Craig Drennan

Linac and 400 MeV BPMs

January 7, 2011

21/6/2011 Linac and 400 MeV BPMs

Linac

31/6/2011 Linac and 400 MeV BPMs

400 MeV and Dump Lines

41/6/2011 Linac and 400 MeV BPMs

400 MeV Line

51/6/2011 Linac and 400 MeV BPMs

Booster Injection

Linac and 400 MeV BPMs 6

Linac Beam Position Monitors

1/6/2011

-Beam position calibration needs improvement.

-There is no online calibration for the current Linac BPM RF Modules.

-It is important that the new BPM electronics be linear with beam intensity in order for steering programs to work properly.

-Desired position resolution of +/- 0.25mm

-NTF ‘s calibration needs should be considered in any upgrade.

Linac and 400 MeV BPMs 7

Linac and 400 MeV BPM Specifications

1/6/2011

Parameter Minimum Typical Maximum

Beam Intensity Range 5 mA 34 mA +/- 1 mA 60 mA

Beam Pulse Duration 2 usec 25 usec 60 usec

BPM Signal Frequency (Note 1) 402.48 MHz

BPM Signal Amplitude Range

Position Measurement Range +/- 25 mm

Position Rise Time (within 2%) 200 nsec

Position Modulation BW 3 MHz

Sample Rate 10 MHz

Position Resolution (Note 2) 0.25 mm

Position Accuracy (Note 3)

Long Term Position Stability 0.25 mm

Beam Phase w.r.t. RF Resolution 0.1 deg

Beam Phase Modulation BW

Linac and 400 MeV BPMs 8

Linac and 400 MeV BPM Data Acquisition* Initial Proposal *

1/6/2011

1. Data acquisition of the beam position and intensity begins after an operator adjustable delay from the selected TCLK event.

2. One intensity and two positions (horizontal and vertical) are reported for each BPM at a 15 Hz rate.

3. Intensities and positions are averages of a settable number of samples over the beam pulse.

4. A settable offset, given as a number of samples into the data, determines which samples are not used in the averages.

Linac and 400 MeV BPMs 9

Linac and 400 MeV BPM Data Acquisition (cont.)

1/6/2011

5. Delivery of every position sample for two operator selected BPM positions could be delivered at a 15 Hz rate. (600 samples = 10E6 sample/sec * 60E-6 sec)

6. One beam pulse average phase measurement from each BPM location delivered at 15 Hz.

7. Delivery of every phase sample for two operator selected BPM locations could be delivered at a 15 Hz rate.

Linac and 400 MeV BPMs 10

Specific 400 MeV BPM Data Acquisition Requirements

1/6/2011

8. First Sample synchronous to the 400 MeV Chopper.

A detailed document for the Chopper / BPM timing is provided in Beams-doc-3696-v1 in the Accelerator Division docDB document database.-----------A detailed document capturing the requirement details is in the works. Contributions to this document are appreciated. -----------Let me know the details you want to see written down and agreed on.

111/6/2011 Linac and 400 MeV BPMs

The End

Linac-Booster Beam Diagnostics 12

Linac Beam Position MonitorsRF Module: Linac Low Energy, Dwg # EE-60820, R.C. Webber 1987

Linac High Energy, Dwg # ED-281074, J. Arthur 1993

Digitizer and DAQ: 20 MHz Digitizers tied into Linac front-end VME crates

12/7/2010

Daily

Linac-Booster Beam Diagnostics 13

Linac Beam Position Monitors• Linac BPM Electronics Upgrade.– Linac BPM positions• Low Energy Linac, 14• High Energy Linac, 80 (19 not currently connected)• 400MeV plus 200 MHz Booster Injection, 51

12/7/2010

– New electronics are like MTA BPMs.

– Prototype installation expected in Spring 2011.

Linac-Booster Beam Diagnostics 14

400MeV Beam Position MonitorsRF Module: Dwg # ED-281074, J. Arthur 1993

Digitizer and DAQ: Omnibyte, 5 MHz, “Comet” VME Beams-doc-3013-v2, S. Lackey 2008For Description of gating see Beams-doc-3696-v1, C.C. Drennan 2010

12/8/2010

400 MeV BPM electronics will be upgraded with the Linac BPM’s.

Daily