Transcript
FTOF – CABLE RUNS Joe Guerra
Terms/Defini=on FTOF – Forward Time of Flight PCAL – Pre-‐shower Calorimeter PMT – Photo Mul=plier tube Panel 1A – Exis=ng panel to be carried over from CLAS6. • Panel 1B – New Panel comprised of 62 scin=llators and 124 PMT’s. Sits +Z, directly in front of panel 1A. • Panel 2 – New panel consis=ng of reused scin=llators and PMT’s from the current panel 2 in CLAS6. Is comprised of 5 scin=llators and 10 PMT’s. • • • •
Purpose • This is to serve as a design document on the FTOF cable rou=ng. • In this document, thought process, idea’s, and cri=cism’s can be detailed on the rou=ng of the FTOF cabling.
Design Considera=ons • How to bundle and strain-‐relief the signal and HV cables along the sector frames for panel -‐1a and panel-‐1b? • Will all cables be the same length? • How to strain relief the panel-‐1A cables and the PMT so that they do not put torques on the dividers? • How to strain-‐relief the panel-‐1b cables at the PMT so that the connectors on the pig-‐tails are not stressed? • How to strain-‐relief the cables at HV patch panels so that we have access for disconnects and so there are no stresses on the cables or connectors?
Design Considera=ons • Will the cable runs go behind the frame beams or on the sides of the frames? • Do we need to add addi=onal places for strain-‐ relief on either the panel-‐1a or panel-‐1b frames? How do we keep the cable bundles in posi=on? • We will need to make sure that we can get to the disconnect points of the panel-‐1b pigtails for servicing. • We need to be able to read the cable labels at the PMT end and the patch panel end.
Design Criteria • There are 62 PMT’s per each side of panel 1B. • There are 23 PMT’s per each side of Panel 1A. • There are two signal and one HV cables per PMT. • HV Cables – 6mm diameter each • Signal Cables – 5mm diameter each
POINT OF VIEW
AVAILABLE AREA’S
Area’s Available • Between LTCC and Panel 1B – 4.480in²*
• Between Panel 1B and 1A – 6.448in²
• Between Adjoining Panel 1B’s – 4.308in²
• Between Panel 1A and PCAL – 13.785in² *NOTE: LTCC measurement not confirmed.
SPACE REQUIRED: • PANEL 1A – Signal: 23 PMT’s * 2cables/PMT’s * 5mm * 5mm = 1150mm² = 1.783in²*** HV: 23 PMT’s * 1cable/PMT *6mm*6mm = 828mm² = 1.283 in²***
• PANEL 1B –
Signal: 62 PMT’s * 2cables/PMT’s * 5mm * 5mm = 3100mm² = 4.805in²*** HV: 62 PMT’s *1cable/PMT’s *6mm *6mm = 2232mm² = 3.460in²***
Panel 1B – HV Cables Available:4.480in² Used: 3.460in²
NOT USED
Panel 1B – Signal Cables Available:6.448in² Used: 4.805in²
Panel 1A – Cables Available:13.785in² Used:3.066in²
AVAILABLE AREA’S
1B Running Scheme • Run HV and Signal Wires Together • Fill Boiom Brackets, then switch to upper brackets TO APEX
Cable Aiachments/Relief Panel 1B-‐ Top Bracket
*NOTE-‐ Design subject to change
Cable Aiachments/Relief Panel 1B-‐ Top (HV CABLES) Fabricated Bracket
McMaster Carr PN: 7572K13 **NOTE: Brackets may be installed opposite of each other on opposite side of panel. This will be done for adjoining sector clearance.
Cable Aiachments/Relief Panel 1B – Boiom Bracket
*NOTE-‐ Design subject to change
Cable Aiachments/Relief Panel 1B – Boiom (SIGNAL CABLES)
NOTE: DYNODE TRANSFORMER TO BE INSTALLED ON ELECTRONICS RACK
Cable Rou=ng -‐Panel 1A -‐ • Follows current rou=ng plan
HV and Signal Patch Panels
FOR STRAIN RELIEF
Cable Runs
Cable Runs (Sector2) (Cont)
Cable Runs (Cont)
Panel 2 Cables
Cable Runs (Cont)
Patch Panel Access
PCAL Clearance (Top View of Sector 4)
Aug. 9, 2012
FTOF Panel-‐1a/2 HV Cable Connec=ons Cable RG-‐59
PMT SHV F
HV Patch SHV M
SHV M SHV F
FTOF Panel-‐1a/2 Signal Cable Connec=ons
Cable RG-‐58
frame-‐mounted PMT BNC M Anode & BNC F BNC M Dynode
Cable RG-‐58 patch cable
BNC F BNC F bulkhead type bulkhead type
Cable RG-‐174 electronics
BNC M Lemo M
Aug. 9, 2012
FTOF Panel-‐1b HV Cable Connec=ons Cable RG-‐59
PMT SHV F
HV Patch SHV M
SHV M SHV F
FTOF Panel-‐1b Signal Cable Connec=ons Cable RG-‐58
Cable RG-‐58
PMT BNC M BNC F BNC M Anode
Cable RG-‐58 frame-‐mounted
PMT BNC M BNC F BNC M Dynode
Cable RG-‐174
patch cable
frame-‐mounted
electronics
BNC F BNC F bulkhead type bulkhead type
Cable RG-‐58 patch cable
BNC F BNC M bulkhead type
460 IT
BNC M Lemo M
Cable RG-‐174 electronics
BNC M Lemo M BNC F BNC F bulkhead type
Answering Ques=ons: • Q: How to bundle and strain-‐relief the signal and HV cables along the sector frames for panel -‐1a and
panel-‐1b?
• A:By using brackets, they cables will be routed either above and or below the prospec=ve panel. • Q:Will all cables be the same length? • A: No. This would leave large lengths of cables of cables that would need to be handled/stored.
Answering Ques=ons: (cont.) • Q:How to strain relief the panel-‐1A cables and the PMT so that they do not put torques on the dividers? • A: By running the cables in the same fashion that they are currently. Also, by securing them via zip =es to the panel 1A scin=llator brackets. • Q: How to strain-‐relief the panel-‐1b cables at the PMT so that the connectors on the pig-‐tails are not stressed? • A: By using wire reliefs secured to the panel 1B backing structures.
Answering Ques=ons: (cont.) • Q:How to strain-‐relief the cables at HV patch panels so that we have access for disconnects and so there are no stresses on the cables or connectors? • A: Aiach the cables to the perforated tube steel that aiaches to the Panel 2 Support frame • Q: Will the cable runs go behind the frame beams or on the sides of the frames? • A: Behind and in front of.
Answering Ques=ons: (cont.) • Q: Do we need to add addi=onal places for strain-‐relief on either the panel-‐1a or panel-‐1b frames? How do we keep the cable bundles in posi=on? • A: Yes, we will add the holes onto 1B that are required for the boiom strain relief. We will use simple drilled holes and self tapping screws for aiachment. The bundles will be held in posi=on by fric=on due to the pressure from securing. • Q: We will need to make sure that we can get to the disconnect points of the panel-‐1b pigtails for servicing. • A: The pig tails will remain in front of the panel. Aqer they are strain relieved and secured to the cable, they will then travel on the underside
Answering Ques=ons: (cont.) • Q: We need to be able to read the cable labels at the PMT end and the patch panel end. • A: This will be done prior to installa=on via a s=cker marking system.
