g5 beam instrumentation d. gassner, e. pozdeyev 4-09
TRANSCRIPT
Instrumentation GoalsMeasure
IntensityCurrent TransformerBPM’s Faraday Cups
ProfilesYAG & OTR screen PM’s
PositionBPM’s Profile Monitors
EmittancePepper pot, slits & PM’s
Beam HaloHalo scrapers
LossesPMT BLM, Ion Chamber’s, & pin diodes
Vacuum Chamber TemperatureIR Camera
G5 Instrumentation Quantities & Layout
Current Transformer 1Halo Scraper (1H & 1V) 2Pepper Pot 1Faraday Cups 2BPM’s 4Profile Monitors 5
BPM
BPM BPM BPM
Profile Monitors (YAG & Tgt)
Profile Monitors YAG & OTR
Pepper PotPorts
Halo Scrapers
CT
Faraday Cups/Beam Stops (TBD)
Gun
5-Cell Cavity
Profile Monitor YAG & Slit
Limited to vacuum related components
In-Flange Current Transformer
Bergoz ICT-CF6-60.4
Integrating type CT Fast bunchesIHR electronicsNoise <1pC beam charge
60.4mm ID40mm axial lengthRad-Hard optionBakeable to 180C, plan 48h at 150C Separate bake-out zone Internal TC, type-E
Beam Position Monitors
- Dual plane- 4 locations (3 at 2MeV, 1 at 20MeV)- BPM Button Pick-ups – Proven Design 10mm diameter SMA Connector 1- 4pF, 5% matching 200C bake-out
Signal Processing Libera BrillianceBNL Design
Profile MonitorsRadiabeam Technologies Optional PM Positions
YAG:Ce Screens: 100u thick, 10’s of pC at 2.5MeV, and ~1 pC at 20MeVOTR foils: Silicon wafer, 20MeV, & > ~130pCEmittance Slit: 50u slit on 2mm thick Tungsten plateResolution target: Adjust focus to 50u resolutionImpedance Match Cage Vacuum conductance slits
6” Cube
PM Actuator Cooling OptionCopper tubing welded around the actuator nipples to protect the actuator during the bake out, keep below 100C.
3 positionpneumatic actuator
Optics Box
Profile Monitor Optics Box
CCD CameraFull Remote Control InterfaceImage analysis & logging
Remote Control LensTriple motorZoom, focus, iris
Two mirrors for Alignment purposes CCD axis shifted upstream from the diagnostics to minimize X-ray exposure
Virtual target (20MeV locations)Resolution 50u
Illumination lamp
Halo Scrapers, Pepper Pot, & Faraday Cup
- All 3 systems are still being designed- Vacuum ports/crosses available- Princeton Scientific possible vendor
Halo Scrapers Measure beam halo distribution Collect charge from intercepted beam halo Two sets of isolated jaws, H & V. Keithley electrometer read out. Stepper motor control & position readback.
Pepper Pot Two sets of remote control plunging slits (mask) Resulting image processed on downstream 2MeV PM viewer
Faraday Cups/Beam Stop (more details at 4:30 talk today) Located at the end of each transport Ceramic break Isolated beam stop
Loss Monitors & IR camera
Non-vacuum chamber related
Beam Loss Monitors (2 each)Machine Protection
Primary Detector
- Bare PMT’s (JLAB-CEBAF) (Hamamatsu 931B)
– Fast (<10us)
– 50dB DR (5nA – 100uA from tube), calibrate signal versus beam charge loss.
– Limited coverage
– Ion chambers (long cables), (ELBE, etc..)
– Full coverage
– Calibration (R/hr)
– less sensitive, useful at areas where we expect high levels
– Pin Diodes (MIP sensitive, small area coverage, rate limited to ~10MHz.
IR Camera Check for beam pipe heating, moveable, variable locations.Remote image display & storage.