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 2

CEDAR (plur R.Malleyran), picture from 1976:

6 April 2006, LG Status Report Beam Working Group 3

CEDAR internal structure (+ Claude Bovet)

6 April 2006, LG Status Report Beam Working Group 4

Part of diaphragm

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 8

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 13

Laser +attenuator assemblyAlfredo Placci

6 April 2006, LG Status Report Beam Working Group 14

R2248 10x10mm2 Specs

Alfredo Placci

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 16

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

6 April 2006, LG Status Report Beam Working Group 30

Niels

6 April 2006, LG Status Report Beam Working Group 31

Niels

6 April 2006, LG Status Report Beam Working Group 32

Niels

6 April 2006, LG Status Report Beam Working Group 33

Niels