Download - MEG DC (report June 04)
MEG DC (report June 04)
DC report june_04,J.E.
a) Foil stability and quench related problems
b) How to get more stability
c) Frame design
d) Measurement of the target position
e) schedule 2004-2005
DC
gas
Bag
gas
Sbag2
Sbag1
Vbubbler bubbler
pbagpDC
XR
XL
YO
XL,XRYO ,XR +XL
Pbag ,PDC Pbag -PDC
Hood foil stability test a) .1 mm not reached at flux changes
b) V-bubbler successful
c) XR,XL,YO correlated
Larger forces on the foil
„vertical forces“, stabilize chamber width
DC report june_04,J.E.
a) Larger forces on the frame larger deformations
b) How to get „vertical forces“
Control of the HV to avoid damages during quench
a) Quench is relatively slow : > > 1 sec
b) To fast switch off (chamber HV) is also dangerous : RC(chamber) ~ 10 s
)c switch off time ~ 100 s
We think about ways to test the behavior to quenches, as soon as the Al-frame full size prototype will be completely available
DC report june_04,J.E.
Mounting of Cathode foils
c) Cut foil vertical miniforce on the foil Also z-stability better (^ expansion coef
b) Position (.1 mm) stretched foils and glue them on frame and ROHACELL
DC report june_04,J.E.
a) Stretched carbon fibers(1000x d=6m) and deformed ROHACELL
Pretension forces on frame to simulate carbon fibers and foils, glue fibers
Mounting of Hood foil
Largest height
Not disturbing the cell
To do better: Stretch „vertically“ and fix the width
a) Modify the shape of the hood to have a larger flat surface to glue
b) Machine a foam structure in ROHACELL 30
c) Adapt the cathode foil procedureOnly minor modifications to the previously designed tools
DC report june_04,J.E.
Stesalit
11
0 m
m
199 mm 331 mm
basis
wings
Carbon fibers
Frame shapea) fix dimensions of foils order
b) Only wing print + built in LV supply cable
c) carbon fibers solution () and price
d) modify frame shape to correct in first order for:
basis shape ( first cell) frame height (foil height) edge angle (gluing)
tested
DC report june_04,J.E.
target position
a) Without knowing the exact spectrometer resolutionbuild a target with holes of different sizes
b) Knowing the exact spectrometer resolution optimize the size of a series of holes and slits on the target to clearly see the holes without loosing too much intensitiesSince the non stopped seem to have a larger probability to contribute to the background, the edge of the target will not be sharp enough .
DC report june_04,J.E.
2002 2003 2004 2005
Test MilestoneAssemblyDesign Manufacturing
Full Prototype
Medium PrototypeCharge division & Cosmics
Full Detector (18 DC)
Drift Chamber
Full Prototype Beam test
Full Prototype
Charge division & Cosmics
Medium Prototype
Full Detector (18 DC)
outside insideCOBRA
Inside COBRA
Full Size Prototype
Mod tools
2004 2005
Test MilestoneAssemblyDesign Manufacturing
Drift Chamber
outside insideCOBRA
Inside COBRA
Feb Mar Apr Mai Jun jul Aug Sep Oct Nov Dec Jan Feb Mar Apr Mai Jun Jul Aug
Order Delivery
Foil
frames
tests
1 29 30
30
1
Other Prints 1
Print anode 1
Simul,design
Preamp cable
Full Size Prototype,Al
Tests anode
Full prototype
Full Detector (18 DC)
Beam,quench
support
Inside COBRA
calibration
DC report june_04,J.E.
cosmics
beam
2004J F M A M J J A S O N D
Beam Time MEG
Pra
c MEG Gotta
COBRACalibration
(Wed)
Beam
Line
Commiss.
Part 1
Pla
tf.
Drift
Chamber
Proto
type
Timing Counter TestMechan.
Matching
LPTNeutr.
BGPM + Src Inst
Pi- Beam
Test
Liq.
Purif.
Full Calorimeter
Trigger
DAQ
Te
st
2005 2006J F M A M J J A S O N D J F M A
Beam Time Shutdown MEG Gotta? MEG Shutdown
COBRAField
MapBeam
Line
BTS
Test
Commiss.
Part 2
Full Beam
Line Test
Drift
ChamberMounting
Mounting &
Testing
Timing
Counter
BG
Test
BG
TestInst
LPT PMT testing + calibration
Full
Calorimeter
Cryo.
Installation
Crane+
TentAssembly
Studies
(Wed + remote)Test
Trigger
Inst Inst
DAQDC
Electr.
Inst Inst