g2p/GEp Beamline

g2p/GEp Beamline

Tim MichalskiProject Lead

Beamline Overview

Slow Raster

Tungsten Calorimeter

Upside Down Girder(correctors, BCM, superharp)

FZ1 MagnetFZ2 Magnet

Viewer

Diagnostics Girder (BPMs, Harp)

IIC1D07IIC1D0ADUMP

ION CHAMBERS

Slow Raster• Technical

– Signal generator control from Counting House

– Up to 25mm diameter raster pattern – uniform energy distribution across target face

• Safety– OSP modified from Hall C use– Masked for beam setup in straight

thru configuration with Tune beam

• Status– Verified during commissioning run– Ready for physics

Tungsten Calorimeter• Technical

– Repositioned from Long Girder in Hall A

– Controller redesigned and rebuilt w/PC104, new control SW

– Calibration demonstrates 1% accuracy in beam current measurement

• Safety– No change from historical Hall A

operation

• Status– Verified during commissioning run– Ready for physics

BCM w/ new 2-Channel Receiver• Technical

– New 2 channel receiver electronics design – tailored for low current measurement

– Standard BCMs• Safety

– No change from historical Hall A operation• Status

– Verified during commissioning run– Ready for physics

BPM w/ new 4-Channel Receiver• Technical

– New 4 channel receiver electronics design – tailored for low current measurement

– M15 antenna style BPMs

• Safety– No change from historical Hall A operation

• Status– 3 units complete and tested - fully characterized and tested in

electronics lab– 30 Hz and Beam Sync implemented– Finalizing SW by February 9– Requires final installation and testing

BPM w/ new 4-Channel Receiver• Technical

– Required Input Parameters• Dynamic Range - Imin and Imax (50 nA < G2P < 150 nA)• Resolution/Accuracy - Determines SNR (G2P ~ 100 um)

Based on physics and algorithm• Output Rate - Ultimate system BW and output sample rate

(G2P = 2 kHz)• Isolation - Crosstalk and rejection of “systematics”

BPM w/ new 4-Channel Receiver• Signal is Sensor-Specific

100um resolution requires SNR =34 dB. M15 will provide -102 dBm @ 50 nA

0.0001 0.0010 0.0100 0.1000 1.0000 10.0000 100.0000 1000.0000

-200.00

-150.00

-100.00

-50.00

0.00

50.00Nominal Sensor Response vs. Beam Current

M15 (4-Wire)Cavity BCMCavity BPM (1mm offset)

Beam Current, uA

Nom

inal

RF

Out

put,

dBm

BPM w/ new 4-Channel Receiver

• Required Noise Floor = -136 dBm

• Required Noise Fig. (BW=2kHz) = 5 dB

• Actual receiver Noise Figure = 2-3 dB (based on gain setting)

M15 w/ Prototype Electronics, BW ~ 2000 Hz

Superharp• Technical

– 50 um wire– New fork design– New controller chassis – PC104 w/

new SW

• Safety– No change from historical Hall A

operation

• Status– Tested during commissioning run

• Trigger needs to be adjusted• Will test electronics and interface with an

injected signal• Increased wire size and material

– Ready for physics

FZ Magnets and PSs• Technical

– FZ1 – 325 A @ 40VDC (PS) • Requires AI magnet in series to achieve desirable load on PS

– FZ2 – 500 A @ 40VDC (PS)– New vacuum chambers to contain beam path for all energy levels– Draws from hall LCW for cooling (magnets and PSs)

• Safety– OSP approved and in hall– Hardware Interlocks on PS– Klixons on magnets– Beacons – interlocked to PS– Signage

• Status– Full power test status – FZ1 tested complete, FZ2 PS failed component

at 95% (repair and retest)

FZ Magnets and PSs

Chicane

Control box removed when not being used.

Chicane

Viewer Girder

Diagnostics Girder2 BPMs, 1 Superharp

Chicane• Technical

– 2 FZ magnets, viewer, 2 BPMs, superharp– FZ2 magnet on vertically adjustable stand to accommodate all beam

energies– FZ2 repositioning and alignment required at multiple times during

physics run (viewer and diagnostics girder repositioning is also required)• Safety

– OSP is approved and in hall– FZ2 stand controller is removable from the hall– Standard PPE

• Status– Used for straight through operation during commissioning run– Design change in process to improve robustness of diagnostics girder

mount (withstand loads due to vacuum)– No issues expected with final 2B alignment

Safety Systems• Interlocks

– Diffuser – water flow– Calorimeter– Compton Electron

Detector– Radiator– Target Movement– Hydrogen Sniffer– UPS SW Crash– Lumi and Ion Chambers– BLM– Vacuum

– FZ1 and FZ2 Magnets– Septum Magnet– Target Magnet– Fast Raster – H2 Sense– Water Flow– Differential Pressure– Supply Pressure– Supply Temperature

Experimental Run PlanRun # Beam Energy Max Beam Current Target Angle Target Location Septa Magnet Dump Target Material Target field Comments

1.159 1 uA N/A 87 cm upstream N/A Hall A Dump N/A 0 Straight Thru Beam

1 1.159 50-150nA 90 87 cm upstream Yes-6deg Hall A Dump NH3 2.5 T

1a 1.159 50-150 nA 90 87 cm upstream YES Hall A Dump Cal/optics 2.5 T empty tgt or one of the optics tgt

2 1.159 50-150 nA 7 87 cm upstream YES Hall A dump NH3 2.5 T

2a 1.159 50-150 nA 7 87 cm upstream YES Hall A dump Cal/optics 2.5 T empty tgt or one of the optics tgt


3 1.706 50-150 nA 7 87 cm upstream YES Hall A dump NH3 2.5 T


4 1.706 50-150 nA 90 87 cm upstream Yes-6deg Hall A dump NH3 2.5 T



5 2.257 50-150 nA 90 87cm upstream YES Hall A dump NH3 2.5 T

6 2.257 50-150 nA 7 87cm upstream YES Hall A dump NH3 2.5 T


7 2.257 50-130 nA 90 87 cm upstream Yes - 6 deg Local Dump NH3 5.01 T

7a 2.257 50-150 nA 90 87 cm upstream YES Local Dump Cal/optics 5.01 T empty tgt or one of the optics tgt

8 2.257 50-130 nA 7 87 cm upstream Yes- 6 deg Hall A dump NH3 5.01 T


9 3.355 50-130 nA 90 87 cm upstream Yes - 6 deg Local Dump NH3 5.01 T

9a 3.355 150 nA max 90 87 cm upstream Yes - 6 deg Local Dump Cal/optics 5.01 T empty tgt or one of the optics tgt

10 3.355 50-130 nA 7 87 cm upstream Yes - 6 deg Hall A Dump NH3 5.01 T

11 3.355 50-130 nA 0 87 cm upstream Yes - 6 deg Hall A Dump NH3 5.01 T Longitudinal target polarization run

g2p/GEp Beamline

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