Privacy and Security Notice
Q<sub>weak</sub> KEEP OUT Zones as of 20-jul-2007
Qweak KEEP OUT Zones as of 20-jul-2007
NOTE: the Z direction is along the beamline with the origin
being at the center of the QTOR magnet
Hall C info:
- Beam height = 395.6 cm +/- 0.2 cm above floor
According to email from J. Dalberg 16-mar-04, ie prior to Hashimoto Highway
- Rails are 10.5" above floor
In the following, assume detectors are in the 12 o'clock position
Target:
- Thickness = 35 cm, centered at Z = -650.000 cm
upstream edge at Z = -667.500 cm, downstream edge at Z = -632.500 cm
- Radius = 2.54 cm
- How much KEEP OUT space is needed
upstream and downstream of the 35 cm target?
- How much KEEP OUT space is needed
in the radial direction away from the target?
Space currently between the Target and the Upstream Collimator = 49.090 cm
Upstream Cleanup Collimator:
- Thickness = 15.24 cm, centered at Z = -575.790 cm
upstream edge at Z = -583.410 cm, downstream edge at Z = -568.170 cm
- Upstream gap: r = 5 to 16.34 cm
Downstream gap: r = 6.2 to 19.3 cm
- IF THIS NEEDS TO MOVE OR GET THICKER, THE DOWNSTREAM EDGE MUST
NOT MOVE ANY FURTHER DOWNSTREAM OR IT WILL ENTER THE REGION I SPACE.
Region I:
KEEPOUT Space between Upstream Collimator and GEMS = 10.000 cm
- Length in Z = 30 cm, centered at Z = -543.170 cm
upstream edge at Z = -558.170 cm, downstream edge at Z = -528.170 cm
- How much KEEP OUT space is needed
downstream of the 30 cm reserved for the GEMs?
- Must be far enough away from the Minitorus so that the magnetic
field at the GEMs is less than 5 G
- Length in horizontal direction = how much larger than active area?
- Length in vertical direction = how much larger than active area?
-
KEEPOUT Space in radial direction = 182.9 cm to be able to service GEMs
Space currently between GEMS and the Primary Collimator = 142.451 cm
Primary Collimator:
- Length in Z = 14.00 (21.6458) cm, centered at Z = -378.719 (374.896) cm
upstream edge at Z = -385.719, downstream edge at Z = -371.719 (-364.0732)
- Upstream gap: r = 31.4 to 57 cm
Downstream gap: r = 331.1 to 62 cm
KEEPOUT Space between Primary collimator and Region II = 12.6458 (5.000) cm
Region II:
- Length in Z = 17.2 cm, centered at Z = -350.4732 for upstream
wirechambers
upstream edge at Z = -359.0732, downstream edge at Z = -341.8732
- How much KEEP OUT space is needed
downstream of the upstream wirechambers?
-
Space currently between the upstream and downstream wirechambers
= 35.1142 cm
- How much KEEP OUT space is needed
upstream of the downstream wirechambers?
- Length in Z = 17.2 cm, centered at Z = -298.159 for downstream
wirechambers
upstream edge at Z = -306.759, downstream edge at Z = -289.559
- Length in horizontal direction = how much larger than active area?
- Length in vertical direction = how much larger than active area?
KEEPOUT Space between Region II and Downstream Cleanup Collimator
= 5.000 cm
Downstream Cleanup Collimator:
- Length in Z = 15.24 cm, centered at Z = -276.939 cm
upstream edge at Z = -284.559 cm , downstream edge at -269.319 cm
KEEPOUT Space between the Downstream Cleanup Collimator and
QTOR support = 17.70 cm
QTOR and supports:
- Length in Z = 503.238 cm, centered at Z = 0.000 cm
upstream edge at Z = -251.619 cm, downstream edge at Z = +257.21 cm
- Upstream QTOR support Z = -251.619 cm to -198.921 cm
- QTOR Z = -185 cm to 185 cm
- Downstream QTOR support Z = 200 cm to 257.21 cm
KEEPOUT Space between QTOR support and shielding hut = 55.000 cm
Sheilding hut:
- Length in Z = 70.00 cm, centered at Z = 347.21 cm
upstream edge at Z = 312.21 cm, downstream edge at Z = 382.21 cm
Region III:
- DC: Length in horizontal direction = how much larger than active area?
- DC: Length in vertical direction = how much larger than active area?
- DC: Length in Z depends on vertical length and tilt angle = ?
- How much KEEP OUT space is needed
upstream and downstream of the Region III chambers?
- Scint: Length in horizontal direction = 2 X 25 cm larger than active area
- Scint: Length in vertical direction = 35 cm larger than active area,
toward beamline
- Scint: Length in Z = 1 cm + 3" PMT + support frame ~ 10 cm
- How much KEEP OUT space is needed
upstream and downstream of the scintillator?
Cerenkov:
- Cerenkov: Length in horizontal direction = 200 cm + Lightguide?
- Cerenkov: Length in vertical direction = 18 cm
- Cerenkov: Length in Z = 1.25 cm + lightguide + 5" PMT +
support frame = ?
Centered at Z = 570 cm
-
CURRENTLY 70.1 cm between the bottom of the lowest Cerenkov bar
and the floor
-
KEEPOUT Space upstream of Cerenkov = 10 cm
KEEPOUT Space downstream of Cerenkov = 200 cm
--> KEEPOUT Space for Cerenkov Z= 560 to 770 cm
Allena Opper
Last modified: Friday, 20-jul-07