ISAC Beam

1
SCB1 Vault Test
Diagnostic box
ISAC-II Vault
SCB1
Level 0 refrigerator room
PS Rack
Buncher
Level 1 power supply room
Helium Dewar
Test Configuration
ISAC Beam
2
Goals

• S-bend commissioning
• First operation of refrigerator by TRIUMF
  personnel
• Test services/cabling performance from final
  location
• Identify cross-talk or environmental problems
• Test rf performance with refrigerator in
  continuous delivery
• accelerate some beam

3
Transfer Beamline

• 26Mg6 at 1.5MeV/u from OLIS RFQ DTL
• 35MHz buncher in beamline for matching to SCB1

Buncher
Straight Section
Vault Section
4
Diagnostic box
ISAC-II Vault
SCB1
Fast Faraday Cup Signal
Buncher
Test Configuration
1ns
ISAC Beam
Buncher on
5
Diagnostic box
ISAC-II Vault
SCB1
Profile Monitor Signal
Si Detector TDC Signal
Buncher
Solenoid on
Buncher on
ISAC Beam
6
ISAC-II Cryogenics
Cold Box
LHe Dewar
Compressor Room
7
Vault Test Plumbing
Cryomodule
LHe Supply (Transfer line)
VJ Flexiline He Exhaust
Vaporizor
He Warm Return
He Fixed Warm Return
LHe Dewar
8
Vault Test - LN2 Plumbing
Cryomodule
LN2 Supply (VJ line)
Vault Supply
VJ Flexiline N2 Exhaust
VJ Flexiline LN2 supply
Gas Meter
LN2 Phase Separator
N2 Fixed Exhaust
LHe Dewar
Continuously feed 4-5 ltr/hr LN2 to cool thermal
shield.
9
Helium Flow Schematic
Level SCB1HELVL2A
Vaporizer
To/From Compressor
SCB1 Cryomodule
Heater SCB1HTR32
LHe Dewar
Linde Coldbox
Heater SRSHEHTR
Level SRSHELVL1
10
Refrigerator Operation

• Refrigerator operated in 24 hour continuous mode
  after an initial startup period.
• ISAC-OPS monitors operation
• LHe level in cryomodule and supply dewar
  regulated manually by heaters in each volume

SCB1 Level
Dewar Level
11
Medium Beta Cryomodule

• SCB3 cold tests completed successfully
• SCB1 assembled and cold tested
• Goal Five modules completed by Dec. 2005

12
RF Operation

• Three cavities locked at ISAC-II specification
• 6MV/m, 106.08MHz, Pfor200W
• Cavity 1 has an in-vacuum open circuit in the rf
  power feed
• 24 hour test at ISAC-II specifications completed
  successfully
• Refrigerator run in continuous feed cycle
• Frequency tuners effectively track rf frequency
  to maintain lock over a large pressure variation
  in the helium space
• Some noise problems with two of four rf amplifiers

24 hour
pressure
Tuner signals
13
Cavity Performance

• All cavities met specification
• Cavity 4 received a moderate rf conditioning
• X-ray levels similar to Nov. 2004 cold test
• Qo did not degrade during inactive period

14
Acceleration July 7

• Injected 26Mg6 from ISAC at 1.5MeV/u into SCB1
• Measured final energy with Si detector
• Achieved 3.5MV acceleration from three cavities
• Corresponds to average values of Ea7.4MV/m and
  Ep37MV/m
• One cavity not operational

15
Cavity Calibration

• Assume phi-25deg
• Three different gradient set-points used

VeffEaLTTF/TT0cos(phi)