam Working Group 21
Bdl is 1.1 Tm in a range -2.5 m to 2.5 m
Bdl is 1.2 Tm in a range -4 m to 4 m
Bmax = 0.36 T
Marcello Losasso
Marcello will provide field map at straw planes – is this acceptable for straws?
6 April 2006, LG Status Report Beam Working Group 22
Total weight of iron is around 130 ton
A cost of 3 ckf/Kg(including machining) can bereasonably expected
Iron price can be estimatedaround 400 Kchf
Marcello Losasso
6 April 2006, LG Status Report Beam Working Group 23
Coil Cross section: 0.29 m x 0.29 mCurrent is 2.3 KA
Conductor is 21 x 21 mm (with 10 mm cooling hole)
Total number of turns x coil is 196 x coil
Current density in Cu is about 7 A/mm2
Total length of conductor x coilis about 3 Km (10 ton)
Marcello Losasso
Update on outgassing measurements
1. Blue tube
2005 test 2006 test
Duration of pumping, days 10 15
Vacuum reached, mbar 3 ·10-5 6 · 10-6
Average outgassing, (mbar l)/(sec cm2) 1.6 · 10-9 4.5 · 10-10
High vacuum outgassing, (mbar l)/(sec cm2) 3 · 10-9 1.35 · 10-9
Outgassing load (high vacuum), (mbar l)/sec 1 · 10-2
Worst (dynamic) outgassing, (mbar l)/(sec cm2) 6.5 · 10-9
Worst outgassing load (dynamic) , (mbar l)/sec 4.8 · 10-2
Preliminary mass spectrometer measurement shows that the main gas component is water
Valeri Falaleev
6 April 2006, LG Status Report Beam Working Group 25
Integrated outgassing, integrated dP/dT
0.00E+00
5.00E-09
1.00E-08
1.50E-08
2.00E-08
2.50E-08
3.00E-08
0 2000 4000 6000 8000 10000Elapsed time, min
Ou
tgas
sin
g,
mb
ar/s
ec
Valeri Falaleev
6 April 2006, LG Status Report Beam Working Group 26
2. Scintillator
20 plate proto in big
tank
2 plates in small tank
CKM
Number of days to reach stable pressure
25 14 5 days of pumping
Average outgassing, (mbar l)/(sec cm2) 7 ·10-10 1.3 · 10-9 6.7·10-9
Worst outgassing , (mbar l)/(sec cm2) 2 · 10-9
Valeri Falaleev
6 April 2006, LG Status Report Beam Working Group 27
Outgassing, dP/dT
5.00E-10
7.00E-10
9.00E-10
1.10E-09
1.30E-09
1.50E-09
1.70E-09
1.90E-09
2.10E-09
1.0 10.0 100.0 1000.0 10000.0
elapsed time, min
Ou
tgas
sin
g,
mb
ar/s
ec
Valeri Falaleev
6 April 2006, LG Status Report Beam Working Group 28
3. Blue tube + Scintillator
Reasonable case
Worst case
Blue tube outgassing load (mbar l)/sec 1 · 10-2 4.8 · 10-2
Scintillator outgassing load (mbar l)/sec 5.1 · 10-2 7.8 · 10-2
Total outgassing load (mbar l)/sec 6.1 · 10-2 1.2 · 10-1
Pump power needed to reach 1 · 10-6 mbar (100% conductance), l/sec
6.1 · 104 12.6 · 104
Blue tube Scintillator
“Reasonable” outgassing, (mbar l)/(sec cm2) 1.35 · 10-9 1.3 · 10-9
Surface, cm2 7.4 · 106 3.9 · 107
Reminder: 5 · 104 l/sec pumps are available on the market
Valeri Falaleev
6 April 2006, LG Status Report Beam Working Group 29
Niels
This is of some importance
already now because it
impacts on the design of
the TAX and the choice of
holes