NA49 Beam Line 1995
Targets, counters, and other material in the H2 beam line
H. Stroebele
8 Dec 1995
C2: Collimator 2 -412000 mm
C3: Collimator 3 -412000 mm
C6: Collimator 6 -341000 mm
C9: Collimator 9 -147000 mm
S1: 50mmx30mmx0.2mm Quartz (in vac) opt. for TOF -39772 mm
T0: 25mmx25mmx0.5mm Quartz (in vac) TOF and DAQ -39507 mm
BPD1: Si strip Beam Position Detector (in vac) -39113 mm
MBPL: Bending Magnet for beam cal. alignm.(in vac) -36907 mm
BPD2: Si strip Beam Position Detector (in vac) -16426 mm
S2: 20mmx20mmx5mm Scint.(in vac) not used for Pb -15691 mm
V0: 80 mm diameter with 10 mm hole Scint. (in vac) -15441 mm
FISC: thin scint. wire hor. and vert. -14746 mm
Window: vacuum 0.05 mm black Mylar - 6660 mm
V1: large scint. covered with lead with 40 mm hole - 6630 mm
BPD3: Si strip Beam Position Detector (not used) - 6514 mm
Target0: 0.5 mm Ta for multi-target runs on BPD3 stage - 6434 mm
Window: Target He-bag, 0.02 mm Mylar - 6400 mm
Target1: 204 mg/cm**2 Pb (main production target) - 5801 mm
Window: Target He-bag, 0.02 mm Mylar - 5792 mm
VM1: Vertex 1 Magnet and VTPC1, nominal position - 3802 mm
BPD4: Si strip Beam Position Detector (not used) - 1895 mm
Target2: 0.5 mm Ta for multi-target runs on BPD4 stage - 1815 mm
VM2: Vertex 2 Magnet and VTPC2, nominal position 0 mm
Target3: 0.5 mm Ta for multi-target runs (pivoting arm) 1571 mm
Window: SAC He-bag; 15 micron Al + 85 micron Mylar 1575 mm
Window: SAC He-bag; 15 micron Al + 85 micron Mylar 3325 mm
Window: MTPC He-bag; 100 micron Mylar 3325 mm
Target4: 379 mg/cm**2 Pb for K0s in MTPC 3340 mm
Window: MTPC He-bag; 100 micron Mylar 8525 mm
S4: Veto counter 20mmx20mmx1mm Quartz 9400 mm
Ring: Calorimeter front face 13800 mm
S5: fragment counter 60mmx40mmx10mm Quartz 19150 mm
Coll: Collimator front face 19200 mm
Veto: Calorimeter front face 21800 mm
Send corrections or additions to Art Poskanzer
C2: Collimator 2 -412000 mm
Hozizonal collimator for the horizontal divergence. Stardard setting is about +/-1.5 mm
Adjust the beam intensity by moving the colimators. Collimators 2, 3, and 6 should be approximately the same. If you are closing the collimator, it first opens all the way, so first put the plug (TAX) in to -100 mm. To do so on the EANORTH terminal type RUN TREE, go to TUNE, SPECIAL, TAX, 1, and set to -100. If you are opening the collimator this is not necessary. To move the collimator itself chose TUNE, SET, COLLIMATORS, 2, and type in desired value.
C3: Collimator 3 -412000 mm
Selects central momentum bite. Stardard setting is about +/-1.5 mm
Adjust the beam intensity by moving the colimators. Collimators 2, 3, and 6 should be approximately the same. If you are closing the collimator, it first opens all the way, so first put the plug (TAX) in to -100 mm. To do so on the EANORTH terminal type RUN TREE, go to TUNE, SPECIAL, TAX, 1, and set to -100. If you are opening the collimator this is not necessary. To move the collimator itself chose TUNE, SET, COLLIMATORS, 3, and type in desired value.
C6: Collimator 6 -341000 mm
Verticle collimator for verticle size. Stardard setting is about +/-1.5 mm
Adjust the beam intensity by moving the colimators. Collimators 2, 3, and 6 should be approximately the same. If you are closing the collimator, it first opens all the way, so first put the plug (TAX) in to -100 mm. To do so on the EANORTH terminal type RUN TREE, go to TUNE, SPECIAL, TAX, 1, and set to -100. If you are opening the collimator this is not necessary. To move the collimator itself chose TUNE, SET, COLLIMATORS, 6, and type in desired value.
C9: Collimator 9 -147000 mm
Cleaning collimator. Be sure not to scrape the beam. Stardard setting is about +/-5 mm
On the EANORTH terminal type RUN TREE. To move the collimator chose TUNE, SET, COLLIMATORS, 9, and type in desired value.
S1: 50 mm x 30 mm x 0.2 mm Quartz (in vac) opt. for TOF -39772 mm
This counter is mounted on a vertical stage, which can be controlled
from inside the counting house in Rack 17.
- The present (8 Nov 95) in-beam position is 70.0
- The present (1 Nov 95) out-of-beam position is 4.0
- The present (8 Nov 95) HV setting (Rack 19) is 1600 V
If not needed by TOF this counter should be in the out-position,
because it will produce unwanted fragments.
For the above 3 values also check the logbook!
The HV has to bet set to zero before the vacuum in the beam pipe
is either broken or reestablished!
Responsible for this Detector: Marburg group
T0: 25 mm x 25 mm x 0.5 mm Quartz (in vac) TOF and DAQ -39597 mm
This counter is used as the positive beam defining counter
for ions and, in addition, as time=0 for TOF.
This counter is mounted on a vertical stage, which can be controlled
from inside the counting house in Rack 17.
- The present (8 Nov 95) in-beam position is 115
- The present (1 Nov 95) out-of-beam position is 5.0
- The present (1 Nov 95) HV setting (Rack 19) is 1650 V
For the above 3 values also check the logbook!
The HV has to bet set to zero before the vacuum in the beam pipe
is either broken or reestablished!
Responsible for this Detector: Marburg group
BPD1: Si strip Beam Position Detector (in vac) -39113 mm
This detector measures the beam position in x- and y- directions
perpendicular to the beam with twice 192 Si strips. Each strip
is 200 microns wide.
The nominal x- and y-coordinates of its center are
- X-center = -0.3 mm
- Y-center = -1.49 mm
Remove bias voltage before changing the pressure in the beam pipe!
Responsible for this detector: P. Freund, MPI Muenchen
MBPL: Bending Magnet for beam cal. alignm. (in vac) -36907 mm
This bending magnet (2 m long) can be used to deflect the beam for
TPC alignment measurements. It is controlled by
the beam control console (TREE: magnet name is Bend8).
Its maximum bending power for a 400 GeV/c particle
(corresponding to 160 GeV/c Pb beam) is appr. 10 cm at VTPC1.
Either spectator protons or secondary hadrons have to be used.
BPD2: Si strip Beam Position Detector (in vac) -16426 mm
This detector measures the beam position in x- and y- directions
perpendicular to the beam with twice 192 Si strips. Each strip
is 200 microns wide.
The nominal x- and y-coordinates of its center are
- X-center = 2.83 mm
- Y-center = -1.95 mm
Remove bias voltage before changing the pressure in the beam pipe!
Responsible for this detector: P. Freund, MPI Muenchen
S2: 20 mm x 20 mm x 5 mm Scint. (in vac) not used for Pb -15691 mm
This counter is not used for normal Pb running; however,
it can be used to tune the beam.
This counter is mounted on a vertical stage, which can be controlled
from inside the counting house in Rack 17.
- The present (1 Nov 95) in-beam position is 63.1
- The present (1 Nov 95) out-of-beam position is 4.0
- The present (1 Nov 95) HV setting is 1750 V
For the above 3 values also check the logbook!
The HV has to bet set to zero before the vacuum in the beam pipe
is either broken or reestablished!
Responsible for this Detector: D. Vranic, CERN
V0: 80 mm diameter with 10 mm hole Scint. (in vac) -15441 mm
This counter is essential for the clean-up of the beam;
it vetoes charged particles and fragments which are produced upstream.
This counter is mounted on a vertical stage, which can be controlled
from inside the counting house in Rack 17.
- The present (8 Nov 95) in-beam position is 73.8
- The present (1 Nov 95) out-of-beam position is 4.0
- The present (8 Nov 95) HV setting (Rack 19) is 1350 V
For the above 3 values also check the logbook!
The HV has to bet set to zero before the vacuum in the beam pipe
is either broken or reestablished!
Responsible for this Detector: D. Vranic, CERN
FISC: thin scint. wire hor. and vert. -14746 mm
This detector, FISC 11/12, belongs to the external beams group (N. Doble)
and is controled by the TREE program.
It consists of two perpendicular thin wires which are read
out by two PM tubes each. The wires are movable under
beam console control.
The detector is used to scan the profile of the beam in
the plane perpendicular to the beam.
Also, the wires can be positioned in the center and scanned
with TRIM5 and TRIM6 to fine tune the beam position.
Normally the FISC is aligned such that the reading 0.0 gives
the center of the nominal beam. At present (27 Nov 95) X = -4 mm and Y = 0 mm.
Responsible for this detector is the external beam group.
Window: vacuum 0.05 mm black Mylar - 6660 mm
V1: large scint. covered with lead with 40 mm hole - 6630 mm
This large area counter provides additional clean-up of the beam;
it vetoes charged particles and fragments which are produced upstream.
It is mounted in the gap between the vacuum pipe and Target0.
For beam calibration operation it has to be removed.
- The present (19 Nov 95) HV setting (Rack 19 middle row) is 2165 V
Responsible for this Detector: D. Vranic, CERN
BPD3: Si strip Beam Position Detector (not used) - 6514 mm
This detector measures the beam position in x- and y- directions
perpendicular to the beam with twice 48 Si strips. Each strip
is 200 microns wide.
It is mounted on a stage movable horizontally remotely
from the counting house. To operate the stage go to the Laser
Macintosh and open the desktop item GPIB. Then open SMK
Control 2.2. To activate, click on the upper left arrow.
This window allows one to move the stage.
BPD3 is axis "Z". The direction of motion is positive towards
Saleve and negative towards Jura, thus opposite to the standard
NA49 coordinate system definition. Step size is 17 microns.
The stage can also be moved locally by activating one of the limit
switches; the stage will then move away from that switch.
Responsible for this detector: P. Freund, MPI Muenchen and
H. Stroebele Univ. Frankfurt
Target0: 0.5 mm Ta for multi-target runs on BPD3 stage - 6434 mm
This target is mounted on the BPD3 shielding box on the downstream and
Jura side. The box is mounted on a stage which is movable horizontally
remotely from the counting house. To operate the stage
make sure that the control unit ("upstream") in rack 21
lowest row is switched to remote control and then
go to the Laser Macintosh and open the desktop the item
GPIB. Then open SMK
Control 2.2. To activate, click on the upper left arrow.
This window allows one to move the stage.
BPD3 is axis "Z". The direction of motion is positive towards
Saleve and negative towards Jura, thus opposite to the standard
NA49 coordinate system definition. Step size is 17 microns.
Target position in the beam should normally be 00000.
This can be checked at the stage: there are vertical marks
on paper stickers at the upper and lower end of the vertical
L-beam. These define the horizontal position of the stage.
CAUTION: "target in beam position" is very close to V1!!!!!!
Switch back control unit to local for safety reasons.
The stage can also be moved locally by activating one of the limit
switches; the stage will then move away from that switch.
Responsible for this item: H. Stroebele Univ. Frankfurt
Window: He-bag, 0.02 mm Mylar - 6400 mm
To inflate the target He bag open the valve labelled TARGET on the
He distribution line in the gas cave. Adjust the flux to about
7 l/hr. on the scale on the
corresponding flow meter. Make sure that the valve mounted on
the lower left front of VTX1 is open.
The valve next to the He inlet to the He bag just above the
green gate valve on the target mount must be closed.
The exhaust of the He bag is a pigtail inside the magnet compartment.
Target1: 204 mg/cm**2 Pb (main prod. target; in He-Bag) - 5801 mm
The target is mounted on the axis of a pneumatic cylinder
which can be moved up and down remotely from the
counting house. The corresponding buttons and indicators
are mounted in the very top row of rack 15.
The nitrogen supply labelled
"LASER" in the gas cave has to be open for operation. Also,
the pressure reducing valve on top has to be open.
One of the two indicators will be lit, if there is pressure in the
corresponding line to the cylinder. There are additional
valves after the sensors in these lines which have to be
open! They are mounted on the front face of VTX1 at the very lower
left side.
The target is in He atmosphere. It can be changed without
opening the He bag:
- move the target into the "out" position
- close the green gate valve
- open the lower vacuum clamping connection
- remove cylinder with target
- exchange the target (other targets are in Stroebele's
tool box in the cage; key is in the beam console drawer).
- for reinstallation use reverse procedure
Window: He-bag, 0.02 mm Mylar - 5792 mm
VM1: Vertex 1 Magnet and VTPC1, nominal position - 3802 mm
For VTPC1 see elsewhere.
For Magnet operation press the buttons in the following order:
- rearmement
- commande marche
- contacteur CT4 (red LED => green LED)
- set dial 00000
- press "SET" next to dial
- puissance marche
Now set new dial values (choose steps smaller than 500 from what you have)
and press "set" button until you arrive at the nominal setting.
After current becomes stable verify field strength by looking
at the hall probes read-out on slow control (terminal in rack 24):
select E+B field; select hall probes; choose uppermost readings only.
Also check the magnet current reading and compare it the logbook value.
If the field changes by more than 100 Gauss (30 Amps) call an
expert.
In case of trouble with the power supply contact
- Chauchaix 5311 <4373>
- J.-C. Carlier 5476 <3525>
- J. Hudry 5649 <4314>
- C. Valentini 3237 <4092>
In case of trouble with Cryogeny call their control room 6877 or
D. Delikaris 8276 <5025>.
BPD4: Si strip Beam Position Detector (not used) - 1895 mm
This detector measures the beam position in x- and y- directions
perpendicular to the beam with twice 48 Si strips. Each strip
is 200microns wide.
It is mounted on a stage movable horizontally remotely
from the counting house. To operate the stage go to the Laser
Macintosh and open on the desk top item GPIB. Then open SMK
Control 2.2. To activate, click on the upper left arrow.
This window allows one to move the stage.
BPD4 is axis "R". The direction of motion is positive towards
Saleve and negative towards Jura, thus opposite to the standard
NA49 coordinate system definition. Step size is 17 microns.
The stage can also be moved locally by activating one of the limit
switches; the stage will then move away from that switch.
Responsible for this detector are P. Freund, MPI Muenchen and
H. Stroebele Univ. Frankfurt
Target2: 0.5 mm Ta for multi-target runs on BPD4 stage - 1815 mm
This target is mounted on the BPD4 shielding box on the downstream and
Jura side. The box is mounted on a stage movable horizontally
remotely from the counting house. To operate the stage
make sure that the control unit ("downstream") in rack 21
lowest row is switched to remote control. If you do it
remotely make sure that someone is at the target watching the action.
Then go to the Laser Macintosh and open on the desk top item
GPIB. Then open SMK
Control 2.2. To activate, click on the upper left arrow.
This window allows one to move the stage.
BPD4 is axis "R". The direction of motion is positive towards
Saleve and negative towards Jura, thus opposite to the standard
NA49 coordinate system definition. Step size is 17 microns.
Target position in the beam should normally be 00000.
This can be checked at the stage: there are vertical marks
on paper stickers at the upper and lower end of the vertical
L-beam. These define the horizontal position of the stage.
Switch back control unit to local for safety reasons!
The stage can also be moved locally by activating one of the limit
switches; the stage will then move away from that switch.
Responsible for this item: H. Stroebele Univ. Frankfurt
VM2: Vertex 2 Magnet and VTPC2, nominal position 0 mm
For VTPC2 see elsewhere.
For Magnet operation press the buttons in the following order:
- rearmement
- commande marche
- contactor CT4 (red LED => green LED)
- set dial 00000
- press "SET" next to dial
- puissance marche
Now set new dial after currents has nearly stabilised (choose
steps smaller than 500 from what you have)
and press "set" button until you arrive at nominal setting.
After current becomes stable verify field strength by looking
at the hall probes read-out in slow control (terminal in rack 24):
select E+B field; select hall probes; choose uppermost readings only.
Also check the magnet current reading and compare it the logbook value.
If the field changes by more than 100 Gauss (30 Amps) call an
expert.
For technical help see VM1.
Target3: 0.5 mm Ta for multi-target runs (on pivoting arm) 1571 mm
The target is mounted on a pivoting arm
which can be moved up and down remotely from the
counting house. The corresponding buttons and indicators
are mounted in the very top row of rack 15. Always make a
visual inspection of what happened.
The nitrogen supply labelled
"LASER" in the gas cave has to be open for operation. Also,
the pressure reducing valve on top has to be open.
One of the two indicators will be lit, if there is pressure in the
corresponding line to the cylinder. There are additional
valves after the sensors in these lines which have to be
open! They are mounted on the front face of VTX1 at the very lower
left side.
The indicators light up, if the corresponding limit positions
are reached. Thus the target may be in the beam if the
"target out" light is not lit.
Window: SAC He-bag; 15 micron Al + 85 micron Mylar 1575 mm
The beam passes through the normal He bag walls.
The material is foil A30 from NAWROT GmbH, D-51688 Wipperfeld,
Fax 02268 2701.
Window: SAC He-bag; 15 micron Al + 85 micron Mylar 3325 mm
The beam passes through the normal He bag walls.
The material is foil A30 from NAWROT GmbH, D-51688 Wipperfeld,
Fax 02268 2701.
Window: MTPC He-bag; 100 micron Mylar 3325 mm
Target4: 379 mg/cm**2 Pb for K0s in MTPC 3340 mm
This target is hanging from an aluminium plate above the
He bag. It can be pulled out or dropped into the beam
from inside the MTPC hut.
Window: MTPC He-bag; 100 micron Mylar 8525 mm
S4: Veto counter 20 mm x 20 mm x 1 mm Quartz 9400 mm
This counter is mounted on a stage movable in the plane
perpendicular to the beam, which is remotely controlled
from the counting house in Rack 17.
The present (22 Dec 95) nominal positions are
- y = +22.2 mm
- x = +9.2 mm (field-off)
- x = -60.4 mm (-0.60.4 on the display) (STD+)
- x = +76.5 mm ( 0.76.5 on the display) (STD-)
- The HV setting (Rack 19) is 2050 V
- The treshold is set by the TOF people
Always verify in the logbook!
Ring: Calorimeter front face 13800 mm
- STD- is 20 cm towards Saleve
S5: fragment counter 60 mm x 40 mm x 10 mm Quartz 19150 mm
Coll: Collimator front face 19200 mm
The verticle opening is +/-50 mm. In the STD+ configuration the horizontal opening
goes from -50 mm to +380 mm.
Veto: Calorimeter front face 21800 mm
- STD- is 10 cm towards Saleve
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